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学者姓名：李小军
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摘要 ：
Underground structures can significantly affect the ground motion and further influence the seismic design of aboveground structures around them. Although this issue has been well recognised and studied, it is not thoroughly addressed as a large number of factors are involved. This paper focuses on ground motion amplification induced by twin circular tunnels embedded in saturated poroelastic soil. The saturated poroelastic soil is modelled as a two-phase medium to consider parameters characterising the fluid phase. Three-dimensional scattering features of the twin tunnels for obliquely incident seismic waves are numerically investigated by a 2.5D finite element and boundary element hybrid model. It is shown that the presence of the twin tunnels can lead to significant modifications of the free-field motion, in terms of its magnitude and distribution. The threedimensional oblique incidence scenario presents a more general perspective on the ground motion amplification. Moreover, the effects of saturated poroelastic soil parameters on the ground motion amplification, including soil permeability, groundwater levels, and the degree of saturation, are parametrically investigated. The differences in ground motion amplification patterns between the saturated poroelastic and dry poroelastic soil scenarios are notable, highlighting the effects of parameters characterising the fluid phase.
关键词 ：
Degree of saturation Degree of saturation Soil permeability Soil permeability Twin tunnels Twin tunnels Obliquely incident seismic waves Obliquely incident seismic waves Ground motion amplification Ground motion amplification Groundwater level Groundwater level
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| GB/T 7714 | Zhu, Jun , Kontoe, Stavroula , Li, Xiaojun et al. Ground motion amplification by twin circular tunnels for obliquely incident seismic waves: Effects of saturated poroelastic soil parameters [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 186 . |
| MLA | Zhu, Jun et al. "Ground motion amplification by twin circular tunnels for obliquely incident seismic waves: Effects of saturated poroelastic soil parameters" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 186 (2024) . |
| APA | Zhu, Jun , Kontoe, Stavroula , Li, Xiaojun , Liang, Jianwen , Chen, Su . Ground motion amplification by twin circular tunnels for obliquely incident seismic waves: Effects of saturated poroelastic soil parameters . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 186 . |
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摘要 ：
Rapid and precise quantification of economic losses post -earthquake is critical for crafting informed disaster management strategies by governmental and insurance entities. This study introduces an ensemble model, constituted by Support Vector Machines (SVM) and Extreme Gradient Boosting (XGBoost), tailored for quick and interpretative prediction of GDP -related seismic loss assessments, with Sichuan Province serving as the empirical backdrop. The ensemble approach, pre -trained for expediency, draws on a knowledge -driven selection of 30 features that span seismic risks, socio-economic variables, and exposure factors. Enhanced by feature scaling and Bayesian hyperparameter optimization, the model's efficacy is validated through 6 metrics such as R -Squared, MSE, and MAE etc. The incorporation of SHAP values further unravels the model's decision -making, providing transparency to the often opaque computations of machine learning. This methodology offers a scalable, interpretable framework that equips stakeholders with timely and accurate insights for risk mitigation, ultimately strengthening earthquake resilience.
关键词 ：
Machine learning Machine learning Earthquake and socioeconomic interaction Earthquake and socioeconomic interaction Disaster management Disaster management Earthquake economic loss Earthquake economic loss
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| GB/T 7714 | Zhao, Jinpeng , Li, Xiaojun , Chen, Su et al. Multi-source driven estimation of earthquake economic losses: A comprehensive and interpretable ensemble machine learning model [J]. | INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION , 2024 , 106 . |
| MLA | Zhao, Jinpeng et al. "Multi-source driven estimation of earthquake economic losses: A comprehensive and interpretable ensemble machine learning model" . | INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION 106 (2024) . |
| APA | Zhao, Jinpeng , Li, Xiaojun , Chen, Su , Liu, Chen . Multi-source driven estimation of earthquake economic losses: A comprehensive and interpretable ensemble machine learning model . | INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION , 2024 , 106 . |
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摘要 ：
River valley terrain can lead to local amplification effects of site seismic responses and significant spatial variation of strong ground motions. This paper presented a semi-analytical solution for the scattering of incident plane P-waves by a saturated river valley with arbitrary shapes containing water, using the moment method and the wave function expansion method. The influence of factors such as valley geometry shapes, soil porosity, wave incident angle and frequency on the seismic response of valley topography is further investigated. Parameter analysis shows that these factors have a significant impact on the site seismic response. Soil porosity has a greater impact on the horizontal response of the site than on the vertical response. Moreover, the soil porosity is directly related to the amplitude of the pore pressure, while the incidence angle and frequency of the incident wave determine the distribution position of the pore pressure amplitude. This semi-analytical solution can be seen as an attempt to solve the scattering problem of incident P wave by saturated river valleys of arbitrary shapes containing water. The purpose of this paper is to provide a reference and a possible way for subsequent scholars to study the analytical solution to this problem. The conclusions drawn from the parameter analysis in this paper can also serve as a theoretical basis for seismic fortification in saturated valley areas.
关键词 ：
Seismic ground motion Seismic ground motion Amplification effect Amplification effect Seismic wave scattering Seismic wave scattering Moment method Moment method River valley River valley Saturated porous medium Saturated porous medium
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| GB/T 7714 | Jin, Liguo , Duan, Xueliang , Zhou, Zhenghua et al. A semi-analytical solution to incident plane P waves scattering by saturated river valley with arbitrary shapes containing water [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 179 . |
| MLA | Jin, Liguo et al. "A semi-analytical solution to incident plane P waves scattering by saturated river valley with arbitrary shapes containing water" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 179 (2024) . |
| APA | Jin, Liguo , Duan, Xueliang , Zhou, Zhenghua , Zhou, Bengang , Chen, Su , Li, Xiaojun . A semi-analytical solution to incident plane P waves scattering by saturated river valley with arbitrary shapes containing water . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 179 . |
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摘要 ：
本发明公开了一种土层三维速度结构的背景噪声水平竖向谱比联合反演方法，涉及浅层地震勘探领域，本发明基于散射场理论的背景噪声水平与竖向谱比方法进行单测点正演计算，在背景噪声的理论解释方面相比之前常用的单独体波解释和单独的面波解释更为全面和合理，能同时考虑土层背景噪声中的体波和面波的影响。本发明通过设立联合的目标函数，能实现对多个观测点的背景噪声观测记录进行同时反演，从而利用在一个区域范围内地表多个观测点同时获得的背景噪声记录反演获得土层的三维速度结构。本发明有效降低了一个区域范围内地下浅层速度结构探查的成本，可以广泛应用在钻孔或者地震测线难以施展的地区，大大节约了工程场地勘查的人力、物力、财力。
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| GB/T 7714 | 荣棉水 , 李小军 , 王继鑫 et al. 土层三维速度结构的背景噪声水平竖向谱比联合反演方法 : CN202311099465.2[P]. | 2023-08-30 . |
| MLA | 荣棉水 et al. "土层三维速度结构的背景噪声水平竖向谱比联合反演方法" : CN202311099465.2. | 2023-08-30 . |
| APA | 荣棉水 , 李小军 , 王继鑫 , 王畅 . 土层三维速度结构的背景噪声水平竖向谱比联合反演方法 : CN202311099465.2. | 2023-08-30 . |
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摘要 ：
本发明涉及砂土动力研究技术领域，具体地说是基于动骨架本构与饱和砂土孔压增长模型的土层时域积分方法，包括步骤为：确定基于动态骨架曲线且孔隙水压力的本构关系，建立能考虑孔压变化的时域积分方法，以及基于MATLAB编制计算程序，进行场地反应时域积分计算，同现有技术相比，本发明将砂土场地孔压发展模式与双曲线动态骨架曲线相结合，推导出一种可适用于砂土场地的应力‑应变关系式，并应用时域积分方法进行推导，得到可考虑砂土孔压的一维时域反应分析方法，基于matlab平台进行程序编写，得到SPODTD程序。
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| GB/T 7714 | 李小军 , 马睿 , 荣棉水 . 基于动骨架本构与饱和砂土孔压增长模型的土层时域积分方法 : CN202310661407.8[P]. | 2023-06-06 . |
| MLA | 李小军 et al. "基于动骨架本构与饱和砂土孔压增长模型的土层时域积分方法" : CN202310661407.8. | 2023-06-06 . |
| APA | 李小军 , 马睿 , 荣棉水 . 基于动骨架本构与饱和砂土孔压增长模型的土层时域积分方法 : CN202310661407.8. | 2023-06-06 . |
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摘要 ：
Seismic safety is a critical issue for liquefied natural gas (LNG) tanks. It is essential to investigate the effect of the isolation system on the seismic response of LNG tanks, considering dynamic soil-pile interaction, especially for tanks located in the deep soil site. This study aims to quantitatively evaluate the effects of isolation system (e.g., lead-core rubber bearings) on various aspects of a large LNG tank located on a deep soil site under horizontal bidirectional seismic action. Specifically, the evaluation includes outer tank acceleration, inner tank base shear, overturning moment, and pile force distribution. The findings demonstrate that the isolation system can effectively minimize the transfer of inertial interaction from the superstructure to the pile foundation, optimize the internal force distribution within the pile foundation, mitigate the pile group effect, and enhance the safety margin of the structure. Moreover, the isolation system can effectively suppress the transmission of seismic energy in medium and high frequencies, but amplify it in the low-frequency domain. Consequently, it is recommended that it is needed to avoid the site's natural frequency in the design of seismic isolation bearings for LNG tanks.
关键词 ：
Isolation system Isolation system Deep soil site Deep soil site LNG tank LNG tank Seismic response Seismic response LRB LRB Soil-pile interaction Soil-pile interaction
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| GB/T 7714 | Li, Zaixian , Zhang, Rui , Liu, Xiang et al. Analysis of seismic response of a large-scale isolated LNG tank considering dynamic soil-pile interaction [J]. | STRUCTURES , 2023 , 58 . |
| MLA | Li, Zaixian et al. "Analysis of seismic response of a large-scale isolated LNG tank considering dynamic soil-pile interaction" . | STRUCTURES 58 (2023) . |
| APA | Li, Zaixian , Zhang, Rui , Liu, Xiang , Chen, Su , Li, Xiaojun . Analysis of seismic response of a large-scale isolated LNG tank considering dynamic soil-pile interaction . | STRUCTURES , 2023 , 58 . |
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摘要 ：
Marine reinforced concrete constructions (suspended tunnels, undersea pipelines, and cross-sea bridges) are inherently at risk from underwater explosions due to the rising incidence of worldwide terrorism. Sea-crossing bridges are as an important land-sea connection channel, whose anti-explosion performance cannot be ignored. In this paper, the dynamic response and damage mechanism of piers of sea-crossing bridge under underwater explosion loads are studied by the arbitrary Lagrangian-Eulerian (ALE) method. Firstly, the correctness of the explosive load and reinforced concrete material models is verified by the Zamyshlyaev formula and underwater explosion test, respectively. Secondly, the finite element (FE) model of a pier under an underwater explosion load is established. Taking the residual vertical bearing capacity of the pier as the performance index, the damage evaluation method and four damage levels of the pier under explosion load are put forward. The study of different parameters such as explosive weight, explosion location, explosion height, and explosion distance shows that the damage to the pier is the most serious when the detonation point is directly below the projection of the pier cap. The residual bearing capacity of the pier falls exponentially as explosive weight increases. Different detonation heights have significant effects on the damage to the pier. Additionally, it is found using the explosion vulnerability analysis approach that the pier is very susceptible to collapse when the explosive weight is 350 kg.
关键词 ：
Underwater explosion Underwater explosion Anti-explosion performance Anti-explosion performance Explosive vulnerability Explosive vulnerability Bridge pier Bridge pier Damage assessment Damage assessment
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| GB/T 7714 | Zhou, Longyun , Li, Xiaojun , Yan, Qiushi . Dynamic response and vulnerability analysis of pier under near-field underwater explosion [J]. | ENGINEERING FAILURE ANALYSIS , 2023 , 155 . |
| MLA | Zhou, Longyun et al. "Dynamic response and vulnerability analysis of pier under near-field underwater explosion" . | ENGINEERING FAILURE ANALYSIS 155 (2023) . |
| APA | Zhou, Longyun , Li, Xiaojun , Yan, Qiushi . Dynamic response and vulnerability analysis of pier under near-field underwater explosion . | ENGINEERING FAILURE ANALYSIS , 2023 , 155 . |
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摘要 ：
Classification of engineering sites is essential when considering site conditions for seismic fortification in seismic design codes. However, because of different site classification methods, it is difficult for Chinese seismological and engineering communities to share site metadata (e.g., site classes) and relevant results with international communities. This issue also prevents the Chinese communities from utilizing well-established models based on the time-averaged shear wave velocity for the top 30 m (VS30). This study aims to close the gap and develop a consistent VS30-based site classification method. We first assemble the shear wave velocity (VS) profile data from various sites in China, Japan, and California to study the statistical characteristics of VS30 and the equivalent shear wave velocity (VSe, time-averaged within soil layers for & LE; 20 m, which is used in Chinese site classification). We then investigate the efficiency of site classification by VS30 and VSe alone, respectively. We find that the single VSe parameter is insufficient to distinguish different Chinese site classes, especially for site classes III and IV (which consider soil layers deeper than 20 m). In contrast, the VS30 parameter can effectively differentiate Chinese site classes from I0 to IV. A new VS30-based site classification method for Chinese sites is then developed. The boundaries of VS30 for each Chinese site class are determined by maximizing the rate of correctness. Our new VS30-based classification facilitates the connection of Chinese site classes with well-developed VS30-based models and site data sharing between Chinese and international scientific communities.
关键词 ：
Site classification Site classification Seismic fortification Seismic fortification Shear wave velocity Shear wave velocity V S30-based models V S30-based models Seismic design codes Seismic design codes
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| GB/T 7714 | Xie, Junju , Li, Kewei , Li, Xiaojun et al. VS30-based relationship for Chinese site classification [J]. | ENGINEERING GEOLOGY , 2023 , 324 . |
| MLA | Xie, Junju et al. "VS30-based relationship for Chinese site classification" . | ENGINEERING GEOLOGY 324 (2023) . |
| APA | Xie, Junju , Li, Kewei , Li, Xiaojun , An, Zhao , Wang, Pengfei . VS30-based relationship for Chinese site classification . | ENGINEERING GEOLOGY , 2023 , 324 . |
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摘要 ：
Based on strong motion and seismic velocity records from small-to-moderate earthquakes in the capital circle region of China, we developed a new ground motion prediction model (GMPM) that incorporates magnitude, geometric attenuation, anelastic attenuation, and linear/nonlinear site response terms. The GMPM was subjected to evaluation through residual analysis. We compared the median predictions of the GMPM with those of two commonly used local GMPMs, as well as the observed ground motions in this region. Furthermore, we conducted an investigation into the differences between the GMPM and four NGA-West2 models. Additionally, we explored certain model parameters that could potentially explain these differences. The results indicate that the GMPM effectively captures the magnitude-dependent attenuation and nonlinear average effect of soil sites. The GMPM demonstrates the capability to predict horizontal peak ground acceleration (PGA), peak ground velocity (PGV), and spectral acceleration (SA (T = 0.01-3.0 s)). The model is applicable for surface wave magnitudes (MS = 3.1-5.1), hypocentral distances (Rhyp = 10-200 km), and VS30 = 103-1070 m/s in the capital circle region of China. There are significant differences in anelastic attenuation at rock sites between southern California and the capital circle region of China. These differences decrease with increasing periods and largely diminish in far sources and soil sites. This is primarily because the effect of anelastic attenuation is neutralized by the greater site amplification of ground motion in southern California, especially over medium and long periods. The difference in ground motion observed in small-to-moderate earthquakes across different regions is predominantly influ-enced by long-distance attenuation and dissimilarities in site responses.
关键词 ：
Seismic velocity record Seismic velocity record Capital circle region of China Capital circle region of China Regional difference in ground motion Regional difference in ground motion Strong motion record Strong motion record GMPM GMPM
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| GB/T 7714 | Zhang, Bin , Li, Xiaojun , Yu, Yanxiang et al. A new ground-motion model to predict horizontal PGA, PGV, and spectral acceleration for small-to-moderate earthquakes in the capital circle region of China [J]. | JOURNAL OF ASIAN EARTH SCIENCES , 2023 , 257 . |
| MLA | Zhang, Bin et al. "A new ground-motion model to predict horizontal PGA, PGV, and spectral acceleration for small-to-moderate earthquakes in the capital circle region of China" . | JOURNAL OF ASIAN EARTH SCIENCES 257 (2023) . |
| APA | Zhang, Bin , Li, Xiaojun , Yu, Yanxiang , Sun, Jize , Rong, Mianshui , Chen, Su . A new ground-motion model to predict horizontal PGA, PGV, and spectral acceleration for small-to-moderate earthquakes in the capital circle region of China . | JOURNAL OF ASIAN EARTH SCIENCES , 2023 , 257 . |
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摘要 ：
In order to examine the effect of spatial scale and building exposure distribution on the pure rate of earthquake catastrophe insurance, this study described three modules for rate determination, put forward the general assumptions and principles for calculating the pure insurance rate, and introduced three types of building distribution and their calculation. Taking Tangshan City of Hebei Province in China as an example, we analyzed the pure rate of regional earthquake insurance in terms of spatial scale and building exposure distribution by using the method of control variables. The results show that for districts (or counties) with large differences in seismic risk, the risk areas can be further divided to apply differential rates. In areas with a diverse distribution of potential earthquake source areas and large differences in building density, there is a risk of overestimating or underestimating the pure rate of earthquake insurance when buildings are distributed evenly or partially evenly. This violates the break-even principle of rate setting. This study also provides a reference for earthquake catastrophe insurance companies to choose the spatial scale and the detailed level of exposure distribution in rate determination.
关键词 ：
Catastrophe insurance Catastrophe insurance China China Earthquake exposure Earthquake exposure Premium rate Premium rate Spatial scale Spatial scale Tangshan Tangshan
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| GB/T 7714 | Zhang, Pan , Li, Xiaojun , Liu, Chen . Impact of Spatial Scale and Building Exposure Distribution on Earthquake Insurance Rates: A Case Study in Tangshan, China [J]. | INTERNATIONAL JOURNAL OF DISASTER RISK SCIENCE , 2023 , 14 (1) : 64-78 . |
| MLA | Zhang, Pan et al. "Impact of Spatial Scale and Building Exposure Distribution on Earthquake Insurance Rates: A Case Study in Tangshan, China" . | INTERNATIONAL JOURNAL OF DISASTER RISK SCIENCE 14 . 1 (2023) : 64-78 . |
| APA | Zhang, Pan , Li, Xiaojun , Liu, Chen . Impact of Spatial Scale and Building Exposure Distribution on Earthquake Insurance Rates: A Case Study in Tangshan, China . | INTERNATIONAL JOURNAL OF DISASTER RISK SCIENCE , 2023 , 14 (1) , 64-78 . |
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