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学者姓名：龚秋明
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摘要 ：
The modified rock mass classification system for TBM tunnels and tunneling was proposed to assess rock mass quality, rock mass boreability, and TBM construction suitability. However, the section concerning the impact of adverse geological conditions on TBM utilization was not yet finalized. In this study, the classification system was upgraded to the stressed hard rock tunnels by adding the coefficient. A database comprising 551 instances of rockbursts and their corresponding TBM performance data was compiled from the Yinhan Water Conveyance Tunnel in China. The characteristics of rockbursts occurring in the tunnel excavated by TBM and their formation mechanisms were introduced. The depth of damage to the tunnel wall was used as the assessment index for the intensity grade of rockbursts. Quantitative relationships were established between the intensity grade of rockbursts and TBM performance parameters for the first time. As the intensity grade of rockbursts increased, there was a substantial reduction in TBM utilization, while the penetration rate exhibited no significant changes. The reduction coefficient beta A for TBM utilization at the rockburst intensity grades, namely minor damage, moderate damage, and severe damage, was determined to be 0.88, 0.60, and 0.39 respectively. These coefficients were subsequently integrated into the classification system. Finally, a simple case was presented to illustrate the applicability of the rockburst reduction coefficient beta A and the upgraded system.
关键词 ：
Rock mass classification Rock mass classification Rockburst Rockburst Reduction coefficient Reduction coefficient TBM performance TBM performance
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| GB/T 7714 | Lu, Jianwei , Gong, Qiuming , Wei, Junzheng et al. Determination of rockburst reduction coefficient βA in the modified rock mass classification system for TBM tunnels and tunneling [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2024 , 174 . |
| MLA | Lu, Jianwei et al. "Determination of rockburst reduction coefficient βA in the modified rock mass classification system for TBM tunnels and tunneling" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 174 (2024) . |
| APA | Lu, Jianwei , Gong, Qiuming , Wei, Junzheng , Han, Bei , Yin, Lijun . Determination of rockburst reduction coefficient βA in the modified rock mass classification system for TBM tunnels and tunneling . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2024 , 174 . |
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摘要 ：
The advance rate of a tunnel boring machine (TBM) excavating in high-strength rock masses is limited. Creating kerfs on the working face using pure high-pressure water jets (HPWJ) is a feasible way to improve TBM performance. However, the influence of the cracks created by HPWJ on the subsequent cutter indentation has not been investigated. To get a comprehensive understanding of the rock breakage mechanism within the TBM cutter indentation assisted with HPWJ, a full factorial granite kerfing experiment was conducted, the depth and width of the kerfs produced by HPWJ with various jet pressures and nozzle traverse speeds were measured. Indentation tests including different cutter indentation positions and various shapes of kerfs created by HPWJ were performed, the indentation force and acoustic emission rate were continuously monitored. Finally, typical kerfing samples and indentation samples were sectioned to observe the internal rock fracture pattern using fluorescent dye. The kerfing test results indicated the granite kerfing mechanism by HPWJ consisted of the grain erosion and the dynamic impingement. A new index of unit loading energy (Eu) of HPWJ was proposed, which was the energy input into the rock as the jet traversed a unit distance of the nozzle diameter. The influence of Eu on the kerf shape and inner cracks pattern was analyzed. The indentation test results indicated a shallow wide kerf with less cracks produced by HPWJ using a low Eu could drastically reduce the high indentation force if the cutter loaded on the kerf. However, a deep narrow kerf with long inner cracks created by HPWJ using a high Eu could facilitate the crack expansion during the cutter indentation if the kerf was arranged on the side of the cutter. In this case, a critical spacing between the kerf and cutter existed, below which the rock chip could be created with the lower indentation force, and the critical spacing increased with the increasing Eu. This study is conducive to a rational cutterhead design of TBM assisted by HPWJ. The fracture mechanism of granite kerfed by high-pressure water jet is revealed.A new index of unit loading energy of HPWJ is established and its influence on the fracture pattern is analyzed.The influence of the shape of kerfs along with the macro-cracks created by HPWJ on the subsequent cutter indentation is studied.
关键词 ：
Crack propagation Crack propagation Rock fracture pattern Rock fracture pattern TBM cutter indentation TBM cutter indentation High-pressure water jet High-pressure water jet
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| GB/T 7714 | Xu, Hongyi , Gong, Qiuming , Ma, Yanan et al. Rock Fracture Pattern Kerfed by HPWJ and its Influence on TBM Cutter Indentation in Granite [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2024 , 57 (7) : 5047-5066 . |
| MLA | Xu, Hongyi et al. "Rock Fracture Pattern Kerfed by HPWJ and its Influence on TBM Cutter Indentation in Granite" . | ROCK MECHANICS AND ROCK ENGINEERING 57 . 7 (2024) : 5047-5066 . |
| APA | Xu, Hongyi , Gong, Qiuming , Ma, Yanan , Zhou, Xiaoxiong , Han, Bei . Rock Fracture Pattern Kerfed by HPWJ and its Influence on TBM Cutter Indentation in Granite . | ROCK MECHANICS AND ROCK ENGINEERING , 2024 , 57 (7) , 5047-5066 . |
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摘要 ：
A tunnel boring machine (TBM) generates rock chips during excavation, which are crucial for assessing surrounding rock integrity, enhancing excavation efficiency, and evaluating cutter wear. However, traditional methods struggle to identify small rock chips, chips submerged in soil or water, and chips in stacked states. This paper proposes a convolutional neural network (CNN)-based method for directly recognizing the particle size distribution from rock chip images. A dataset of 2520 rock chip images representing 84 particle-size distributions was collected in a laboratory environment. By comparing various CNN architectures and hyperparameters, an optimal model was obtained with a mean absolute error (MAE) of 1.66 x 10-2 and R2 of 0.923 on the test set. The results demonstrate that the proposed method enables the real-time recognition of particle size distribution using rock chip images, which has the potential to significantly improve intelligent auxiliary excavation technology in TBMs.
关键词 ：
CNN CNN Feature visualization method Feature visualization method Deep learning Deep learning Gradation of rock chips Gradation of rock chips Image recognition Image recognition Lightweight model Lightweight model
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| GB/T 7714 | Peng, Yuan-en , Li, Xu , Dong, Zi-kai et al. Convolutional neural network-based model for recognizing TBM rock chip gradation [J]. | AUTOMATION IN CONSTRUCTION , 2024 , 163 . |
| MLA | Peng, Yuan-en et al. "Convolutional neural network-based model for recognizing TBM rock chip gradation" . | AUTOMATION IN CONSTRUCTION 163 (2024) . |
| APA | Peng, Yuan-en , Li, Xu , Dong, Zi-kai , Gong, Qiu-ming . Convolutional neural network-based model for recognizing TBM rock chip gradation . | AUTOMATION IN CONSTRUCTION , 2024 , 163 . |
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摘要 ：
本申请提出了一种试验针磨损测量装置及岩石磨蚀性指数试验系统，该试验针磨损测量装置包括夹持单元、视觉采集单元和驱动单元，夹持单元用于夹持试验针沿第一方向设置，试验针包括相连接的主体部和针尖部；驱动单元用于驱动夹持单元转动，以使夹持单元带动试验针转动；视觉采集单元与夹持单元沿第二方向相对设置，视觉采集单元用于拍摄外露于夹持单元的针尖部，并识别得到针尖部的磨损参数。本申请提出的试验针磨损测量装置测量速度快、精确度高。
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| GB/T 7714 | 龚秋明 , 张然 , 殷丽君 et al. 试验针磨损测量装置及岩石磨蚀性指数试验系统 : CN202210103468.8[P]. | 2022-01-27 . |
| MLA | 龚秋明 et al. "试验针磨损测量装置及岩石磨蚀性指数试验系统" : CN202210103468.8. | 2022-01-27 . |
| APA | 龚秋明 , 张然 , 殷丽君 , 陈东坡 , 张同钢 , 刘永强 et al. 试验针磨损测量装置及岩石磨蚀性指数试验系统 : CN202210103468.8. | 2022-01-27 . |
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摘要 ：
In most cases, TBM tunnels are constructed in jointed rock masses. Rock chip properties can be used to interpret the response of the rock mass to the TBM tunnelling. Engineering-scale simulations can help us to explain the relationship between rock chip properties and rock mass conditions. In this study, a GPU-based DICE2D programme is presented to meet the computation requirements of the engineering-scale simulation. The smooth joint model (SJM) was also incorporated into DICE2D via an improved joint side checking approach. Using the SJM-embedded DICE2D, a multiple-cutter penetration model was set up. The combined influence of joint spacing and angle on the rock breaking process and rock chip properties were analysed. Further, a rock chip extraction algorithm was proposed to quantify the shape and size distribution. The results showed that in the rock masses with the close joint spacing, the smaller the alpha angle, the blockier the rock chips were. As the joint spacing increase, the rock chips become flat. Both the joint spacing and alpha angle affected the size distribution. The overall size of rock chips decreased with the increasing joint spacing, and first increased with the increasing alpha angle and then decreased when the alpha angle was over 60 degrees. The very closely jointed rock mass at the alpha angle of 90 degrees was an exception because rock slabs would be produced. In addition, in the jointed rock mass with the joint spacing less than 250 mm and 60 degrees-75 degrees alpha angle, or in the highly jointed rock masses with 90 degrees alpha angle, significant differences between the forces acting on the different cutters were revealed.
关键词 ：
Rock breaking mechanism Rock breaking mechanism Jointed rock mass Jointed rock mass Tunnel boring machine Tunnel boring machine DICE2D DICE2D Rock chip Rock chip
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| GB/T 7714 | Zhou, Xiaoxiong , Gong, Qiuming , Liu, Xiaoli et al. Rock Chip Properties of TBM Penetration in Jointed Rock Masses Based on an Improved DICE2D Simulation [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2022 , 55 (12) : 7547-7568 . |
| MLA | Zhou, Xiaoxiong et al. "Rock Chip Properties of TBM Penetration in Jointed Rock Masses Based on an Improved DICE2D Simulation" . | ROCK MECHANICS AND ROCK ENGINEERING 55 . 12 (2022) : 7547-7568 . |
| APA | Zhou, Xiaoxiong , Gong, Qiuming , Liu, Xiaoli , Xu, Hongyi , Yin, Lijun . Rock Chip Properties of TBM Penetration in Jointed Rock Masses Based on an Improved DICE2D Simulation . | ROCK MECHANICS AND ROCK ENGINEERING , 2022 , 55 (12) , 7547-7568 . |
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摘要 ：
隧道施工中,岩石的磨蚀性是影响各类破岩工具磨损的主要因素之一.国际上设计了许多评价岩石磨蚀性的小型试验,其中Cerchar试验因其操作简易性获得了普遍应用,其结果CAI(Cerchar Abrasivity Index)值能够较好地预测破岩工具连续、平稳的正常磨损,目前我国也广泛采用该试验进行岩石磨蚀性评价.由于我国引进该试验时间较晚,尚无国家试验规范,CAI值的等级划分不明确.本文收集了国际上各试验室与机构使用的分级标准,从CAI值分级所用的钢针硬度、CAI值对应的破岩工具磨损量、大量试验数据的分布3个方面综合比较,认为国际岩石力学协会推荐的CAI值分级比较合理.本文对国内Cerchar试验规范创立、岩石磨蚀性评价具有借鉴意义.
关键词 ：
CAI分级 CAI分级 磨蚀性试验 磨蚀性试验 工具磨损 工具磨损
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| GB/T 7714 | 龚秋明 , 许弘毅 , 李立民 . 岩石磨蚀性指数分级讨论 [J]. | 地下空间与工程学报 , 2021 , 17 (3) : 748-758 . |
| MLA | 龚秋明 et al. "岩石磨蚀性指数分级讨论" . | 地下空间与工程学报 17 . 3 (2021) : 748-758 . |
| APA | 龚秋明 , 许弘毅 , 李立民 . 岩石磨蚀性指数分级讨论 . | 地下空间与工程学报 , 2021 , 17 (3) , 748-758 . |
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摘要 ：
盾构隧道施工刀盘状态实时监测系统研制
关键词 ：
刀盘状态 刀盘状态 实时监测系统 实时监测系统 滚刀磨损 滚刀磨损 滚刀转速 滚刀转速 盾构机 盾构机
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| GB/T 7714 | 龚秋明 , 王庆欢 , 王杜娟 et al. 盾构隧道施工刀盘状态实时监测系统研制 [J]. | 龚秋明 , 2021 , 58 (2) : 41-50 . |
| MLA | 龚秋明 et al. "盾构隧道施工刀盘状态实时监测系统研制" . | 龚秋明 58 . 2 (2021) : 41-50 . |
| APA | 龚秋明 , 王庆欢 , 王杜娟 , 邱海峰 , 吴帆 , 现代隧道技术 . 盾构隧道施工刀盘状态实时监测系统研制 . | 龚秋明 , 2021 , 58 (2) , 41-50 . |
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摘要 ：
下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究
关键词 ：
卵石地层 卵石地层 地表沉降 地表沉降 既有隧道 既有隧道 模型试验 模型试验 盾构下穿 盾构下穿 隧道变形 隧道变形
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| GB/T 7714 | 路德春 , 雷春明 , 李晓强 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 [J]. | 路德春 , 2021 , 47 (4) : 328-337 . |
| MLA | 路德春 et al. "下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究" . | 路德春 47 . 4 (2021) : 328-337 . |
| APA | 路德春 , 雷春明 , 李晓强 , 苗金波 , 龚秋明 , 杜修力 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 . | 路德春 , 2021 , 47 (4) , 328-337 . |
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摘要 ：
The initial stress of the surrounding rock mass will be redistributed during TBM tunneling in a deep tunnel. This process may induce brittle failure of the surrounding rock mass, which has a great impact on TBM construction. The southern section of the Yinhan Water Conveyance Tunnel is mainly composed of massive to intact granite, with a maximum overburden depth of nearly 2000 m. The paper discussed in detail the relationship between various brittle failure degrees at the typical tunnel faces and TBM performance. The typical patterns, such as undamaged, slabbing, and strain rockburst at the tunnel face, and the corresponding characteristics of the TBM performance parameters were revealed. As the severity of damage increases, the rock mass boreability is improved, the cutterhead thrust is reduced, and the penetration increases, but there is an upper limit. It is noteworthy that the field penetration index (FPI) fluctuation expressed by the coefficient of variation (CV) varies significantly in different stress states. Based on the excavation response of TBM, a Rockburst Warning Index (RWI) was proposed to assess the brittle failure degree of the excavated rock mass in real-time. The results of the study can provide some insights into the prediction of TBM performance and the early warning of rockburst in deep-buried hard rock grounds.
关键词 ：
Brittle failure Brittle failure TBM performance TBM performance In-situ stress In-situ stress Rockburst warning index (RWI) Rockburst warning index (RWI) Hard rock Hard rock
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| GB/T 7714 | Lu, Jianwei , Gong, Qiuming , Yin, Lijun et al. Study on the tunneling response of TBM in stressed granite rock mass in Yinhan Water Conveyance tunnel [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2021 , 118 . |
| MLA | Lu, Jianwei et al. "Study on the tunneling response of TBM in stressed granite rock mass in Yinhan Water Conveyance tunnel" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 118 (2021) . |
| APA | Lu, Jianwei , Gong, Qiuming , Yin, Lijun , Zhou, Xiaoxiong . Study on the tunneling response of TBM in stressed granite rock mass in Yinhan Water Conveyance tunnel . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2021 , 118 . |
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摘要 ：
砂土地层流动性较大,是典型的力学不稳定地层.土压平衡盾构在砂土地层条件下施工时,容易出现刀盘、刀具等异常磨损、刀盘扭矩和推力增大、开挖面失稳崩塌、喷涌等问题.基于此,文章以石家庄地铁1号线2期某区间砂土地层土压平衡盾构施工为例,首先进行室内渣土改良剂试验、坍落度试验和搅拌试验,而后将试验成果应用于施工现场,并对土体改良后的施工数据进行了分析.结果表明:泡沫浓度为6％、泥浆浓度为16％时改良剂性能较好,满足盾构施工要求;泥浆注入比为8％、泡沫注入比为60％是最佳改良方案,此时坍落度在100～200 mm范围内,搅拌扭矩小,且波动幅度低;在一定范围内,随泡沫注入比的增加,掘进时的扭矩切深指数、螺旋机扭矩、土舱土压波动等都会减小,有利于盾构施工,但泡沫注入不宜过量.
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| GB/T 7714 | 王磊磊 , 殷丽君 , 龚秋明 et al. 石家庄砂土地层土压平衡盾构渣土改良试验研究 [J]. | 现代隧道技术 , 2021 , 58 (3) : 182-189 . |
| MLA | 王磊磊 et al. "石家庄砂土地层土压平衡盾构渣土改良试验研究" . | 现代隧道技术 58 . 3 (2021) : 182-189 . |
| APA | 王磊磊 , 殷丽君 , 龚秋明 , 李瑞 , 吴帆 , 班超 . 石家庄砂土地层土压平衡盾构渣土改良试验研究 . | 现代隧道技术 , 2021 , 58 (3) , 182-189 . |
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