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作者:

Gao, Zhiwei (Gao, Zhiwei.) | Cai, Hongjian (Cai, Hongjian.) | Hong, Yi (Hong, Yi.) | Lu, Dechun (Lu, Dechun.)

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EI Scopus SCIE

摘要:

Fine-grained marine sediments often contain gas bubbles that can cause many geotechnical problems. This soil has a composite structure with gas bubbles fitting within the saturated soil matrix. The gas cavity has a detrimental effect on the soil stiffness and strength when they are filled with undissolved gas only. The gas cavity can be filled with gas and pore water due to "bubble flooding". Bubble flooding has a beneficial effect on the soil stiffness and undrained shear strength because it makes the saturated soil matrix partially drained under a globally undrained condition. A critical state constitutive model for gassy clay is presented that accounts for the composite structure of the soil and bubble flooding. The gas cavity is assumed to have a detrimental effect on the plastic hardening of the saturated soil matrix. Some of the bubbles can be flooded by pore water from the saturated soil matrix, which leads to higher mean effective stress of the saturated soil matrix. Consequently, both soil stiffness and strength increase. Only one new parameter is introduced to model the detrimental effect of gas bubbles on plastic hardening. The model has been validated by the results of three gassy days.

关键词:

pore pressure constitutive model critical state gassy clay undrained shear strength

作者机构:

  • [ 1 ] [Gao, Zhiwei]Univ Glasgow, James Watt Sch Engn, Glasgow G12 8QQ, Lanark, Scotland
  • [ 2 ] [Cai, Hongjian]Univ Glasgow, James Watt Sch Engn, Glasgow G12 8QQ, Lanark, Scotland
  • [ 3 ] [Hong, Yi]Zhejiang Univ, Coll Civil Engn & Architecture, Key Lab Offshore Geotech & Mat Zhejiang Prov, Hangzhou 310058, Peoples R China
  • [ 4 ] [Lu, Dechun]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China

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来源 :

CANADIAN GEOTECHNICAL JOURNAL

ISSN: 0008-3674

年份: 2021

3 . 6 0 0

JCR@2022

ESI学科: ENGINEERING;

ESI高被引阀值:87

JCR分区:2

被引次数:

WoS核心集被引频次: 2

SCOPUS被引频次: 5

ESI高被引论文在榜: 0 展开所有

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