Flow-Slip Stability Behavior of Calcareous Sand Treated by Microbially Induced Carbonate Precipitation Technology

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外文摘要：Flow-slip damage commonly destabilizes coastal slopes.Finding a slope stabilization method for calcareous sands in the South China Sea is crucial.Microbially induced calcite precipitation is a promising,eco-friendly method for soil stabilization.This study investigates the effect of microbial treatments,initial relative density,initial cell pressure,and initial stress ratio on the flow-slip stability of calcareous sand specimens by using constant shear drained tests.These tests lay the foundation to study the mechanical instability of sand slopes.Results show that the microbial-treated specimens maintain stable stresses longer,take longer to reach the instability,and withstand larger volumetric strains.Microbial treatment effectively enhances sand stability under constant shear drainage,with im-provements amplified by higher initial relative density and initial cell pressure.In addition,a smaller initial stress ratio reduces shear effects on the specimen and increases resistance to flow slides.Microanalysis reveals that the flow-slip stability of calcareous sand slopes is enhanced by contact cementation,particle coating,void filling,and mutual embedment of calcium carbonate crystals.

外文关键词：

clcareous sandmicrobially induced carbonate precipitationconstant shear drained testsflow-slip stability

作者：

KOU Hailei、HE Xiang、HOU Wangxiang、LI Zhendong、ZHANG Xixin、AN Zhaotun、LU Jiaqing

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作者单位：

College of Engineering,Ocean University of China,Qingdao 266404,China

基金：

Taishan Scholars Program of Shandong Province,ChinaNational Natural Science Foundations of ChinaShandong Provincial Key Research and Development Plan,China

项目编号：

tsqn202306098521712822021ZLGX04

出版年：

2024

DOI：

10.1007/s11802-024-5953-x

中国海洋大学学报(自然科学英文版)

中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD

影响因子：0.268

ISSN：1672-5182

年,卷(期)：2024.23(5)

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