土木与环境工程学报（中英文）2025，Vol.47Issue(3)：41-48,8.DOI:10.11835/j.issn.2096-6717.2024.018
弯曲元布置形式和注浆方法对MICP胶结砂土小应变剪切模量的影响
Effects of bender element arrangement and grouting method on small strain shear modulus of MICP-cemented sand
摘要
Abstract
In geotechnical engineering,the small-strain shear modulus of sand Gmax is an important mechanical parameter.The isotropic consolidation tests were carried out on artificial glass sand,combined with multi-direction bender element tests.The effects of MICP reinforcement methods and bender element arrangement on Gmax of glass sand were investigated.The test results show that the development pattern of shear wave velocity VS,small strain stiffness Gmax and stiffness anisotropy GHH/GHV of glass sands reinforced by different methods are different.After MICP reinforcement,the Gmax of glass sand is increased.Among them,"low pH one-phase method+direct back pressure after injection of reaction solution"has the greatest Gmax increase,and the small-strain stiffness ratio(Gloadmax/Gunloadmax)has the maximum decrease.Due to the nonuniformity reinforcement,the placement height of bender element on the side wall also has a certain influence.Based on the test results in this study,it is recommended to arrange the HH and HV bender elements at the same plane to further discuss the effect of MICP on small strain stiffness anisotropy.Otherwise,the test error caused by reinforcement inhomogeneity can not be avoided.关键词
多方向弯曲元/小应变剪切模量/刚度各向异性/MICP加固/低pH一相法Key words
multidirectional bender element/small-strain shear modulus/stiffness anisotropy/MICP reinforcement/low pH one-phase method分类
土木建筑引用本文复制引用
张雷,郑延龙,徐涛,李浩玉,胡健,史金权..弯曲元布置形式和注浆方法对MICP胶结砂土小应变剪切模量的影响[J].土木与环境工程学报（中英文）,2025,47(3):41-48,8.基金项目
国家自然科学基金(52108301) National Natural Science Foundation of China(No.52108301) （52108301）
