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

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中图分类号：TU441 文献标志码：A 文章编号：2096-6717（2025）03-0041-08

Effects of bender element arrangement and grouting method on small strain shear modulusofMICP-cemented sand

ZHANG Lei'，ZHENG Yanlong²， x∪Tao3 ，LI Haoyu 1，4 ，HU Jian'， SHI Jinquan1

（1.SchoolofCivil Engineering，Chongqing University，Chongqing 400045，P.R.China；2.No.92493 Troopsof PLA，Huludaol250o，Liaoning，P.R.China；3.SchoolofTransportation，SoutheastUniversity，Nanjing 211892， P.R.China; 4.China Construction Southwest Consulting Co.，LTD，Chengdu 61o041，P.R. China）

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 glasssand，combined with multidirection bender element tests.The efects 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 smallstrain stiffness ratio （Gmaxload/Gmaxunload） has the maximum decrease. Due to the nonuniformity reinforcement， the placement height of bender elementon the side wallalso has acertain 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 effectof MICP on small strain stifness anisotropy. Otherwise，the test error caused by reinforcement inhomogeneity can not be avoided.

Keywords： multidirectional bender element；small-strain shear modulus；stiffess anisotropy；MICP reinforcement;low pH one-phase method

微生物诱导碳酸钙沉淀（microbiallyinducedcarbonateprecipitation，简称MICP）是一种新兴的固化砂土方法，已经成为土体加固领域中备受关注的技术之一。（剩余12908字）