彎曲元布置形式和注漿方法對(duì)MICP膠結(jié)砂土小應(yīng)變剪切模量的影響

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中圖分類號(hào)：TU441 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：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，“l(fā)ow 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

微生物誘導(dǎo)碳酸鈣沉淀（microbiallyinducedcarbonateprecipitation，簡(jiǎn)稱MICP）是一種新興的固化砂土方法，已經(jīng)成為土體加固領(lǐng)域中備受關(guān)注的技術(shù)之一。（剩余12908字）