max</sub> 是重要的力學(xué)參數(shù)。以人工玻璃砂替代天然砂土材料，結(jié)合多方向彎曲元測(cè)量進(jìn)行MICP加固玻璃砂各向同性固結(jié)排水試驗(yàn)，探究MICP加固方法、彎曲元布置形式對(duì)玻璃砂水平面( G<sub>HH</sub>) 和垂直平面( G<sub>HV</sub> 和 G<sub>VH</sub> )上剪切模量的影響。結(jié)果表明：不同方法加固玻璃砂的剪切波速 V<sub>s</sub>. 小應(yīng)變剛度 G<sub>max</sub> 和剛度各向異性 G<sub>HH</sub>/G<sub>HV</sub> 發(fā)展規(guī)律不同。經(jīng)MICP加固后，玻璃砂的 G<sub>max</sub> 均有提高，其中，“低pH一相法 + 注入反應(yīng)液后直接反壓”，G<sub>max</sub> 提升最大，小應(yīng)變剛度比( G<sub>max</sub><sup>unload</sup>/G<sub>max</sub><sup>load</sup> )下降幅度最大。由于加固的不均勻性，彎曲元在側(cè)壁上的布置高度也有一定的影響。在探討MICP對(duì)小應(yīng)變剛度各向異性的影響時(shí)，應(yīng)在同一水平面布置HH和HV方向的彎曲元傳感器，否則，加固不均勻性將引起較大試驗(yàn)誤差。-龍?jiān)雌诳W(wǎng)" />

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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）

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