基于弯曲元试验的微生物注浆过程中剪切波速测定  

Measurement of Shear Wave Velocity During Microbial Grouting Based on Bender Element Tests

作　　者：韩智光 郑俊强 HAN Zhiguang;ZHENG Junqiang(School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,China;School of Life Sciences,Henan University,Kaifeng 475004,China)

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]河南大学生命科学学院,河南开封475004

出　　处：《工业建筑》2024年第9期51-56,共6页Industrial Construction

基　　金：国家自然科学基金面上项目(42177454)。

摘　　要：微生物加固可液化砂土的效果,受注浆过程中细菌体积、传输速率、孔隙再分布等因素的影响。且在实际应用过程中因试件制备造成其内部质量、密度等差异,导致难以科学判断试样内部微生物的具体成矿效果,严重影响其现场应用。过往的微生物加固试验研究多为单元尺度,而砂柱尺度应用较少。因此,在砂柱(长度0.5 m)上,通过自行研制的多点弯曲元多通道实时剪切波速测量装置,在微生物注浆过程中进行多位点实时监测,分段表达试件中微生物的成矿效果,藉此系统研究试件内部微生物诱导碳酸钙沉淀(MICP)的实时成矿规律。The improving effect of liquefiable sand strengthened by microbes was influenced by bacterial volumes and transfer rates of slurry in the grouting,redistribution of pores,and etc.Due to differences of internal qualities,densities and other factors caused by preparation for specimens in actual application,it was difficult to scientifically judge the mineralization effect in specimens,thereby,the application of the microbial induced carbonate precipitation(MICP)technique in sites was restricted.The existing experimental study on microbial induced carbonate precipitation was in unit scales,rarely in sand column scales.Therefore,multi-point and real-time monitoring was conducted on sand columns(in a length of 0.5 m)in the process of microbial grouting with the self-developed multi-point and multi-channel measurement device of bender elements for shear wave velocity,and the mineralization effect of microorganisms in specimens was expressed in stages.It was verified that the multi-point shear wave velocity measurement device could be explored the real-time MICP mineralization situation in specimens.

关 键 词：MICP 砂柱 剪切波速 弯曲元 多通道监测系统 

分 类 号：TU41[建筑科学—岩土工程]