微生物灌浆对广东花岗岩残积土强度影响的试验研究  

Experimental Research on Microbial Grouting Effect on Strength of Granite Residual Soil in Guangdong

作　　者：毛强[1] 呙锴 杜鉴航 肖广宁 张江伟 郭红仙[2] 程晓辉[2] MAO Qiang;GUO Kai;DU Jianhang;XIAO Guangning;ZHANG Jiangwei;GUO Hongxian;CHENG Xiaohui(CSG EHV Power Transmission Company,Guangzhou 510700,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]中国南方电网超高压输电公司电力科研院,广州510700 [2]清华大学土木工程系,北京100084 [3]河北地质大学,石家庄050031

出　　处：《工业建筑》2024年第9期26-31,共6页Industrial Construction

摘　　要：针对广东花岗岩残积土地区输电塔处边坡在强降雨作用下易发生滑坡的问题,展开微生物诱导碳酸钙沉积技术(MICP)改善花岗岩残积土力学性能的研究。对取自肇庆和清远两地的花岗岩残积土(平均粒径d_(50)分别为0.179、1.547 mm)进行了MICP灌浆及力学性能试验测试。结果表明:两种花岗岩残积土都被成功胶结,两种土因粒径大小及组成不同,胶结效果也不同,单轴无侧限抗压强度分别达到2.74、3.36 MPa,三轴压缩试验结果表明黏聚力均显著提升。Be aimed at the issue that granite residual soil slopes are prone to landslide in heavy rainfall in Guangdong,the use of microbial induced calcium carbonate precipitation technique to improve the mechanical properties of granite residual soil was performed.The specimens of granite residual soil with a average particle diameter of 0.179 mm and 1.547 mm respectively,taken from Zhaoqing and Qingyuan in Guangdong,were grounted by MICP and tested their mechanisal properties before and after being grouted.The results showed that both types of granite residual soil had been successfully cemented,and the particle sizes and composition of soil influenced the cemented effect by MICP.Their uniaxial unconfined compressive strength reached 2.74 MPa and 3.36 MPa respectively.Triaxial compression tests were also conducted,and the test result indicated that the cohesion of specimens from both sites were improved.

关 键 词：微生物诱导碳酸钙沉积技术 花岗岩残积土 三轴压缩试验 微生物灌浆 

分 类 号：TU41[建筑科学—岩土工程]