海水环境下微生物诱导碳酸钙沉淀胶结散体状强风化花岗岩崩解试验研究  

Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment

作　　者：林文彬 王彬 高玉朋 柯劲涛 曹生根 孔秋平 LIN Wenbin;WANG Bin;GAO Yupeng;KE Jintao;CAO Shenggen;KONG Qiuping(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Institute of Earth Sciences and Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian Yonking Construction Geotechnical Co.,Ltd.,Longyan 364000,China)

机构地区：[1]福建理工大学福建省土木工程新技术与信息化重点实验室,福州350118 [2]福建理工大学地球科学与工程研究所,福州350118 [3]福建永强岩土股份有限公司,福建龙岩364000

出　　处：《工业建筑》2024年第9期1-9,共9页Industrial Construction

基　　金：国家自然科学基金项目(42202015);福建省科技计划项目(2023Y3008);国家级大学生创新创业训练计划项目(202310388027,202310388030)。

摘　　要：采用微生物诱导碳酸钙沉淀(MICP)注浆技术加固散体状强风化花岗岩,并分析胶结液溶剂、胶结液浓度和注浆次数等因素在海水环境下对MICP胶结强风化花岗岩试样物理力学性能和崩解特性的影响。结果表明:当海水作为胶结液溶剂时,试样加固效果好于淡水试样,其无侧限抗压强度、碳酸钙含量、干密度和抗崩解性能均高于用淡水作为胶结液溶剂的试样。随着胶结液浓度的增大,试样的无侧限抗压强度、碳酸钙含量、干密度呈现先增加后降低的趋势,而试样的最终崩解率呈现先降低后增加的趋势,海水和淡水试样的最优胶结液浓度均为0.75 mol/L。在最优胶结液浓度下,加固试样的无侧限抗压强度、碳酸钙含量和干密度随注浆次数的增加而增大,而最终崩解率则逐渐降低;4次灌浆后,海水试样最高无侧限抗压强度可达9.38 MPa,崩解率仅为1.5%。The Microbially Induced Calcite Precipitation(MICP)grouting technique was conducted to cement strongly weathered granular granite,and the influence on physical and mechanical properties and disintegration characteristics of specimens after being cemented with different cementing solvents,cementitious concentrations,and rounds of grouting cycles in the seawater environment was analyzed.The results showed the physical and mechanical properties and disintegration resistance of the strongly weathered granular granite were distinctly improved after being cured by MICP;meanwhile,when seawater was used as cementing solvents,the cementitious effect for specimens was better than that in freshwater,and its unconfined compressive strength,calcium carbonate content,dry density and disintegration resistance were higher than those in freshwater.In addition,with the increase in the cementitions concentration,unconfined compressive strength,calcium carbonate content and dry density of specimens tended to first increasing and then decreasing,simultaneously,the final disintegration ratios of specimens tended to first decreasing and then increasing.The optimum cementitious concentration was 0.75 mol/L.The calcium carbonate content and unconfined compressive strength of cured specimens increased with the increase in rounds of grouting cycles and the final disintegration ratios were gradually decreased in the optimum cementitious concentration solution;the maximum value of unconfined compressive strength of specimens after 4 rounds of grouting cycles was up to 9.38 MPa,and the disintegration ratio was only 1.5%.

关 键 词：散体状强风化花岗岩 微生物诱导碳酸钙沉淀 胶结 崩解率 碳酸钙含量 

分 类 号：TU45[建筑科学—岩土工程]