摘要
微生物加固砂土地基存在加固不均匀的问题,采用自主研发的多通道电阻率测量技术对微生物加固钙质砂地基的电阻率分布规律开展了试验研究,研究了菌液和反应液在注入土体后对电阻率幅值及变化规律的影响,最后根据电阻率分布情况,探讨了微生物加固钙质砂地基空间上加固程度的差异性,以及利用电阻率法监测微生物加固过程和加固效果的可行性。试验结果表明:微生物加固钙质砂地基的电阻率受土体密度,菌液与反应液影响较大,其中,反应液对电阻率的影响程度最高。整体上电阻率随着加固次数的增加呈现先增大后减小的规律,深部土体电阻率显著低于上部土体,第七至第八次加固后,土体电阻率开始增加,这一现象的原因可能为土体中的孔隙在多次加固后逐渐被生成的碳酸钙填充,土体中的离子交换通道减少导致电阻率增加,此时碳酸钙填充孔隙对电阻率的影响占主导地位。
The heterogeneity is a technical problem for MICP-reinforced foundation.The electricity resistivity of a MICP-treated calcareous sand foundation is experimentally studied using the selft-developed multichannel measurement equipments.The effects of bacterial solution and cementation solution on the amplitude and variation law of electricity resistivity are investigated.The spatial differences of the MICP treatment effects in the calcareous foundation and the feasibility of using the electricity resistivity to monitor the MICP reaction process are discussed.The test results show that the electricity resistivity of the calcareous foundation is affected by the density,bacterial solution and cementation solution,among which the effects of cementation solution are the most significant.The electricity resistivity firstly increases,then decreases with the increase of MICP treatment times.The deeper soil has lower electricity resistivity than the upper soil.The electricity resistivity increases after the seventh or the eighth treatment.The reason for this phenomenon may be that the pores in the soil are gradually filled by the generated calcium carbonate after the repeated reinforcement,and the ion exchange channels in the soil are reduced,leading to an increase in the resistivity.The influences of calcium carbonate-filled pores on the resistivity are dominant at this time.
作者
史金权
王磊
张轩铭
赵航
吴秉阳
赵航行
刘汉龙
肖杨
SHI Jinquan;WANG Lei;ZHANG Xuanming;ZHAO Hang;WU Bingyang;ZHAO Hanghang;LIU Hanlong;XIAO Yang(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas(Chongqing),Chongqing 400045,China;Audit Office of Quanzhou,Quanzhou 362000,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2024年第2期244-253,共10页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金青年基金项目(52108301)
国家自然科学基金重点项目(41831282)
国家自然科学基金优秀青年项目(51922024)。
关键词
微生物诱导碳酸钙沉淀
电阻率
钙质砂
菌液
反应液
MICP
electricity resistivity
calcareous sand
bacterial solution
cementation solution
