岩溶充填黏土注浆加固试验研究

doi:10.13722/j.cnki.jrme.2018.1438

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摘要岩溶充填黏土失稳是岩溶隧道突水突泥灾害主要类型之一，为研究注浆对岩溶充填黏土的加固机制与效果，自行研制一套室内注浆试验系统。该试验系统主要由围压加载系统、数据采集系统、注浆模块以及压力室模块构成，具备模拟真实地层应力状态、渗流环境的功能。利用此试验系统模拟岩溶腔体真实赋存环境，开展充填黏土在不同初始密实度、注浆压力下的注浆试验，并对注浆加固试样进行力学、渗透特性试验。结果表明：(1) 试样密实程度影响启裂压力，当试样孔隙度由37.5%减小到35.5%时，启裂压力由0.49 MPa增长到1.22 MPa，注浆压力小于启裂压力时，浆液主要以挤密形式进入土体，当注浆压力超过启裂压力，土体进入劈裂注浆阶段；(2) 浆液加固形式与扩散半径主要受注浆压力与注浆量控制，试样应力状态决定劈裂注浆扩展方向；(3) 注浆通过对土颗粒的挤密、劈裂、化学胶结及压滤作用，使黏聚力与渗透系数明显改善，注浆终压达到3.5 MPa时，试样黏聚力较注浆前平均提高84.26%，渗透系数平均下降93.97%；(4) 注浆在加固土体的同时，也改变内部原有结构，随着注浆终压的增大，注浆量的增加，土体应力–应变曲线逐渐表现出应变软化特点。试验结论对岩溶充填黏土注浆加固机制的认识及现场注浆工作有一定借鉴意义。

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	刘奇1
	2
	陈卫忠1
	3
	袁敬强1
	张庆艳1
	荣驰1
	王松青4
	赵连涛5

关键词 ：土力学, 突水突泥, 充填黏土, 试验研究, 注浆机制, 加固效果

Abstract：Water and mud inrush disasters induced by filling material instability occurs frequently in karst area，in order to study the mechanism of grouting for clay filled in the karst caverns，a laboratory experiment system，consisting of pressure confining system，data acquisition system，cement grouting module and pressure chamber were designed，which could simulate the real stress condition and seepage environment. With this experiment system，grouting experiments were carried out to study the influences of clay sample density and cement pressure for the grouting process，Shear and penetration tests were implemented on soil samples before and after grouted. The test results show that：(1) the grouting form changes from compacting into fracturing with the grouting pressure surpassing the splitting pressure，which increases from 0.49 MPa to 1.22 MPa when samples? porosity decrease from 37.5% to 35.5%；(2) The grouting fracturing channels reach further and start forming fracture networks with the grouting pressure increasing constantly，and the fracturing direction is controlled by samples? stress state；(3) Strength and permeability parameters are reinforced significantly after grouting，cohesion values up by 84.26%，permeability coefficient decreases by 93.97%；(4) the grouting process also changed samples? original internal structure，which makes their shear-displacement curves acquire more strain-softening characteristics. The research results have a guiding significance for the understanding and evaluation of grouting effect for clay filled in the karst caverns.

Key words： soil mechanics water and mud inrush material filled in karst caverns experiment research grouting mechanism reinforcement effectiveness

引用本文:

刘奇1，2，陈卫忠1，3，袁敬强1，张庆艳1，荣驰1，王松青4，赵连涛5. 岩溶充填黏土注浆加固试验研究[J]. 岩石力学与工程学报, 2019, 38(S1): 3179-3188.
LIU Qi1，2，CHEN Weizhong1，3，YUAN Jingqiang1，ZHANG Qingyan1，RONG Chi1，WANG Songqing4，ZHAO Liantao5. Laboratory experiment study of grouted materials filled in karst caverns. , 2019, 38(S1): 3179-3188.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1438 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/3179

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