Laboratory experiment study of grouted materials filled in karst caverns
LIU Qi1，2，CHEN Weizhong1，3，YUAN Jingqiang1，ZHANG Qingyan1，RONG Chi1，WANG Songqing4，ZHAO Liantao5
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，
China；4. China Coal Mine Construction Group Corporation Ltd.，Wuhan，Hubei 430200，China；
5. Yankuang Group Company Limited，Zoucheng，Shandong 273500，China)
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.
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2019, Vol. 38 
