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《Subgrade Engineering》 2014-06
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Study on Mechanical Property of Biaxial Compression in Rhyolite and the Failure Mechanism

Li Jia;Deng Ronggui;School of Civil Engineering,Southwest Jiaotong University;  
After tunnel or slope is excavated,the rock at some positions on the boundary is in the state of biaxial compression approximately. The rhyolite specimens from Nibashan Tunnel, on which biaxial compression test was conducted,showed obvious fragility,but some ones for biaxial test under high lateral pressure present certain plasticity. The biaxial compressive strength of the specimens is represented by a process of first increase then decrease; however,it was found that the lateral pressure has unremarkable effect on elastic modulus E,but significant influence on deformation modulus E50; under the condition of biaxial compression,as the lateral constraint increases,the number of rupture surface in the specimen failure reduced,which changes from the multiple rupture surfaces of plate cracking to single rupture surface. The correlation between DP3 failure criteria and the test result is good and capable of being applied to the research on the rhyolite's strength properties under biaxial condition.
【Fund】: 国家自然科学基金:裂隙性隧道围岩滞后性破裂及涌水突泥机理研究(41272321)
【CateGory Index】: TU45
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