碱渣土与结构接触面剪切力学特性试验研究

摘要

碱渣土可以作为大面积回填材料，但其理论研究相对落后于实践，利用改进的直剪仪，进行了碱渣土与三种不同粗糙程度结构界面的直剪试验。试验结果表明：作用在接触面上的法向应力和粗糙程度对接触面的剪切应力和力学响应影响很大；可以采用莫尔－库伦强度准则作为碱渣土与结构接触面的抗剪强度准则，粗糙度对接触面的内摩擦角影响较小，而对黏聚力影响较大。%Caustic Soil can be used as large-area backfill materials, but the theoretical study on interaction be-tween caustic soil and structure lags is behind the engineering application.The improved direct shear apparatus is applied to the direct shear experiment on the caustic soil and three interfaces of different roughness.The find-ings show that the normal stress on the interface and the roughness have great effect on the shearing stress of in-terface and mechanical response.Mohr-Coulomb strength criterion can be employed to the caustic soil and structure interfaces.The roughness has less effect on the angle of internal friction while it has greater effect on cohesion.