摘要
通过在DRS— 1型微机高压直残剪试验系统上所进行的直接剪切试验研究表明 :高应力作用下砂-砂、砂 -钢的抗剪峰值强度与正应力、残余强度与正应力之间的关系 ,符合库伦强度准则 ;高应力作用下砂 -砂的剪切特性呈现出硬化现象 ,砂 -钢的剪切特性随法向应力的大小呈现出软化或硬化现象。基底对砂土的抗剪峰值强度准则影响稍小 ,但对抗剪残余强度准则影响稍大 ,界面峰值抗剪强度准则的选择与法向应力的大小有关 ,法向应力较低时剪切破坏发生在界面上 ,法向应力较高时剪切破坏发生在砂土中。
The Shear experiment using DSR-1 type computer high pressure shear system has been conducted in the paper,the result shows:under high pressure,the relationship between the positive stress and the peak shear strength of the sand-sand and the sand-steel,as well as the relationship between the positive stress and the residual shear strength are accord well with Mohr-Column strength criteria;still under high pressure,the shear character of the sand-sand shows hardening phenomenon,and that of the sand-steel shows softening or hardening phenomenon as the value of positive stress.The base has a slightly weak influence on the peak shear strength criteria ,but has a slightly strong influence on the residual shear strength criteria.The selection of interface′s peak shear strength criteria has a relation with the value of normal stress,when the normal stress is low,the shear failure happens in the interface,and when the normal stress is high,the shear failure happens in the sand soil.
出处
《煤》
2002年第6期6-8,共3页
Coal
