高应力下土与结构接触面剪切特性的试验研究

Experimental study of shear characters in the interface between soil and structure in high stress

高应力下土与结构接触面剪切特性的研究是当前井壁破裂理论研究的关键之一 ,本文对高应力作用下的实验仪器和实验过程做了简要的介绍 .通过实验数据的分析可知 :高应力下土与砼块、金属材料接触面的 τ-ws关系 ,当法向应力≤ 4MPa时 ,可用理想弹 -塑性模型来模拟 ,当法向应力大于 4MPa时 ,可用三直线段来表示 ;接触面剪切特性的峰值强度与残余强度相差不大 ;峰值强度的大小与法向应力和剪切位移有关 ;当法向应力较大时 ,残余强度随基底刚度的增大而增大 .最后 ,对实验模型应用于工程设计提出了需注意的因素 .

The shear character in the interface between soil and structure in high stress is one of key research in shaft lining fracture theory.It has briefly introduced the experimental apparatus and process.By analyzing experimental data,the shear character of interface [AKτ-D]-w s correlation can be described by ideal elastic?plastic model when normal stress ≤4?MPa or be described by three line segment model when normal stress >4?MPa,and the apical intensity and residual intensity is about the same,and the apical intensity is related to normal stress and shear displacment.The residual intensity got higher along with the base rigidity accretion when normal stress is biggish.Finally,influenced factors are put forward on experimental model applying to engineering project.