摘要
研究岩石-岩石节理或混凝土-岩石接触面的力学行为,对于评价岩体的稳定性及工程体与岩基的稳定性有重要的意义。采用ANSYS有限元软件构建了在宽度方向一致的三维粗糙表面,模拟计算了Bandis等在玄武岩试件上的直剪试验结果,并将数值计算结果与试验结果对比,验证了ANSYS在分析两体剪切力学行为方面的可行性。此外对于有规则起伏的锯齿界面,同样进行了三维直剪试验的数值模拟,获到了不同界面和应力边界条件下的剪切强度,并与Patton剪胀公式理论值进行比较,从理论上再次验证了ANSYS模拟直剪试验的适用性。同时重点分析了直剪试验下的剪切位移曲线、接触面的剪应力分布、剪胀作用;并初步探讨了ANSYS软件自身设定凝聚力对接触面力学性能的影响。
It is important to research the mechanical behavior of the rock/rock and rock/concrete joints for the assessment of stability issues involving rock masses and engineering foundations.A finite element model of 3D rough surface unchanged in its width is established by employing ANSYS to simulate the direct shear test conducted by Bandis et al;then compared with the test results,some moderate well numerical results are acquired,which testified that it is feasible to apply ANSYS program to analyze the bi-body shear performance.In addition,several regular sawtooth interface computational models are used to examine the shear strength theoretical formula of Patton,consequently;it is proved again that using ANSYS to model the shear behavior is applicable.Furthermore,the evaluation of this paper focuses on the analysis of the shear stress-displacement curve,shear distribution on contact plane and dilatancy effect as well as cohesion effect.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第8期2149-2156,共8页
Rock and Soil Mechanics
基金
国家重点基础研究发展规划项目(No.2002CB412707)资助
关键词
粗糙表面
直剪试验
数值计算
剪切强度
剪切位移曲线
剪胀作用
rough surface
direct shear test
numerical calculation
shear strength
shear stress-displacement curve
dilatancy effect
