摘要
节理剪切扩容效应意指节理在剪切过程中,由于节理面的起伏不平引起节理体积和厚度增加的作用。在垂直节理方向上,节理常常受具有一定刚度的围岩,锚杆和锚索等约束。剪切扩容和刚度约束造成作用在节理表面正应力的增加,从而大大增加了节理的剪切强度。在模型研究,剪切扩容试验和结果分析基础上,编写了节理剪切扩容效应的有限元程序,并以某水电站地下厂房为例,说明它对洞室稳定和变形的作用。
The Shear Dilatant Effect of Joints Refers to the Increase of Joints' Volume and Thickness Accompanying Shear Displacement as Caused by the Asperity of the Joint Surface. A Joint is Often Restrained on Both Sides by Surrounding Rockmass, Bolts and Cables of Certain Rigidity, Both the Shear Dilatant Effect and the Rigidity Restraint Lead to the Increase of the Normal Stess Acting on the Joint Surface and Shear Strength of Joints are thus Increased Considerably.Based on the Study of the Model, Test of Shear Dilatancy, and Analysis of Testing Results, the FE Program of Shear Dilatant Effect of Joints has been Worked out and the Underground Electric Plant in Ertan Hydroelectric Power Station is taken as an Example to Illustrate its Function to Stability and Deformation.Through Studying its Geological Cause and Formation, Analysing the Results of Shear Test in Situ, Observing and Surveying the Asperity behaviors on Joint Surface, it is shown that the Shear Dilatancy is a Widesproad behavior for Unfilled oints.
出处
《水文地质工程地质》
CAS
1988年第5期8-13,共6页
Hydrogeology & Engineering Geology