不均匀及不连续结构面抗剪强度模拟试验研究  

Simulation experiment on shear strength of unevenand discontinuous structural planes

作　　者：司富安[1] 贾国臣[2] 高玉生[2] 高义军[2] 鞠占斌[1] 

机构地区：[1]水利部水利水电规划设计总院,北京100120 [2]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《水利水电技术》2010年第2期75-79,共5页Water Resources and Hydropower Engineering

基　　金：水利部公益性科研项目(200701043)

摘　　要：在不同类型结构面与岩桥组合的大型剪切试验和不同比例岩桥与夹泥层组合的中型剪切试验基础上,对比分析了试验结果与常用的面积加权法计算值之间的关系,探讨了试验过程中应力、应变的变化规律和特征。结果表明,大型剪切试验值一般小于峰值面积加权计算值,而中型剪切试验的摩擦系数接近或小于计算值,粘聚力的试验值大于计算值,且岩桥位置不同对试验结果有一定影响。就剪切变形破坏特征而言,常常是前块首先变形,当变形达到一定量值后中块开始变形,然后是后块变形,直至破坏。当岩桥所占面积比例较小且剪应力较低时,夹泥层变形多大于岩桥变形;剪应力高或岩桥所占面积比例较大,则二者变形相近。岩桥剪切破坏面的特征与岩桥所占比例有关,岩桥所占面积比例较小的试件,岩桥在夹泥附近被直接剪断;岩桥所占面积比例较大的试件,岩桥破坏面为锯齿状,与剪应力方向形成约45°夹角。Based on data from the large scale shear tests on various combinations of structural planes with rock bridges and the medium scale shear tests on the combination of the rock bridges of various scales with muddy intercalations, the relationship between the test result and the calculated values from the conventional area weighted method is comparatively analyzed, and then the stress and strain changing law and characteristics during the test is discussed as well. The result shows that the value from the large scale shear test is generally less than the peak value from the weighted calculation, while the coefficient from the medium scale shear test is close to or less than that from the calculation and the testing value of the cohesions is larger than the calculated one. Furthermore, the location of the rock bridge has a certain influence on the testing result concerned.

关 键 词：不均匀结构面 不连续结构面 面积加权 模型试验 

分 类 号：TV32[水利工程—水工结构工程]