考虑剪切变形历史影响的节理峰值剪切强度准则  

New peak shear strength criterion with inclusion of shear action history

作　　者：张建明[1] 刘泉声[1] 唐志成[1] 占婷 蒋亚龙[1] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《山东大学学报（工学版）》2015年第5期77-81,共5页Journal of Shandong University（Engineering Science）

基　　金：国家重点基础研究发展计划(973)资助项目(2014CB046904);国家自然科学基金青年基金资助项目(41402247)

摘　　要：采用人工模拟材料制备节理试件,分别在0.5、1.0、2.0、3.0 MPa法向应力下进行直剪试验,每级法向应力下剪切4次,模拟剪切变形历史对剪切强度的影响。试验结果表明:峰值强度随剪切次数的增加逐步减少,第1次直剪试验得到的峰值剪切强度与第2次直剪试验得到的峰值剪切强度差异最明显,之后随剪切次数的增加,峰值剪切强度变化较少。通过分析不同法向应力下节理的剪胀特征及峰值剪切强度的变化,建立了考虑剪切变形历史(以剪切次序表达)影响的峰值剪切强度准则。Artificial joints were used for direct shear tests under four levels of normal stresses,i. e. 0. 5,1. 0,2. 0 and3. 0 MPa,to simulate the effect of shear deformation history. The results showed that peak strength decreased with the shear times increasing. In addition,the discrepancy between the result of direct shear test for the first time and for the second time was the most obvious. With shear times increasing,there were few er changes of peak shear strength in follow ing tests. Analyzing dilatancy characteristics and changes of peak shear strength under normal stresses,the peak shear strength criterion considering the effect of shear deformation history was established.

关 键 词：岩石节理 剪切强度 剪切历史 

分 类 号：TU43[建筑科学—岩土工程]