断续节理岩体劈裂破坏的贯通机理研究  

STUDY ON COALESCENCE MECHANISM OF SPLITTING FAILURE OF ROCK MASSES WITH INTERMITTENT JOINTS UNDER COMPRESSION

作　　者：周小平[1] 张永兴[1] 王建华[2] 朱可善[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]上海交通大学建筑工程与力学学院,上海200030

出　　处：《岩石力学与工程学报》2005年第1期8-12,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(59879012);国家"十五"科技攻关项目(2001BA604A02);三峡工程开发总公司科研资助项目(CT–02–07–16)

摘　　要：利用裂纹孤立原理结合裂纹线场理论,研究了压应力作用下断续节理线尖端的精确弹性区应力场和脆断区应力场,然后将精确弹性区应力场和脆断区应力场相匹配,进而确定脆断区长度和荷载之间的关系。利用脆断区长度和荷载之间的关系,从理论上分析了断续节理产生劈裂破坏的贯通机理,并且确定了断续节理岩体发生劈裂破坏的强度。通过和实验结果对比分析,论证了理论模型的正确性和可行性。It is of great significance to study the coalescence mechanism of splitting failure of rock masses with intermittent joints under compression. On the basis of the crack isolating theory combined with the near crack line analysis method, the exact elastic stress field near the crack line is analyzed. The relation between the length of plastic zone along the crack line and external load is established by the matching condition of the elastoplastic fields on the boundary. The coalescence stress and the strength properties of rock masses are determined. The solution is a function of the geometry of the crack array. The results show that the coalescence stress and the strength of crack-weakened rock masses depend on the friction coefficient of crack interface, sliding crack spacing, orientation of cracks, and the half-length of crack. Experimental validations are given to illustrate the applicability of the proposed model.

关 键 词：岩石力学 压应力 断续节理岩体 劈裂破坏 

分 类 号：TU452[建筑科学—岩土工程]