岩石压剪裂纹水力劈裂分析及裂纹面方向计算  

Analysis on Tension-Shear Complex Fracture under Rock Stress and the Calculation of Fracture Direction

作　　者：汪魁[1] 赵明阶[1] 

机构地区：[1]重庆交通大学河海学院,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2010年第3期441-444,共4页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：水力劈裂技术在岩土工程中应用越来越广泛,但自然界中的水力劈裂可能会引发地质灾害,因此,水力劈裂机理研究已成为岩土工程中的热点问题。通过利用断裂力学理论对水力劈裂时裂纹的扩展问题进行研究,推导了基于最大周向应力理论的裂纹起裂角及临界水压的计算公式,分析了压剪复合断裂时临界水压力与裂纹面方向之间的关系,在此基础上得出了压剪断裂时最易于发生水力劈裂的裂纹面位置。The application of the hydraulic fracturing technique is more and more extensive in geotechnical engineering,but hydraulic fracturing may cause some geology disasters.Therefore,the mechanism of the hydraulic fracturing is a hot topic in geotechnical engineering.The fracture propagation is studied through the principles of the fracture mechanics,the computation formula of the cracking angle of fracture and the critical internal water pressure based on the maximum circumferential stress criterion are deduced.Then,the relation between the critical internal water pressure and the direction of the fracture are analyzed in detail;meanwhile,the fracture location where the hydraulic fracturing is mostly inclined to occur under the tension-shear complex model is obtained.

关 键 词：水力劈裂 最大周向应力 压剪裂纹 临界水压 

分 类 号：TU452[建筑科学—岩土工程]