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阶梯状滑移破裂作为节理斜坡的一种典型破坏模式,裂隙间裂纹的扩展模式对其变形破裂机制及斜坡破裂面形态具有重要的意义。通过颗粒流程序研究了不同岩桥倾角(0°,45°,90°,135°)和围压条件下双裂隙间裂纹的贯通模式、基本特征与影响因素,揭示含双裂隙岩体在不同围压作用下裂纹扩展的细观力学机制,并推广到含多裂隙岩体裂纹扩展模式中。主要成果如下:(1)双裂隙的贯通主要通过次生共面裂纹、次生倾斜裂纹和翼裂纹;(2)裂纹扩展具有明显的围压效应,低围压条件下,裂隙的贯通主要通过翼裂纹和次生倾斜裂纹,高围压条件下,裂隙的贯通主要通过次生共面裂纹和次生倾斜裂纹;(3)裂隙的贯通应力受岩桥倾角影响较大,岩桥倾角为45°时,裂隙的贯通应力最小,裂隙最容易贯通。结合双裂隙贯通模式的研究,对多裂隙岩体贯通模式进行研究,多裂隙岩体贯通模式可以理解为多组双裂隙的贯通模式的不同组合,同时,在多裂隙贯通模式中,裂纹会寻找贯通应力最小路径扩展。最后,结合一实际斜坡案例,对阶梯状破坏斜坡的基本破裂特征进行了总结分析,并提出了相应的破裂模式分区。
As a typical failure mode of the jointed slope, stepped slip failure is of great significance to the deformation and rupture mechanism and the shape of the rupture surface of the slope. Through the particle flow program, the penetration modes, basic characteristics and influencing factors of cracks between double cracks under different rock slope angles (0 °, 45 °, 90 °, 135 °) and confining pressure were studied. Meso-mechanics mechanism of crack propagation under confining pressure is extended to crack propagation model with multi-fractured rock mass. The main results are as follows: (1) The penetration of double fractures mainly through secondary coplanar cracks, secondary oblique cracks and wing cracks; (2) The crack propagation has obvious confining pressure effect. Under low confining pressure conditions, Wing cracks and secondary oblique cracks. Under the condition of high confining pressure, the fissures pass through secondary coplanar cracks and secondary inclined cracks. (3) The penetration stress of the fissures is greatly affected by the inclination of the rock bridge with the inclination angle of 45 °, the crack through the minimum stress, the most easy through cracks. Based on the study of double fracture mode, the study of multi-fracture rock mass penetration mode, multi-fracture rock mass penetration mode can be interpreted as different combinations of multiple groups of double fracture mode. At the same time, in multi-fracture mode, the crack will look for Through the minimum path of stress expansion. Finally, combined with an actual slope case, the basic rupture characteristics of stepped destructive slopes are summarized and the corresponding rupture pattern zoning is proposed.