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中文摘要：
在研究渗透水压和远场应力共同作用下压剪滑移型岩石裂纹的起裂、扩展规律的基础上，考虑分支裂纹相互作用，建立压剪应力场和渗流场共同作用下岩石裂纹体的损伤断裂力学模型和考虑岩桥损伤所引起的附加应力强度因子演化方程，提出分支裂纹临界长度时裂纹尖端虚拟应力强度因子K1（LC）、作为压剪岩石裂纹的损伤断裂贯通的破坏准则。研究结果表明：在既定裂纹分布下，分支裂纹尖端应力强度因子K1受侧压力系数λ、渗透压p、裂纹表面摩擦因数μ的制约：当轴向应力和裂纹面摩擦因数一定时，在低渗透压、侧向拉应力共同作用下，压剪岩石裂纹趋向于轴向贯穿破坏，而在高渗透压作用下会导致分支裂纹尖端岩桥剪切破坏。
英文摘要：
Through studying the cracking and propagation regulations of compressive-shear rock cracks under the jointed action of saturated pressure and remote stress field, considering the interaction with growing cracks in population, a damage fracture mechanics model of rock cracks under jointed action of compressive-shear stress field and seepage field was developed. The evolutive equations of additional stress intensity factor at the branch crack cusp were also obtained considering rock bridge damage. The damage fracture failure criterion was set up in which the suppositional stress intensity factor K1（LC） at the branch crack cusp was researched as an index when branch crack propagation length reached critical length. The results show that saturated pressurep, the ratio of the principal stress λ and friction coefficient μ have influence on the stress intensity factor K1 at the branch crack cusp. The damage fracture failure criterion is feasible Under certain axial stress and friction coefficient states, the low saturated pressure and lateral tensile stress lead to axis coalescence, and the high saturated pressure leads to bridge shear failure coalescence.
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