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为了分析裂隙水压力对裂隙煤岩体的结构改造效应及宏观力学性能的影响,在现场调研煤岩体原生节理裂隙分布形态的基础上,采用断裂力学分析了岩体内水压裂隙起裂的最小水压力和分支裂纹的扩展后长度.从能量的角度分析了岩体内原生裂隙及水压分支裂纹扩展产生的应变能.在岩块为各向同性的前提下给出了裂隙扩展前后岩体的总柔度,从能量耗散损伤的角度以柔度为损伤变量分析了裂隙水压力与岩体损伤的关系.实例分析表明裂隙水压力对裂隙煤岩体宏观力学性能的弱化效果明显.图2,参12.
In order to analyze the effect of fissure water pressure on the structural reforming effect and macroscopic mechanical property of fractured coal and rock mass, on the basis of on-site investigation of the distribution patterns of primary jointed fractures in coal and rock mass, the fracture mechanics was used to analyze the fracture initiation of hydraulic fractures The minimum water pressure and the extended length of the branch crack, the strain energy produced by the original crack in the rock mass and the crack propagation in the hydraulic branch is analyzed from the energy point of view. The rock mass before and after the crack expansion is given on the premise that the rock mass is isotropic The total flexibility of the body is analyzed, and the relationship between the water pressure and the rock mass damage is analyzed based on the softness as the damage variable from the point of view of the energy dissipation damage.Example analysis shows that the weakening effect of the fracture water pressure on the macroscopic mechanical properties of the fractured coal and rock mass is obvious. Figure 2, 参 参 12.