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应用真实破裂过程分析系统软件RFPA2D2.0-Flow,采用细观方法表达岩石材料非均匀特性,建立了渗流-应力-损伤耦合模型;模拟分析了裂隙岩体在具有不同角度、不同长度、天然裂隙中点与井孔之间不同间距的单一天然裂隙条件下的水压致裂过程;通过对模型内拉伸裂缝萌生及扩展的描述,得出了天然裂隙角度、长度、天然裂隙中点与井孔的间距对裂隙岩体内水力裂纹的扩展及与天然裂隙相交模式的影响趋势。模拟分析结果表明:天然裂隙角度对模型稳定性影响较小,但对裂纹扩展模式的影响较大;天然裂隙与井孔间距的减小使模型的失稳水压值随着裂隙角度的增加而逐渐增大,但最大值与间距未减小时基本相同;随着天然裂隙长度的增加,模型的承载能力逐渐减弱,且减弱的幅度逐渐增大。
The real fracture analysis software RFPA2D2.0-Flow is applied to describe the non-uniform characteristics of rock materials by using the mesoscopic method. A coupled model of seepage-stress-damage is established. The fractured rock mass is simulated and analyzed with different angles, different lengths, The mid-point and the hole between the different natural fractures under a single natural hydraulic fracturing process; through the description of model initiation and propagation of tensile cracks, obtained the natural fracture angle, length, natural fracture midpoint and well Influence of hole spacing on the expansion of hydraulic cracks in the fractured rock mass and the mode of intersection with natural fractures. The simulation results show that the natural fracture angle has little effect on the stability of the model but has a great influence on the crack propagation mode. The decrease of the spacing between the natural fracture and the borehole causes the model instability pressure value to increase with the increase of the fracture angle But the maximum value is basically the same as that when the distance is not reduced. With the increase of the natural fracture length, the carrying capacity of the model gradually decreases and the decreasing amplitude increases gradually.