【摘要】 引入分形几何理论,应用分形方法来描述岩石断裂裂纹的曲折形态,进而建立分形裂纹下的岩石断裂韧性理论模型。在此基础上,应用自主研制的内压法岩样断裂韧性测试系统对不同假设条件下的岩石断裂韧性进行测定。结果表明,分形裂纹模型测试得到的岩石断裂韧性大于直线模型的断裂韧性,这也从理论上证实了目前水力压裂作业中理论计算值常低于施工压力的结论,说明应用该文的模型计算结果更接近实际情况。更多还原

【Abstract】 The fractal methods are used to describe the tortuous shape of rock fracture cracks,and the theoretical models for fracture toughness of rock with fractal cracks are built.Based on these and different assumptions,the rock fracture toughness has been determined with rock fracture toughness testing system,which is self-developed and has the internal pressure.The results show that the fracture toughness of rock with fractal cracks is greater than that obtained by linear model,which also confirms that the theoretical values are often lower than the actual pressures of hydraulic fracturing operations at present.It is further proved that the calculation results with this model are closer to the actual ones.更多还原