水压致裂技术测试底板岩体张开型临界应力强度因子

基金项目:

煤炭科学研究总院青年创新基金资助(2003QN09)

详细信息

Research on measuring tensile critical stress intensity factor of floor rock by hydraulic fracturing technique

摘要: 利用断裂力学进行突水判别,必须求出临界应力强度因子。由于岩体结构复杂,很难获取符合临界应力强度因子测试的岩样。文中对水压致裂技术进行了断裂力学解释,建立了断裂力学模型,应用叠加原理推导了临界应力强度因子的计算公式。并应用这一结果,对葛店煤矿水压致裂测试底板原位地应力资料进行了分析,求得底板岩体的临界应力强度因子。
- 底板岩体 /
- 裂隙 /
- 水压致裂 /
- 断裂力学 /
- 临界应力强度因子
Abstract: If the inrush will occur it can be judged according to the fracture mechanics.But the value of the critical stress intensity factor must be measured firstly.Because of the complexity of the rock structure, the suitable rock sample is very difficult to obtain.In-situ stress measurements by hydraulic fracturing is explained according to the fracture mechanics theory,and the fracture mechanics model is set up.The computation equation of the critical stress intensity factor is deduced.The material of in-situ stress measurements by hydraulic fracturing in Gedian coal mine is analyzed applying the theory.The critical stress intensity factor is calculated applying the equation.
- floor rock /
- crevice /
- hydraulic fracturing /
- fracture mechanics /
- critical stress intensity factor