坚硬顶板岩层水力压裂可行性探究

Study on the feasibility of hydraulic fracturing for hard roof strata

为减轻采用爆破技术在坚硬顶板岩层强制放顶时对矿井安全高效生产的制约,以理论分析与数值模拟相结合的方法,开展了坚硬顶板岩层水力压裂的可行性分析。以榆神矿区某矿为研究对象,基于周向拉应力准则建立了裂缝前缘坐标系,并采用有限元软件ABAQUS进行了数值模拟分析。结果表明在水平孔沿应力方向逐渐变化的过程中,使裂缝张开的压力值保持不变;随着σh/σH的减小,裂缝开启所需压力均有增大趋势;随着σv/σH的减小,裂缝开启所需压力则有减小趋势。

In order to reduce the influence of forced caving by blasting technology on safe and efficient production in hard roof strata,the feasibility analysis of hydraulic fracturing of hard roof strata was carried out by combining theoretical analysis with numerical simulation.Taking a mine in Yushen mining area as the research object,the fracture front coordinate system was established based on the circumferential tensile stress criterion,and the finite element software ABAQUS was used for numerical simulation analysis.The results show that the pressure value of crack opening remains unchanged in the process of gradual change of the horizontal hole along the stress direction,the pressure value of crack opening increases with the decrease ofσh/σH,the pressure value of crack opening decreases with the decrease ofσv/σH.