矿山岩体压裂控制及裂隙渗流与应力关系分析

Analysis on Fracturing Control and Relationships between Fissure Seepage and Stress for Mine Rock Mass

为开发矿山地热能,在利用矿山开采过程中自然涌出热水的基础上,提出了压裂矿山热岩石,利用裂隙渗流特性用冷水吸收热岩体能量的方法。通过对岩体开裂力学模型的进一步推导,得出岩块稳定开裂的条件;对失稳状态下裂缝压力进行分析,得到垂直裂缝压力和水平裂缝压力;通过实验,明确裂隙渗透率与静应力的关系;建立了三维裂隙在三向应力作用下的渗透系数及渗流量模型,求得岩体应力对渗透系数及渗流量的影响作用。

For the purpose of developing mine geothermal energy and utilizing the hot water gushing naturally in mining process,we propose a method of fracturing the hot rock of mine and absorbing the energy of hot rock by cold water based on the fissure seepage characteristics.The conditions of rock cracking stably are found through further derivation of rock cracking mechanics model.The vertical and horizontal fracture pressures are gained according to the analysis of crack pressure under unstable state.The relationships between fissure permeability and static stress are clarified by experiment.We establish the permeability coefficient and seepage model of 3D fissure under 3D stress to know how the stress of rock mass affects the permeability coefficient and seepage.