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假设非均质岩体微元的弹性模量和抗压强度均服从Weibull分布,用愈渗理论推导了非均质岩体的水射流破坏准则和水射流破碎非均质岩体的门槛压力;数值模拟了水射流在非均质煤层中的连续钻孔过程;并进行了水射流的破煤实验.研究表明,在水射流作用下,煤岩体中强度较弱的一系列微元首先破坏,形成裂隙.进入裂隙空间的水射流对裂隙发生的水楔作用,使裂隙尖端产生拉应力集中,导致裂隙迅速发展和扩大,裂隙与裂隙连通后使得大块的煤岩体脱落,形成破碎坑.当水射流压力为60 MPa时,煤体破碎距离达到0.5 m以上.
Assuming that the elastic modulus and compressive strength of the heterogeneous rock mass are all subject to the Weibull distribution, the water jet failure criterion of heterogeneous rock mass and the threshold pressure of water jet fractured heterogeneous rock mass are deduced by the more percolation theory. Numerical simulation of the continuous drilling process of water jet in heterogeneous coal seam was carried out and coal-water experiments of water jet were carried out.The results show that a series of micro-elements with weak strength in coal and rock body are firstly destroyed under water jet effect , Forming a fissure.Water jet into the fissure space effect on the cleavage wedge, so that the tensile stress generated at the tip of the fissure, resulting in the rapid development and expansion of the fracture, the fissure and the fissure connectivity makes large coal and rock body off, the formation of crushing pit When the water jet pressure is 60 MPa, the crushing distance of coal reaches more than 0.5 m.