构造煤分层对煤单轴压缩力学特性影响的颗粒流模拟

为了研究构造煤分层对煤的力学特性影响程度，采用颗粒流数值模拟方法研究不同赋存参数的构造煤分层对煤的单轴压缩力学特性的影响规律，从受荷后的裂纹分布和试样破坏形式2个方面分析试样压缩过程中细观力学响应机制。研究结果表明:构造煤分层厚度和倾角是影响煤的单轴压缩力学特性的重要参数，其中倾角主要影响内部裂纹的类型和分布，构造煤厚度主要影响煤的单轴抗压强度；单轴压缩下煤的破坏类型主要包括沿交界面的层裂破坏、拉伸破坏和复合破坏3种类型，构造煤分层倾角较小时，更容易由于构造煤挤出效应导致的失去承载能力，随倾角增大，挤出效应减弱，单轴抗压强度有增大趋势。

Particle flow simulation on influence of tectonic coal stratification on uniaxial compression mechanical properties of coal

Abstract: In order to study the influence of tectonic coal stratification on the mechanical properties of coal，the influence laws of tectonic coal stratification with different occurrence parameters on the uniaxial compression mechanical properties of coal were studied by using the numerical simulation method of particle flow,and the microscopic mechanical response mechanism of the samples during the compression process was analyzed from two aspects of cracks distribution and failure mode of samples under loading.The results showed that the thickness and dip angle of tectonic coal stratification were the important parameters affecting the uniaxial compression mechanical properties of coal,among which the dip angle mainly affected the type and distribution of internal cracks,and the thickness of tectonic coal mainly affected the uniaxial compressive strength of coal.The failure types of coal under the uniaxial compression mainly included three types,namely the spalling failure,tensile failure and composite failure along the interface.When the dip angle of tectonic coal stratification was small,it was easier to lose the bearing capacity due to the extrusion effect of tectonic coal.As the dip angle increased,the extrusion effect weakened,and the uniaxial compressive strength tended to increase.