层状结构顶板锚杆组合拱梁支护机理

对层状结构顶板锚杆支护机理应用离散元模拟、物理模拟方法开展研究，表明锚杆支护回采巷道层状结构顶板形成组合拱梁结构，锚杆支护机理相应称为组合拱梁作用。物理模拟表明组合拱梁纵向载荷、横向载荷与挠度关系曲线存在峰值前和峰值后两个变形阶段，横向载荷首先达到峰值，破坏进一。步发展后纵向载荷达到峰值。锚固作用表现为组合拱梁层问离层和错动量减小，提高了组合拱梁峰值后承载力，可变形性得到改善。竖直方向地应力使顶板岩层形成铰接拱结构，水平地应力是拱铰压碎的主要力源。

Combined voussoir beams mechanism of bolt supporting in stratified rock roof

Distinct element method,physical stimulation and theoretical analysis make clear that the bolted stratified rock roof of roadway forms combined voussoir beams.Combined voussoir beams effect is one of the working mechanisms of the rock bolting.Modeling simulation indicates that the curves transverse load vs deflection and axial load vs deflection of combined voussoir beams both have pre-peak stage and post peak stage,transverse load reaches the peak at first,then the axial load reaches the peak,the shear displacement between combined voussoir beams is decreased,the strength of post peak of the combined voussoir beams is increased,the toughness is improved.Vertical stress makes rock stratum reforming voussoir beam,horizontal in-situ stress is the main source to cause the voussoir beam crushed.