水电站地下厂房岩锚吊车梁稳定性分析剖析

The fine FEM analysis for rock-bolt crane girder in underground powerhouse

本文从模拟锚杆穿越缝隙的力学行为入手,提出一种模拟方法分析岩锚吊车梁的工作性状;通过岩锚吊车梁超载的数值仿真试验分析其破坏模式,表明以岩壁接触面上抗滑力与滑动力的比值为安全系数的传统方法无明确意义;提出以岩锚吊车梁在荷载作用下达到横向限制变形使吊车发生卡轨时为其破坏条件,用超载法求得其安全系数,并讨论了此安全系数与岩壁接触面粘聚力和摩擦系数的关系,与传统安全系数相比,具有明确的物理意义和工程意义。

A method is proposed to simulate the work character of interface and the mechanics behavior of bolt cross interface so as to simulate its resistant tensile and shear mechanism, and then to analyze the character of rock-bolt crane girder. The example of numerical simulation analysis of failure mode by overloading method indicates that the traditional safety factor equal to the ratio of slip resistance to slide force hash＇ t any distinct meaning. The state that the crane deforms to horizontal restricted deformation and can not slide freely is taken as the destroy condition, the safety factor obtained by overloading has distinct meaning in engineering compared to the traditional method. Finally, the relationship between the safety factor obtained by overloading method and the cohesion and friction of the interface is discussed.