地下厂房岩壁吊车梁的力学分析及设计

针对刚体极限平衡法的不足,利用非线性有限元方法,分析了岩壁吊车梁与围岩的相互作用,研究了锚杆的受力机理,并利用超载和强度储备法研究了岩壁吊车梁的安全裕度.结果表明,按刚体极限平衡法假设所设计的锚杆偏保守,与实际受力状况有很大差别,接触面不发生破坏时锚杆中的应力不大,即锚杆承受的载荷很小,接触面单元接近全部破坏时锚杆中的应力才会迅速提高.

Mechanical analysis and design of crane beam on rock wall for underground power house

The nonlinear finite element method was combined with the rigid body limit equilibrium method for analysis of the interaction between the crane beam and surrounding rock.The mechanism of anchor rod stress was investigated,and the safety factor of crane beam on rock wall was studied by use of the overload and strength reserve method.The results show that the anchor rod designed according to the rigid body limit equilibrium method has too high strength reserve and its stress state is not consistent with the reality,and that,by FEM analysis,the anchor rod stress is low in normal case with no failure occurring in the interface of crane beam and surrounding rock,but it increases rapidly as the elements of interface are nearly in the complete failure state.