岩锚吊车梁结构稳定的数值计算分析

采用二次细分网格法，结合三维弹塑性非线性有限元法，计算分析了某地下厂房运行期的岩锚吊车梁。在原始地应力场的基础上，用地下厂房的整体模型计算分期开挖，得到开挖后的地应力场。用这个应力场进行插值计算，得到岩锚吊车梁模型的初始应力场。在此基础上，施加荷载进行计算，全面地分析了正常开挖、超挖、欠挖3种工况下，不同体形岩锚吊车梁的受力特征、稳定性及锚杆的受力特征，明确指出了施工中超、欠挖对吊车梁稳定的不利影响。此外还分析了吊车梁混凝土与围岩接触面的C，φ值对滑动安全系数的影响。

Numerical Analysis on Stability of Rock-anchored Crane Beam

The rock-anchored crane beam of an underground plant is calculated by the method of secondly-divided grid and 3-D elastic-plastic nonlinear FEM. On the basis of the initial stress field, the global model of under-ground plant was used to calculate stage excavation and the field stress after excavation was got. Then this stress field is used to interpolate calculation and the initial stresses of crane-beam model are obtained. On this base, the crane-beam model under loading is calculated and different crane-beam shapes of normal-excavation, over-excavation, and under-excavation are studied. Their stress characteristics, stabilities and the anchor bars stress states are roundly analyzed and the disadvantages of excessive and insufficient excavation are definitely indicated. Moreover, the influence of C and φon the safety factor is studied.