【摘要】 为了研究鲁布革水电站地下厂房围岩采用锚喷支护的效果,我们曾进行了相似材料模型试验研究和有限元计算。模型试验和有限元计算分别对有支护和无支护的洞室围岩应力分布;围岩位移;以及洞室失稳的破坏荷载、破坏范围和破坏形态进行了研究。分析研究结果表明,锚喷支护能够改善洞室围岩的受力条件,增加围岩整体变形刚度和提高围岩的承载能力。洞室进行锚喷支护后,围岩拉、压应力值都有所降低;围岩周边最大变形减少20％左右,洞室破坏荷载可提高50％左右。本文对洞室围岩、喷混凝土层及锚杆的破坏机制亦进行了讨论。更多还原

【Abstract】 In order to study the effects of shotcrete and rock bolting support of underground openings, we have made model tests with modelling meterial and calculations with the F. E. M. for the underground power house of Lubuge Hydropower Station. The dimension of this power house is 125×17.5×39.4m （length在width×height）. The rock stratum there mainly consists of limestone at a depth 30m below the power house, there exist two faults F₃₁₃ and F₂₀₃. The mechanical parameters of rock and faults are shown in Table 1. The initial stress of rock is considered to be mainly gravitational stress. Because of the influence of the valley topography, the direction of the maximum principal stress intersects the vertical axis of the cross section of the power house at an angle of 25°（Fig. 3）.更多还原