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目前,岩壁吊车梁设计所采用的刚体极限平衡设计方法还不能确切反映岩锚吊车梁的实际受力状态。有限元法是分析研究岩壁吊车梁较为有效而应用广泛的一种方法,围绕岩壁吊车梁有限元法中的关键技术问题开展系列研究工作。根据岩壁吊车梁的受力机制,建立相应的力学模型、安全度计算公式,研究吊车梁网格尺度、模型范围、初始应力场、锚杆套筒长度以及围岩类别等因素对有限元结果的影响,同时还研究开挖释放应力和运行期轮压作用对岩壁吊车梁的双重效应。主要研究成果已被《地下厂房岩壁吊车梁设计规范》(送审稿)及条文说明所采用。
At present, the rigid body limit equilibrium design method used in the design of the rock-walled crane beam can not exactly reflect the actual stress state of the rock bolt crane beam. The finite element method is a more effective and widely used method for analyzing and researching the crane beam on a rock wall. It carries out a series of research work on the key technical issues in the finite element method of the crane beam. According to the mechanical mechanism of the crane beam, corresponding mechanical model and safety formula are established, and the factors such as the grid scale of crane girder, the model range, initial stress field, the length of the anchor sleeve and the type of surrounding rock are studied. At the same time, we also study the dual effects of excavation stress and wheel-wheel loading on rock-wall crane girder. The main research results have been adopted by “Code for Design of Rock Crane Beam in Underground Powerhouse” (draft for approval) and the clauses.