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本文利用概化手段建立了小浪底地下厂房和尾水洞两剖面复杂岩体的地质模型,提出了相应的几何仿真程序技术,建立了能反映岩体中层面、软弱夹泥层节理及岩块的非线性力学行为的有限元离散模型,给出了一种考虑层面、节理变形的大型地下结构的强度、稳定分析数值计算方法。计算结果表明,按本文建立的较精细的计算模型所得到的成果与等效的连续介质模型差别较大;节理、层面材料参数的确定,加锚、加衬等施工措施在数值计算中的模拟对计算结果影响较大,此类问题在地下结构稳定分析中应予以高度重视。
In this paper, the geologic model of the complex sections of the Xiaolangdi underground powerhouse and the tailrace tunnel is established by using the generalized method. The corresponding geometric simulation program technology is put forward. The geological model which can reflect the joints, Nonlinear mechanical behavior of the finite element discrete model, given a layer, joint deformation of large underground structures strength and stability analysis of numerical methods. The calculation results show that the results obtained by the finer calculation model established in this paper are quite different from the equivalent continuous medium model. The joints, the determination of the material parameters and the simulation of the construction measures such as anchoring and lining are numerically calculated Which has great influence on the calculation results. Such problems should be highly valued in the stability analysis of underground structures.