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首先在混凝土面板堆石坝工程中提出各向异性软岩筑坝的概念,与纯粹的软、硬岩筑坝予以区别。通过研究各向异性软岩之绿泥石片岩和其衍生堆石料,揭示各项异性软岩的物理力学特性。然后,在硬岩、砂砾石筑坝坝体主要分区示意图的基础上,提出各向异性软岩筑坝坝体主要分区示意图及相关施工措施。以新疆某水电站面板堆石坝工程为例,就该坝址区特殊的地形地质条件,对标准断面3种分区方案建立三维模型,辅以非线性有限单元法数值仿真,并对结果进行分析、比较,给出推荐方案,达到充分利用当地各向异性软岩的目的。
Firstly, the concept of anisotropic soft rock dam is put forward in the concrete faced rockfill dam project, which is different from the pure soft and hard rock dam. By studying the chlorite schist and its derived rock of anisotropic soft rock, the physical and mechanical properties of the anisotropic soft rock are revealed. Then, on the basis of the schematic diagrams of the main sections of the hard rock and sand-gravel dam, the main zoning diagrams and related construction measures of the anisotropic soft rock dam are proposed. Taking a concrete faced rockfill dam project of a hydropower station in Xinjiang as an example, a three-dimensional model of three types of zoning plans for a standard section is established on the basis of the special topographic and geological conditions in the dam site. The numerical simulation is complemented with the nonlinear finite element method and the results are analyzed. Compare and give the recommended plan to achieve the purpose of making full use of the local anisotropic soft rock.