CCS水电站地下厂房施工过程中围岩稳定性分析
[Abstract]:The underground powerhouse of CCS Hydropower Station is composed of the main powerhouse and the main transformer chamber, which is a super large section underground cavern. the stress and deformation of the surrounding rock determine the safety and reliability of the underground powerhouse during the construction and operation of the underground powerhouse. Based on the analysis of engineering geological conditions, the geological generalization model is established by selecting the section of # 8 unit, and the numerical analysis model is established by using the finite element program Phase 2. The construction excavation and support are simulated based on the elastic-plastic constitutive relation. The distribution and variation characteristics of deformation field, stress field and plastic zone of surrounding rock during excavation are studied. The results show that the deformation and stress concentration of the roof arch mainly occur in the excavation of the floor, and the subsequent excavation has little effect on it, and the surrounding rock tends to be stable. The rock mass around the main powerhouse and main transformer chamber shows a plastic zone extending into the rock mass, and the failure of the rock mass in the plastic zone is mainly shear failure. Anchor rod and shotcrete support have little effect on the deformation of surrounding rock, and improve the stress concentration, tensile stress zone and plastic zone of surrounding rock to a certain extent. This research conclusion and method provide a reference for the construction excavation and support design of underground powerhouse.
【作者单位】: 黄河勘测规划设计有限公司;
【分类号】:TV731.6;TV223
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