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通过对某水电站双竖井施工阶段进行有限元数值模拟,对开挖过程中的井壁应力、应变及土体变形规律进行了分析,并对施工的安全性进行了初步的评估。结果表明:竖井的受力形态呈现出悬臂梁的受剪状态,随着开挖深度增加,土体沿井侧变形增大,在深度超过90 m后,竖井的井口处土体变形不再明显。工程采用的“边开挖边支护”的施工方案是符合安全储备的。
Through the finite element numerical simulation of the construction stage of a double-shaft in a hydropower station, the stress and strain in the shaft lining and deformation of the soil during excavation are analyzed, and the safety of the construction is preliminarily evaluated. The results show that the stress state of the shaft shows the shear state of the cantilever beam. With the increase of the excavation depth, the deformation of the soil body along the well side increases. When the depth exceeds 90 m, the soil deformation at the wellhead is no longer noticeable . The project adopted in the project of “side excavation support” is in line with the safety reserve.