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溪洛渡左岸布置两条出线竖井,其总深度为488.5 m,穿越的覆盖层深度达到120m。已有的监测资料表明左岸出线竖井已向下游侧变形约1 mm,向河谷侧变形约18 mm。本文拟合观测墩变形数据,对左岸两条出线竖井及其井壁衬砌结构进行三维非线性有限元分析,得出竖井详细的应力变位情况,并确定观测墩变位和竖井最大变形值的关系,从而提出了竖井观测墩变位的预警控制阈值,以及竖井可能的破坏模式。最后对不同岩层接触面进行了抗滑稳定计算,结果表明沿着这些面整体抗滑稳定安全系数满足设计要求。
Two outlet shafts are arranged on the left bank of Xiluodu, with a total depth of 488.5 m and a depth of covering of 120 m. The existing monitoring data show that the left bank outlet shaft has been deformed to about 1 mm on the downstream side and about 18 mm to the valley side. This paper fits the deformation data of the observed pier, and conducts the three-dimensional nonlinear finite element analysis of the two outlet shafts and the lining structure of the lining of the left bank. The detailed stress displacement situation of the shaft is obtained and the displacement of the observed pier and the maximum deformation of the shaft are determined Therefore, the threshold value of early warning control for the displacement of shaft observation pier and the possible failure mode of the shaft are proposed. Finally, the contact stability of different strata was calculated. The results show that the overall safety factor of anti-sliding along these surfaces meets the design requirements.