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梨园水电站导流洞洞脸边坡开挖过程中发现距原设计开挖面垂直距离35 m处有一条裂缝横向贯穿导流洞,变形跟踪观测发现其有继续下滑的趋势,如不进行大范围的削坡卸载处理,将直接影响工程主体安全。为此,设计单位及时提出了设计修改通知及施工图。为了快速安全地按照变更后的设计要求完成洞脸边坡,尽量减少对导流明渠工程施工的影响,根据设计修改通知及施工图施工单位及时提出了洞脸开挖采取分两期进行的施工方案。
During the excavation of diversion tunnel slope face of Liyuan Hydropower Station, a crack transversely penetrating the diversion tunnel was found at a distance of 35 m from the originally designed excavation face. The deformation tracking observation showed that it had a tendency to continue to decline. For example, The cutting slope unloading treatment, will directly affect the main project safety. To this end, the design unit promptly proposed the design modification notice and construction drawings. In order to quickly and safely complete the slope face of the tunnel face according to the changed design requirements and minimize the impact on the construction of the diversion channel, according to the design modification notice and the construction drawings, the construction unit proposed in time the construction of the tunnel face excavation in two phases Program.