小岩头水电站厂房基坑涌水处理设计与施工

Design and Construction of Powerhouse Foundation Pit Water Inflow Treatment of Xiaoyantou Hydropower Station

小岩头水电站厂房位于小菜园电站下游侧河漫滩上,下游侧为小菜园河。2009年4月26日在厂区基坑下卧至1 192.00 m时,基坑内出现大量的涌水,最高达2 000 m3/h。为确保厂房工程干地施工,经地质补勘资料分析及对涌水成因的初步判断,设计提出涌水处理方案及详细的施工技术要求,2009年9月20日厂房基坑涌水堵截成功,厂区基坑恢复干地施工。

Xiaoyantou Hydropower Station is situated on the flood plain downstream of Xiaocaiyuan power station.Xiaocaiyuan River is on the downstream side.When the powerhouse foundation pit is excavated to 1 192.00 m on April 26,2009,water inflows to maximum 2 000 m3/h.In order to ensure dry construction of the powerhouse,the designer put forward water inflow treatment option and detailed construction requirements after analysis on supplementary geologic survey and preliminary judgment on cause of water inflow.Water inflow was successfully intercepted on September 20,2009,and dry construction is restored to the powerhouse foundation pit.