小湾水电站库盘监测系统变形效应分析

Research about Deformation Effects of Xiaowan Hydropower Station Reservoir Basin Monitoring System

小湾水电站工程属大(Ⅰ)型一等工程,永久性主要水工建筑物为一级建筑物。该工程为混凝土双曲拱坝,拱坝高294.5 m,建成后将形成149.14×10~8m^3的水库,总水推力约181 000 k N。监测成果显示,高拱坝库盘变形对大坝及其枢纽区的影响真实存在,巨大的水荷载作用致使库盘产生坝前沉降大于坝后沉降的"翘曲"变形,使得拱坝产生向上游倾斜变形现象,以及整个枢纽区倾倒现象。因此,利用库盘变形实测资料,对小湾高拱坝库盘变形的规律、量级以及对拱坝及其枢纽区的作用效应等进行了深入的研究。

Xiaowan Hydropower Station is a large -scale project with first class, and permanent major hydraulic structures are first class building. This project is concrete double arch with the height up to 294.5 m and capacity of 149.14 × 10s m3 , and the total hydraulic thrust will be about 181 000 kN. With the indication of survey results, it dose truly exist that the high arc reservoir ba- sin effects the dam and hub area. The huge water load causes bigger settlement before the reservoir basin than the another side which is called ＂warpage＂ deformation. This phenomenon leads to the arch dam inclination deformation towards upstream, and the tendency of whole hub area. Therefore, this paper depth studied about the discipline, magnitude of high arch dam reservoir basin deforma- tion by the measurement data.