三板溪堆石坝的变形监测分析

通过观测仪器对三板溪堆石坝沉降、顺河向水平位移、坝坡错位和土压力等现场观测，为坝体变形分析提供了重要依据。沉降观测资料表明，次堆石区局部部位沉降偏大。由于测量方法固有的缺陷，引张线式水平位移计不宜用于观测堆石坝水平位移；陡峭坝坡会加大沉降的不均匀性，导致面板拉应力的增加。土压力计的观测资料表明，主堆石区坝体拱效应明显。

Analysis on Monitoring Data for Displacement of Sanbanxi Rock-fill dam

The instrument monitoring dam settlement,horizontaldisplacement along river,dislocation along rock slope,soil compressive stressis installed to offer the base of analyzing Sanbanxi rock-fill dam displacement.The settlement data of Sanbanxi rock-filled dam show that some parts of secondaryrock-fill area have lower density and higher settlement.The stretchedwire displacemeter is not suitable to monitor the dam horizontaldisplacement along river because of its essentiallimitation.Steepdam slope increases inconsistencyof dam settlement and causes to tensile stress increment of concrete face.The monitoring data of soil piezometershow that the arc effect is obvious.