溪柄碾压混凝土薄拱坝运行期位移预测和实测

溪柄碾压混凝土薄拱坝设计采用了仿真的材料热学参数.这些参数是在预测的施工温度条件下进行的材料实验中测定的.设计模拟了施工全过程,进行坝体的累计温度及自重徐变应力计算,提供施工期末初应力.本文提供运行期某一时刻水压和温度下相对施工期末的简易计算位移,并把计算值和短系列的原型观测数据进行比较修正.上述两者应力叠加即为该时全应力值.运行期位移突变或向下游变位过大都不安全.

Displacement Forecast and Measurement in Situ during Operation for Xibing Roller Compacted Concrete

Experimental thermal parameters of concrete material considering the temperature conditions during construction were used in the design of Xibing Roller Compacted Thin Arch Dam. The creep stresses computation of accumulated temperature and self weight according to construction process gives the initial stresses at the end of construction. In present paper the displacements by simple evaluation corresponding to the change of water levels and temperatures during operation and the end period of construction is given. Compared and modified the computational results with short series of displacements measured in situ. To sum up the two kinds of aforementioned stresses (or displacements) the total stress of dam is obtained. The dam is unsafe if the displacement changes suddenly or moves too much toward downstream.