江垭碾压混凝土重力坝7#坝段应力分析

Analysis of concrete stress at No.7 segment of Jiangya roller compacted concrete gravity dam

根据坝体应变计的监测资料,经过一系列的计算,求得测点处的混凝土应力值。通过绘制应力过程线以及特征值统计,对各部位的混凝土应力分布态势和发展过程进行了定性和定量的分析;对测值变化规律及影响因素作了分析。通过分析认为,坝体多数测点混凝土处于受压状态,仅少数测点混凝土处于受拉状态。从应力变化过程看,坝体应力由于水压和坝体自重相互作用,多数测点应力变化速率较小,有的测点基本趋于稳定。各向应力变化比较均匀,基本上没有发生很大突变的现象,最大压应力和最大拉应力也在规范容许范围内,江垭大坝7#坝段混凝土应力状况基本正常。

Based on the monitoring data from the strain gauge on the dam body,the concrete stress of the measuring point was obtained by a series of calculations.According to the stress variation and eigenvalue statistic,qualitative and quantitative analyses of the stress distribution on each part of concrete and the development process were given in this paper.The changing pattern of the measured value and its influencing factors were also analyzed.The results show that concrete is in compressive state at most measuring points and in tension state at a few ones.On the basis of the stress variation,because of the interaction between the hydraulic pressure and the deadweight of dam body,the dam has a relatively small rate of variations at most measuring points.Stress variations in all directions are evenly distributed,and the maximum compressive pressure and tensile stress are both in permitted ranges.In the final analysis,the stress at No.7 segment of Jiangya Dam is basically normal.