胶凝砂砾石坝层面效应及其稳定性研究

Layer effect and stability of dam with cemented sand,gravel and rock

以莆田萩芦溪西音水库工程拟建胶凝砂砾石坝为例,概化出静力刚体极限计算模型,并按建基面及不同高程处胶凝砂砾石填筑面进行坝体抗剪断系数与上下游垂直正应力计算分析。结果表明:同一水位荷载时,上游面垂直正应力随胶凝层面所处坝体高程位置升高而减小;当胶凝层面位置一定时,上游面垂直正应力随荷载水位升高而存在降低的趋势。坝基面抗剪断系数及坝踵处正应力随库水位升高而减小,坝趾处正应力随库水位升高而增大;工程建设及正常营运过程中,建议采取相应措施监测及检测胶凝砂砾石坝层面效应。

Taking the proposed dam with cemented sand,gravel and rock in Xiyin reservoir located at Qiuluxi of Putian as an example,the limit calculation model for static rigid body is generalized,and the shear resistance coefficient of the dam and the vertical normal stress of the upstream and downstream are calculated and analyzed according to the foundation surface and the filling surface with cemented sand and gravel at different elevations.The results show that the vertical normal stress at upstream face would decrease in the elevated location of CSGR layers in the dam when at the same water level.When at the same location of CSGR layers in the dam,the vertical normal stress at upstream face would downsize with the raised water level.The shear coefficient at bedrock surface of dam and the normal stress at the dam heel would decline with the raised water level,but the normal stress at the dam toe would rise up with the raised water level.Corresponding measures should be taken to monitor and dect the bedding effect of CSGR dam during the construction and operation of the reservoir.