拱坝坝体裂缝对坝体及坝肩应力应变影响分析

Analysis of influence of arch dam body crack on stress-strain of dam body and abutment

本文以某拱坝为案例,选取自重+正常蓄水位+泥沙压力+温降工况,采用三维非线性有限元方法,对拱坝模拟分布了4条典型裂缝及5号垂直对比缝,分析比较了裂缝对坝肩潜在滑动岩体及坝体拱冠梁处典型点的应力应变影响。分析表明,坝体平行裂缝位置变化对坝体及左右岸滑移面的影响甚微,坝体垂直裂缝对坝体及坝肩位移影响稍大。本文对拱坝坝体裂缝的影响分析,对拱坝裂缝危害处理有一定指导意义。

Taking an arch dam as a case,this paper selected dead weight+normal water storage level+sediment pressure+temperature drop,and adopted the three-dimensional nonlinear finite element method to simulate the distribution of four typical cracks and No.5 vertical contrast cracks for the arch dam,and analyzed and compared the effects of cracks on the potential sliding rock mass of the dam abutment and the typical points at the arch girder of the dam body.The analysis shows that the change of the position of parallel cracks has little effect on the displacement of the dam and the sliding surface of the left and right banks,while the vertical cracks have a little effect on the displacement of the dam and abutment.This paper analyzes the influence of the crack of arch dam body and has certain guiding significance for the damage treatment of the crack of arch dam.