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为了定量判定溃口范围,以小寨子河水库混凝土拱坝溃坝实例建三维实体模型,采用弹塑性有限元法,针对水库初期蓄水、溃坝气候条件,拟定溃坝水位+温降+自重工况,对坝体和坝基溃坝时受力(荷载)情况进行数值仿真分析.结果表明:坝体结构单薄,设计不合理,不符合规程规范要求;坝体中部一、二期混凝土交界冷缝是最薄弱部位;以受压为主、受拉为辅共同作用发生屈服破坏而局部溃坝;溃口首先发生于受压剪M-C安全系数小于1的坝体贯穿部位,最终的溃口范围覆盖M-C安全系数2.0区域,可作为计算拱坝溃坝洪水时确定溃口范围的参考依据之一.
In order to quantitatively determine the breach range, a three-dimensional solid model of Xiaozhaizihe reservoir dam is used to construct a three-dimensional solid model. Elasto-plastic finite element method is adopted. According to the initial impoundment and dam weather conditions, The results show that the structure of the dam body is very thin and the design is unreasonable, which does not meet the requirements of the codes and regulations. The cold joints between the first and second phases of the dam in the middle of the dam Is the weakest part; mainly by compression, tension together with the secondary role of yielding damage and partial dam; crashed mouth first occurred in the compression shear safety factor of less than 1 dam through the site, the final coverage of the breach cover MC safety The coefficient of 2.0 area can be used as a reference basis for calculating the range of the breach during the dam collapse.