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以托口水电站碾压混凝土重力坝为例,采用三维有限元法对施工期碾压激振力的大小及常态混凝土顶板的厚度进行了敏感性分析,发现施工期顶板不宜太薄,建议取3 m,以减小实际工程中因碾压设备激振力较大导致顶板混凝土开裂的概率;并对后期下闸封堵分别计算了同一坝段两个底孔先后封堵和同时封堵两种工况的应力应变情况,先后封堵工况中底孔环向拉应力值及范围均有所增大,且在结构分缝处的错动变形明显比同时封堵工况大,对止水适应变形的要求更严格,建议实际工程中导流底孔尽可能同时封堵或相隔时间不宜太长。
Take Tuokou Hydropower Station RCC gravity dam as an example, using three-dimensional finite element method to analyze the sensitivity of rolling vibration excitation force and normal concrete roof during construction, it is suggested that the roof should not be too thin during construction, m in order to reduce the probability of concrete cracking caused by the large excitation force of roller compaction equipment in the actual project; and the two bottom holes of the same dam section were successively closed and blocked at the same time for the subsequent sluice blockage Stress and strain conditions of the working condition, the tensile stress value and the range of the bottom hole in the plugging condition have been increased, and the staggered deformation at the structural parting joints is obviously larger than the sealing condition at the same time, Deformation to meet the more stringent requirements, it is recommended that the actual project diversion at the same time as the bottom of the hole at the same time or time should not be too long.