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采用有限元动力时程稳定和变形分析方法,对不同高度大坝坝坡稳定进行分析,开展了最危险滑弧确定方法、地震动持时对稳定和变形的影响、滑弧位置和深度以及坝坡加固范围的研究。结果表明:拟静力法采用规范建议的加速度分布系数不能反映高土石坝实际地震反应规律,计算得到的最危险滑弧较深且滑动范围偏大,不利于确定坝坡的加固范围;坝坡在地震过程中,最小安全系数与最大滑动量对应的滑弧并不一致且是不断变化的,有限元动力法计算坝坡稳定时,应在每一时刻任意搜索最危险滑弧;地震持时对坝坡安全系数影响不大,但对滑动量有较大影响;不同滑弧深度对坝坡安全系数有较大影响,存在一个临界深度,当滑弧超过临界深度时,坝坡安全系数大于1.0;坝坡稳定安全性评价需要综合考虑安全系数与变形的计算结果。根据计算结果,建议了坝坡加固的范围。
The finite element dynamic time-history and deformation analysis are used to analyze the dam slope stability at different heights. The method of determining the most dangerous slip-arc is carried out. The influence of the ground motion on the stability and deformation, the location and depth of the slippery arc, Study on reinforcement range of slope. The results show that the quasi-static method can not reflect the actual seismic response law of high earth-rockfill dam by adopting the normalized acceleration distribution coefficient. The calculated most dangerous slippery arc is too deep and the sliding range is too large, which is not conducive to determining the reinforcement range of dam slope. In the course of the earthquake, the minimum safety factor and the maximum sliding amount corresponding to the arc are inconsistent and constantly changing. Finite element dynamic method should be used to search for the most dangerous slippery arc at every time when the dam slope is stable. The safety factor of dam slope has little influence on the slide rate, but it has a great influence on the sliding amount. The different arc depth has a significant influence on the safety factor of dam slope, and has a critical depth. When the arc slip exceeds the critical depth, the slope safety factor is greater than 1.0 ; Safety evaluation of dam slope stability needs comprehensive consideration of the calculation results of safety factor and deformation. According to the calculation results, it is suggested that the scope of dam slope reinforcement.