厂坝联合条件下重力坝应力及抗滑稳定分析

关于厂坝联合作用对重力坝坝基抗滑稳定的影响一直是水利水电工程中比较关注的问题。针对这一问题，结合金安桥水电站重力坝工程，通过弹塑性有限元方法和坝基抗滑稳定系数的计算进行了探讨和分析。结果表明，对于水电站的河床坝段，不论是通过传统研究方法 法，超载法还是强度储备安全系数计算方法，都说明通过厂坝联合的共同作用，可有效地提高坝基浅层抗滑稳定性能，但提高效果不很明显。另外，采用厂坝联合作用后，可有效地降低坝体内的最大压应力和拉应力，使坝体内的应力分布更加均匀，可使厂坝连接处的发电进水钢管的挠度曲线比较光滑连续，减小了因挠度突变而产生不利的附加应力，有利于发电进水钢管的正常安全运行。

Analysis of stress,deformation and stability against sliding of gravity dam under combined action of dam and power house

The influence of the combined action of powerhouse and dam on sliding stability of gravity dam is a key problem in hydropower projects. In this paper, the problem is analyzed and discussed by means of application of elastic-plastic FEM and calculation of sliding stability safety factor of dam foundation in Jin’an qiao Hydropower Project. The results show that the combined action of powerhouse and dam could effectively improve the sliding stability of superficial dam foundation, but not helpful to the deep dam foundation of Jin’an qiao hydropower station riverbed dam section with the traditional method , overload method and safety factor of strength reserve . Moreover, under the combined action of powerhouse and dam, the maximal compression and tension stress in dam body are decreased effectively to make the stress distribution more uniform. At the same time, the deflection curve of power penstock becomes more smooth to decrease the additional stress caused by the deflection break, which is so as to benefit safe operation of the penstocks.