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高拱坝在强震作用下 ,伸缩横缝出现开裂 ,在一定程度上削弱了坝体的整体性能 ,不仅使得坝体的动力反应重新分布 ,坝肩岩体抗滑稳定的主要参数—拱端推力也产生很大变化 ,横缝的存在增加了对坝肩岩体进行抗滑稳定分析的复杂程度 .本文给出了用动态子结构法计算有伸缩横缝坝体拱端推力的计算公式 ,并对坝体设有伸缩横缝的溪洛渡双曲拱坝的计算模型分别在人工地震波及柯依那地震波作用下 ,考虑库水—坝体相互作用、坝体自重、上游淤沙等因素的影响 ,对溪洛渡拱坝的拱端推力进行了计算 ,并通过拱端推力计算了拱座岩体的抗滑稳定安全系数 .文中算式同样适用于其它结构
Under the action of strong earthquakes, the high arch dam cracks, which weakens the overall performance of the dam to some extent. It not only redistributes the dynamic response of the dam, but also the main parameter of anti-sliding stability of dam abutment - The thrust also has a great change, the presence of transverse joints increases the complexity of the anti-slide stability analysis of the abutment rock mass.This paper gives the calculation formula for the thrust of the arch end of the telescoping transverse dam with dynamic substructure method, And the calculation model of the Xiluodu Double Curvature Arch Dam with extensible transverse joint is proposed to consider the interaction between the reservoir water and the dam body, the self weight of the dam and the upper silt sediment under the action of artificial seismic wave and Cohena seismic wave respectively , The thrust at the arch end of Xiluodu arch dam was calculated, and the safety factor of anti-slide stability of arch rock mass was calculated by the arch-end thrust force.The formulas in the paper are also applicable to other structures