软岩填筑高面板堆石坝分区及材料设计

通过分析软岩不同利用方案及分区形式对高面板堆石坝力学性状的影响,获取了坝体应力和变形的变化规律。高面板堆石坝下游次堆石区中软岩含量及堆石区几何特征、主堆石体分区形式均影响面板堆石坝的力学性状。提高坝体下游堆石区的强度及刚度,可以提高各堆石区之间的协调变形能力、降低面板变形及应力。提高位于坝轴线处的堆石体承载力,可以有效降低坝体变形及面板应力。为控制高面板堆石坝的坝体变形及应力,坝轴线处坝体下部堆石区宜填筑承载力高的堆石体,下游堆石区中软岩比例不宜超过30%。

Design of dam zoning and construction materials for a high concrete-faced rock-fill dam with soft rock

By analyzing the effects of different utilization schemes of soft rock and dam zoning forms on the mechanical properties of a high concrete-faced rock fill dam(CFRD), the characteristics about the stress and deformation of the dam were obtained. The proportion of soft rock in the downstream rock-fill zone, the geometric characteristics of the downstream rock-fill zone and the zoning form of the main rock-fill body can affect the mechanical properties of the high CFRD. With the increase of strength and stiffness of the secondary rock-fill zone in the downstream dam body, the deformation coordination between the primary rock-fill zone and the secondary rock-fill zone becomes better, and the deformation and stress of the concrete face slab are reduced. The dam deformation and face slab stress can be effectively reduced by improving the bearing capacity of the rock-fill body located at the dam axis. To control the deformation and stress of the high CFRD, the rock-fill zone at the lower part of dam body near the dam axis should be filled with the rocks of high bearing capacity, and the proportion of soft rock in the downstream rock-fill zone should not exceed 30%.