土石坝心墙材料分区优化设计

针对某土石坝工程,考虑对心墙进行分区且各分区采用相同或不同掺砾量的砾质土,对土石坝进行了三维有限元应力应变计算,并对土石坝心墙的土料选用及心墙分区方案进行了优化设计研究.结果表明,土石坝心墙上部应力水平较低,对坝料变形指标和力学指标要求不高,可采用天然黏性土或掺砾较少的砾质土,而其下部采用掺砾量较高的宽级配砾质土,这样,既可以满足坝体应力变形要求,保证心墙抗水力劈裂性能,也可以节省工程造价.

Optimum design for zoning of core wall materials of earth-rockfill dams

Based on the assumption that the core wall of an earth-rockfill dam is divided into various zones,and the gravelly soil with the same or different gravel contents is used in them,the three-dimensional finite element method was applied to analyze the stress and stain characteristics of the dam.The optimum design for the selection of earth materials and the zoning schemes of the core wall was studied.The test results show that the stress level at the upper part of the core wall is relatively small,resulting in the low requirements of deformation and mechanical indices of the dam materials.The natural clayey soil or the gravelly soil with less gravel content may be employed at the upper part of the core wall,while at the lower part,the wide grading gravelly soil with high gravel content should be employed.Thus the stress and deformation requirements of the dam are satisfied so as to ensure the hydraulic fracture properties of the core wall,furthermore,much investment is saved.