深厚软弱地基修建土石低、中坝问题的研究

Study on low and medium-height earth rock dam built on thick and soft groundsill

一般情况下,在深厚软弱地基上,是不允许建设挡水坝这样的大荷载建筑物的,但随着地基处理技术的发展,能否在深厚软弱地基上筑坝以及能建多高的坝成为一个非常有研究价值的问题。某水电站拟修建在软弱堆积层厚度超过80 m的地基上,为了达到承载要求,采用了碎石桩和水泥搅拌桩等方法进行地基处理;通过有限元法的变形和应力分析,说明利用现有的地基处理技术,能够在深厚软弱地基上修建25 m左右的土石低坝,但如果兴建50m左右的中高度土石坝则应该非常谨慎。

In general, the thick and soft groundsill can＇t be taken on the load of dam, but with the development of technique in ground treatment, it was becoming a valuable problem to discuss whether a dam can be built on thick and soft groundsill. One dam will be going to construct on soft accumulative formation whose depth exceeded 80 m, in order to meet requirement of load- supporting, gravel pile and cement-soil mixing pile are applied to treat ground. Throuoh the de- formation and stress analysis FEM, has explained that using the existing ground treatment tech- nology, the thick and soft groundsill can be constructed 25 m low heighe earch rock dam, but it should be very cautious to build 50 m earth rock dam on the thick and soft groundsill.