砂垫层底面应力分布规律的理论分析

对换填法中关于砂垫层厚度的设计理论作了概括介绍 ,通过对土颗粒模型的分析 ,指出砂垫层底面附加应力为均匀分布和梯形分布两种假定的片面性 ,提出新的观点 :砂垫层底面附加应力的分布形状应根据垫层宽高比确定。当宽高比无限大时近似地认为均匀分布 ;宽高比等于或接近 1时 ,呈梯形分布 ;随着宽高比的逐渐减小 ,分布形状逐步过渡到三角形

Discussion on the model of superimposed stress distribution at the base of sand cushion

This paper introduces the general theory of sand cushion thickness design of replacement method, interprets the shortcomings existing in ladder-shaped distribution model and well-distribution model of the super imposed stress at the cushion base, and puts forward new standpoint, that is, the distributed law of superimposed stress at the sand cushion base is affected by the width height ratio. When the ratio is big enough, it is nearly well distributed; When the ratio is equal or close to 1, it will be ladder-shaped distributed; and with the ratio becoming more and more little, the distribution will eventually get to be triangle.