应用应力圆的准静止土压力计算

垂直挡土墙,墙后土体表面水平,不产生侧向变形为最简单情况下的静止土压力;当墙背倾斜、填土表面倾斜,或两者兼而有之的复杂计算条件为实际状态下静止土压力;本文分析了墙后土体不产生线应变而仅有剪切应变的土压力,称之为准静止土压力。具体分析方法如下:根据单元体在侧压力作用下的应力圆、极点及应变计算,得出在线应变为零的条件下,表面倾斜的墙后填土体作用在斜墙上的准静止土压力计算式。所导出满足线应变为零的准静止土压力计算式是静止土压力计算的延伸,有理论意义及使用价值。

Calculation of Quasi-earth Pressure at Rest by the Circle of Stress

The simple earth pressure is when the surface of soil behind vertical retaining wall is horizontal and there is no lateral deformation . The earth pressures in real state is that the surface of soil or the back of retaining wall is oblique. This paper studies the earth pressure of soil with shear strain but without linear strain,which is called quasi-earth pressure. By calculation of the circle of stress,polar point and strain for the element under the lateral pressure,this paper puts forward expressions of quasi-earth pressure at rest acting upon the inclined wall. The expression mentioned above extends the calculation of earth pressure at rest and has theoretical and practical significance.