排桩支护的桩侧土压力计算

在无粘性土的排桩支护中,从桩间土拱形成机理出发,认为土拱区土体受到等值的法向力作用,在桩间土体自由区和土拱区土体达到极限强度的条件下,得出桩间土拱的拱形参数,拱高和土拱的厚度,同时在考虑土拱区土体强度增加的情况下,结合桩土接触面处的土体强度约束条件和几何条件,在确定的桩距和桩径条件下,分析桩侧的土压力,通过求出不同桩径桩距条件下的土压力,从中找出一个最小土压力的桩参数,这个桩参数就是设计的值,其土压力计算结果位于朗肯主动土压力和静止土压力之间,与实际值基本一致。由此确定了桩的参数和土压力大小。

Calculation of the Earth Pressure Against Retaining Piles

Based on the forming mechanism of earth arches in retaining piles supporting cohesionless earth engineering,it is referenced that the soil arches area is under equivalent normal forece.Soil arches parameter of soil among piles,height and thickness of soil arches are determined under the condition that the free area and soil arch area of soil among the piles both attain the ultimate strength.At the same time,the strength of soil increased.Combined with the soil strength constraint conditions and geometry condition of pile-soil contact surface,soil pressure against retaining piles was analyzed with the determined distance and diameter.The pile parameter with minimum soil pressure is founded by obtain soil pressure of different pile distance hitch is the design parameter.The result is between Ranken active soil pressure and static soil pressure which is consistent to the actual result.All these are done to obtain pile parameter and soil pressure.