摘要
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,有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。
For pile-in-row supporting structure in noncohesive soil,it can be considered that soil in soil arch endures equivalent normal force on the formation principle of soil arch.Under the condition that the soil in free zone between piles and soil in soil arch reach ultimate strength ,the shape parameters ,the height and the thickness of soil arch be- tween piles are obtained. Considering the increasing of the strength of soil in soil arch and combining with the con- strained condition of soil strength and the geometric condition of interface between soil and pile,the earth pressure at the side of pile with certain spacing and diameter in analyzed, and by computing earth pressure with different spacing and diameter of piles,the parameters of pile under least earth pressure is found. The parameter of pile is the design value, and the corresponding earth pressure is between Rankine active earth pressure and immobile earth pressure and is consistent with the actual value.
出处
《福建建材》
2011年第6期12-14,65,共4页
Fujian Building Materials
关键词
土拱
等值法向力
桩侧土压力
朗肯主动土压力
soil arch
equivalent normal force
the earth pressure at the side of pile
Rankine active earth pressure
