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用碎石桩对软弱土进行地基处理是一种常用的地基处理方法,桩间土的固结问题是碎石桩复合地基中非常关注的问题,该问题在不同假设条件下的研究也取得了大量成果。在考虑桩土模量比(即应力状态稳定时的桩土应力比)及碎石桩面积置换率影响的前提下,基于等应变假设,将任意变荷载转化为傅里叶级数,从而推导出了变荷载作用下碎石桩桩间土固结解析解,给出了任意时刻桩土承担的应力变化关系,对现有理论进行了合理的修正。通过算例与现有理论对比分析表明,本算法合理可行,当碎石桩面积置换率及桩土模量比比较大时应该考虑其对固结的影响。此外,根据上述理论对Carrillo假设进行了分析,证明竖向和径向固结分别独立考虑的假设并不精确,但得出的总体规律与实际较为接近。
It is a common ground treatment method to treat soft soils with gravel piles. The consolidation of soil between piles is of great concern in the gravel pile composite foundation. The research on this problem under different assumptions has also been made A lot of results. Based on the assumption of constant strain, the arbitrary load is converted into the Fourier series considering the influence of pile-soil modulus ratio (ie, the stress ratio of pile-soil when the stress state is stable) and the replacement rate of stone column area The analytic solution of soil consolidation between stone piles and piles under variable loads is given. The stress changes assumed by pile and soil at any moment are given, and the existing theories are amended reasonably. The comparison between the example and the existing theory shows that the method is reasonable and feasible. When the ratio of replacement of the stone column and the modulus of the pile - soil is relatively large, the influence on the consolidation should be considered. In addition, the Carrillo hypothesis is analyzed based on the above theory, proving that the assumption of vertical and radial consolidation independently considered is not accurate, but the overall law is closer to reality.