碎石桩复合地基承载力探讨

Discussion on Bearing Capacity of Crushed Stone Composite Ground

研究目的:通过分析碎石桩复合地基承载力确定方法的不足,指出在饱和粘性土中碎石桩复合地基承载力计算式中引入桩土应力比的不全面性和应当考虑桩间土强度增长对复合地基承载力的影响。在此基础上,探讨初始复合地基承载力和在预压进程中复合地基承载力的确定方法,力求获得复合地基承载力随时间增长的动态计算公式。研究结论:对于散体材料桩体承载力的发挥依赖于桩间土的强度,两者为相关变量,因此碎石桩复合地基承载力可表示为桩间土抗剪强度的函数;碎石桩复合地基承载力是一动态变量,随桩间土强度增长而增长;给出预压进程中复合地基承载力随时间增长的动态计算公式,以便信息化施工。

Research purposes： After analyzing the shortcoming of the methods for calculating the bearing capacity of the crushed stone pile composite foundation, this paper points out the incompleteness of stress ratio of pile and soil introduced into the calculation formula for the bearing capacity and the effect of increase of the soil strength on the bearing capacity of composite foundation. Base on these, the discussion is on the calculation methods for the initial bearing capacity and dynamic bearing capacity during pre - loading of composite foundation to seek the dynamic calculation formula for the bearing capacity of composite foundation. Research conclusions：This bearing capacity of granular material pile depends on the strength of soil between the piles and they are variable. So the bearing capacity of crushed stone pile composite foundation can be expressed as the function of soil＇s shear strength. The bearing capacity of crushed stone composite foundation is a dynamic variable, increasing with the increase of the soil strength between the piles. The calculation formula for the dynamic bearing capacity of composite foundation is presented for construction with It.