考虑土拱效应的双排抗滑桩桩侧土压力计算  

Calculation of Soil Pressure against Double-row Anti-slide Piles Considering Soil Arching Effect

作　　者：杨明辉[1] 汪罗成[1] 赵明华[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路交通科技》2011年第10期12-17,39,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50708033);教育部博士点基金项目(20070532008)

摘　　要：分析了双排抗滑桩结构承载的最不利状态。首先考虑纵向桩间土拱成拱机理,利用土拱抛物线拱轴线的几何特征及拱脚处的力平衡及应力状态,导出作用于双排桩桩侧的坡体土压力分布;然后针对双排抗滑桩桩间土体有限边界特点,通过对桩间土不同区域分别采用薄层单元法对土压力的分布模式进行求解,导得桩间土作用于双排抗滑桩桩侧土压力分布,由此得出了最不利受力状态下双排抗滑桩桩侧土压力计算方法。将其应用于双排抗滑桩内力分析计算,得出了双排桩桩身内力计算的有限差分算法。试验数据对比表明,该方法计算结果与实测数据较为接近,可供双排桩设计参考。The most disadvantaged load bearing condition of double-row anti-slide piles structure was analyzed. First, considering the longitudinal soil arching mechanism between piles, and making use of geometrical characteristic of parabolic soil arching axis as well as equilibrium and stress states of arch springing, the distribution of slope soil pressure against double-row piles was derived. Second, according to the characteristics of limited boundary between double-row anti-slide piles, by using thin-layer element method to different regions of soil against piles to analyse the pattern of soil pressure distribution, the distribution of soil pressure against double-row anti-slide piles was derived, thus the calculation method of soil pressure against piles in the most disadvantaged load bearing state was obtained. The calculation method was applied to calculate the internal forces of double-row anti-slide piles, and the finite difference method for calculating internal forces of double-row anti-slide piles was obtained. The comparison of experimental data with calculated values show that the method has very high precision and can be as a reference for double piles design.

关 键 词：道路工程 双排抗滑桩 桩侧土压力 土拱效应 有限差分 内力分析 

分 类 号：U416.140.1[交通运输工程—道路与铁道工程]