挡墙平动模式下邻近长-短桩复合地基基坑土压力试验研究  

Experimental Study on the Lateral Earth Pressure of Translational Retaining Structures Adjacent to Composite Foundation of Long-Short Piles

作　　者：郭院成[1] 谷少闯 魏艳卿 李明宇[1] GUO Yuancheng;GU Shaochuang;WEI Yanqing;LI Mingyu(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Department of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471000,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]洛阳理工学院土木工程系,河南洛阳471000

出　　处：《工业建筑》2022年第5期174-178,共5页Industrial Construction

基　　金：国家自然科学基金项目(51908513)。

摘　　要：针对邻近长短桩复合地基基坑土压力,通过室内模型试验,研究邻近长-短桩复合地基基坑开挖过程中,随着基坑侧壁水平位移的发展,基坑土压力分布曲线的变化规律。研究表明:挡墙发生位移时,短桩加固深度范围内,邻近长-短桩复合地基挡墙土压力小于天然地基条件下的土压力,短桩桩端下部挡墙土压力则显著大于天然地基条件下的土压力;在计算邻近长-短桩复合地基挡墙土压力时需考虑短桩桩端附加荷载的影响;邻近长-短桩复合地基条件下的基坑土压力可近似等效为桩间土附加应力、短桩附加应力与长桩附加应力分别产生的基坑土压力的代数和,据此建立了邻近长-短桩复合地基基坑土压力的简化计算方法。A model test was conducted to analyze the lateral earth pressure behind a translating retaining structure near an existing composite foundation of long-short piles. The results showed that when the retaining structure was translated outward, the lateral earth pressure behind the retaining structure adjacent to composite foundation of long-short piles was less than that in the natural foundation within the depth of reinforced by short piles. However, the earth pressure below the bottom of reinforcing short piles was significantly larger than that in natureal foundation. It was suggestion that the influence of the additional load transferred from the short piles should be taken into account in calculation of lateral earth pressure behind a retaining structure. It was also found that the lateral earth pressure adjacent to composite foundation with long-short piles could approximately be equivalent to the algebraic sum of the earth pressure caused by additional stress in soil between piles and additional stress from the short and long piles respectively. Based on that, a formula for calculating the lateral earth pressure behind a retaining structure adjacent to composite foundation with long and short piles was proposed.

关 键 词：基坑工程 土压力 长-短桩复合地基 试验研究 

分 类 号：TU47[建筑科学—结构工程]