重庆码头大直径深嵌岩短桩水平承载力试验研究

EXPERIMENTAL STUDY OF HORIZONTAL BEARING CAPACITY OF LARGE DIAMETER ROCK-SOCKETED SHORT PILE IN CHONGQING DOCK

在码头建设过程中,由于山区场地条件的限制,大直径深嵌岩短桩在工程中得到了使用,但是在水平荷载作用下,相应的原位试验研究还比较缺乏。通过采用对顶法对重庆码头大直径深嵌岩短桩的水平承载特性进行测试,分析包括桩顶的荷载-位移曲线、水平位移分布规律以及桩身弯矩及剪力的分布情况。研究结果表明:大直径深嵌岩短桩水平荷载与位移关系基本呈直线分布,增加桩长对改善其水平受力性能较为有利;从桩土的侧向变形来看,变形主要发生在上部填土处,表层处土体的密实度及桩径大小对侧向变形影响较大;从桩身的内力分布来看,桩身弯矩在距离地表6 m处最大,最大剪力主要分布在地表附近。

In the construction process of docks , due to limitations of mountain site , the large diameter socketed short piles were used in those areas .But the in-situ experimental study was lacking under horizontal load .The top-loading method was used to test and the horizontal bearing characteristics of short large -diameter rock-socketed piles were analyzed , including load-displacement curve , horizontal displacement distribution , the distribution of the bending moment and shear force along the pile legth .The results indicated that the relationship between horizontal load and displacement of short pile was linear distribution , and the increase of length was more favorable to improve its horizontal mechanical properties .From the lateral deformation of pile , the deformation occured mainly in the upper soil, surface soil density and the size of pile had a significant influence on its lateral deformation .From the distribution of internal forces of piles , the maximum bending moment was located in 6 m below the surface and maximum shear mainly distributed near the surface .