黄土基坑单排内外斜直组合桩支护性能分析  

Analysis of Support Performance of Single Row of Internal and External Inclined Vertical Composite Piles in Loess Foundation Pit

作　　者：罗龙平 曹卫平[1,2] 赵敏 肖涵楠[1] LUO Longping;CAO Weiping;ZHAO Min;XIAO Hannan(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Key Lab of Geotechnical and Underground Space Engineering,Xi’an 710055,China;College of Civil and Architecture Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]陕西省岩土与地下空间工程重点实验室,西安710055 [3]西安工业大学建筑工程学院,西安710021

出　　处：《武汉理工大学学报(交通科学与工程版)》2025年第1期160-166,共7页Journal of Wuhan University of Technology(Transportation Science & Engineering)

基　　金：陕西省自然科学基础研究计划一般面上项目(2024JC-YBMS-299)。

摘　　要：文中通过在黄土地基中开展室内模型试验,对比分析人字形与个字形组合在开挖过程中的受力及变形变化规律,并采用PLAXIS 3D验证试验结果,研究不同斜桩倾角对支护性能的影响.结果表明:人字形组合对桩身变形及坑外地表沉降的控制效果优于个字形组合,基坑稳定性更高,更适用于周围环境复杂的基坑工程;两种支护结构中的内、外斜桩分别发挥着内支撑、锚杆的作用,可以给直桩提供水平支撑轴力,有效提高支护刚度,具有一定的自撑效应;冠梁与支护桩组成一个空间刚架,有效提高了抗侧移刚度,是发挥自撑效应的前提;桩间土对于提高支护整体稳定性发挥重要作用,其中人字形组合所提供的抗倾覆力矩大于个字形;斜桩倾角增大支护性能得到明显提升,建议斜桩倾角为20°.Through the indoor model test in loess foundation,the stress and deformation variation law of herringbone and herringbone combination during excavation were compared and analyzed,and the test results were verified by PLAXIS 3D,and the influence of different inclined piles on supporting performance was studied.The results show that the control effect of herringbone combination on pile deformation and settlement outside the pit is better than that of herringbone combination,and the stability of foundation pit is higher,which is more suitable for foundation pit engineering with complex surrounding environment.The inner and outer inclined piles in the two kinds of supporting structures play the roles of inner support and anchor rod respectively,which can provide horizontal support axial force for the vertical piles,effectively improve the supporting stiffness and have a certain self-supporting effect.The crown beam and supporting piles form a spatial rigid frame,which effectively improves the lateral stiffness and is the premise of exerting the self-supporting effect.The soil between piles plays an important role in improving the overall stability of the support,and the anti-overturning moment provided by the herringbone combination is greater than that provided by the herringbone combination.With the increase of inclined pile angle,the supporting performance is obviously improved,and it is suggested that the inclined pile angle is 20.

关 键 词：斜直桩 黄土基坑 模型试验 支护性能 PLAXIS 3D 

分 类 号：TU473[建筑科学—结构工程]