桩-锚支护深基坑变形试验研究  

EXPERIMENTAL STUDY ON DEFORMATION OF DEEP FOUNDATION PIT WITH PILE-ANCHOR SUPPORT

作　　者：刘旭 吴昊 赵延林 LIU Xu;WU Hao;ZHAO Yanlin(School of Civil Engineering,Heilongjiang University of Science&Technology,Harbin 150000,China)

机构地区：[1]黑龙江科技大学建筑工程学院,哈尔滨150000

出　　处：《低温建筑技术》2020年第1期109-111,共3页Low Temperature Architecture Technology

摘　　要：结合北京市某深基坑工程,通过现场原位监测试验,分析了支护桩变形、锚杆轴力、周边地表沉降变形与地下管线沉降变形随基坑开挖进程的变化情况。分析表明支护桩桩身水平位移的最大值发生在桩顶,基坑底面以上2~5m区域的桩身位移较大;基坑开挖对上部锚杆的轴力影响较大,对下部锚杆的轴力影响较小;周边地表沉降变形总体呈现V字型,最大沉降位移发生在距基坑边缘6.5m处,基坑边缘土体的竖向位移表现为反弹位移。地下管线的沉降变形总体呈现波浪型,最大差异沉降值为17mm。Combined with a deep foundation pit project in Beijing,the deformation of support pile,axial force of anchor bolt,settlement of surrounding surface and the deformation of underground pipeline with the process of foundation pit excavation are analyzed through in-situ monitoring test.The analysis shows that the maximum horizontal displacement of the retaining pile occurs at the top of the pile,and the displacement of the pile is larger in the area of 2~5m above the bottom of the foundation pit.The influence of foundation pit excavation on the axial force of upper bolt is greater than that of lower bolt;The settlement deformation of the surrounding surface is generally V-shaped.The maximum settlement displacement occurs at 6.5m away from the edge of the foundation pit is reflected as the rebound displacement.The settlement deformation of underground pipelines is generally wavy,and the maximum differential settlement value is 17mm.

关 键 词：桩-锚支护 深基坑 变形 

分 类 号：TU441.6[建筑科学—岩土工程]