登录
注册
E-alert
登录
注册
E-alert
Research on the Inclination Curve Type and Dangerous Point Judgment for Deeply Horizontal Displacement of Retaining Structures During Foundation Excavation
-
摘要: 基坑深层水平位移的变化曲线同时受支护形式、地质条件及周边建筑荷载等多种因素的影响,测斜曲线的形态各不相同,在复杂条件下甚至出现实测值超过控制值但基坑仍旧安全的情况,即水平位移最大值处并非结构最危险点。通过对8个典型基坑支护项目的105条测斜曲线线型的统计归类,并将各自形态与其受力特征相互关联;在此基础上提出一种用相对位移判断桩身危险点的方法。结果表明,根据形状特征测斜曲线可大致分为抛物线型、开口型、波浪型、反S型和其他五大类;用相对位移法找出支护结构危险点的方法基本可行,支护结构应力与相对位移呈线性关系,随着相对位移偏移值的增大而增大。Abstract: The variation curve of the deeply horizontal displacement of foundation excavation is influenced by many factors such as retaining forms, geological conditions and surrounding building loads. Therefore, the shape of the inclination measurement curve is different. In complex conditions, even the actual measured value exceeded the control value, the slopes of foundation still safe, namely, the maximum horizontal displacement was not the most dangerous point of the structure. Therefore, 105 inclination curves from 8 typical retaining projects of foundation excavation were statistically classified, and shapes of the curves and their force characteristics were correlated with each other;as well, a method for hazard judgment of piles by relative displacement was proposed. The results showed that the inclination curves could be roughly divided into five categories: the parabo type, the open type, the wave type, the inverse S type and the other according to the curve characteristics; the method for finding the dangerous points of the retaining structure by the relative displacement method was basically feasible. The stress of the retaining structure had a linear relation with the relative displacement, which increased with the increase of the relative displacement offset value.
-
[1] 刘惠涛,吴贤国,王震.武汉绿地中心超深超大基坑工程施工及安全控制分析[J].施工技术,2014,43(17):21-25. [2] 唐卫平,李得喜,盛小龙.软土地区某深基坑变形规律有限元模拟研究[J].武汉理工大学学报,2012,34(2):101-104. [3] XIE Z M,TU F. Reliability analysis of electronic total station and inclinometer in deformation monitoring of foundation pit[J]. Geotechnical Investigation&Surveying, 2009(9):81-84. [4] LI J K, LI L. Deep horizontal displacement measure-ment techno-logy in the application of foundation pit excavation[J]. Advanced Materials Research,2013(671/672/673/674):363-367. [5] 王琛,秦艳,刘洪啟,等.某基坑垮塌分析与处理[J].施工技术,2019,48(7),18-20. [6] 奚家米,尉阳.软土地区深基坑施工监测与变形特性的时空效应分析[J].科学技术与工程,2020,20(4):1587-1592. [7] 王超,朱勇,张强勇,等.深基坑桩锚支护体系的监测分析与稳定性评价[J].岩石力学与工程学报,2014,33(增刊1):2918-2923. [8] 唐传政,李景成,唐凌璐.武汉地铁某站出入口基坑局部垮塌处理[C]//第九届全国基坑工程研讨会论文集.北京:中国建筑学会,2016. [9] 周奎,吴宏伟.基于测斜数据的地下连续墙内力估算方法比较分析[J].建设科技,2020(12):92-94. [10] 毛朝辉.基于监测数据的围护墙弯矩反分析及安全评估研究[D].上海:同济大学,2006. [11] 付涛.基坑支护结构位移和弯矩的分析研究[D].武汉:武汉理工大学,2011. [12] LIN S S, LIAO J C, CHEN J T, et al. Lateral performance of piles evaluated via inclinometer data[J]. Computers&Geotechnics, 2005, 32(6):411-421. [13] 吴小将,刘国彬,卢礼顺.基于深基坑工程测斜监测曲线的地下连续墙弯矩估算方法研究[J].岩土工程学报,2005(9):1086-1090. [14] LI S Z, GAO N H. Safety Monitoring of continuously welded pipeline subjected to ground deformation using wireless microelectro mechanical sys4em inclinometers[J]. Advances in Mechanical Engineering, 2017,9(9). DOI: 10.1177/1687814017715194. [15] LI,S Z, PENG X H. Safety monitoring of underground steel pipeline subjected to soil deformation using wireless inclinometers[J]. Journal of Civil Structural Health Monitoring, 2016.DOI: 10.1007/s13349-016-0194-3. [16] 何钦,丘北刘,张记峰.基坑支护结构深层水平位移监测最佳间距设置的研究[J].广东土木与建筑,2020,27(11):56-60. [17] 朱慈勉,张伟平.结构力学[M].上海:高等教育出版社,2016. -
点击查看大图
计量
- 文章访问数: 128
- HTML全文浏览量: 26
- PDF下载量: 4
- 被引次数: 0
下载:
