交叉预应力锚索加固损伤支护桩现场试验研究  

Field test study on reinforcement of damaged supporting pile with cross-prestressed anchor cables

作　　者：刘林 李雅丽 薛茜 张心玥 赵良杰 梅源[2,3] LIU Lin;LI Yali;XUE Qian;ZHANG Xinyue;ZHAO Liangjie;MEI Yuan(No.6 Engineering Corporation Limited of CR20G,Xi′an 710032,China;College of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China)

机构地区：[1]中铁二十局集团第六工程有限公司,陕西西安710032 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]陕西省岩土与地下空间工程重点实验室,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2021年第1期24-32,共9页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省自然科学基础研究计划基金资助项目(2016JQ5091)。

摘　　要：以典型工程为背景,开展了交叉预应力锚索加固损伤支护桩的现场试验研究,采用数值模拟与现场监测数据相结合的方法,对交叉预应力锚索加固湿陷性黄土深基坑损伤支护桩的效果进行了分析,并对支护桩的桩顶侧移、竖向位移和地表沉降的变化规律进行了研究.研究表明:采用交叉预应力锚索加固损伤支护桩,可有效增加桩体的稳定性,减少基坑开挖或盾构掘进等施工过程对支护桩作用范围内的土体扰动,且成本低廉、便于施工,可作为黄土地区城市地下综合体交叉施工过程中桩体破坏加固的有效途径.Based on a typical project,the field test research on the reinforcement of damaged supporting pile with cross prestressed anchor cable is carried out.By combining numerical simulation with field monitoring data,this paper analyzes the effect of cross prestressed anchor cable strengthening the damaged supporting pile of collapsible loess deep foundation pit,and the variation rules of pile top horizontal displacement,vertical displacement and ground displacement are studied.Results show that the cross prestressed anchor cable can effectively increase the stability of the pile body,reduce the soil disturbance caused by the construction process of foundation pit excavation or shield tunneling,at low cost and is convenient for construction.It can be used as an effective way to reinforce the damaged pile body in the cross construction process of urban underground complex in loess area.

关 键 词：地下空间工程 湿陷性黄土 预应力锚索 损伤支护桩 加固技术 

分 类 号：TU392.6[建筑科学—结构工程]