西安建筑科技大学学报(自然科学版)

交叉预应力锚索加固损伤支护桩现场试验研究

刘林¹,李雅丽^2,3,薛茜^2,3,张心玥^2,3,赵良杰^2,3,梅源^2,3

(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)

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

LIU Lin¹, LI Yali^2,3, XUE Qian^2,3, ZHANG Xinyue^2,3, ZHAO Liangjie^2,3, MEI Yuan^2,3

(1.No.6 Engineering Corporation Limited of CR20G, Xi'an 710032, China; 2.College of Civil Engineering, Xi'an Univ. of Arch. & Tech., Xi'an 710055, China; 3.Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an Univ. of Arch. & Tech., Xi'an 710055, China)

Keywords： underground space engineering; collapsible loess; prestressed anchor cable; damaged supporting pile; reinforcement technology

DOI: 10.15986/j.1006-7930.2021.01.004

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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.

引言
1 交叉预应力锚索加固技术
2 数值分析
3 工程实例分析
4 模拟与实测对比分析
5 结论

图1 交叉预应力锚索示意图<br/>Fig.1 Schematic diagram of cross prestressed anchor cable

图1 交叉预应力锚索示意图
Fig.1 Schematic diagram of cross prestressed anchor cable

图2 一桩一锚结构形式示意图<br/>Fig.2 Schematic diagram of one pile and one anchor structure

图2 一桩一锚结构形式示意图
Fig.2 Schematic diagram of one pile and one anchor structure

图3 一桩两锚结构形式示意图<br/>Fig.3 Schematic diagram of one pile with two anchors

图3 一桩两锚结构形式示意图
Fig.3 Schematic diagram of one pile with two anchors

图4 交叉预应力锚索加固示意图<br/>Fig.4 Site reinforcement diagram of cross prestressed anchor cable

图4 交叉预应力锚索加固示意图
Fig.4 Site reinforcement diagram of cross prestressed anchor cable

图5 交叉预应力锚索现场图<br/>Fig.5 Site drawing of cross prestressed anchor cable

图5 交叉预应力锚索现场图
Fig.5 Site drawing of cross prestressed anchor cable

表1 土层的物理参数<br/>Tab.1 Physical parameters of soil layer

表1 土层的物理参数
Tab.1 Physical parameters of soil layer

表2 支护桩参数<br/>Tab.2 Parameters of supporting pile

表2 支护桩参数
Tab.2 Parameters of supporting pile

表3 锚索参数
Tab.3 Anchor parameters

图6 土体及支护桩模型<br/>Fig.6 Soil and supporting pile model

图6 土体及支护桩模型
Fig.6 Soil and supporting pile model

表4 数值分析工况表<br/>Tab.4 Numerical analysis table

表4 数值分析工况表
Tab.4 Numerical analysis table

图7 桩身侧移云图<br/>Fig.7 Lateral displacement nephogram of pile

图7 桩身侧移云图
Fig.7 Lateral displacement nephogram of pile

图8 桩④桩身侧移曲线图<br/>Fig.8 Lateral displacement curve of pile 4

图8 桩④桩身侧移曲线图
Fig.8 Lateral displacement curve of pile 4

图9 桩⑨桩身侧移曲线图<br/>Fig.9 Lateral displacement curve of pile 9

图9 桩⑨桩身侧移曲线图
Fig.9 Lateral displacement curve of pile 9

图10 支护桩桩顶侧移随工况变化曲线图<br/>Fig.10 Curve of lateral displacement of supporting pile top changing with working condition

图10 支护桩桩顶侧移随工况变化曲线图
Fig.10 Curve of lateral displacement of supporting pile top changing with working condition

图11 桩顶竖向位移随工况变化曲线<br/>Fig.11 Variation curve of vertical displacement of pile top with working condition

图11 桩顶竖向位移随工况变化曲线
Fig.11 Variation curve of vertical displacement of pile top with working condition

图12 地表竖向位移云图<br/>Fig.12 Vertical displacement nephogram

图12 地表竖向位移云图
Fig.12 Vertical displacement nephogram

图13 各工况地表竖向位移模拟结果曲线<br/>Fig.13 Simulation results of surface vertical displacement under various working conditions

图13 各工况地表竖向位移模拟结果曲线
Fig.13 Simulation results of surface vertical displacement under various working conditions

图14 测点布置示意<br/>Fig.14 Layout of monitoring points

图14 测点布置示意
Fig.14 Layout of monitoring points

表5 基坑开挖及支护桩加固进度表<br/>Tab.5 Schedule of excavation of foundation pit and reinforcement of retaining piles

表5 基坑开挖及支护桩加固进度表
Tab.5 Schedule of excavation of foundation pit and reinforcement of retaining piles

图15 X1桩桩顶水平位移历时曲线<br/>Fig.15 Horizontal displacement duration curve of X1 pile top

图15 X1桩桩顶水平位移历时曲线
Fig.15 Horizontal displacement duration curve of X1 pile top

图16 X1桩桩顶竖向位移历时曲线<br/>Fig.16 Vertical displacement duration curve of X1 pile top

图16 X1桩桩顶竖向位移历时曲线
Fig.16 Vertical displacement duration curve of X1 pile top

图17 距基坑边缘不同距离测点地表竖向变形历时曲线<br/>Fig.17 Vertical deformation duration curve of ground surface at different distance from the edge of foundation pit

图17 距基坑边缘不同距离测点地表竖向变形历时曲线
Fig.17 Vertical deformation duration curve of ground surface at different distance from the edge of foundation pit

图18 桩顶侧移对比曲线<br/>Fig.18 Comparison curve of pile top lateral displacement

图18 桩顶侧移对比曲线
Fig.18 Comparison curve of pile top lateral displacement

图19 桩顶竖向位移对比曲线图<br/>Fig.19 Comparison curve of vertical displacement of pile top

图19 桩顶竖向位移对比曲线图
Fig.19 Comparison curve of vertical displacement of pile top

图20 地表竖向位移对比曲线图<br/>Fig.20 Comparison curve of surface vertical displacement

图20 地表竖向位移对比曲线图
Fig.20 Comparison curve of surface vertical displacement

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）张引科张小龙

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 交叉预应力锚索加固技术

2 数值分析

3 工程实例分析

4 模拟与实测对比分析

5 结论

期刊信息