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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年05期

页码:

183-191

栏目:

岩土工程

出版日期:

2023-09-15

文章信息/Info

Title:

Analysis of effect of different reinforcement methods of MJS on reducing impact of pipe jacking construction

文章编号:

1673-2049(2023)05-0183-09

作者:

张双茁¹,高桂庆^2,3,赖金星²,张健伟²,邱军领²

(1. 中铁第四勘察设计院集团有限公司,湖北 武汉 430063; 2. 长安大学 公路学院,陕西 西安 710064; 3. 广西交科集团有限公司,广西 南宁 530007)

Author(s):

ZHANG Shuangzhuo¹, GAO Guiqing^2,3, LAI Jinxing², ZHANG Jianwei², QIU Junling²

(1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007, Guangxi, China)

关键词:

地下工程;  矩形顶管;  数值分析;  水平旋喷桩;  加固

Keywords:

underground engineering;  rectangular pipe jacking;  numerical analysis;  MJS;  reinforcement

分类号:

TU311

DOI:

10.19815/j.jace.2021.12101

文献标志码:

A

摘要:

基于西安市某下穿箱涵的管廊工程,建立管廊-土-箱涵有限元模型,探究在该工程中采用的水平旋喷桩(MJS)水平竖向组合加固工法对降低顶管施工过程的影响效果; 建立不同桩距的2种水平桩工况,通过对不同工况下顶管在顶进过程中既有箱涵受力、变形以及相应地表沉降的不同变化进行分析,研究桩密度增加后对加固效果的影响; 将数值模拟中采用组合加固后4个断面的地表沉降与在施工过程中对地表实际监测得到的地表沉降规律进行了比较。结果表明:采用MJS水平竖向桩组合加固方式能有效降低顶管施工过程中既有箱涵因顶管施工而产生的变形、内力以及相应的地表沉降; 增加水平桩的数量并把桩间距减小50%时对加固效果的提升并不明显,故在实际工程中要合理设计桩的数量与间距并对桩的位置进行合理搭配; 地表沉降数值模拟结果和实际监测结果的大小与趋势都十分相似,验证了数值模拟的准确性。

Abstract:

Based on a pipe gallery project that passed through a box culvert in Xi'an city, a finite element model of pipe gallery-soil-box culvert was established to explore the effect of the horizontal and vertical combination reinforcement method of horizontal rotary jet grouting pile(MJS)used in the project on reducing the impact of pipe jacking construction process. Two horizontal pile conditions with different pile spacing were established, and the different changes in the force, deformation, and corresponding surface subsidence of the existing box culvert during the jacking process of the pipe under different conditions were analyzed to study the impact of increasing pile density on the reinforcement effect. A comparison was made between the surface subsidence patterns of four sections after combined reinforcement in numerical simulation and the actual monitoring of the surface during construction. The results show that the scheme of using MJS horizontal and vertical pile combination reinforcement can effectively reduce the deformation, internal force, and corresponding surface subsidence of existing box culverts caused by pipe jacking construction during the pipe jacking construction process. Increasing the number of horizontal piles and reducing the pile spacing by 50% does not significantly improve the reinforcement effect. Therefore, in practical engineering, it is necessary to design the number and spacing of piles reasonably and match their positions reasonably. The numerical simulation results of surface subsidence and the actual monitoring results are very similar in value and trend, verifying the accuracy of the numerical simulation.

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相似文献/References:

[1]胡双平.无柱加腋地铁车站土-结构模型振动台试验[J].建筑科学与工程学报,2020,37(04):116.[doi:10.19815/j.jace.2019.03042]
　HU Shuang-ping.Shaking Table Test of Soil-structural Model of Non-column Haunched Metro Station[J].Journal of Architecture and Civil Engineering,2020,37(05):116.[doi:10.19815/j.jace.2019.03042]

备注/Memo

备注/Memo:

收稿日期:2021-12-30
基金项目:国家重点研发计划项目(2018YFB2100905); 陕西省重点研发计划项目(2020SF383); 铁四院科学技术研究项目(2020K117-1)
作者简介:张双茁(1981-),男,工学博士,高级工程师,E-mail:2828567121@qq.com。
通信作者:邱军领(1989-),男,工学博士,讲师,硕士生导师,E-mail:870133597@qq.com。

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更新日期/Last Update: 2023-09-01