Influence of construction sequence of pipe jacking by pipe-roof pre-construction method on ground surface settlement

doi:10.3785/j.issn.1008-973X.2020.09.006

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (9): 1706-1714 DOI: 10.3785/j.issn.1008-973X.2020.09.006

Influence of construction sequence of pipe jacking by pipe-roof pre-construction method on ground surface settlement

Song-song YANG1(

),Mei WANG1,*(

),Jian-an DU2,Yong GUO3,Yan GEN1

1. College of Mining Engineering, Taiyuan University of Technology, Taiyuani 030024, China
2. Shanxi Provincial Housing and Urban-Rural Construction Committee, Taiyuan 030024, China
3. China Railway 14th Bureau Group Co. Ltd, Tai’an 271000, China

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Abstract

Taiyuan Railway Station’s application of the large-diameter pipe-roof pre-construction method (PPM) was used as the engineering background. A finite difference method software (FLAC^3D) was employed to numerically simulate the eight representative pipe jacking construction sequences, to study the surface deformation characteristics under the construction sequence of the large diameter pipe jacking group. The test results show that the surface settlement caused by the first construction of the pipe jacking scheme was less than other schemes, and the ground settlement caused by the construction scheme was 1 cm smaller than that of the construction scheme of the pipe jacking scheme first. An inter-pipe soil arch was formed between the upper row of jacking pipes on the pipe-roof and the surrounding soil, and a combined soil arching effect was formed between the dense row of jacking pipes above the upper pipe. The pipe soil arching effect can not only bear part of the overburden load of the pipe roof, but also reduce the disturbance of the ground surface caused by the construction of the pipe jacking under the pipe-roof. The combined soil arching effect can effectively reduce the ground surface settlement caused by the construction of the dense row pipe jacking group with the pipe-roof pre-construction method.

Key words： pipe-roof pre-construction method (PPM) densely packed pipe jacking group pipe jacking sequence combined soil arching effect numerical simulation

Received: 23 August 2019 Published: 22 September 2020

CLC:

TU 94

Corresponding Authors: Mei WANG E-mail: 18435167584@163.com;wangmei@tyut.edu.com

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Cite this article:

Song-song YANG,Mei WANG,Jian-an DU,Yong GUO,Yan GEN. Influence of construction sequence of pipe jacking by pipe-roof pre-construction method on ground surface settlement. Journal of ZheJiang University (Engineering Science), 2020, 54(9): 1706-1714.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.09.006 OR http://www.zjujournals.com/eng/Y2020/V54/I9/1706

管幕预筑法顶管施工顺序对地表沉降的影响

以太原火车站管幕预筑法（PPM）大直径顶管群施工为背景，采用有限差分软件FLAC^3D对优选的8种有代表性的顶管群施工顺序进行数值模拟，研究不同大直径顶管群施工顺序下的地表变形特征. 试验结果表明：先施工管幕上排顶管的方案所引起的地表沉降量小于其他方案，与先施工管幕下排顶管的施工方案相比，其所引起的地表沉降要小1 cm；管幕上排顶管与周围土体之间形成管间微型土拱，并在管幕上方密排顶管之间形成组合土拱效应. 该组合土拱效应不仅可以承担一部分管幕上覆荷载，而且可以减小管幕下排顶管施工对地表的扰动，有效减小了管幕预筑法密排顶管群施工所引起的地表沉降.

关键词： 管幕预筑法(PPM), 密排顶管群, 顶管顺序, 组合土拱效应, 数值模拟

Fig.1 Diagram for construction process of pipe-roof pre-construction method

Fig.2 Location of underground passage from north to south of railway station

Tab.1 Distribution of engineering geological layers

Fig.3 Pipe jacking position in north passage of railway station

Fig.4 North passage waterproof steel pipe-roof

Fig.5 Distribution of settlement monitoring points in north passage of railway station

Fig.6 Settlement curve of measured track and platform of railway station

Tab.2 On-site soil physical and mechanical parameters

Fig.7 Pipe jacking scheme with complicated construction plan

Tab.3 Prediction of accumulated surface settlement caused by different schemes

Fig.8 Surface settlement prediction results where is 10 m from starting position by eight schems

Fig.9 Accumulated surface deformation prediction for central axis by three schemes

Fig.10 Surface settlement simulation and measured curves for pipe jacking construction of track 10

Fig.11 Vertical displacement contour of two schemes

Fig.12 Schematic diagram of inter-pipe soil arch model and pipe soil arching model


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