|Table of Contents|

Numerical Simulation on Horizontal Deformation Control of Tunnel by Grouting(PDF)

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

Issue:
2021年06期
Page:
138-146
Research Field:
软土隧道施工与变形控制
Publishing date:

Info

Title:
Numerical Simulation on Horizontal Deformation Control of Tunnel by Grouting
Author(s):
DONG Min-zhong
(The Fourth Engineering Co., Ltd. of China Railway 18th Bureau Group, Tianjin 300200, China)
Keywords:
railway tunnel;  deformation control;  numerical simulation;  grouting
PACS:
TU311.2
DOI:
10.19815/j.jace.2021.08053
Abstract:
In order to study the influencing factors affecting the grouting effect, based on a foundation pit project in Tianjin, an in-situ grouting test was carried out in the site between the existing tunnel and the foundation pit. At the same time, the large-scale finite element simulation software PLAXIS was used to simulate the grouting process, and the effects of grouting distance, grouting amount, grouting depth, foundation pit excavation and porous grouting on the grouting effect were studied. In addition, the deformation laws of tunnel and soil were compared and analyzed when there was a tunnel around the foundation pit and no tunnel around the foundation pit. The results show that when grouting method is used to control tunnel deformation, high grouting efficiency can be achieved by coordinating the selection of grouting amount and grouting distance. The grouting amount shall be adjusted in time according to the foundation pit excavation and tunnel displacement. At the same time, repeated grouting shall be carried out at the same or similar positions to compensate the tunnel displacement recovery value, so as to control the overall tunnel deformation. When the top buried depth of the grouting range is the same as that of the tunnel axis, the horizontal displacement recovery value of the tunnel is the largest, which provides a reference for the determination of the grouting depth. The effect of grouting correction of tunnel displacement after foundation pit excavation is weakened to a certain extent compared with that without foundation pit, and the greater the amount of grouting, the more obvious the weakening of grouting effect is. The tunnel deformation can be controlled uniformly by arranging grouting holes according to the influence range of grouting and making full use of the superposition effect of porous grouting.

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Last Update: 2021-11-01