|Table of Contents|

Development and Technical Research of New Prefabricated Temporary Support Structure for Tunnel(PDF)

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

Issue:
2022年05期
Page:
262-273
Research Field:
基础工程
Publishing date:

Info

Title:
Development and Technical Research of New Prefabricated Temporary Support Structure for Tunnel
Author(s):
LUO Wei-bin1; 2;  QIAO Xiong3;  NI Wei-lin3;  LIU Wen-gao3;  TIAN Guo-qin1; 2;  HUANG Jin-cong3
(1. Gansu Road & Bridge Construction Group, Lanzhou 730030, Gansu, China; 2. Gansu Tunnel Engineering Technology Research Center, Lanzhou 730030, Gansu, China; 3. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Keywords:
tunnel construction;  temporary support;  prefabricated structure;  numerical simulation
PACS:
TU94
DOI:
10.19815/j.jace.2022.03095
Abstract:
Aiming at the shortcomings of the current traditional temporary support of tunnels, a fully assembled vertical temporary support structure was independently developed and designed, which adopted the method of prefabricated modules + on-site assembly for construction. Four different schemes were compared and selected for the lateral support member and connection method, retaining plate and connection method, and top connection method of the supporting structure. Finally, horizontal plate lateral support + pin connection, baffle + T pin connection and bolt connection at the top were adopted respectively.Taking the Sangyuanzi tunnel as the background, the MIDAS/GTS numerical simulation software was used to compare and analyze the displacement of surrounding rock and the mechanical characteristics of the supporting structure of the tunnel using traditional arc support and new vertical temporary support in the part-step excavation construction. The measured data validated the simulation results. The results show that from the final displacement, it can be seen that the deformation of the vault under the two temporary support structures and the surrounding rock on the left and right walls are approximately the same. Compared with the arc temporary support, the settlement of the tunnel arch and the left and right arch waists with vertical temporary support is more uniform, and the control effect on the deformation of the tunnel arch bottom is also more obvious. The total deformation of the arc temporary support structure is 2.17 times larger than that of the vertical temporary support. Comparing the mechanical characteristics, it can be seen that the force effect of the vertical temporary support is better, and the maximum compressive stress is 29.88 times larger than that of the arc, thereby reducing the stress of the tunnel vault and vault bottom. Analysis of the displacement of the temporary support 24-step excavation shows that the vertical temporary support displacement of the first 20 steps of excavation is slightly larger than that of the arc temporary support. From step 21 to step 24, the displacement of the arc-shaped temporary support is larger than that of the vertical temporary support, indicating that the vertical temporary support structure has better self-stability, and the prefabricated temporary support structure adopts vertical shape is better, which can meet the construction requirements of the tunnel side heading method.

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Last Update: 2022-09-30