|Table of Contents|

Design Optimization and Evaluation of Air Shaft Enclosure Structure of a Subway Tunnel in Nanning(PDF)

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

Issue:
2021年06期
Page:
197-203
Research Field:
软土隧道施工与变形控制
Publishing date:

Info

Title:
Design Optimization and Evaluation of Air Shaft Enclosure Structure of a Subway Tunnel in Nanning
Author(s):
KANG Ya-le
(Shaanxi Railway and Underground Traffic Engineering Key Laboratory, China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China)
Keywords:
deep foundation;  enclosure structure;  design optimization;  common deformation;  structural integrity
PACS:
TU442
DOI:
10.19815/j.jace.2021.08043
Abstract:
The enclosure structure of deep foundation pit in traditional design methods is usually calculated by section, so the overall action of the structure can not be considered, and the working deformation of the surrounding rock of the structure is ignored. It is easy to cause such phenomena as extremely large section of design structure, thick size of ground connecting wall of enclosure structure, large section of concrete support, and cause great waste. To solve these problems, based on the fan room shaft enclosure project in a section of Nanning rail transit, FLAC 3D software was used to complete the numerical simulation modeling. Considering the structural integrity and the common deformation conditions of structure and surrounding rock, the scheme of diaphragm wall and support system used in the project was optimized. The thickness of diaphragm wall was reduced by 33.33%, and the area of longitudinal stressed reinforcement was reduced by 22.36%. On the basis, the safety and economy of the optimization scheme were further systematically evaluated. The results show that the engineering parameters of the optimization scheme can well meet the specification requirements. Compared with the traditional design scheme, the optimization scheme can reduce the existing total construction cost by 12.37%. The research conclusion has significant engineering economic significance, and can provide reference for the design and optimization of deep foundation pit retaining structure in similar projects.

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Last Update: 2021-11-01