|Table of Contents|

Evaluation method for health state of immersed tunnel structure in operation(PDF)

长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年1期
Page:
82-91
Research Field:
隧道工程
Publishing date:

Info

Title:
Evaluation method for health state of immersed tunnel structure in operation
Author(s):
WANG Zhi-feng1 CHEN Long-long1 WANG Ya-qiong1 LI Ke23 LI Jian-chong1
(1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. China Mechants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing 400067, China; 3. National Engineering Research Center of Highway Tunnel, Chongqing 400067, China)
Keywords:
tunnel engineering immersed tunnel health state of structure evaluation method fuzzy theory
PACS:
U457.2
DOI:
10.19721/j.cnki.1671-8879.2023.01.009
Abstract:
For the purpose of improving the accuracy and reliability of the evaluation of service status of immersed tunnel, a new evaluation method for health state of immersed tunnel was proposed, and triangular fuzzy theory and analytic hierarchy process was used. The evaluation index system of structural health state of immersed tunnel was constructed, according to the structural characteristics and main influencing factors of diseases of operating immersed tunnel. In this index system, six main factors were selected in the factor layer, such as structural cracks, leakage, structural degradation, structural stress, structural deformation and water environment. Fourteen indexes were selected in the index layer, such as crack length, crack width, leakage rate, leakage area, strength of concrete, loss rate of rebar cross-sectional area, rebar stress, concrete stress, horizontal shear key stress, vertical shear key stress, uneven settlement, joint opening, joint malposition and leakage water pH. The four grades classification standard of structural health status of operating immersed tunnel was established, and the characterization and health status evaluation value for evaluation index of each selected index was given. The deduction of calculation process of index weight and membership function of structural health evaluation was given. The absolute weight of each index and element in the health state evaluation index system of immersed tunnel structure and the membership degree corresponding to different levels of health state were obtained. The proposed evaluation method was applied to the calculation and analysis of engineering case, and it was compared with other methods. The results show that the calculated value of the health state comprehensive evaluation of the monitoring section of the immersed tunnel is 6.870, and the calculated value of membership degree is 0.935. The health status of tunnel structure belongs to grade Ⅰ(sound or minor damage). It is verified that the proposed evaluation method has good applicability in the health status evaluation of immersed tunnel compared with other methods.6 tabs, 4 figs, 27 refs.

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Last Update: 2023-01-30