Study on Disease Mechanism and Theoretical Quantification Method of Tunnel Structure

Abstract

Most tunnel structures tend to have different degrees of structural damage such as leakage, concrete cracking, lining salinization, and falling blocks after the operation for a period. Compared with the diversity of tunnel disease detection methods, there are few studies on the methods of quantifying and evaluating the main structural diseases of the lining. Based on the regular inspection data of expressway tunnels in Liaoning Province, this paper summarizes the distribution characteristics and laws of existing structural defects of tunnel lining. In addition, based on the in-depth study of the main structural diseases of the tunnel, the extenics theory is used to extract, quantify and classify several indicators that can accurately reflect the health status of the structure, and then establish the corresponding matter-element model to determine the weight of each indicator and the tunnel structure. The comprehensive correlation degree of disease grades is combined with the qualitative evaluation and quantitative research of lining structure diseases to construct a health evaluation system for tunnel lining structures, which is convenient for managers to make reasonable decisions. At the same time, combined with the actual test data of tunnel engineering, the calculation and analysis of the extension model are carried out to verify the engineering applicability of the model.

Health State Assessment of Road Tunnel Based on Improved Extension Cloud Model

“…Moreover, these diseases also threaten driving safety [6][7][8]. The evaluation indicators such as structure deformation, lining cracks, and water leakage are considered to set a tunnel evaluation index system [3,[9][10][11][12][13][14][15]. The health assessment model for tunnels is set based on methods that combined qualitative with quantitative such as the analytic hierarchy process method (AHP), entropy weight method, fuzzy comprehensive evaluation method, and the Bayesian network [9][10][11][12]15].…”

“…Sci. 2023, 13, 8554 2 of 14 In terms of constructing the health evaluation index system of tunnels, Liu et al [14] selected indicators such as leakage, lining cracks, and lining corrosion peeling to construct the health evaluation system for the tunnel lining structure. Chen et al [15] selected eight indicators from four aspects of structural deformation, lining cracks, spalling, and leakage, and evaluated the overall health status of tunnels using inspection data.…”

Inversion model for mechanical status of longitudinal joints in shield tunnel

“…1,2 This could cause convergence deformation of the tunnel, which leads to issues such as water leakage and concrete crushing at the joint position. [3][4][5] For example, when a large volume of 7-m-high soil was placed on the ground surface directly above the tunnel of Shanghai Metro Line 2, the resulting maximum convergence deformation of the tunnel reached up to 194 and 147 mm in the horizontal and vertical directions, respectively. In addition, severe structural damage occurred, including broken concrete segments, visibly exposed bolts, and heavy water leakage, which incurred high maintenance costs.…”

“…Owing to changes in the surrounding stress environment and the deterioration of structural materials in the long‐term operation period, the stress state of the tunnel and the stiffness of each joint can be significantly changed 1,2 . This could cause convergence deformation of the tunnel, which leads to issues such as water leakage and concrete crushing at the joint position 3–5 . For example, when a large volume of 7‐m‐high soil was placed on the ground surface directly above the tunnel of Shanghai Metro Line 2, the resulting maximum convergence deformation of the tunnel reached up to 194 and 147 mm in the horizontal and vertical directions, respectively.…”

Automatic Classification System of Drainage Hole Blockage Based on Convolution Neural Network Transfer Learning

“…With the continued extension of tunnels to mountains and o shore deepwater areas, a series of complex diseases have emerged in both tunnels under construction and in operation [1]. Severe crystal blockage of tunnel drainage pipes generally occurs during tunnel construction and operation.…”