CN-121994654-A - Tunnel lining concrete self-adaptive damage evaluation method based on sulfate radical-rich effect

CN121994654ACN 121994654 ACN121994654 ACN 121994654ACN-121994654-A

Abstract

The invention provides a self-adaptive damage evaluation method of tunnel lining concrete based on sulfate-rich effect, which relates to the technical field of tunnel safety prevention and control, and the invention prepares experimental conditions according to the actual sulfate concentration range and temperature range of a tunnel, acquires a permeation model, simulates the sulfate permeation condition in a tunnel lining three-dimensional model, selects a point position with high permeation depth according to the simulation result for sampling observation, the simulation result is corrected, the correction of the simulation result by using the actual result is realized, meanwhile, the condition of the whole tunnel lining is judged by using the corrected simulation penetration depth, meanwhile, dangerous points are given, the sulfate radical penetration change condition of the lining in long-term use is considered, and meanwhile, the damage evaluation is completed by using a mode of combining deduction and field data.

Inventors

YANG PEIWEN
ZHONG ZULIANG
YANG ZHICHENG
BAO YANGYANG
SUN WEIZHE
WEI HAO
LIU XINRONG
ZHOU XIAOHAN

Assignees

中交路桥建设有限公司
重庆大学

Dates

Publication Date: 20260508
Application Date: 20251211

Claims (8)

1. The self-adaptive damage evaluation method for the tunnel lining concrete based on the sulfate-rich effect is characterized by comprising the following specific steps of: Step 1, obtaining sulfate radical concentration of each point in surrounding rock of a tunnel and obtaining a sulfate radical concentration range, obtaining a temperature change range of each section of the tunnel and forming a temperature range, performing a sulfate radical permeation test of a lining block in the sulfate radical concentration range and the temperature range, obtaining a change relation between permeation depth and sulfate radical concentration, temperature and duration, and calibrating the relation as a permeation model; Step 2, a tunnel lining three-dimensional model is established, sulfate radical concentration of each point position is marked in the tunnel lining three-dimensional model, sulfate radical concentration of other positions is marked through a difference method, temperature and duration of each position of a tunnel are obtained in real time, permeation simulation is carried out in a permeation model, and then the permeation simulation result is corrected according to the height of each position, so that simulation permeation depth of each position in the tunnel lining three-dimensional model is obtained; Step 3, obtaining each independent high-permeability zone in the permeability simulation, taking the position with the highest permeability value in each zone as a sampling point, and carrying out field sampling to obtain the actual permeability, and comparing and adjusting the simulated permeability of each position of the tunnel lining three-dimensional model according to the simulated permeability and the actual permeability; And 4, judging dangerous points with high values according to the adjusted simulated penetration depth, forming penetration scores according to the number and the values of the dangerous points and the simulated penetration depths of all the positions, setting a scoring threshold value, and alarming and providing the in-situ positions of the dangerous lines when the penetration scores exceed the scoring threshold value.
2. The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate-rich effect, which is disclosed in claim 1, is characterized in that the sulfate radical concentration of each point of the surrounding rock of the tunnel is obtained through address investigation, the sulfate radical concentration range of the tunnel is formed in a summarizing way, the upper limit of the sulfate radical concentration range is the highest sulfate radical concentration in the tunnel, and the lower limit is the lowest sulfate radical concentration in the tunnel; Meanwhile, the temperature range of the tunnel is obtained, and the logic of the temperature range is as follows: The method comprises the steps of uniformly dividing a tunnel into a plurality of tunnel sections according to the axial direction, obtaining the floating range of the temperature of each tunnel section in each season, taking the highest temperature in the floating ranges of all tunnel sections as the upper limit of the temperature range, and taking the lowest temperature in the floating ranges of all tunnel sections as the lower limit of the temperature range.
3. The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate-rich effect according to claim 2, wherein the same number of numerical points are respectively arranged in a sulfate concentration range and a temperature range, the difference value between two adjacent numerical points in the range is the same, a lining experimental block is arranged, experiments are respectively carried out under different sulfate concentration numerical points, different temperature numerical points and different time periods by an accelerated permeation method, the relation between the permeation quantity and the sulfate concentration, the temperature and the time period is solved, the permeation quantity is the permeation depth of sulfate ions, and a permeation model is obtained according to the following formula: Wherein, the The penetration depth is indicated as being the penetration depth, Represents the concentration of sulfate radical, The temperature is indicated as a function of the temperature, The duration of time is indicated and, Representing a functional formula.
4. The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate-rich effect as claimed in claim 3, wherein a three-dimensional tunnel lining model is established, the sulfate concentration of each point location is mapped to the three-dimensional tunnel lining model, and the logic is as follows: Marking all the points for obtaining the sulfate radical concentration in the tunnel lining three-dimensional model, marking corresponding sulfate radical concentration values, and marking the sulfate radical concentration at other positions of the tunnel lining three-dimensional model by a Kriging interpolation method.
5. The sulfate-rich effect-based tunnel lining concrete self-adaptive damage evaluation method according to claim 4, wherein cube meshing is performed in a tunnel lining three-dimensional model, then penetration simulation is performed through a penetration model, and the penetration simulation logic is as follows: The method comprises the steps of acquiring temperatures of all parts of a tunnel in real time, inputting the temperatures into a three-dimensional model of the tunnel lining, and resolving through a penetration model, wherein the time length is based on the actual time length from the establishment of the tunnel lining, acquiring the height of each cube grid of the tunnel lining from the bottom surface and the height of each cube grid of the tunnel lining from the bottom surface, and adjusting the penetration depth of each cube grid according to the following formula: Wherein, the Represent the first The simulated penetration depth of the individual cube grids, Represent the first The height of the square grid from the bottom surface, Representing the height of the highest point of the tunnel lining from the bottom surface, Representing the search variables of the square grid, , , Representing the total number of square grids.
6. The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate radical effect according to claim 5, wherein after the tunnel lining is operated for a period of time, the actual sulfate radical permeation condition of the tunnel lining is subjected to spot check, sampling points are selected according to permeation simulation, and the logic for acquiring the sampling points is as follows: Obtaining simulation penetration depth of each cube grid in penetration simulation, setting a high penetration threshold, carrying out communication analysis on cube grids exceeding the high penetration threshold to form mutually independent high penetration areas, and selecting the cube grid with the highest simulation penetration depth value in each high penetration area as a sampling point; And acquiring the actual position of each sampling point in the tunnel lining, and carrying out field sampling to acquire the actual penetration depth of each sampling point.
7. The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate-rich effect according to claim 6 is characterized in that the change rate of all sampling points is obtained according to the following formula: wherein, the The rate of change is indicated as being indicative of, Represent the first The actual penetration depth of the individual sampling points, Represent the first The simulated penetration depth of the individual sampling points, Representing the sample point retrieval variable, , , Representing the total number of sampling points; the penetration depth of each cube grid is adjusted according to the following formula: Wherein, the Indicating the simulated penetration depth after adjustment, Representing the simulated penetration depth before adjustment.
8. The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate radical effect according to claim 7, wherein the method is characterized in that the penetration depth of all the adjusted cube grids is obtained, a depth threshold value is set, cube grids with penetration depths exceeding the penetration threshold value in the penetration simulation are obtained and marked as dangerous points, and the penetration score of the sulfate radical of the lining is obtained according to the following formula: Wherein, the Represents the penetration score as well as the penetration score, Indicating the adjusted first Penetration depth of the individual square grids, Represent the first Penetration depth of the individual hazard points, A search variable representing a dangerous point, , , Indicating the total number of dangerous points, ; Setting a scoring threshold, alarming when the penetration score exceeds the scoring threshold, and simultaneously giving out penetration depth and positions of all dangerous points to remind of taking corresponding measures.

Description

Tunnel lining concrete self-adaptive damage evaluation method based on sulfate radical-rich effect Technical Field The invention relates to the technical field of tunnel safety prevention and control, in particular to a tunnel lining concrete self-adaptive damage evaluation method based on sulfate radical-rich effect. Background Tunnel engineering is applied in various harmful environments, wherein the most common is surrounding rock rich in sulfate ions, a large amount of sulfate ions enter tunnel lining of a tunnel under the influence of permeation, and as hydration products in the tunnel lining are generally concrete and react with the sulfate ions to generate expansive sulfate, the concrete body is expanded, cracked, strength is reduced and even structure is damaged, the damage not only shortens the service life of the tunnel, but also can cause potential safety hazards such as leakage, collapse and the like, and serious economic loss and engineering delay are caused, so that judging the permeation condition of the sulfate ions in the lining has important significance for the damage assessment of the tunnel lining. In the prior art, publication number CN120471453A discloses a gypsum rock tunnel water damage risk evaluation and prevention and control scheme selection method, which comprises the steps of 13, establishing a grading evaluation system based on parameters such as rock mass structural integrity, formation karst development degree, water enrichment, groundwater corrosiveness, gypsum rock mineral composition, expansibility and corrosion, dividing corresponding grades and determining an influence index R1R8, 4, respectively carrying out multidimensional weight calculation on subjective, objective and conflict influence indexes by an AHP method, an entropy weight method and a CRITIC method, correcting abnormal weights by combining expert experience and a check rule, generating comprehensive scores, dividing risk grades, matching grading prevention and control measures, and 5, dynamically judging and matching a construction method by the parameter risk grades, and optimizing and adjusting the prevention and control measures in real time. Although the disclosed technical document discloses a method for calculating the degree of invasion of a tunnel by surrounding rock, the method does not consider the influence of long-term change of the geological condition of the surrounding rock, the geological condition change is complex, the long-term change can be ignored by simple numerical calculation, and the combination of deduction and in-situ data is not realized. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to provide a tunnel lining concrete self-adaptive damage evaluation method based on sulfate-rich effect, so as to solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: The method for evaluating the self-adaptive damage of the tunnel lining concrete based on the sulfate radical-rich effect comprises the following specific steps: Step 1, obtaining sulfate radical concentration of each point in surrounding rock of a tunnel and obtaining a sulfate radical concentration range, obtaining a temperature change range of each section of the tunnel and forming a temperature range, performing a sulfate radical permeation test of a lining block in the sulfate radical concentration range and the temperature range, obtaining a change relation between permeation depth and sulfate radical concentration, temperature and duration, and calibrating the relation as a permeation model; Step 2, a tunnel lining three-dimensional model is established, sulfate radical concentration of each point position is marked in the tunnel lining three-dimensional model, sulfate radical concentration of other positions is marked through a difference method, temperature and duration of each position of a tunnel are obtained in real time, permeation simulation is carried out in a permeation model, and then the permeation simulation result is corrected according to the height of each position, so that simulation permeation depth of each position in the tunnel lining three-dimensional model is obtained; Step 3, obtaining each independent high-permeability zone in the permeability simulation, taking the position with the highest permeability value in each zone as a sampling point, and carrying out field sampling to obtain the actual permeability, and comparing and adjusting the simulated permeability of each position of the tunnel lining three-dimensional model according to the simulated permeability and the actual permeability; And 4, judging dangerous points with high values ac