CN-121993229-A - Synergistic heat-resistant and self-adaptive damping method for high-rock-temperature fault tunnel

Abstract

The application provides a collaborative heat resistance and self-adaptive damping method of a high-rock-temperature fault tunnel, which comprises the following steps of establishing a three-dimensional surrounding rock model of a tunnel corridor, outwards expanding a set range by taking a tunnel axis as a center to form a three-dimensional space to be analyzed, providing a plurality of three-dimensional units which are regularly arranged, respectively endowing each three-dimensional unit with mechanical contribution degree and thermal damage risk degree based on geological investigation data, marking a functional area of each three-dimensional unit according to a preset thermal coupling discriminant criterion based on the mechanical contribution degree and the thermal damage risk degree, generating a three-dimensional grouting functional partition map based on a marking result, and guiding differentiated grouting construction aiming at different functional areas.

Inventors

• WANG DAOYUAN
• YUAN JINXIU
• WANG DAPENG
• YUN KAI
• AN CHENLIANG
• MA JIWEN
• Lv Zhenjia
• YANG XIAOHUI
• TIAN XIAOLU
• Song baolu
• LI WENGUANG
• HUI YUNJIE

Assignees

• 河北交通职业技术学院
• 中铁十六局集团第四工程有限公司
• 宁夏城际铁路有限责任公司
• 中铁十六局集团有限公司
• 中铁十八局集团第五工程有限公司
• 中铁十八局集团有限公司

Dates

Publication Date

20260508

Application Date

20260127

Claims (10)

1. 1. The synergistic heat-resistant and self-adaptive damping method for the high-rock-temperature fault tunnel is characterized by comprising the following steps of: establishing a three-dimensional surrounding rock model of a tunnel gallery, and expanding a set range outwards by taking a tunnel axis as a center to form a three-dimensional space to be analyzed, wherein the three-dimensional space is provided with a plurality of three-dimensional units which are regularly arranged; based on geological survey data, respectively endowing each three-dimensional unit with a mechanical contribution degree and a thermal injury risk degree; According to a preset thermodynamic coupling criterion, marking a functional area of each three-dimensional unit based on the mechanical contribution degree and the thermal damage risk degree, wherein the functional area comprises a skeleton area or a heat insulation area; and generating a three-dimensional grouting functional partition map based on the marking result, wherein the map is used for guiding the differentiated grouting construction aiming at different functional areas.
2. 2. The method for collaborative heat resistance and self-adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 1, wherein the step of marking a functional area of each three-dimensional unit based on the mechanical contribution degree and the thermal damage risk degree according to a preset thermodynamic coupling criterion includes the following steps: judging whether each three-dimensional unit is positioned on a preset main stress transmission path according to the mechanical contribution degree of the three-dimensional unit; Marking three-dimensional units which are positioned on the main stress transmission path and have the heat damage risk degree lower than a first threshold value as skeleton areas; Marking a three-dimensional unit located outside the principal stress transfer path and having the thermal hazard risk level higher than a second threshold as a thermally insulated zone; wherein the second threshold is greater than the first threshold.
3. 3. The method for collaborative heat resistance and self-adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 2, wherein the determining whether each three-dimensional unit is located on a preset main stress transmission path according to the mechanical contribution degree of the unit comprises the following steps: Based on thermodynamic coupling dynamics simulation, calculating the time-course stress state and the energy flow density of each three-dimensional unit under the combined action of a preset earthquake load spectrum and an actual surrounding rock temperature field; Identifying a unit path which is higher than a third threshold value and is continuous in space in the three-dimensional surrounding rock model according to the time-course stress state and the energy flow density; And judging that the three-dimensional unit positioned on the unit path is positioned on the preset main stress transmission path.
4. 4. The method for collaborative heat resistance and self-adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 3, further comprising the steps of, prior to the generating of the three-dimensional grouting functional partition map: Identifying all three-dimensional units marked as the skeleton region, and constructing an initial network model of the skeleton region in a three-dimensional space; identifying an interruption area and/or an isolated unit in the initial network model based on a preset connectivity criterion, wherein the isolated unit is a three-dimensional unit marked as the skeleton area in an isolated manner; Based on the mechanical contribution degree and/or the thermal damage risk degree of the three-dimensional units, and combining the preset main stress transmission path, re-evaluating and adjusting the functional area mark of at least one three-dimensional unit in the neighborhood range of the interrupt area and/or the isolated unit to enable the functional area mark to be complemented and marked as a skeleton area; The optimized skeleton region forms a continuous through reinforced force transmission network in the three-dimensional space through iterative or one-time adjustment.
5. 5. The method for collaborative heat resistance and self-adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 1, further comprising the following steps after generating a three-dimensional grouting functional partition map: determining the corresponding target grouting material type and target grouting pressure according to the functional area of each three-dimensional unit in the grouting functional area map; Generating grouting construction information matched with a unit grid of the three-dimensional surrounding rock model, wherein the grouting construction information comprises a position code of each three-dimensional unit, the corresponding target grouting material type and the target grouting pressure; wherein the target sizing material type at least comprises high-strength early strength sizing for the framework region and flexible phase change thermal insulation sizing for the thermal insulation region.
6. 6. The method for collaborative heat resistance and self-adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 1, wherein each three-dimensional unit is respectively assigned with a mechanical contribution degree and a thermal injury risk degree based on geological survey data, comprising the following steps: Respectively generating a three-dimensional continuous mechanical attribute field and a three-dimensional continuous thermophysical attribute field which cover the three-dimensional surrounding rock model based on drilling rock core strength test data, rock mass structural plane distribution data, ground temperature measurement data and thermal conductivity test data in geological investigation data; Separately quantifying contributions of each of the three-dimensional units based on energy flow analysis and heat flow analysis: for each three-dimensional unit, extracting the elastic modulus and poisson ratio of the three-dimensional continuous mechanical property field, carrying out local energy flow density calculation based on a preset seismic load spectrum, and taking the normalized energy flow density value as the mechanical contribution degree of the three-dimensional unit; And for each three-dimensional unit, extracting the thermal conductivity and the initial ground temperature of the three-dimensional continuous thermophysical property field, performing steady-state thermal conduction simulation based on the boundary condition of the tunnel design temperature, calculating the heat flux density of the unit pointing to the tunnel free surface, and taking the normalized heat flux density value as the heat damage risk degree of the unit.
7. 7. The method for collaborative heat resistance and adaptive damping for a Gao Yanwen fault tunnel according to claim 4, wherein the predetermined connectivity criteria is a functional efficiency-based network connectivity criteria; Before identifying an outage region and/or an isolated unit in the initial network model, establishing a network performance assessment model for the initial network model, wherein: each three-dimensional unit marked as a skeleton region is regarded as a network node, and the connection between adjacent skeleton region units is regarded as an edge; And giving a comprehensive force transmission efficiency coefficient to each side, wherein the comprehensive force transmission efficiency coefficient is determined by a mechanical contribution degree mean value and a thermal damage risk degree difference value of two units connected with the side and the consistency of the side direction and the preset main stress transmission path direction.
8. 8. The method for collaborative thermal and adaptive damping of a Gao Yanwen fault tunnel according to claim 7, wherein the identifying of outage regions and/or isolated cells in the initial network model based on a pre-set connectivity criteria includes the steps of: Based on the network performance evaluation model and graph theory algorithm, two types of key defects are identified in the initial network model: An isolated node, the comprehensive force transmission efficiency coefficient of all adjacent sides of which is lower than a first efficiency threshold, is defined as the isolated unit; The comprehensive force transmission efficiency coefficient is lower than the second efficiency threshold, and the edge which plays a key role in maintaining the overall connectivity of the network in terms of the topology is defined as the interruption area by the edge and the associated units.
9. 9. The method for collaborative heat resistance and adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 4, wherein the re-evaluating and adjusting the functional area mark of at least one three-dimensional unit within the neighborhood of the break area and/or isolated unit based on the mechanical contribution degree and/or thermal damage risk degree of the three-dimensional unit and in combination with the preset main stress transfer path to make the functional area mark be complemented as a skeleton area comprises the following steps: Defining a three-dimensional neighborhood by taking the interruption area or the isolated unit as a center, and constructing a repair search space containing all candidate units which are not marked as skeleton areas; Establishing a repair objective function, and comprehensively evaluating the improvement amplitude of the overall force transmission efficiency of the framework region network, the newly increased heat damage risk and the increase degree of the network structure complexity after marking any candidate unit as the framework region; based on the repair objective function, performing iterative optimization in the repair search space until candidate unit combinations meeting preset repair conditions are found; And complementarily marking the candidate units in the candidate unit combination as skeleton areas.
10. 10. The method for collaborative heat resistance and self-adaptive vibration reduction of Gao Yanwen fault tunnels according to claim 9, wherein the repair objective function is a multi-objective optimization function and the preset repair condition is a pareto optimal condition; The iterative optimization is performed in the repair search space, and the method comprises the following steps: searching a candidate unit combination which reaches pareto optimal on three targets of overall force transmission efficiency, newly increased heat damage risk and network structure complexity based on a multi-target evolutionary algorithm.

Description

Synergistic heat-resistant and self-adaptive damping method for high-rock-temperature fault tunnel Technical Field The application relates to the technical field of tunnel construction, in particular to a synergistic heat-resistant and self-adaptive damping method for a high-rock-temperature fault tunnel. Background In Gao Yanwen fault tunnel engineering, heat damage and vibration damage are mutually coupled and jointly act to form a very complex engineering treatment environment, and the core contradiction is that the heat damage effect is that the high-temperature environment of tunnel surrounding rock can obviously reduce the mechanical properties (such as strength and elastic modulus) and durability of most traditional supporting materials and grouting materials, so that the supporting materials are more easily damaged and failed under the ground vibration load, and the safety reserve is greatly reduced. The energy-force superposition, namely the superposition of the energy input by earthquake and the thermal stress of surrounding rock due to high temperature on the structure, forms the dual load function of combining dynamic state and static state, forms serious threat to the safety of the supporting structure, and is difficult to deal with by the traditional single disaster fortification standard. The rigid reinforcement measures (such as high-strength concrete lining and dense steel frame) adopted for earthquake resistance are easy to generate temperature cracks under the action of continuous thermal stress, the integrity of the support system is damaged, and the flexible heat insulation layer or the light material arranged for heat resistance weakens the integral rigidity and the continuity of the support system and can become a weak link in the earthquake. The prior art lacks an integrated method for realizing the performance synergy and the space adaptation of the surrounding rock reinforcement source, so that the treatment measures are mutually restricted, and the overall efficiency is low. Disclosure of Invention In view of the above-mentioned drawbacks or shortcomings in the prior art, the present application is directed to a synergistic heat-blocking and adaptive shock-absorbing method for a high-rock-temperature fault tunnel, comprising the steps of: establishing a three-dimensional surrounding rock model of a tunnel gallery, and expanding a set range outwards by taking a tunnel axis as a center to form a three-dimensional space to be analyzed, wherein the three-dimensional space is provided with a plurality of three-dimensional units which are regularly arranged; based on geological survey data, respectively endowing each three-dimensional unit with a mechanical contribution degree and a thermal injury risk degree; According to a preset thermodynamic coupling criterion, marking a functional area of each three-dimensional unit based on the mechanical contribution degree and the thermal damage risk degree, wherein the functional area comprises a skeleton area or a heat insulation area; and generating a three-dimensional grouting functional partition map based on the marking result, wherein the map is used for guiding the differentiated grouting construction aiming at different functional areas. According to the technical scheme provided by the application, the functional area marking is carried out on each three-dimensional unit based on the mechanical contribution degree and the thermal damage risk degree according to the preset thermodynamic coupling discriminant criterion, and the method comprises the following steps: judging whether each three-dimensional unit is positioned on a preset main stress transmission path according to the mechanical contribution degree of the three-dimensional unit; Marking three-dimensional units which are positioned on the main stress transmission path and have the heat damage risk degree lower than a first threshold value as skeleton areas; Marking a three-dimensional unit located outside the principal stress transfer path and having the thermal hazard risk level higher than a second threshold as a thermally insulated zone; wherein the second threshold is greater than the first threshold. According to the technical scheme provided by the application, the method for judging whether each three-dimensional unit is positioned on a preset main stress transmission path according to the mechanical contribution degree of the three-dimensional unit comprises the following steps: Based on thermodynamic coupling dynamics simulation, calculating the time-course stress state and the energy flow density of each three-dimensional unit under the combined action of a preset earthquake load spectrum and an actual surrounding rock temperature field; Identifying a unit path which is higher than a third threshold value and is continuous in space in the three-dimensional surrounding rock model according to the time-course stress state and the energy flow density; And judging that t