CN-121660414-B - Grading treatment method for sludge flow surge sediment passing through bad alteration belt

CN121660414BCN 121660414 BCN121660414 BCN 121660414BCN-121660414-B

Abstract

The application belongs to the technical field of disaster prevention and reduction of tunnels and underground engineering, and particularly discloses a grading treatment method for sludge flow surge sediment passing through poor alteration, which comprises the steps of collecting information and parameters of a surge disaster site, carrying out danger grading on the sludge flow surge sediment based on the information and the parameters and a preset grading standard, adopting construction measures corresponding to danger grades to treat the sediment according to danger grading results, wherein direct dredging or sand bag back pressure treatment is adopted for the sludge with low danger grade, and at least one method of sectional grouting, sectional excavation, full-section grouting or prefabricated slurry stopping wall is adopted for treating the sludge with medium and high danger grade based on the critical length. The application can safely and efficiently treat sludge flow surge sediment in the tunnel passing through the bad alteration zone.

Inventors

ZHANG GUOHUA
WANG XINJIN
JIAO YUYONG
XIONG FENG
Hua Dongjie
Tu Fubin
ZOU JUNPENG
TAN FEI

Assignees

中国地质大学（武汉）

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (8)

1. A method for staged disposal of surge sludge from a through-the-poor-alteration tape sludge stream, comprising the steps of: S10, collecting information and parameters of a surge disaster site, wherein the information and parameters comprise the scale of residual substances, the form of siltation, the particle size of solid components, the water content, the water pressure condition of a surge section and the type of a poor geological structure; s20, carrying out danger classification on sediment after the surging of the mud flow based on the information, the parameters and the preset classification standard; S30, disposing the sediment by adopting construction measures corresponding to the dangerous grades according to the dangerous grading result, wherein the sediment with low dangerous grades is disposed by adopting direct dredging or sand bag back pressure, and the sediment with medium and high dangerous grades is disposed by adopting at least one method of sectional grouting, sectional excavation, full-section grouting or prefabricated grout stopping wall based on the critical length; in step S30, for sludge of medium-high risk level, the specific step of calculating the sludge cleaning critical length L 1 includes: S31, carrying out mechanical modeling on a tunnel penetrating through a poor geological zone; S32, dispersing the poor water-rich alteration zone into a series of nodes by a finite difference method, and calculating to obtain the osmotic force based on a Laplace equation; S33, calculating the back pressure of the weak band by combining stress analysis, and calculating the critical back pressure according to a searching method ; S34, based on the critical back pressure Calculating the sludge cleaning critical length L 1 according to the formula, wherein the formula is as follows: in the formula, In order to be a diameter of the tunnel, In order for the cohesive force to be a cohesive force, In order to achieve a density of the sludge, The acceleration of the gravity is that, In order to provide a coefficient of friction, Is the side pressure coefficient; the critical back pressure The calculation formula of (2) is as follows: in the formula, Constructing a recurrence relation for the load of a weak zone at the top of a tunnel to be excavated on a triangle potential sliding zone according to a stress balance equation of a disturbance zone, and carrying into a boundary condition to solve; To predict the weak band width; The horizontal osmotic force of the triangular area in front of the face before the gushing is achieved; Is the vertical osmotic force of the triangular area in front of the face before the gushing; in order to be the inclination angle, ; Is the friction angle; Is the triangle area in front of the face before gushing.
2. The method of claim 1, wherein in step S20, the preset grading criteria include a primary index and a secondary index, the primary index includes sludge, poor geology, and tunnel factors, the secondary index corresponding to sludge includes a scale of the sludge, a sludge form, a solid main component of the sludge, compactness, water content, and d 30 particle size range, the secondary index corresponding to poor geology includes type, dip angle, poor geology zone width, faults, karst, water pressure conditions, and groundwater level, and the secondary index corresponding to tunnel factors includes burial depth and cross-sectional area.
3. The method of staged treatment of through-the-poor alteration tape sludge flow surge sludge of claim 1, wherein the risk classification results in step S20 include stage I, stage II, stage III, stage IV and stage V, the low risk grades include stage I and stage II, and the medium and high risk grades include stage III, stage IV and stage V.
4. A method for staged disposal of sludge flow surge sediment passing through poor alteration area as defined in claim 3, wherein for the dangerous sediment of stage I, a direct sludge cleaning method is adopted, and a loader is used to clean the sediment in combination with manpower, and the principle of short footage and quick support is followed.
5. A method for classifying disposal of sludge flow surge sediment passing through bad alteration area as claimed in claim 3, wherein, for class II dangerous sediment, sand bag back pressure measures are adopted, in particular, sand bags are piled up on the surface of sediment to form a back pressure retaining wall, meanwhile, water permeable hoses are buried to guide accumulated water to be discharged, and after pore water pressure is dissipated and soil is solidified, the sediment is cleaned.
6. The method for classifying disposal of sludge flow surge sludge passing through bad alteration area as claimed in claim 3, wherein in step S30, at least one method of sectional grouting, sectional excavation, full section grouting and concrete casting slurry stopping wall sealing is adopted for dangerous sludge of class III, class IV and class V, and the water is discharged by matching with a pressure release hole, and the reserved length L is ensured to be smaller than the sludge cleaning critical length L 1 in the cleaning process.
7. A grading disposal system for treating sludge through bad alteration with sludge flow surge sediment is characterized in that, a step for implementing the method according to any one of claims 1 to 6, comprising: The parameter acquisition module is used for acquiring information and parameters of a surge disaster site, wherein the information and parameters comprise the scale of a residual material, the form of deposition, the particle size of solid components, the water content, the water pressure condition of a surge section and the type of a poor geological structure; the risk classification module is used for performing risk classification on sludge after the surging of the mud flow based on the information, the parameters and the preset classification standard; And the disposal decision module is used for generating a construction disposal scheme corresponding to the danger grade according to the danger grading result, wherein a direct dredging or sand bag back pressure scheme is generated for the low-danger grade, the sludge cleaning critical length is calculated for the medium-high-danger grade, and the disposal scheme comprising at least one method of sectional grouting, sectional excavation, full-face grouting or prefabricated grout stopping wall is generated based on the critical length.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1-6 when the program is executed.

Description

Grading treatment method for sludge flow surge sediment passing through bad alteration belt Technical Field The application belongs to the technical field of disaster prevention and reduction of tunnels and underground engineering, and particularly relates to a grading treatment method for sludge flow surge sediment passing through poor alteration. Background Along with the extension of national major infrastructure networks such as traffic, water conservancy and the like to deep mountain canyons and complex geological areas, tunnel engineering construction inevitably needs to pass through bad geological bodies such as fault fracture zones, hydrothermal alteration zones and the like. Such altered belt rock mass structure is broken, the cementing degree is poor, and geological disasters such as water bursting and mud bursting (mud chip flow) are extremely easy to induce along with high-pressure rich water environment. After the disaster occurs, a large amount of mud and debris flow sediment is often accumulated in the tunnel, so that a construction channel is blocked, and the subsequent rescue and reworking processes are more severely restricted. Currently, engineering practices remain a serious challenge for the disposal of such post-surge sludge. The sediment after the surging plays a role of temporary passive support and 'choke plug' on the tunnel face opening to a certain extent, but under the seepage-stress coupling effect, if the sediment is dredged, the existing temporary balance state is easily damaged, and secondary surging disasters such as soil flowing, piping and even whole sliding are caused. Meanwhile, the existing dredging operation depends on engineering analogy or experience judgment, a quantitative calculation model capable of comprehensively considering multiple factors such as the type of the changed rock, the water pressure, the particle size of the sediment, the compactness and the like is lacking, the safety critical length of single dredging is difficult to accurately judge, and the construction is often unstable due to excessive dredging or the construction period is delayed due to excessive conservation. In addition, due to the lack of unified risk classification and matching standards for sediments with different scales and properties, the selection of the existing treatment means such as direct grouting, slurry stopping wall or back pressure often lacks scientific basis, the situation that accidents are replayed due to insufficient reinforcement or resources are wasted due to excessive reinforcement is extremely easy to occur, and the engineering requirements of post-disaster safety and high-efficiency rescue are difficult to meet. Therefore, how to safely and efficiently treat sludge flow surge sludge in a through-bad-alteration-zone tunnel is a current urgent problem to be solved. Disclosure of Invention Aiming at the defects of the prior art, the application aims to provide a grading treatment method for sludge flow surge sediment passing through a poor alteration belt tunnel, which can safely and efficiently treat the sludge flow surge sediment passing through the poor alteration belt tunnel. To achieve the above object, in a first aspect, the present application provides a method for classifying disposal of a surge sludge passing through a poor alteration tape sludge stream, comprising the steps of: S10, collecting information and parameters of a surge disaster site, wherein the information and parameters comprise the scale of residual substances, the form of siltation, the particle size of solid components, the water content, the water pressure condition of a surge section and the type of a poor geological structure; s20, carrying out danger classification on sediment after the surging of the mud flow based on the information, the parameters and the preset classification standard; And S30, disposing the sediment by adopting construction measures corresponding to the dangerous grades according to the dangerous grading result, wherein the sediment with low dangerous grades is disposed by adopting direct dredging or sand bag back pressure, and the sediment with medium and high dangerous grades is disposed by adopting at least one method of sectional grouting, sectional excavation, full-section grouting or prefabricated grout stopping wall based on the critical length after calculating the critical length of the sediment cleaning. As a further preferred aspect, in step S20, the preset grading criteria include a primary index and a secondary index, the primary index includes a sediment, a poor geology, and a tunnel factor, the secondary index corresponding to the sediment includes a sediment scale, a sediment form, a sediment solid main component, a compactness, a water content, and a d 30 particle size range, the secondary index corresponding to the poor geology includes a type, an inclination angle, a poor geological zone width, a fault, a karst, a water pressure condition, and