CN111738495A - Underground engineering water inrush disaster prediction and mutual feedback regulation and control method and system - Google Patents
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Abstract
The invention discloses a method and a system for predicting and controlling an underground engineering water inrush disaster through mutual feedback, which comprises the following steps: predicting the risk of the sudden water inrush disaster according to the geological conditions of the underground engineering; performing mechanical evaluation on the inrush water disaster based on the rock mass fracture criterion; establishing a safety coefficient contour map of the outburst-prevention rock mass, and dynamically predicting the water inrush disaster; and providing a scheme for avoiding and regulating the sudden water disaster according to key factors and control parameters in the sudden water disaster changing process, and realizing disaster regulation and control.
Description
Technical Field
The invention belongs to the technical field of underground engineering disaster prevention and control, and particularly relates to an underground engineering water inrush disaster prediction and cross feed regulation and control method and system.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Underground works relate to important engineering fields such as traffic engineering (railways, highway tunnels), hydraulic and hydroelectric engineering (water delivery tunnels, underground powerhouses) and the like, along with the gradual transfer of the gravity center of underground engineering construction to the middle and western areas with a large amount of karst, fault, tectonic zones and other unfavorable geology, the disaster problems of karst water burst, collapse, rockburst and the like encountered in the engineering construction are increased day by day, and the construction period delay and the economic loss are easily caused. Because the regional geological conditions and the construction process of the engineering have obvious uncertainty, how to reasonably predict and evaluate the risk of disaster occurrence and carry out effective management, prevention and control become the key for ensuring the safe construction of underground engineering.
The acquisition and analysis of characteristic information and the capture of precursor information in the disaster inoculation and evolution process are important prerequisites for disaster prediction. The inventor finds that for prediction of water inrush disaster of underground engineering, perception of disaster precursor information in construction period is focused on analyzing macroscopic precursor characteristics of water inrush from geological, hydrological and construction angles; the risk assessment method mainly depends on geological conditions and hydrogeological information, a prediction method including pre-disaster multi-physical-field information is not established, and the accuracy rate and the universality are low. For the prevention and control of the sudden water inrush disaster, effective dynamic feedback analysis, regulation and control methods and regulation and control measures are not available.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for forecasting and mutually feeding regulation and control of water inrush disasters in underground projects, which solve the defect that the prior art does not consider mechanical factors and multi-physical-field factors, establish a water inrush disaster forecasting method integrating geological judgment, mechanical judgment and multi-physical-field judgment, and establish a disaster regulation and feedback integrated control method taking deformation and seepage control as the core.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for predicting an underground engineering water inrush disaster and adjusting and controlling cross feed, including the following steps:
(1) forecasting the risk of the sudden water gushing disaster based on the macro geological analysis: predicting the risk of the sudden water inrush disaster according to the geological conditions of the underground engineering;
selecting main induction factors of the water inrush disaster, establishing a macro-geological evaluation index system and a grading standard for predicting the risk of the underground engineering water inrush disaster, and quantitatively evaluating and predicting the risk level of the water inrush disaster by adopting a risk evaluation method such as an attribute interval, fuzzy mathematics and the like according to engineering geological and hydrogeological conditions of an area where the underground engineering is located, such as occurrence development and spatial distribution characteristics of bad geology such as karst and tectonic zones, underground water circulation mode, runoff replenishment conditions and the like.
(2) And (3) sudden water inrush disaster mechanical evaluation based on rock mass fracture criteria: performing mechanical evaluation on the inrush water disaster based on the rock mass fracture criterion;
according to the geometrical characteristics of cracks of fractured rock masses and stress states (ground stress, water pressure, dynamic load, included angles between the cracks and the maximum principal stress) on crack surfaces, whether the outburst-prevention rock masses are damaged under the action of dynamic disturbance and unloading is judged based on rock mass compression-shear damage criteria, and therefore the outburst water disaster is induced.
(3) Forecasting the water inrush disaster based on multi-physical field information evolution: establishing a safety coefficient contour map of the outburst-prevention rock mass, and dynamically predicting the water inrush disaster;
and (3) establishing a sudden gushing prevention rock mass safety coefficient contour map based on the space distribution rule of the stress field and the seepage field of the adjacent area after the underground engineering is excavated and by combining the sudden gushing water disaster mechanical evaluation method in the step (2). Meanwhile, based on the evolution rule of the multi-physical field information along with the engineering excavation, the distribution characteristics of the multi-physical field information in front are predicted by utilizing the multi-physical field information of the excavated section, and the outburst-prevention rock mass safety coefficient contour map is dynamically predicted and corrected, so that the dynamic prediction of the water burst disaster is realized.
(4) The underground engineering water inrush disaster information mutual feedback and regulation method comprises the following steps: and providing a scheme for avoiding and regulating the sudden water disaster according to key factors and control parameters in the sudden water disaster changing process, and realizing disaster regulation and control.
According to key factors and control parameters of the underground engineering water inrush catastrophe process, based on the influence rule of factors such as underground water pressure, rock mass properties, design schemes, construction methods, support systems and the like on the stability and seepage field of surrounding rocks, the scheme for avoiding and regulating the water inrush disaster is provided: if the underground water pressure is reduced through drainage and pressure relief, the stability of the outburst-prevention rock mass is improved through grouting reinforcement, engineering disturbance is reduced through construction scheme optimization, stress field and seepage field distribution characteristics are changed, and the rock mass which is possibly cracked originally is in a safe state, so that high-pressure water inrush disasters are reduced or avoided, and disaster regulation and control are realized.
The key factors and control parameters comprise underground water pressure, cohesive force of a crack surface, an internal friction angle on the crack surface, ground stress and seepage field distribution characteristics.
In a second aspect, an embodiment of the present invention further provides a system for predicting an underground engineering water inrush disaster and controlling feedback, including:
the prediction module is used for predicting the risk of the sudden water inrush disaster according to the geological conditions of the underground engineering;
the evaluation module is used for carrying out mechanical evaluation on the inrush water disaster based on the rock mass fracture criterion;
the prediction module is used for dynamically predicting the water inrush disaster by establishing a safety coefficient contour map of the outburst-prevention rock mass;
and the regulation and control module is used for providing a scheme for avoiding and regulating the sudden water disaster according to key factors and control parameters in the sudden water disaster change process so as to realize disaster regulation and control.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
compared with the prior art, the inrush water disaster prediction method integrating geological evaluation, mechanical evaluation and multi-physical-field evaluation factors solves the problems that the traditional inrush water disaster risk assessment method only considers the geological evaluation factors and is low in accuracy and universality.
Meanwhile, the influence rule of strong power disturbance and excavation unloading action on the outburst-prevention rock mass rupture criterion and the safety coefficient is considered, the distribution characteristics of front multi-physical fields can be predicted by utilizing multi-field information of an excavated section, the safety coefficient contour map of the outburst-prevention rock mass is dynamically corrected, and dynamic regulation and feedback regulation of the water inrush disaster are realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic flow chart of a method for predicting and cross-feeding regulation and control of an underground engineering water inrush disaster according to one or more embodiments of the present invention;
FIG. 2a is a schematic view of a crack surface in a press-shear state;
FIG. 2b is a schematic diagram of a fracture surface in a shear state;
FIG. 3 is a schematic diagram of stress field spatial distribution;
FIG. 4 is a schematic diagram of the evolution of stress field information;
fig. 5 is a schematic view of regulation and control of a sudden water disaster.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention should be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced by the background art, the defects exist in the prior art, and in order to solve the technical problems, the invention provides a method and a system for predicting and cross-feed regulating and controlling the water inrush disaster in the underground engineering, which establish key control factors and optimal control opportunities for effectively judging different evolution stages of the water inrush disaster, provide guidance for active prevention and control of the disaster, and have important scientific significance and engineering application value.
In a typical embodiment of the present invention, as shown in fig. 1, a method for predicting and cross-feed regulating and controlling a water inrush disaster in an underground engineering is provided, which includes the following steps:
(1) forecasting the risk of the sudden water inrush disaster based on the macroscopic geological analysis;
the method comprises the steps of selecting main induction factors of the water inrush disaster, such as development characteristics and spatial distribution of unfavorable geological structures, stratum lithology, underground water level, underground water circulation modes and the like, and establishing a macro-geological evaluation index system and a grading standard for predicting the risk of the water inrush disaster in the underground engineering, wherein the macro-geological evaluation index system and the grading standard are shown in table 1.
TABLE 1 macroscopic geology evaluation index system and grading standard for inrush water in underground works
And (3) according to engineering geology and hydrogeology conditions of the area where the underground engineering is located, such as unfavorable geology occurrence development and spatial distribution characteristics of karst, tectonic zone and the like, underground water circulation mode, runoff replenishment conditions and the like, carrying out quantitative evaluation and prediction on the risk level of the sudden water inrush disaster by adopting a risk evaluation method of attribute interval, fuzzy mathematics and the like.
Attribute interval and fuzzy mathematics belong to the existing known risk assessment method, and are not described herein again.
(2) Judging the mechanics of the sudden water inrush disaster based on the rock mass fracture criterion;
according to the geometrical characteristics of the fractured rock mass cracks and the stress state (ground stress, water pressure, dynamic load, the included angle between the cracks and the maximum principal stress) on the fracture surface, as shown in fig. 2a and 2 b. The water-containing crack length is 2a and the stress sigma is near zone1And σ3Action, cracks and ground stress sigma1the included angle of the direction is α, and the pressure P of pore water in the crack iswThe crack is simultaneously subjected to a stress wave P wave (or S)VWaves).
And (3) judging whether the outburst-prevention rock mass is damaged under the action of dynamic disturbance and unloading based on rock mass compression-shear damage criteria (formula (1) -formula (2)), so as to induce the outburst water disaster.
when the influence of dynamic wave is not considered, the critical water pressure P of crack generation pressure shear damagec：
In the formula:
is the internal friction angle on the crack face, KIICThe fracture toughness value is II type of the rock compression state.
② when considering dynamic wave influence, critical water pressure P of crack generation pressure shear damagec：
In the formula:
is a dynamic stress intensity factor; τ is the shear stress; c is the cohesion of the crack face.
When pore water pressure P on the crack surfacewCalculated value P exceeding formula (1) to formula (2)cIn time, the rock mass is crushed and damaged to induce the sudden water burst disaster; otherwise, the rock mass can not be subjected to compression shear damage.
(3) Forecasting the water inrush disaster based on multi-physical field information evolution;
based on the spatial distribution rule of the stress field and the seepage field of the adjacent area after the underground engineering is excavated, as shown in figure 3; and (3) calculating the safety coefficient of any outburst-prevention rock mass in the engineering disturbance area by combining the mechanical evaluation method for the outburst water disaster in the step (2), and drawing the contour map of the outburst-prevention rock mass according to the safety coefficient. The safety coefficient of the outburst-prevention rock mass is defined as:
fs＝Pw/Pc(3)
meanwhile, based on the evolution rule of the multi-physical field information along with the engineering excavation, as shown in fig. 4, the distribution characteristics of the multi-physical field information in front are predicted by using the multi-field information of the excavated section, and the safety coefficient of the outburst-prevention rock mass is predicted and corrected, so that the dynamic prediction of the water inrush disaster is realized.
(4) An underground engineering water inrush disaster information mutual feedback and regulation method;
according to key factors and control parameters of the underground engineering water inrush catastrophe process, based on the influence rule of factors such as underground water pressure, rock mass properties, design schemes, construction methods, support systems and the like on the stability and seepage field of surrounding rocks, the scheme for avoiding and regulating the water inrush disaster is provided:
for example, by reducing the groundwater pressure P by hydrophobic pressure reliefwImproving the stability of outburst-proof rock mass through grouting reinforcement
Optimized through construction schemeLow engineering disturbance, changing stress field (sigma)1And σ3) And the seepage field (P)w) Distribution characteristics and the like, improve the safety coefficient, and make the rock mass that probably breaks originally be in safe state to reduce or avoid high pressure gushing water disaster, realize disaster regulation and control.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for forecasting and cross-feed regulating and controlling water inrush disasters of underground projects is characterized by comprising the following steps:
predicting the risk of the sudden water inrush disaster according to the geological conditions of the underground engineering;
performing mechanical evaluation on the inrush water disaster based on the rock mass fracture criterion;
establishing a safety coefficient contour map of the outburst-prevention rock mass, and dynamically predicting the water inrush disaster;
and providing a scheme for avoiding and regulating the sudden water disaster according to key factors and control parameters in the sudden water disaster changing process, and realizing disaster regulation and control.
2. The method for forecasting the inrush water disaster and adjusting and controlling the mutual feedback of the underground engineering as claimed in claim 1, wherein the step of forecasting the inrush water disaster risk comprises the following steps:
selecting main induction factors of the water inrush disaster, establishing a macro-geological evaluation index system and a grading standard for predicting the risk of the underground engineering water inrush disaster, and quantitatively evaluating and predicting the risk grade of the water inrush disaster by adopting a risk evaluation method of attribute intervals and fuzzy mathematics according to the engineering geological and hydrogeological conditions of the region where the underground engineering is located.
3. The method as claimed in claim 2, wherein the main inducing factors include the development characteristics and spatial distribution of unfavorable geological structures, the lithology of strata, the groundwater level, and the groundwater circulation mode; the engineering geology and hydrogeology conditions comprise karst and tectonic zones with unfavorable geology occurrence development and spatial distribution characteristics, underground water circulation modes and runoff replenishment conditions.
4. The method for forecasting the inrush water disaster and adjusting and controlling the mutual feedback of the underground engineering as claimed in claim 1, wherein the step of performing the mechanical evaluation of the inrush water disaster comprises the following steps:
according to the geometrical characteristics of the cracks of the fractured rock mass and the stress state on the crack surface, whether the outburst-prevention rock mass is damaged under the action of dynamic disturbance and unloading is judged based on rock mass compression-shear damage criteria, so that the outburst water disaster is induced.
5. The method for predicting and controlling the mutual feedback of the inrush water disaster in the underground engineering as claimed in claim 4, wherein the criteria for breaking the rock mass by compression and shear are as follows:
critical water pressure P for crack generation and shear failure when dynamic wave influence is not consideredc：
In the formula:
is the internal friction angle on the crack face, KIICThe fracture toughness value is II type fracture toughness value of the rock in a compressed state;
when pore water pressure P on the crack surfacewExceeds the calculated value PcIn time, the rock mass is crushed and damaged to induce the sudden water burst disaster; otherwise, the rock mass can not be subjected to compression shear damage.
6. The method for predicting and controlling the mutual feedback of the inrush water disaster in the underground engineering as claimed in claim 4, wherein the criteria for breaking the rock mass by compression and shear are as follows:
critical water pressure P for crack generation shear failure when dynamic wave influence is consideredc：
In the formula:
is a dynamic stress intensity factor; τ is the shear stress; c is the cohesive force of the crack surface;
when pore water pressure P on the crack surfacewExceeds the calculated value PcIn time, the rock mass is crushed and damaged to induce the sudden water burst disaster; otherwise, the rock mass can not be subjected to compression shear damage.
7. The method for forecasting the inrush water disaster and adjusting and controlling the mutual feedback of the underground engineering as claimed in claim 1, wherein the step of dynamically forecasting the inrush water disaster comprises:
establishing a outburst-prevention rock mass safety coefficient contour map based on the spatial distribution rule of a stress field and a seepage field of an area where the underground engineering is excavated and combining with the mechanical evaluation of the inrush water disaster; meanwhile, based on the evolution rule of the multi-physical field information along with the engineering excavation, the distribution characteristics of the multi-physical field information in front are predicted by utilizing the multi-physical field information of the excavated section, and the outburst-prevention rock mass safety coefficient contour map is dynamically predicted and corrected, so that the dynamic prediction of the water burst disaster is realized.
8. The method as claimed in claim 1, wherein the key factors and control parameters include groundwater pressure, cohesive force of crack surface, internal friction angle on crack surface, ground stress, and seepage field distribution characteristics.
9. The method for forecasting the inrush water disaster and adjusting and controlling the mutual feedback of the underground engineering as claimed in claim 1, wherein the scheme for avoiding and controlling the inrush water disaster comprises:
reducing the pressure of underground water by dewatering and pressure relief; the stability of the outburst-prevention rock mass is improved through grouting reinforcement; the engineering disturbance is reduced and the distribution characteristics of a stress field and a seepage field are changed through the optimization of the construction scheme.
10. A prediction and mutual feedback regulation and control system for water inrush disasters of underground projects is characterized by comprising the following components:
the prediction module is used for predicting the risk of the sudden water inrush disaster according to the geological conditions of the underground engineering;
the evaluation module is used for carrying out mechanical evaluation on the inrush water disaster based on the rock mass fracture criterion;
the prediction module is used for dynamically predicting the water inrush disaster by establishing a safety coefficient contour map of the outburst-prevention rock mass;
and the regulation and control module is used for providing a scheme for avoiding and regulating the sudden water disaster according to key factors and control parameters in the sudden water disaster change process so as to realize disaster regulation and control.
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