CN111563653A - Early warning construction method for water-rich broken stratum of underground engineering - Google Patents
Early warning construction method for water-rich broken stratum of underground engineering Download PDFInfo
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Abstract
The invention provides an early warning construction method for a water-rich broken stratum in an underground engineering, which relates to the field of underground engineering and is used for forecasting unfavorable geology and estimating water quantity through comprehensive forecasting based on joint inversion; according to the comprehensive forecast detection result, the geological disaster risk is evaluated by combining the real-time feedback of construction dynamic information; the method comprises the steps of monitoring the engineering rock mass, determining the minimum safe thickness, carrying out disaster prediction and early warning, comprehensively considering risk evaluation results under the influence of multiple factors through advanced prediction, disaster risk evaluation and monitoring early warning results, effectively realizing judgment of the magnitude, time and position of the water inrush disaster, carrying out construction permission judgment and decision according to the result, avoiding risks and guaranteeing engineering safety construction.
Description
Technical Field
The disclosure relates to the field of underground engineering, in particular to an early warning construction method for a water-rich broken stratum of an underground engineering.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the continuous development of underground engineering construction, the difficulty of engineering construction in partial areas is also continuously increased, and the underground engineering construction faces severe challenges of complex geology, complex environment, frequent disasters and the like. Among them, the water-rich broken stratum of underground engineering is one of the main geological disaster sources, and a serious water-bursting and mud-bursting disaster has occurred. Therefore, when the engineering construction traverses the water-rich and broken stratum of the underground engineering, the key of the prevention and control of the water burst disaster and the safety construction of the underground engineering is to accurately judge and decide whether construction conditions exist or not, whether the disaster occurs or not and safely pass through the water-rich and broken stratum.
The inventor finds that at present, the prevention and control of geological disasters in water-rich fractured formations mainly depend on geological forecast and risk assessment; the geological forecast often adopts a detection technology, the position and scale of an adverse geological disaster source cannot be accurately detected, and particularly, the water storage capacity of a water-rich stratum is difficult to estimate. In the aspect of risk evaluation, due to the fact that detection of information before construction is not clear, enough evaluation factors cannot be obtained, and in order to consider the dynamic property of risks in the construction process, quantitative evaluation and dynamic evaluation of geological disaster risks are difficult to achieve. In addition, the prediction and prevention of the inrush water disaster are difficult to effectively realize the disaster evolution state and the undetermined judgment of the occurrence, so that the disaster early warning and prevention and control measures are difficult to aim at, and the safe construction of the water-rich broken stratum of the underground engineering is difficult to ensure.
Disclosure of Invention
The method aims to overcome the defects in the prior art, and the method effectively realizes judgment of the magnitude, time and position of the inrush water disaster by comprehensively considering the risk evaluation result under the influence of multiple factors through advanced forecasting, disaster risk evaluation and monitoring of the early warning result, and can perform construction permission judgment and decision according to the result, avoid risks and guarantee engineering safety construction.
In order to realize the purpose, the following technical scheme is adopted:
an early warning construction method for a water-rich broken stratum of an underground project comprises the following steps:
forecasting unfavorable geology and estimating water quantity through comprehensive forecasting based on joint inversion;
according to the comprehensive forecast detection result, the geological disaster risk is evaluated by combining the real-time feedback of construction dynamic information;
monitoring the engineering rock mass, determining the minimum safe thickness, and performing disaster prediction and early warning;
and performing construction judgment and decision based on comprehensive prediction, risk assessment and prediction early warning results.
Furthermore, for comprehensive forecasting, macro geological analysis and identification are firstly carried out, the source type of the unfavorable geological disaster is judged, and then progressive comprehensive forecasting based on joint inversion is carried out.
Furthermore, in the comprehensive forecasting process, comprehensive forecasting is gradually carried out in stages from far to near by virtue of large-range searching, middle-range positioning and small-range detection and different detection methods.
Further, before risk assessment, geological information is obtained through comprehensive forecasting, geological disaster risks are quantitatively assessed, and the risk level and the disaster magnitude of the address disaster are judged.
Further, after risk assessment, for a high-risk section, monitoring structure safety information of an outburst-prevention rock mass between a bad geological disaster source and a tunnel facing space, establishing a situation prediction model, dividing an evolution stage and a development state of a water outburst process, and realizing disaster early warning and stage judgment.
And further, judging the position of the outburst-prevention rock mass and the position of the water inrush channel through microseismic monitoring, and calculating the minimum safe thickness of the outburst-prevention rock mass.
And further, issuing early warning information of the sudden water disaster according to risk assessment, disaster early warning and minimum safety thickness.
Further, when construction judgment is carried out, the risk evaluation result under the influence of multiple factors is comprehensively considered, and construction permission condition judgment is carried out.
Further, if no risk exists in the construction, carrying out water-carrying operation; if the construction is determined to be risky, the construction scheme is adjusted and optimized, so that the construction process is adaptive to the underground engineering environment.
Further, after the construction is determined to be risky, risk avoidance is carried out through grouting plugging and drainage pressure relief.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) by utilizing various detection methods and a progressive joint inversion comprehensive forecasting technology from far to near, the method is not limited to detection, the accurate forecasting and water quantity estimation of unfavorable geology in the underground engineering are realized from far to near through large-range search, middle-range positioning and small-range accurate detection, the judgment of the magnitude of the inrush water disaster is realized, the precision of the forecasting of the unfavorable geology and the accuracy of the water quantity estimation are improved, and thus the source of the unfavorable geology disaster existing in the underground engineering is accurately forecasted;
(2) the geological information obtained by comprehensive forecasting is combined with real-time feedback of construction dynamic information, and comprehensive analysis of risk factors of the water inrush disaster can be performed, so that dynamic quantitative evaluation of geological disaster risks is realized;
(3) based on the multi-physical field information evolution rule of the underground engineering, a corresponding situation prediction model is established by combining situation evaluation and a multivariate information fusion analysis theory, so that the judgment of the evolution state of the water inrush disaster can be realized; the disaster position prediction is realized by matching with the micro-seismic monitoring technology, so that the magnitude, time and position of the sudden water burst disaster are judged;
(4) the construction permission condition evaluation is carried out by comprehensively utilizing advanced geological forecast, risk evaluation and monitoring early warning results and considering the risk evaluation results under the influence of multiple factors, and the risk level of disasters is reduced or avoided and the safe construction of engineering is guaranteed for parts which do not have construction conditions and are difficult to pass safely through the adjustment and optimization of a construction scheme.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic flow chart of an early warning decision method in embodiment 1 of the present disclosure;
fig. 2 is a schematic diagram of macro-geological analysis and identification of disaster source types in embodiment 1 of the present disclosure;
fig. 3 is a schematic diagram of remote search by ensemble forecasting in embodiment 1 of the present disclosure;
fig. 4 is a schematic diagram of intermediate-distance positioning of comprehensive forecasting in embodiment 1 of the present disclosure;
FIG. 5 is a schematic diagram of close-range accurate exploration through comprehensive forecasting in embodiment 1 of the present disclosure;
fig. 6 is a schematic diagram of monitoring safety information in a high-risk zone according to embodiment 1 of the present disclosure;
fig. 7 is a schematic diagram of dividing evolution stages and development states of a water inrush process in embodiment 1 of the present disclosure;
FIG. 8 is a schematic view of microseismic monitoring of rock mass fracture position in embodiment 1 of the present disclosure;
fig. 9 is a schematic diagram of a construction decision and regulation method in embodiment 1 of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure 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 example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, 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 this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in 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 present disclosure.
As introduced in the background art, in the prior art, the position and scale of a bad geological disaster source are difficult to be accurately detected, effective judgment and risk evaluation are difficult to be carried out on a water-rich stratum, and the prediction and prevention of a sudden water inrush disaster are difficult to effectively realize the disaster evolution state and the undetermined judgment, so that disaster early warning and prevention and control measures are difficult to be purposefully focused, and the safe construction of the water-rich broken stratum of the underground engineering is difficult to be ensured; in order to solve the problems, the disclosure provides an early warning construction method for a water-rich broken stratum of an underground engineering.
Example 1
In a typical embodiment of the present disclosure, as shown in fig. 1 to 9, a construction method for early warning of a water-rich fractured formation in an underground engineering is provided.
The early warning construction method for the water-rich stratum of the underground engineering comprises the steps of carrying out corresponding detection on the front of a tunnel, comprehensively considering risk evaluation results under multiple factors, effectively realizing judgment of magnitude, time and position of a water inrush disaster, carrying out construction requirement judgment and obtaining a disaster prevention decision method according to the judgment, preventing and controlling the water-rich broken stratum disaster, and ensuring safe construction of the water-rich broken stratum of the underground engineering.
(1) And the comprehensive forecasting technology of joint inversion is adopted to realize accurate forecasting and water quantity estimation of unfavorable geology.
And (4) performing macroscopic geological analysis and identification. As shown in fig. 2, according to the 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 and tectonic zones, underground water circulation mode, runoff replenishment conditions and the like, the type of the unfavorable geological disaster source is judged by combining the comprehensive detection and analysis results, and the type is a joint crack type, a fault fracture type or a karst cave cavity type.
And a three-stage progressive comprehensive forecasting technology based on joint inversion is adopted to realize accurate forecasting of unfavorable geology and water quantity estimation.
As shown in fig. 3-5, firstly, the size and position of the fault fracture zone within a long distance of 120m are detected by a seismic wave method (TSP, TRT, etc.), then the position of the water body within a middle distance of 60m and whether the water body contains water are identified by a transient electromagnetic method, and finally the position of the water body and the water volume within a range of 30m are ascertained by an induced polarization method; accurately forecasting the source of unfavorable geological disasters existing in underground engineering from far to near;
of course, it can be understood that the detection method in each stage can be reasonably selected according to actual operation, the detection method disclosed in this embodiment is not the only feasible detection method, and other detection methods can be selected during actual operation as long as the required data and results can be accurately obtained;
the method is characterized in that multiple detection methods are utilized, a combined inversion comprehensive forecasting technology is gradually carried out in stages from far to near, the method is not limited to detection, accurate forecasting and water quantity estimation of unfavorable geology in the underground engineering are realized from far to near through large-range search, middle-range positioning and small-range accurate detection, judgment of the magnitude of the sudden water inrush disaster is realized, the precision of the forecasting of the unfavorable geology and the accuracy of the water quantity estimation are improved, and therefore the source of the unfavorable geology disaster existing in the underground engineering is accurately forecasted.
(2) And performing risk assessment and avoidance on underground engineering disasters based on advanced geological forecast detection results.
Based on the comprehensive advanced geological forecast detection result, factors such as lithology, surrounding rock conditions, space position relation between a disaster source and underground engineering, water quantity, water pressure and the like are considered, and a water inrush geological disaster risk evaluation index system and classification standards thereof are constructed by combining real-time feedback of construction dynamic information, and are shown in table 1.
And establishing a corresponding risk evaluation model by adopting risk evaluation methods such as attribute intervals, fuzzy mathematics and the like, carrying out quantitative evaluation on the risk of the geological disaster, and judging the risk level and the disaster magnitude of the geological disaster.
TABLE 1 sudden water burst disaster Risk assessment index System and grading Standard
The geological information obtained by comprehensive forecasting is combined with real-time feedback of construction dynamic information, and comprehensive analysis of risk factors of the water inrush disaster can be performed, so that dynamic quantitative evaluation of geological disaster risks is realized.
(3) And carrying out multi-field information monitoring, disaster prediction and early warning and minimum safe thickness determination on the engineering rock mass.
As shown in fig. 6, for the high-risk area, the structure safety information is monitored for the outburst-prevention rock-soil body between the unfavorable geological disaster source and the empty face of the tunnel.
As shown in fig. 7, by means of situation assessment and multivariate information fusion analysis theory, based on the evolution law of information such as outburst-prevention structure stress, displacement, osmotic pressure and the like, a situation prediction model is established, the evolution stage and the development state of the water inrush process are divided, and disaster prediction and stage judgment are realized.
As shown in fig. 8, the crack position of the outburst-prevention rock mass and the water inrush channel are accurately judged by the microseismic monitoring technology, so that the positioning of the water inrush channel (disaster position prediction) is realized.
Judging whether the outburst-prevention rock mass is damaged or not according to the geometrical characteristics of rock mass cracks and stress states such as ground stress, water pressure, dynamic load and the like and based on rock mass compression-shear damage criteria, calculating and determining the minimum safe thickness of the outburst-prevention rock mass, and issuing early warning information of the outburst water disaster according to the magnitude prediction, time prediction and position prediction results of the outburst water disaster and the relation between the current rock mass thickness and the minimum safe thickness.
(4) And performing construction permission judgment and decision based on the forecasting, risk assessment and monitoring early warning results.
Based on advanced geological forecast, disaster risk assessment and monitoring and early warning results, the risk assessment results under the influence of multiple factors are comprehensively considered, construction permission conditions are judged, whether construction conditions exist or not and whether safe passing can be achieved are judged and decided, and then the risk level of disasters is reduced or avoided through construction scheme adjustment and optimization.
As shown in fig. 9, if the construction is determined to be risk-free, the scheme of 'operation with water' and the like is adopted; if the construction is determined to be risky, the construction scheme is correspondingly adjusted and optimized, and an optimal control mode decision method which is adaptive to the construction process and the state of the construction process, such as grouting plugging, drainage pressure relief and the like, is adopted, so that risks are avoided, and the safety construction of the engineering is guaranteed.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. An early warning construction method for a water-rich broken stratum in an underground engineering is characterized by comprising the following steps:
forecasting unfavorable geology and estimating water quantity through comprehensive forecasting based on joint inversion;
according to the comprehensive forecast detection result, the geological disaster risk is evaluated by combining the real-time feedback of construction dynamic information;
monitoring the engineering rock mass, determining the minimum safe thickness, and performing disaster prediction and early warning;
and performing construction judgment and decision based on comprehensive prediction, risk assessment and prediction early warning results.
2. The early warning construction method for the water-rich broken stratum of the underground engineering as claimed in claim 1, wherein for the comprehensive forecast, the macro geological analysis and judgment are firstly carried out, the type of the source of the unfavorable geological disaster is judged, and then the gradual comprehensive forecast based on the joint inversion is carried out.
3. An early warning construction method for a water-rich broken stratum of an underground engineering as claimed in claim 2, wherein in the process of comprehensive forecasting, comprehensive forecasting is gradually carried out in stages from far to near by means of large-range searching, medium-range positioning and small-range detection and different detection methods.
4. The construction method for early warning of the water-rich fractured stratum of the underground engineering as claimed in claim 1, wherein before risk assessment, geological information is obtained through comprehensive forecasting, geological disaster risks are quantitatively assessed, and the risk level and disaster level of the address disaster are determined.
5. The construction method for early warning of water-rich fractured strata of underground engineering as claimed in claim 1, wherein after risk assessment, for the high risk section, the anti-outburst rock mass between the unfavorable geological disaster source and the tunnel facing space is monitored for structural safety information, a situation prediction model is established, the evolution stage and the development state of the water outburst process are divided, and disaster early warning and stage judgment are realized.
6. The early warning construction method of the water-rich fractured stratum of the underground engineering as claimed in claim 5, wherein the minimum safe thickness of the outburst-prevention rock is calculated by judging the position of the outburst-prevention rock and the position of the water inrush channel through microseismic monitoring.
7. The early warning construction method of the water-rich fractured formation of the underground engineering according to claim 6, wherein early warning information of the inrush water disaster is issued according to risk assessment, disaster early warning and minimum safe thickness.
8. The early warning construction method of the water-rich fractured formation of the underground engineering according to claim 1, wherein during construction judgment, the risk assessment result under the influence of multiple factors is comprehensively considered, and construction permission condition judgment is performed.
9. The construction method for early warning of water-rich broken stratum in underground engineering as claimed in claim 8, wherein if no risk exists in the construction, the operation with water is carried out; if the construction is determined to be risky, the construction scheme is adjusted and optimized, so that the construction process is adaptive to the underground engineering environment.
10. The construction method for early warning of the water-rich broken stratum in the underground engineering as claimed in claim 9, wherein after the construction is determined to be risky, risk avoidance is performed by grouting plugging, drainage and pressure relief.
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Application publication date: 20200821 |