CN105467429A - Hard rock mine ground pressure coupling prediction method - Google Patents
Hard rock mine ground pressure coupling prediction method Download PDFInfo
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- CN105467429A CN105467429A CN201510824708.3A CN201510824708A CN105467429A CN 105467429 A CN105467429 A CN 105467429A CN 201510824708 A CN201510824708 A CN 201510824708A CN 105467429 A CN105467429 A CN 105467429A
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Abstract
The invention discloses a hard rock mine ground pressure coupling prediction method. The invention mainly relates to the coupling prediction method aiming at a stress shown by hard rock mine ground pressure and sound emission. Compared to the prior art, by using the method in the invention, aiming at rock stability prediction information and method defects of a plurality of monitoring methods, a hard rock mine stress-sound emission combination monitoring method with a high technology application and high accuracy is provided. Coupling analysis of information collected by the plurality of monitoring method is realized. From a technology principle, a defect reflected by single monitoring technology is gotten rid of so that a set of complete and effective ground pressure monitoring prediction method is acquired. A ground pressure condition of a stoping process of residual and difficult-mining ore bodies is accurately predicted. Safety of work personnel and equipment is guaranteed. Accurate prediction of the hard rock mine ground pressure is realized and a popularization usage value is possessed.
Description
Technical field
The present invention relates to a kind of mineral prospecting technique, particularly relate to the method for a kind of hard-rock mine mountain region pressure coupling prediction.
Background technology
At present, it is limited that the exploitation of China part old mine is faced with deep resource reserves, and the phenomenon of a large amount of ore pillars or uneasily mining orebody not yet back production has been left in exploitation early stage, and this part Ore Body amount is large, of high grade, has back production and is worth.But residual or uneasily mining orebody mostly concentrates on ground nip, these regions experienced by repeatedly disturbance repeatedly in early stage in exploitation process, cause back production regional stress larger, rock mass strength weakens serious, make back production face larger security risk, for the high winning technology ground nip that ensures safety is residual and uneasily mining orebody, the method for applicable ground pressure prediction must be aided with in exploitation process, reasonable judgement ore body stability, instructs safety in production.At present, mine mainly presses monitoring and predicting method to comprise following several respects.
One, displacement monitoring
Displacement monitoring method measures the inner external displacement caused due to effect of stress of ore deposit rock, in the tunnel that the method is more applied to Long-Time Service or ground pressure manifest the displacement monitoring of exposure place in earlier stage.The method is efficient and convenient, cost is low, but does not press the regions such as the stope after manifesting serious and filling with being suitable for, and the method is more analyzes distortion Changing Pattern by rule of thumb, and the judge of nip rock stability exists hysteresis quality and uncertainty over the ground.
Its two, stress monitoring
Stress monitoring method is that monitoring element is seated to ore pillar inside, fully measures internal stress change, instructs follow-up mining work, have very strong antijamming capability.Single stress monitoring instrument can judge ore pillar STRESS VARIATION situation according to monitoring result, and then reflection regional area stress is concentrated and the rule discharged.But stress monitoring is only limitted to the size variation situation judging rock mass support zone stress, whether rock mass to be broken and the load-bearing capacity even unstability that declines that causes by breaking cannot differentiate.Therefore, single stress monitoring method unpredictable back production location rock stability situation is relied on.
Its three, acoustic emission monitor(ing)
Acoustic emission monitor(ing) is the technology utilizing acoustic emission signal to infer acoustic emission mechanism and propagation medium feature.During rock stress deformation, rock crackle ambient stress is concentrated, and strain energy is higher, increases, Crack Extension with external force, thus a part of energy of storage discharges with sound wave form.Accepted by acoustic emission automonitor, judge the destruction situation of rock mass whereby, be widely used in rock body quality of mine stability prediction at present.But laboratory repetition test is verified, rock all can produce acoustic emission phenomenon in pressurized overall process, namely the micro-crack of pressure-bearing process closes and again opens until large area crackle is through all along with the generation of acoustic emission phenomenon, the signal that acoustic emission monitor(ing) receives may be each process of bearing pressure, and the actual omen only having the Crack Extension through stage to be only Instability of Rock Body.Therefore, on-the-spot single acoustic emission monitor(ing) can not Accurate Prediction Instability of Rock Body.
All to embody means single for various ground pressure monitoring Forecasting Methodology above, the shortcoming of accurate forecast information cannot be obtained, in Hard rock mine uneasily mining orebody and residual exploitation process, because rock is hard, bear secondary concentrated stress comparatively strong, store strain energy comparatively large, once there is Instability of Rock Body, very easily bring out rock burst, great threat is formed to safety coal extraction.Main method at present for the prediction of Hard rock mine Monitoring of rock mass stability has the technical way such as stress monitoring and acoustic emission monitor(ing).But mainly there is following defect in two kinds of technological means in monitoring and prediction method.
(1) monitoring method is single
Many employing stress monitorings or acoustic emission monitor(ing) in Hard rock mine ground pressure monitoring at present, adopt single monitoring method only can destroy situation to the rock mass stress situation of change in exploitation process and inner structure and carry out analytic explanation, but two kinds of methods all independently can not illustrate whether rock mass is in collapse state, for difficulty adopt with remnant ore back production for, adopt which kind of monitoring method all can not press situation with accurately differentiating.
(2) predict the outcome unilateral
Mine stress monitoring result is analyzed, differentiate that the ground pressure that may occur manifests with this, predict the outcome too unilateral, mainly due to stress reflection is that rock mass is subject to back production disturbance and the situation of change of this raw stress that formed, stress rising and reduction are likely the processes of stress build up and dissipation, are also likely the stage before and after peaks violate.Therefore, judge Instability of Rock Body with the rising of stress and reduction, and then predictably pressure manifests, obviously too unilateral.In like manner, the intensive of the main monitoring index such as acoustie emission event number and energy rate occurs that the omen being considered to Instability of Rock Body is also too dogmatic.Because blowhole densification and crack initiation stage are also along with the generation of acoustic emission phenomenon, in addition, rock generation plastic yield is until also there is intensive acoustic emission phenomenon to produce before breaking, these two stage rocks still have larger load-bearing capacity, not unstability.Really there is the crackle through stage after peak value in Rock Failure, this one-phase has intensive acoustie emission event to produce equally.Therefore rely on merely acoustic emission index to judge that the stability of rock mass is difficult to obtain conclusion accurately, causing finally predicts the outcome there is deviation.
(3) predictive mode that is effectively coupled is lacked
Hard rock mine in observation process also can by both with the use of, but still coupled mode is short of for the convergence analysis of monitoring result, majority thinks that stress increases, acoustic emission index is intensive occurs being exactly the omen of unstability, this analytical approach really can not illustrate the true stability of rock, because rock bears the process of pressure with stress rising, acoustic emission occurs.Therefore, current coupling prediction method has larger limitation, really can not realize the Accurate Prediction of hard-rock mine mountain region pressure.
In sum, there is unicity, one-sidedness in current monitoring mode.Larger impact is defined on the accuracy predicted the outcome.Meanwhile, Forecasting Methodology lacks effective multi information coupled mode at present, cause the coupling of multiple monitoring method to be predicted and there is larger limitation.
Summary of the invention
Object of the present invention is just to provide a kind of hard-rock mine mountain region to press the method for coupling prediction to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes following steps:
1. monitoring sensor is arranged: sensor setting is cylindric, and specification is less than the usual bore diameter 38mm in mine, when sensor is arranged, first selects to facilitate construction part to construct two on the crag at monitoring point place
boring, be respectively stress gaging hole and acoustic emission gaging hole, require that hole depth is greater than 2m, be generally 2 ~ 2.5m, for ensureing two kinds of measuring-signal reflection same place rock mass information, two gaging hole horizontal ranges are less than 0.5m, consider convenient construction simultaneously, be generally 0.3 ~ 0.5m, then in taseometer gaging hole, borehole stressmeter is put at the bottom of hole, and by turning taseometer shell fragment by borehole stressmeter Shi Hanzhang at about 10MPa, then in another boring, calibrate AE sensor is put into, require sensor probes contact point and bed rock face, hole close contact, to ensure to accept acoustic emission in rock body signal, finally respectively by test lead and testing apparatus UNICOM, realize monitoring and recording Monitoring Data continuously,
2. test data coupling prediction: the rock mass stress monitor value that the acoustic emission data utilizing Acoustic radiating instrument to monitor to obtain and borehole stressmeter obtain, coupling analysis is carried out in the two at one time axle, respectively using drilling hole stress value harmony number of transmit events as two longitudinal axis data, time, as transverse axis data, judges the stability of ground nip rock mass by the coupled mode occurred.
Particularly, described step 2. in the coupling predictive mode of acoustic emission and stress as follows:
(1) voltage stabilizing-stable mode: under this pattern, whole observation process drilling hole stress value ensures at constant range, the acoustie emission event number that Acoustic radiating instrument monitoring obtains seldom even does not have, occur that this coupled mode shows that rock mass inside does not occur that stress is concentrated, also do not destroy, whole rock mass is in steady state (SS), does not press with not having in a short time and manifests;
(2) boosting-stable mode: under this pattern, whole observation process drilling hole stress value progressively raises, the acoustie emission event number of acoustic emission automonitor acquisition is simultaneously less, occur that this coupled mode shows that concentrating appears in monitoring position stress, and there is the trend risen gradually, the crack that rock mass inner structure was originally opened under the effect of the pressure is simultaneously closing gradually, occurs a small amount of acoustie emission event.Rock mass is in the carrying initial stage, and stability is better, and short-term is pressed and manifested with there will not be;
(3) boosting-bearing mode: under this pattern, whole observation process drilling hole stress value raises gradually, simultaneously along with monitoring time extends, the intensive appearance of acoustie emission event number, occur that this coupled mode shows that monitoring position occurs that stress is concentrated, stress in rock mass increases gradually, there is new crackle in rock mass inside simultaneously, and crackle is in continuous expansion, whole region portion rock mass enters plastic period, but related experiment shows that this stage rock mass still has great load-bearing capacity, there will not be large-scale destruction in a short time, and rock mass is still in the stable carrying phase.Press with there will not be and manifest;
(4) step-down-stable mode: under this pattern, whole observation process stress declines gradually, and acoustic emission automonitor does not catch a large amount of acoustie emission event simultaneously, and acoustie emission event number is less is even zero.Occur that this coupled mode shows that the secondary stress that this monitoring position rock mass had previously been concentrated progressively reduces, mainly may implement caused by back production or stress relief due to periphery somewhere, whole rock mass is in the secondary stress conversion stage, due to rock mass unloading, a small amount of acoustie emission event number produces, rock mass inside does not occur to break on a large scale, and rock mass is in steady state (SS), presses with there will not be in a short time and manifests;
(5) step-down-Failure Model: under this pattern, whole observation process stress progressively declines, and acoustic emission automonitor obtains a large amount of acoustie emission event simultaneously, and intensive appearance.Occur that this coupled mode shows to break in rock mass inside, and crackle progressively expand even through, the decline of stress monitoring value also shows that whole rock mass inner structure is broken and causes load-bearing capacity to decline, the tendency of this pattern whole Instability of Rock Body just, rock mass is in macroscopic failure in earlier stage, namely there will be larger ground pressure in a short time and manifests;
By the be coupled predictive mode of above five kinds of stress with acoustie emission event number, substantially rock mass load metamorphism is covered until destroy the various coupling result that may occur in observation process, the acoustic emission in rock body parameter and stress monitoring value coupling analysis on a timeline that obtain will be monitored, above-mentioned five kinds of coupling predictive modes can be contrasted according to analysis result, finally realize the precisely prediction of hard-rock mine mountain region pressure.
Beneficial effect of the present invention is:
The present invention is the method for a kind of hard-rock mine mountain region pressure coupling prediction, compared with prior art, the present invention is directed to above multiple monitoring method and predict information and the method defect of rock stability, the Hard rock mine stress that proposition technology is suitable for by force, accuracy is high-acoustic emission combined monitoring method.Realize the coupling analysis of multiple monitoring method Information Monitoring, to forgo from know-why the defect of single monitoring technology message reflection, thus obtain complete set and effective ground pressure monitoring Forecasting Methodology, Accurate Prediction remains and situation is pressed on the ground of uneasily mining orebody exploitation process, ensure the safety of operating personnel and equipment, realize hard-rock mine mountain region pressure Accurate Prediction, there is the value promoted the use of.
Accompanying drawing explanation
Fig. 1 is drilling plane arrangenent diagram of the present invention;
Fig. 2 is that borehole stressmeter of the present invention arranges sectional view;
Fig. 3 is that calibrate AE sensor of the present invention arranges sectional view;
Fig. 4 is coupling of the present invention prediction coordinate axis;
Fig. 5 is coupling predictive mode parameters figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
The present invention is mainly for Hard rock mine, because rock is harder, larger stress can be resisted, and store higher deformation energy, even if cause, rock deflection is very little also can be destroyed, the process simultaneously destroyed is with larger strain energy release, be embodied as the violent sound of rupture process, therefore, from the principle of Instability of Rock Body, hard rock carrying is to destructive process, and stress and acoustic emission are two main association information, therefore, major embodiment of the present invention is the coupling prediction method of pressing stress and the acoustic emission manifested for hard-rock mine mountain region.Comprise the following steps:
1. monitoring sensor is arranged: monitoring sensor should ensure to obtain stress and the main association information of acoustic emission two, therefore strain gauge and calibrate AE sensor is selected, simultaneously for adapting to the demand of mine working and crag installation, sensor setting is cylindric, and specification is
(being less than the usual bore diameter 38mm in mine).When two kinds of sensors are arranged, first select to facilitate construction part to construct two on the crag at monitoring point place
boring, be respectively stress gaging hole and acoustic emission gaging hole, require that hole depth is greater than 2m (avoiding the surface near facing the initiation of sky position distortions to get loose), be generally 2 ~ 2.5m, for ensureing two kinds of measuring-signal reflection same place rock mass information, two gaging hole horizontal ranges are less than 0.5m, consider convenient construction simultaneously, are generally 0.3 ~ 0.5m.See Fig. 1.Then in taseometer gaging hole, borehole stressmeter is put at the bottom of hole, and by turning taseometer shell fragment by borehole stressmeter Shi Hanzhang at about 10MPa, to ensure that borehole stressmeter can reflect that stress raises, stress can be embodied again and reduce.See Fig. 2.Then in another boring, calibrate AE sensor is put into, require sensor probes contact point and bed rock face, hole close contact, to ensure to accept acoustic emission in rock body signal.See Fig. 3.Finally respectively by test lead and testing apparatus UNICOM, realize monitoring and recording Monitoring Data continuously.
2. test data coupling prediction: the acoustic emission data (mainly comprising acoustie emission event number) that the method mainly utilizes Acoustic radiating instrument to monitor to obtain and the rock mass stress monitor value that borehole stressmeter obtains, coupling analysis is carried out in the two at one time axle, respectively using drilling hole stress value harmony number of transmit events as two longitudinal axis data, time, as transverse axis data, judges the stability of ground nip rock mass by the coupled mode occurred.See Fig. 4.
The coupling predictive mode of stress harmony number of transmit events is as follows:
(1) voltage stabilizing-stable mode: under this pattern, whole observation process drilling hole stress value ensures that change in time, also just fluctuate up and down in local constant range (setting prestress during because installing, so there is pressure initial value).The acoustie emission event number that Acoustic radiating instrument monitoring simultaneously obtains seldom even does not have.Occur that this coupled mode shows that rock mass inside does not occur that stress is concentrated, also do not destroy, whole rock mass is in steady state (SS), does not press with not having in a short time and manifests.See (1) in Fig. 5.
(2) boosting-stable mode: under this pattern, whole observation process drilling hole stress value progressively raises, the acoustie emission event number of acoustic emission automonitor acquisition is simultaneously less, occur that this coupled mode shows that concentrating appears in monitoring position stress, and there is the trend risen gradually, the crack that rock mass inner structure was originally opened under the effect of the pressure is simultaneously closing gradually, occurs a small amount of acoustie emission event.Rock mass is in the carrying initial stage, and stability is better, and short-term is pressed and manifested with there will not be.See (2) in Fig. 5.
(3) boosting-bearing mode: under this pattern, whole observation process drilling hole stress value raises gradually, simultaneously along with monitoring time extends, the intensive appearance of acoustie emission event number, occur that this coupled mode shows that monitoring position occurs that stress is concentrated, stress in rock mass increases gradually, there is new crackle in rock mass inside simultaneously, and crackle is in continuous expansion, whole region portion rock mass enters plastic period, but related experiment shows that this stage rock mass still has great load-bearing capacity, there will not be large-scale destruction in a short time, and rock mass is still in the stable carrying phase.Press with there will not be and manifest.See (3) in Fig. 5.
(4) step-down-stable mode: under this pattern, whole observation process stress declines gradually, and acoustic emission automonitor does not catch a large amount of acoustie emission event simultaneously, and acoustie emission event number is less is even zero.Occur that this coupled mode shows that the secondary stress that this monitoring position rock mass had previously been concentrated progressively reduces, mainly may implement caused by back production or stress relief due to periphery somewhere, whole rock mass is in the secondary stress conversion stage, due to rock mass unloading, a small amount of acoustie emission event number produces, rock mass inside does not occur to break on a large scale, and rock mass is in steady state (SS), presses with there will not be in a short time and manifests.See (4) in Fig. 5.
(5) step-down-Failure Model: under this pattern, whole observation process stress progressively declines, and acoustic emission automonitor obtains a large amount of acoustie emission event simultaneously, and intensive appearance.Occur that this coupled mode shows to break in rock mass inside, and crackle progressively expand even through, the decline of stress monitoring value also shows that whole rock mass inner structure is broken and causes load-bearing capacity to decline, the tendency of this pattern whole Instability of Rock Body just, rock mass is in macroscopic failure in earlier stage, namely there will be larger ground pressure in a short time and manifests.See (5) in Fig. 5.
By the be coupled predictive mode of above five kinds of stress with acoustie emission event number, substantially cover rock mass load metamorphism until destroy the various coupling result that may occur in observation process, see Fig. 5.To the acoustic emission in rock body parameter and stress monitoring value coupling analysis on a timeline that obtain be monitored, and above-mentioned five kinds of coupling predictive modes can be contrasted according to analysis result, finally realize the precisely prediction of hard-rock mine mountain region pressure.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (2)
1. a method for hard-rock mine mountain region pressure coupling prediction, is characterized in that, comprise the following steps:
1. monitoring sensor is arranged: sensor setting is cylindric, specification is less than the usual bore diameter 38mm in mine, when sensor is arranged, first on the crag at monitoring point place, select to facilitate construction part to construct the boring of two φ 38mm, be respectively stress gaging hole and acoustic emission gaging hole, require that hole depth is greater than 2m, be generally 2 ~ 2.5m, for ensureing two kinds of measuring-signal reflection same place rock mass information, two gaging hole horizontal ranges are less than 0.5m, consider convenient construction simultaneously, be generally 0.3 ~ 0.5m, then in taseometer gaging hole, borehole stressmeter is put at the bottom of hole, and by turning taseometer shell fragment by borehole stressmeter Shi Hanzhang at about 10MPa, then in another boring, calibrate AE sensor is put into, require sensor probes contact point and bed rock face, hole close contact, to ensure to accept acoustic emission in rock body signal, finally respectively by test lead and testing apparatus UNICOM, realize monitoring and recording Monitoring Data continuously,
2. test data coupling prediction: the rock mass stress monitor value that the acoustic emission data utilizing Acoustic radiating instrument to monitor to obtain and borehole stressmeter obtain, coupling analysis is carried out in the two at one time axle, respectively using drilling hole stress value harmony number of transmit events as two longitudinal axis data, time, as transverse axis data, judges the stability of ground nip rock mass by the coupled mode occurred.
2. the method for hard-rock mine mountain region according to claim 1 pressure coupling prediction, is characterized in that: described step 2. in the coupling predictive mode of acoustic emission and stress as follows:
(1) voltage stabilizing-stable mode: under this pattern, whole observation process drilling hole stress value ensures at constant range, the acoustie emission event number that Acoustic radiating instrument monitoring obtains seldom even does not have, occur that this coupled mode shows that rock mass inside does not occur that stress is concentrated, also do not destroy, whole rock mass is in steady state (SS), does not press with not having in a short time and manifests;
(2) boosting-stable mode: under this pattern, whole observation process drilling hole stress value progressively raises, the acoustie emission event number of acoustic emission automonitor acquisition is simultaneously less, occur that this coupled mode shows that concentrating appears in monitoring position stress, and there is the trend risen gradually, the crack that rock mass inner structure was originally opened under the effect of the pressure is simultaneously closing gradually, occurs a small amount of acoustie emission event.Rock mass is in the carrying initial stage, and stability is better, and short-term is pressed and manifested with there will not be;
(3) boosting-bearing mode: under this pattern, whole observation process drilling hole stress value raises gradually, simultaneously along with monitoring time extends, the intensive appearance of acoustie emission event number, occur that this coupled mode shows that monitoring position occurs that stress is concentrated, stress in rock mass increases gradually, there is new crackle in rock mass inside simultaneously, and crackle is in continuous expansion, whole region portion rock mass enters plastic period, but related experiment shows that this stage rock mass still has great load-bearing capacity, there will not be large-scale destruction in a short time, and rock mass is still in the stable carrying phase.Press with there will not be and manifest;
(4) step-down-stable mode: under this pattern, whole observation process stress declines gradually, and acoustic emission automonitor does not catch a large amount of acoustie emission event simultaneously, and acoustie emission event number is less is even zero.Occur that this coupled mode shows that the secondary stress that this monitoring position rock mass had previously been concentrated progressively reduces, mainly may implement caused by back production or stress relief due to periphery somewhere, whole rock mass is in the secondary stress conversion stage, due to rock mass unloading, a small amount of acoustie emission event number produces, rock mass inside does not occur to break on a large scale, and rock mass is in steady state (SS), presses with there will not be in a short time and manifests;
(5) step-down-Failure Model: under this pattern, whole observation process stress progressively declines, and acoustic emission automonitor obtains a large amount of acoustie emission event simultaneously, and intensive appearance.Occur that this coupled mode shows to break in rock mass inside, and crackle progressively expand even through, the decline of stress monitoring value also shows that whole rock mass inner structure is broken and causes load-bearing capacity to decline, the tendency of this pattern whole Instability of Rock Body just, rock mass is in macroscopic failure in earlier stage, namely there will be larger ground pressure in a short time and manifests;
By the be coupled predictive mode of above five kinds of stress with acoustie emission event number, substantially rock mass load metamorphism is covered until destroy the various coupling result that may occur in observation process, the acoustic emission in rock body parameter and stress monitoring value coupling analysis on a timeline that obtain will be monitored, above-mentioned five kinds of coupling predictive modes can be contrasted according to analysis result, finally realize the precisely prediction of hard-rock mine mountain region pressure.
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| CN108169328A (en) * | 2017-12-27 | 2018-06-15 | 山东理工大学 | A kind of ore pillar long-time stability monitor and its installation method |
| CN112881526A (en) * | 2021-01-14 | 2021-06-01 | 江西理工大学 | Homologous monitoring displacement and acoustic emission integrated sensor |
| CN112903023A (en) * | 2021-02-07 | 2021-06-04 | 江西理工大学 | Stress and sound emission integrated sensor for homologous monitoring, monitoring method and mounting method |
| CN113219000A (en) * | 2021-04-25 | 2021-08-06 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for predicting rock burst through brittle micro-failure phenomenon of rock mass |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108169328A (en) * | 2017-12-27 | 2018-06-15 | 山东理工大学 | A kind of ore pillar long-time stability monitor and its installation method |
| CN112881526A (en) * | 2021-01-14 | 2021-06-01 | 江西理工大学 | Homologous monitoring displacement and acoustic emission integrated sensor |
| CN112903023A (en) * | 2021-02-07 | 2021-06-04 | 江西理工大学 | Stress and sound emission integrated sensor for homologous monitoring, monitoring method and mounting method |
| CN113219000A (en) * | 2021-04-25 | 2021-08-06 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for predicting rock burst through brittle micro-failure phenomenon of rock mass |
| CN113219000B (en) * | 2021-04-25 | 2021-12-24 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for predicting rock burst through brittle micro-failure phenomenon of rock mass |
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