CN107798184A - A kind of determination method of the critical big inbreak span in goaf - Google Patents
A kind of determination method of the critical big inbreak span in goaf Download PDFInfo
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- CN107798184A CN107798184A CN201710978992.9A CN201710978992A CN107798184A CN 107798184 A CN107798184 A CN 107798184A CN 201710978992 A CN201710978992 A CN 201710978992A CN 107798184 A CN107798184 A CN 107798184A
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- goaf
- inbreak
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a kind of determination method of the critical big inbreak span in goaf, determines the critical big inbreak span in goaf as the following formula：The present invention weakens thickness degree and gob floor buried depth to determine the critical big inbreak span in goaf according to earth's surface；According to critical big inbreak span control underground back production scope, to control the inbreak process in goaf, or reach the time of critical big inbreak span according to Goaf Area, predict that big inbreak and surface subsidence are cheated the time to be formed, prevent and treat the harmful of mined out area safety economy.The present invention is applied to tilt Slowly inclined large and thick ore body underground Mining by caving method mine or the mine of such ore body open stope afterwards filling; the former is applied to erecting dense individual props hazard prediction and preventing and treating; the latter is applied to protect earth's surface not to be destroyed, and can obtain safe, economic and efficient prevention effect.
Description
Technical field
The present invention relates to metalliferous deposit underground mining technical field, specifically a kind of critical big inbreak span in goaf is really
Determine method.
Background technology
Blast impact, gushing water and earth's surface caused by the big inbreak in goaf the disaster such as subside into current production mine most terrible disaster
One of evil, until in recent years, this disaster still frequently occurs, and is although people know increasing with mined-out area span after all
Big height increase, but cannot know when that big inbreak occurs, i.e., big inbreak time of origin not can determine that some mines count in advance
The year even surface subsidence of more than ten years prevention in advance, result is not collapse for several years, and personnel enter the plantation as usual of Jing Xie areas, and the plantation several years does not have
Problem, once earth's surface is emitted suddenly, it is easy to cause disaster.It is also equally several years that working face in the pit, which reserves the protection of ore granular media,
Do not work, worker just inclines to believe in " experience " controlled oneself, and protection bed course is no longer conscientiously reserved, as a result by high-volume inbreak
Or even the blast impact of big inbreak.It should say, the decline in alertness of people is the main reason for causing this kind of disaster frequently to occur.Du
The generation of exhausted such disaster, best bet is to determine out the time that big inbreak occurs, implements prophylactico-therapeutic measures accordingly, so easy
Ensure prophylactico-therapeutic measures in place, realize the effect effectively prevented and treated, but there has been no practicable determination side of big inbreak time at present
Method and inbreak course control method, this has just buried potential safety hazard for relevant staff.
The content of the invention
It is an object of the invention to provide a kind of determination method of the critical big inbreak span in goaf, to solve above-mentioned background
The problem of being proposed in technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of determination method of the critical big inbreak span in goaf, is comprised the following steps that：
Step 1, determine that earth's surface weakens the thickness of layer (including overlying Quaternary Period rock stratum and weathered layer) according to geologic information
hf, protolith compression strength TcWith the volume-weighted average γ of goaf top covering rockmass, on the section along vertical range direction, from upper
The gob floor buried depth H of the segment level and mined out sector width L of each segmentation is measured by segmentation downwardsi；
Step 2, the critical big inbreak span in goaf is determined as the following formula：(H is to adopt in formula
Dead zone bottom plate buried depth, m；hfDepth of stratum, m are weakened for earth's surface；TcFor protolith compression strength, t/m2；D is caving arch load level
The effective range of stress, m；General d=1.0~2.0m；γ be goaf top covering rockmass volume-weighted average, t/m3；LjFor goaf
Critical big inbreak span, m.)；
Step 3, since head adopts segmentation, the stopping area of each segmentation is drawn a circle to approve, by segmented projection a to plane,
Measure equivalent circular diameter on that plane, depth H where listing each segmentation and the corresponding goaf equivalent circular diameter L that adds up, with by
Formula in step 2 presses the L that H values calculatejContrast, as L≤LjWhen, corresponding segmentation will cause big inbreak to occur, and be big inbreak
It is segmented；
Step 4, it is segmented in big inbreak, by substoping schedule, determines that back production scope reaches critical and emitted greatly
Fall the time of span, the predicted time occurred as big inbreak.
As the further scheme of the present invention：When emitting earth's surface for predicting and forming the Collapse Pit time in earth's surface, Tc
Calculated by the mean compressive strength of the non-weathered rock formation of goaf overlying；When for protecting earth's surface not collapse, Tc is by goaf
The lower value for covering the compression strength of non-weathered rock formation calculates.
As the further scheme of the present invention：Tc is the product of compressive strength of rock and Rock-mass integrity index.
As the further scheme of the present invention：Under the conditions of uniformly the back production of mined-out area span is expanded, in mined-out area span
Before reaching critical big inbreak span, general roof rock presses fragmentary inbreak form inbreak, reach critical big inbreak span it
Afterwards, usually high-volume inbreak and impact wave is formed, now needs closure working face in advance and the port in goaf, prevent and emit
Fall blast impact.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention weakens thickness degree and goaf bottom according to earth's surface
Plate buried depth determines the critical big inbreak span in goaf；According to critical big inbreak span control underground back production scope, adopted with control
The inbreak process of dead zone, or reach according to Goaf Area the time of critical big inbreak span, predict big inbreak and surface subsidence
The time formed is cheated, prevents and treats the big inbreak harm in goaf safety economy；The present invention is applied to tilting Slowly inclined large and thick ore body
Lower Mining by caving method mine or the mine of such ore body open stope afterwards filling, the former is applied to erecting dense individual props hazard prediction with preventing
Control, the latter is applied to protect earth's surface not to be destroyed, and can obtain safe, economic and efficient prevention effect.
Brief description of the drawings
Fig. 1 is the schematic diagram of the determination method of the critical big inbreak span in goaf.
Embodiment
The technical scheme of this patent is described in more detail with reference to embodiment.
Referring to Fig. 1, a kind of determination method of the critical big inbreak span in goaf, is comprised the following steps that：Geology is pressed first
Data determines that earth's surface weakens layer (including overlying Quaternary Period rock stratum and weathered layer) thickness hf；In the section along vertical range direction
On, measure the gob floor buried depth H of segment level by segmentation from the top downi, and the mined out sector width L of each segmentationi,
In continuous extension goaf, goaf is represented using equivalent circular diameter (the maximum diameter of a circle that can be accommodated in the perspective plane of dead zone)
Effective span, time of critical big inbreak span is reached by equivalent circular diameter, predicts the time that big inbreak occurs；Similarly, control
Equivalent circular diameter processed, it is less than the time of critical big inbreak span, the big inbreak time can be put off.When earth's surface landform is uneven
When, gob floor buried depth H is measured by goaf center when reaching critical big inbreak span, it is corresponding that H is calculated as follows
Critical big inbreak span value：The L that will be calculatedjValue and mined out sector width LiValue is carried out pair
Than working as Li≧LjWhen, it is corresponding to be segmented into big inbreak and be segmented, when the segmentation goaf communicates completely with large empty area, Ji Jiangfa
Raw big inbreak activity.By substoping schedule, determine that back production scope all connects (goaf equivalence with existing goaf
Circular diameter is not less than critical big inbreak span) time, as big inbreak occur predicted time.Reach big inbreak in goaf
Before predicted time, all ports of the closely knit closure working face of underground granular media and dead zone, prevent that inbreak blast impacts；Meanwhile
Earth's surface sets alert tool line in the range of inbreak, prevents and subsides harm.
In conventional research, people have revealed that out erecting dense individual props undergo initial inbreak, continue inbreak, big inbreak with
In the lateral avalanche stage, Collapse Pit finally is formed in earth's surface, but the determination method of lasting inbreak and big inbreak span could not be provided.Hair
A person of good sense has found to continue inbreak and big inbreak is often indivisible, continue inbreak by the actual inbreak process in research mine for many years
It is the prelude for emitting earth's surface, under gravity field action, when caving arch enters, earth's surface weakens rock stratum while goaf height can be held
Receive inbreak rock mass broken bulk when, the big inbreak of sensible earth's surface just quickly occurs, thus proposes critical big inbreak span calculating formula.
According to the formation time of critical big inbreak span, determine the time that the big inbreak harm in goaf occurs, to implement prophylactico-therapeutic measures accordingly,
Safe, economic, efficient prevention effect can be obtained.The present invention is especially suitable for inclination Slowly inclined large and thick ore body, using oper cylinler
Sublevel caving method exploitation, earth's surface allow the metal mine of inbreak, for formulate safety production program and production safety management provide according to
According to according to this method control inbreak process, it can also be used to which filling administers goaf and protects earth's surface not to be damaged.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (4)
- A kind of 1. determination method of the critical big inbreak span in goaf, it is characterised in that comprise the following steps that；Step 1, determine that earth's surface weakens the thickness h of layer (including overlying Quaternary Period rock stratum and weathered layer) according to geologic informationf, it is former The compression strength T of rockcWith the volume-weighted average γ of goaf top covering rockmass；Step 2, the critical big inbreak span in goaf is determined as the following formula：(H is goaf bottom in formula Plate buried depth, m；hfDepth of stratum, m are weakened for earth's surface；TcFor protolith compression strength, t/m2；D is caving arch load level stress Effective range, m；General d=1.0~2.0m；γ be goaf top covering rockmass volume-weighted average, t/m3；LmIt is critical big for goaf Inbreak span, m.)；Step 3, since head adopts segmentation, the stopping area of each segmentation is drawn a circle to approve, by segmented projection a to plane, herein Equivalent circular diameter is measured in plane, depth H and corresponding cumulative goaf equivalent circular diameter L where listing each segmentationi, and by step Formula in rapid two presses the L that H values calculatejContrast, works as Li≧LjWhen, corresponding segmentation will cause big inbreak to occur, and be shaved one's head for big emit Estranged section；Step 4, it is segmented in big inbreak, by substoping schedule, determines that back production scope joins with existing goaf The time led to, make whole goaf reach critical big inbreak span, the predicted time occurred as big inbreak.
- 2. the determination method of the critical big inbreak span in goaf according to claim 1, it is characterised in that described this method Earth's surface is emitted for predicting and when earth's surface forms the Collapse Pit time, and Tc is strong by the Mean Crush of the non-weathered rock formation of goaf overlying Degree calculates；When for protecting earth's surface not collapse, Tc is calculated by the lower value of the compression strength of the non-weathered rock formation of goaf overlying.
- 3. the determination method of the critical big inbreak span in goaf according to claim 1 or 2, it is characterised in that the Tc For the product of compressive strength of rock and Rock-mass integrity index.
- 4. the determination method of the critical big inbreak span in goaf according to claim 1, it is characterised in that described uniform Under the conditions of the back production for expanding mined-out area span, before mined-out area span reaches critical big inbreak span, general roof rock is pressed Fragmentary inbreak form inbreak, after critical big inbreak span is reached, usually high-volume inbreak and impact wave is formed, this When need to block working face and the port in goaf in advance.
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| CN201710978992.9A CN107798184B (en) | 2017-10-19 | 2017-10-19 | Method for determining critical large caving span and time of goaf |
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| CN201710978992.9A CN107798184B (en) | 2017-10-19 | 2017-10-19 | Method for determining critical large caving span and time of goaf |
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Cited By (3)
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| CN109162712A (en) * | 2018-08-30 | 2019-01-08 | 北京矿冶科技集团有限公司 | A method of control avalanche goaf above rock differential settlement |
| CN110221357A (en) * | 2019-05-20 | 2019-09-10 | 深圳市勘察研究院有限公司 | A kind of long-span and shallowly buried limestone goaf integrated survey method |
| CN113338924A (en) * | 2021-05-11 | 2021-09-03 | 紫金矿业集团股份有限公司 | Control method for surface subsidence range by natural caving method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110221357A (en) * | 2019-05-20 | 2019-09-10 | 深圳市勘察研究院有限公司 | A kind of long-span and shallowly buried limestone goaf integrated survey method |
| CN110221357B (en) * | 2019-05-20 | 2020-10-09 | 深圳市勘察研究院有限公司 | Large-span shallow-buried limestone goaf comprehensive exploration method |
| CN113338924A (en) * | 2021-05-11 | 2021-09-03 | 紫金矿业集团股份有限公司 | Control method for surface subsidence range by natural caving method |
| CN113338924B (en) * | 2021-05-11 | 2023-02-10 | 紫金矿业集团股份有限公司 | Control method for surface subsidence range by natural caving method |
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Effective date of registration: 20210331 Address after: 110001 No.11, Lane 3, Wenhua Road, Heping District, Shenyang City, Liaoning Province Patentee after: Northeastern University Address before: No. 947, Qingshan District, Wuhan City, Hubei Province 430080 Patentee before: WUHAN University OF SCIENCE AND TECHNOLOGY |
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