CN108756944B - The method of surface subsidence is controlled during mining - Google Patents

The method of surface subsidence is controlled during mining Download PDF

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Publication number
CN108756944B
CN108756944B CN201810529544.5A CN201810529544A CN108756944B CN 108756944 B CN108756944 B CN 108756944B CN 201810529544 A CN201810529544 A CN 201810529544A CN 108756944 B CN108756944 B CN 108756944B
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China
Prior art keywords
stratum
layer
injected
main key
injected hole
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CN108756944A (en
Inventor
朱开成
霍超
赵明
晏嘉
赵岳
潘海洋
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General Survey And Research Institute Of China Coal Geology Bureau
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General Survey And Research Institute Of China Coal Geology Bureau
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/001Improving soil or rock, e.g. by freezing; Injections

Abstract

The present invention relates to " under three " mining pressed coal fields, provide a kind of method that coal mining controls surface subsidence in the process.Method includes the following steps: opening up sampling hole in earth's surface;Each rock stratum is sampled by sampling hole, the layer position information to obtain main key stratum and each inferior key strata;According to the layer position information of main key stratum and inferior key strata, multiple injected holes for extending respectively to grouting horizon are opened up along the direction of propulsion of working face in earth's surface;Wherein, grouting horizon is the contact surface of main key stratum with soft layer below;It is filled the water by high-pressure pump into injected hole;Direction of propulsion along working face is mined, while judging whether the hydraulic pressure in each injected hole reduces, if then being injected the coal ash pulp being pre-mixed in corresponding injected hole by high-pressure pump.The present invention judges time for injecting by the variation using hydraulic pressure in the injected hole opened up in advance, avoid coal mining during main key stratum be broken, realize the earth's surface to greatest extent in the conservation meaning of space subtract it is heavy.

Description

The method of surface subsidence is controlled during mining
Technical field
The present invention relates to " under three " mining pressed coal fields, and in particular to a kind of coal mining controls the side of surface subsidence in the process Method.
Background technique
Currently, China's coal mining underbuildings mainly have Striping noise method, goaf filling method and traditional overlying strata separation layer note Starch filling method.Wherein, Striping noise method presses in liberation China " under three " and once played particularly important effect in coal, but due to its extraction Rate is low, production efficiency is low, tunnelling rate is high, has gradually tended at present superseded.It is needed using goaf filling method same in underground When arrange coal mining system and filling system, due to mining and filling interferes with each other seriously, so that efficiency of mining is a greater impact. In addition, its filling cost is higher, coal mining enterprise is difficult to bear.And traditional overlying strata separation layer grouting filling method be absciss layer formed with Afterwards, there are certain deformations for earth's surface, can not effectively control subsidence.
Summary of the invention
The object of the present invention is to provide a kind of methods that surface subsidence is controlled during coal mining, to avoid main key stratum generation Fracture guarantees to mine and stowing operation does not interfere with each other, improves production efficiency.
In order to achieve the above objectives, the present invention provides a kind of method that surface subsidence is controlled during coal mining, this method packets Include following steps:
Sampling hole is opened up in earth's surface;
Each rock stratum is sampled by the sampling hole, the layer position letter to obtain main key stratum and each inferior key strata Breath;
According to the layer position information of the main key stratum and the inferior key strata, opened up in earth's surface along the direction of propulsion of working face Multiple injected holes for extending respectively to grouting horizon;Wherein, the grouting horizon is the main key stratum and soft layer below Contact surface where layer position;
It is filled the water by high-pressure pump into each injected hole;
Direction of propulsion along the working face is mined, while judging whether the hydraulic pressure in each injected hole subtracts It is small, if then the coal ash pulp being pre-mixed is injected in the corresponding injected hole by the high-pressure pump.
Wherein, fine coal ash concentration is 70%~75% in the coal ash pulp.
Wherein, additive is added in the coal ash pulp.
Wherein, the additive includes antifreezing agent, accelerator, retarder and/or thickener.
Wherein, the high-pressure pump is variable frequency pump.
Wherein, the grouting pressure of the high-pressure pump is not less than the pressure of the grouting horizon overlying rock.
The present invention is low in cost, operation is convenient, by being sampled using sampling hole to each rock stratum, so that it may obtain main pass The layer position information of key layer and each inferior key strata;Then, according to the layer position information of main key stratum and each inferior key strata, so that it may edge Advance of the face direction opens up multiple injected holes for extending respectively to main key stratum with soft layer contact surface below;Then, lead to It crosses high-pressure pump to fill the water into each injected hole, so that it may judge what absciss layer was formed using the variation of hydraulic pressure in injected hole when mining Opportunity, that is to say, that absciss layer is gradually forming when hydraulic pressure reduces in injected hole, to will be pre-mixed by high-pressure pump After coal ash pulp injects the injected hole, so that it may will be covered under grouting horizon using the collective effect that high-pressure powdered coal mortar and stratum are self-possessed Rock stratum is densified to seat earth and forms compacting zone;At the same time, these high-pressure powdered coal mortar can also be to grouting horizon overlying rock I.e. main key stratum position applies upward holding power, limits the movement and deformation of grouting horizon overlying rock in advance, and forming one kind has " sand coated iron mold-isolated coal pillar-filling compacting zone " pillar (stupefied formula) platform structure of carrying is imitated, and then also avoids main pass Key layer is broken, and has been inherently eliminated remaining movement and deformation space, has realized space conservation, avoid surface subsidence.Separately Outside, it is not interfere with each other due to mining with stowing operation, will not influence the normal production of working face in the pit, therefore significantly improve production Efficiency;Also, in whole process only need to the slip casting between main key stratum and below soft layer, therefore flyash is greatly reduced The dosage of slurry, reduces costs, and shortens final setting time, avoids the loss of moisture and running pulp, grout leaking in coal ash pulp and emits Starch the generation of phenomenon.
Detailed description of the invention
Fig. 1 is the sectional view of the preceding bank of slip casting in the embodiment of the present invention;
Fig. 2 is the sectional view of bank after slip casting in the embodiment of the present invention.
Appended drawing reference:
1, main key stratum;2, inferior key strata;3, soft layer;4, grouting horizon;
5, goaf;6, injected hole;7, coal ash pulp;8, compacting zone.
Specific embodiment
To keep the purposes, technical schemes and advantages of invention clearer, below in conjunction with the attached drawing in invention, in invention Technical solution be explicitly described, it is clear that described embodiment is invention a part of the embodiment, rather than whole realities Apply example.It is obtained by those of ordinary skill in the art without making creative efforts based on the embodiment in invention Every other embodiment belongs to the range of invention protection.
In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.Term " on ", The orientation or positional relationship of the instructions such as "lower" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing this hair Bright and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation Construction and operation, therefore be not considered as limiting the invention.
As depicted in figs. 1 and 2, the method that surface subsidence is controlled during a kind of coal mining provided in an embodiment of the present invention, should Method the following steps are included:
Sampling hole is opened up in earth's surface;
Each rock stratum is sampled by sampling hole, the layer position letter to obtain main key stratum 1 and each inferior key strata 2 Breath;
According to the layer position information of main key stratum 1 and inferior key strata 2, multiple points are opened up along the direction of propulsion of working face in earth's surface The injected hole 6 of grouting horizon 4 is not extended to;Wherein, grouting horizon 4 for main key stratum 1 and soft layer 3 below contact surface institute In layer position;
It is filled the water by high-pressure pump into each injected hole 6;
Direction of propulsion along working face is mined, while judging whether the hydraulic pressure in each injected hole 6 reduces, if then The coal ash pulp 7 being pre-mixed is injected in corresponding injected hole 6 by high-pressure pump.Specifically, when staff is along work When the direction of propulsion in face is mined, the overlying rock of working face can gradually generate crack with the progress of coal mining, and then cause to face Water is revealed in the injected hole 6 of nearly working face, and hydraulic pressure is greatly reduced in injected hole 6, that is to say, that and absciss layer is being formed at this time, To which staff can be injected the coal ash pulp 7 being pre-mixed in the injected hole 6 by high-pressure pump.With main key stratum 1 It is that coal ash pulp 7 is increasing at grouting horizon 4 between soft layer 3 below, these coal ash pulps 7 will be to grouting layer Position overlying rock and lower rock stratum form columnar stays, that is to say, that these 7 pop-up grouting horizon overlying rocks of coal ash pulp, Rock stratum under grouting horizon is pushed, not only the crack formed in overlying rock is formed and is squeezed, is limited on grouting horizon in advance The movement and deformation of rock stratum, but also can be laminated overlying strata under grouting horizon under the collective effect of self gravity and Fluid pressure In fact to coal seam goaf 5, compacting zone 8 is formed.
As it can be seen that the present invention is by being sampled each rock stratum using sampling hole, so that it may determine main key stratum 1 and each Asia The layer position information of key stratum 2;Then, according to the layer position information of main key stratum 1 and each inferior key strata 2, so that it may be pushed away along working face Multiple injected holes 6 for extending respectively to main key stratum 1 with 3 contact surface of soft layer below are opened up into direction;Then, pass through high pressure Pump and filled the water into each injected hole 6, so that it may mine when using in injected hole 6 hydraulic pressure variation come judge absciss layer formed when Machine, that is to say, that absciss layer is being formed when hydraulic pressure reduces in injected hole 6, thus the fine coal that will be pre-mixed by high-pressure pump After mortar 7 injects the injected hole 6, so that it may using being filled in high-pressure powdered coal mortar 7 between main key stratum 1 and below soft layer 3 Rock stratum under grouting horizon is densified to seat earth with the collective effect of stratum self weight and forms compacting zone 8;At the same time, these High-pressure powdered coal mortar 7 can also apply upward holding power to grouting horizon overlying rock, that is, main key stratum 1, limit note in advance The movement and deformation of pulp layer position overlying rock forms a kind of " sand coated iron mold-isolated coal pillar-filling compacting zone " column effectively carried Formula (stupefied formula) platform structure, and then also avoid main key stratum 1 and be broken, it is empty to be inherently eliminated remaining movement and deformation Between, space conservation is realized, surface subsidence is avoided.In addition, not interfere with each other due to mining with stowing operation, significantly improve Production efficiency;Also, in whole process only need to the slip casting between main key stratum 1 and below soft layer 3, therefore be greatly decreased The dosage of coal ash pulp 7, reduces costs, shortens final setting time, avoid the loss and race of moisture in coal ash pulp 7 The generation of slurry, grout leaking and grout phenomenon.
Preferably, fine coal ash concentration is 70%~75% in coal ash pulp 7.It further, in actual use, can be according to existing The developmental state of field weather and rock crack, adds additive, such as antifreezing agent, accelerator, retarder in coal ash pulp 7 And/or thickener.
Preferably, high-pressure pump is variable frequency pump, to adjust grouting pressure at any time according to the deformation of rock stratum, wherein note Starch the pressure that pressure is not less than grouting horizon overlying rock, that is to say, that grouting pressure, which is equal or slightly larger than on grouting horizon, to be covered The pressure of rock stratum.The advantages of this arrangement are as follows prevented rapidly using higher grouting pressure and cutting adopt after each rock Layer unstability guarantees that grouting horizon overlying rock keeps stablizing.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of invention, rather than its limitations;Although ginseng Invention is described in detail according to previous embodiment, those skilled in the art should understand that: it still can be right Technical solution documented by foregoing embodiments is modified or equivalent replacement of some of the technical features;And this It modifies or replaces, the spirit and scope for each embodiment technical solution of invention that it does not separate the essence of the corresponding technical solution.

Claims (6)

1. controlling the method for surface subsidence during a kind of coal mining, which comprises the following steps:
Sampling hole is opened up in earth's surface;
Each rock stratum is sampled by the sampling hole, the layer position information to obtain main key stratum and each inferior key strata;
According to the layer position information of the main key stratum and the inferior key strata, open up in earth's surface along the direction of propulsion of working face multiple Extend respectively to the injected hole of grouting horizon;Wherein, the grouting horizon is connecing for the main key stratum and soft layer below Layer position where contacting surface;
It is filled the water by high-pressure pump into each injected hole;
Direction of propulsion along the working face is mined, while judging whether the hydraulic pressure in each injected hole reduces, if It is to be injected the coal ash pulp being pre-mixed in the corresponding injected hole by the high-pressure pump.
2. controlling the method for surface subsidence during coal mining according to claim 1, which is characterized in that the coal ash pulp Middle fine coal ash concentration is 70%~75%.
3. controlling the method for surface subsidence during coal mining according to claim 1, which is characterized in that the coal ash pulp In be added with additive.
4. controlling the method for surface subsidence during coal mining according to claim 3, which is characterized in that the additive packet Include antifreezing agent, accelerator, retarder and/or thickener.
5. controlling the method for surface subsidence during coal mining according to claim 1, which is characterized in that the high-pressure pump is Variable frequency pump.
6. controlling the method for surface subsidence during coal mining according to any one of claims 1 to 5, which is characterized in that institute The grouting pressure for stating high-pressure pump is not less than the pressure of the grouting horizon overlying rock.
CN201810529544.5A 2018-05-29 2018-05-29 The method of surface subsidence is controlled during mining Active CN108756944B (en)

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Publication number Priority date Publication date Assignee Title
CN109630113B (en) * 2018-11-22 2020-09-08 太原理工大学 Mining overburden rock hydraulic slotting and separation layer grouting combined ground surface subsidence control method

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* Cited by examiner, † Cited by third party
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CN102704933B (en) * 2012-05-25 2014-10-29 中国矿业大学 Isolated-section grouting filling coal-mining method for mining overburden rock
CN103216236B (en) * 2013-03-13 2015-05-06 中国矿业大学(北京) Method for reducing subsidence of stope overburden bed separation by grouting
CN104933266B (en) * 2015-07-09 2016-06-15 西安科技大学 A kind of defining method of overlying strata height of the water conductive fracture zone
CN105317459B (en) * 2015-11-19 2017-07-28 中国矿业大学(北京) A kind of subregion placement method for being used to control tight roof large area caving disaster
CN206174997U (en) * 2016-10-25 2017-05-17 淮北工业建筑设计院有限责任公司 It moves towards subregion and keeps apart slip casting and fill structure to adopt overlying strata
CN107165676B (en) * 2017-06-26 2019-02-22 中国矿业大学 The Trinity monitoring method of CONTROL OF STRATA MOVEMENT
CN107989613A (en) * 2017-11-14 2018-05-04 太原理工大学 A kind of overlying strata separation layer subregion isolates grouting filling working seam complete extraction method

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