WO2019085052A1 - Procédé de remplissage de mine de charbon pour récupérer un pilier de charbon résiduel et contrôler la stabilité d'une couche clé étanche à l'eau - Google Patents

Procédé de remplissage de mine de charbon pour récupérer un pilier de charbon résiduel et contrôler la stabilité d'une couche clé étanche à l'eau Download PDF

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Publication number
WO2019085052A1
WO2019085052A1 PCT/CN2017/112100 CN2017112100W WO2019085052A1 WO 2019085052 A1 WO2019085052 A1 WO 2019085052A1 CN 2017112100 W CN2017112100 W CN 2017112100W WO 2019085052 A1 WO2019085052 A1 WO 2019085052A1
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WIPO (PCT)
Prior art keywords
coal
filling
mining
key layer
stability
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PCT/CN2017/112100
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English (en)
Chinese (zh)
Inventor
张吉雄
孙强
周楠
张强
姜淑印
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中国矿业大学
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Publication of WO2019085052A1 publication Critical patent/WO2019085052A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00—Methods or devices for placing filling-up materials in underground workings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C41/00—Methods of underground or surface mining; Layouts therefor
    • E21C41/16—Methods of underground mining; Layouts therefor
    • E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal

Definitions

  • the invention relates to the field of filling coal mining and recovering left coal pillars, and particularly relates to a method for filling coal mining and recovering residual coal pillars and controlling the stability of the water-storing key layer.
  • Filling coal mining is a green mining technology that has been developed and widely used in recent years. This technology is a green mining and mining method with high recovery rate, which can make coal mine operations better adapt to local mining conditions, especially effective. Avoid mining damage to the ecological environment.
  • This technology is a green mining and mining method with high recovery rate, which can make coal mine operations better adapt to local mining conditions, especially effective. Avoid mining damage to the ecological environment.
  • filling materials such as meteorites and fly ash in the western mining area, and the abundant conditions of aeolian sand on the surface, how to maximize the use of surface aeolian sand materials for safety and environmental protection to improve the recovery rate of coal resources for local economic and social development Significance.
  • the object of the present invention is to provide a safe, efficient, high resource recovery rate of residual coal pillar recovery, while controlling the stability of the water-critical key layer.
  • the method for filling the recovered coal pillars of the present invention and recovering the stability of the water-storing key layer comprises the following steps:
  • the cementation filling material mainly composed of aeolian sand is used for cementing filling of the goaf in the first mining face;
  • the cemented filling material in the step a is filled with a certain bearing capacity and deformation resistance, the remaining coal pillars in the mining working face are recovered; the cementing filling material reaches a certain bearing capacity and the deformation resistance capability refers to cementation filling.
  • the material plays an effective supporting role on the top plate, and the cemented filling material is not easily deformed under the action of the upper load;
  • step b transporting the raw coal recovered in step b to the ground using transportation equipment
  • the mining is stopped, and the isolation protection coal pillar is set.
  • the certain distance L refers to the initial pressure and the falling step of the basic top.
  • the side roadway formed by the coal mining room in the first mining working face is used as the material conveying lane
  • the cementing filling pumping device is arranged in the conveying lane
  • the material is cemented and filled on both sides of the conveyance lane by a cement filling pumping device.
  • the cementing filling material achieves certain bearing capacity and anti-deformation ability, which means that the cementing filling material plays an effective supporting role on the top plate, and the cementing filling material is not easily deformed under the upper load.
  • the other side roadway formed by the coal mining room in the first mining working face is used as the coal transportation lane, and the recovered raw coal is transported to the ground through the coal transportation lane.
  • the aerated sand-based cementing filling material is selected by mixing natural aeolian sand in the western region with cement, fly ash and additives.
  • the filling rate ⁇ of the aeolian sand throwing filling in the step d is determined according to the position of the water-retaining key layer and the strength stability breaking condition.
  • the method of the invention firstly fills the cemented filling material mainly composed of aeolian sand according to the geological conditions of the mine, the ratio of the cementing material and the surrounding rock control of the working face, and the residual coal pillar is subjected to a certain bearing capacity and deformation resistance capability after the filling body reaches a certain bearing capacity and deformation resistance capacity.
  • Safety recovery then, a high-speed throwing machine and a bulldozer are used to fill a single aeolian sand in the goaf, and the filling rate of the secondary aeolian sand is determined according to the position of the aquifer and the breaking stability of the strength.
  • the method of the invention is mainly directed to the two aspects of the stability of the surrounding coal pillars and the stability control of the key layer of the water-retaining coal pillars in the western mining area, and the object is strong.
  • the stability control of the remaining coal pillars and the key layer of the water separation is carried out by cement filling and aeolian sand high-speed casting combined filling method.
  • the secondary filling is aimed at long-term stability of the key layer of water separation, and is filled with a high-speed throwing machine and a bulldozer;
  • the layer position and strength stability breaking conditions determine the filling rate of the secondary aeolian sand and control the sinking deformation of the key layer of the water barrier.
  • the technical method of the invention can utilize the surface abandonment of aeolian sand material to the maximum extent, has low cost, improves the recovery rate of coal resources, and effectively controls the long-term stability of the key layer of the quaternary clay water-separating layer and maintains the ecological environment of the local surface vegetation. It provides a new technical model for the control of high-strength mining and recovery of residual coal pillars and water-removing key layers in western mining areas of China. It is a green and efficient way to acquire resources. It has great significance in science and engineering and has broad application prospects.
  • the remaining coal pillars of the first mining working face can be recovered, and the coal resource recovery rate reaches over 90%.
  • the measured results show that the cemented filling material with a uniaxial compressive strength of 2.83 MPa or more and a filling rate of 85 %
  • the above aeolian sand throwing joint filling is combined, and the development height of the water guiding fracture zone is less than 40m, which can ensure the long-term stability of the quaternary clay aquifer at 70m position on the working surface.
  • Figure 1-1 is a plan view showing the arrangement of the working surface of the present invention.
  • Figure 1-2 is a cross-sectional view taken along line A-A of Figure 1-1;
  • Figure 2-1 is a plan view showing the filling process of the goaf of the coal house of the present invention
  • Figure 2-2 is a cross-sectional view taken along line B-B of Figure 2-1;
  • Figure 3-1 is a plan view showing the process of recycling the remaining coal pillars of the working face of the present invention
  • Figure 3-2 is a cross-sectional view taken along line C-C of Figure 3-1;
  • Figure 4-1 is a plan view showing the secondary filling process of the aeolian sand of the working face of the present invention
  • Figure 4-2 is a cross-sectional view taken along line D-D of Figure 4-1;
  • Figure 5-1 is a plan view showing the recovery of a single-cycle remaining coal pillar in the working face of the present invention
  • Figure 5-2 is a cross-sectional view taken along line E-E of Figure 5-1;
  • Figure 6-1 is a plan view of the first working face of the present invention after all the remaining coal pillars are recovered and filled;
  • Figure 6-2 is a cross-sectional view taken along line F-F of Figure 6-1.
  • a method for filling coal mining to recover residual coal pillars and controlling stability of water-storing key layers comprising the following steps:
  • the cementation filling material mainly composed of aeolian sand is used for cementing filling of the goaf in the first mining face;
  • the cemented filling material in the step a is filled with a certain bearing capacity and deformation resistance, the remaining coal pillars in the mining working face are recovered; the cementing filling material reaches a certain bearing capacity and the deformation resistance capability refers to cementation filling.
  • the material plays an effective supporting role on the top plate, and the cemented filling material is not easily deformed under the action of the upper load;
  • step b transporting the raw coal recovered in step b to the ground using transportation equipment
  • the side roadway formed by the coal mining room in the first mining face is used as the material conveying lane, and the cementing filling pumping device is arranged in the conveying lane, and the cementing filling material mainly composed of aeolian sand is cemented.
  • Filling pumping device transports coal pillars along The gob area on both sides of the roadway is cemented and filled. This filling method is more efficient and simpler.
  • the mining is stopped, and the isolation protection coal pillar is set; and the other side roadway formed by the coal mining room in the first mining working face is used as the coal transportation lane.
  • the certain distance L refers to the initial pressure and the stepping distance of the basic top.
  • a high-speed power-spraying machine can be used for the throwing machine.
  • the aerated sand-based cementing filling material is selected from natural aeolian sand in western China with cement, fly ash and a small amount of additives, and has high strength and good durability.
  • the bearing capacity and deformation resistance requirement of the aeolian sand-based cementing filling material are determined according to the geological conditions of the mine, the ratio of cementing materials and the surrounding rock control of the working face.
  • the mechanical calculation method of the elastic foundation of the rock beam is used to determine the filling rate ⁇ of the aeolian sand throwing filling in the step d, which can reduce soil erosion and water inrush disaster.
  • each adjacent two columns of coal pillars shall be arranged with a working face with a working height of 4.5 m and a working face length of 800 m.
  • the inclined length is 70m, and a partition wall 2 is left between adjacent working faces, as shown in Figure 1-1 and Figure 1-2;
  • the ground natural aeolian sand is transported to the underground and transported by the belt conveyor 5 to the secondary filling work.
  • the high-speed power-spraying machine 4 throws the aeolian sand 11 into the goaf, and when the aeolian sand 11 is piled up to a certain height, the high-speed power-spraying machine 4 is rotated, and the material is thrown to the other side of the gob;
  • the bulldozer 6 is started, and the natural aeolian sand 11 after the throwing is pushed and filled to make it topped; under the cooperation of the high-speed power-spraying machine 4 and the bulldozer 6, the sand casting and the tamping are repeated.
  • the top process is shown in Figure 4-1, Figure 4-2, Figure 5-1, Figure 5-2;
  • the remaining coal pillars of the first mining face can be recovered, and the recovery rate of coal resources reaches over 90%.
  • the measured results show that the cemented filling materials with a uniaxial compressive strength of 2.83 MPa or more and the enrichment rate are 85%.
  • the above aeolian sand throwing joint filling is combined, and the development height of the water guiding fracture zone is less than 40m, which can ensure the long-term stability of the quaternary clay aquifer at 70m position on the working surface.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

L'invention concerne un procédé de remplissage de mine de charbon pour récupérer un pilier de charbon résiduel et contrôler la stabilité d'une couche clé étanche à l'eau. Un dispositif de pompage de remplissage de ciment est disposé dans un tunnel formé par une chambre de charbon minière ; des déblais sur deux côtés sont remplis d'un matériau de remplissage de ciment à base de sable éolien, et le pilier de charbon résiduel est arrêté après qu'un corps à remplir atteint une certaine capacité de support ; et après l'arrêt du pilier de charbon, le remplissage secondaire de déblais avec du sable éolien est effectué à l'aide d'une machine de lancement à grande vitesse et d'un bulldozer. Au moyen du procédé, un matériau de sable éolien naturel de surface terrestre peut être utilisé dans toute la mesure possible, une couche clé imperméable à l'eau superposée est contrôlée de manière efficace, et un nouveau procédé technique est proposé pour tempérer le pilier de charbon résiduel dans la zone de mine écologiquement faible de la Chine occidentale et protéger l'environnement écologique.
PCT/CN2017/112100 2017-11-01 2017-11-21 Procédé de remplissage de mine de charbon pour récupérer un pilier de charbon résiduel et contrôler la stabilité d'une couche clé étanche à l'eau WO2019085052A1 (fr)

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Application Number Priority Date Filing Date Title
CN201711055756.6 2017-11-01
CN201711055756.6A CN108087021A (zh) 2017-11-01 2017-11-01 一种充填采煤回收遗留煤柱并控制隔水关键层稳定的方法

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Cited By (3)

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AU2018431390B2 (en) * 2018-07-09 2021-05-06 China University Of Mining And Technology Method for recovering room-type coal pillars by cemented filling of reserved roadways
CN114370251A (zh) * 2022-01-14 2022-04-19 安徽理工大学 一种煤层群下行开采覆岩离层定向分级分区注浆方法
CN114961731A (zh) * 2022-07-28 2022-08-30 北京科技大学 一种倾斜薄矿体空场嗣后机制砂充填回收矿柱的方法

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CN109236296B (zh) * 2018-08-02 2019-09-13 缪协兴 一种安全开采保水煤柱的设计方法
CN109577982B (zh) * 2018-12-12 2020-09-04 中国矿业大学 壁式连采连充保水采煤及水资源运移监测、水害预警方法
CN110306983A (zh) * 2019-06-15 2019-10-08 龙口矿业集团有限公司 一种采区的边角煤柱工作面开采方法
CN110359910B (zh) * 2019-07-11 2020-12-04 新汶矿业集团有限责任公司 煤矿铁路下厚煤层条带综放高位充填开采方法
CN110410076B (zh) * 2019-08-16 2021-06-08 山东科技大学 一种用于老房柱采空区遗留煤柱回收的充填开采方法
CN111206956B (zh) * 2020-01-10 2021-03-02 中国矿业大学 一种房式采煤法采空区遗留煤柱充填加固方法
CN113704863B (zh) * 2021-10-28 2022-02-18 中煤科工集团西安研究院有限公司 一种房柱式采空区控制充填关键参数设计方法
CN114687794B (zh) * 2022-03-31 2023-11-17 中国矿业大学(北京) 一种煤矿充填复采方法

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Publication number Priority date Publication date Assignee Title
AU2018431390B2 (en) * 2018-07-09 2021-05-06 China University Of Mining And Technology Method for recovering room-type coal pillars by cemented filling of reserved roadways
CN114370251A (zh) * 2022-01-14 2022-04-19 安徽理工大学 一种煤层群下行开采覆岩离层定向分级分区注浆方法
CN114370251B (zh) * 2022-01-14 2023-08-18 安徽理工大学 一种煤层群下行开采覆岩离层定向分级分区注浆方法
CN114961731A (zh) * 2022-07-28 2022-08-30 北京科技大学 一种倾斜薄矿体空场嗣后机制砂充填回收矿柱的方法

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