Short-long wall intermittent filling non-pillar mining method and method for constructing storage space

Abstract

The present invention discloses a short-long wall intermittent filling coal-pillar-free mining method and a method for constructing a storage space, and the mining method includes the following steps: 1. Dividing the mining interval into a preparation working face and a plurality of continuous short-long wall intermittent filling coal-pillar-free mining working faces, each of the short-long wall intermittent filling coal-pillar-free mining working faces includes a long-wall mining working face and a short-wall mining working face arranged in sequence; 2. Mining the preparation working face; 3. Mining a plurality of short-long wall intermittent filling coal-pillar-free mining working faces in sequence; the method for constructing a storage space is carried out in coordination with the mining method. The present invention realizes coal-pillar-free mining, improves the recovery rate of coal mining, and can effectively reduce the influence of mining disturbance on the filling body, avoiding the occurrence of instability and damage of the filling body; the constructed storage spaces do not affect each other, and the storage safety is high, which not only utilizes the goaf area, but also eliminates the adverse effects of solid waste, waste gas, etc. on the environment.

Description

Technical Field

[0001] The invention belongs to the technical field of non-coal pillar mining and goaf area utilization, and specifically relates to a short-long wall discontinuous filling non-coal pillar mining method and a method for constructing a storage space. Background Art

[0002] In recent decades, the research on coal pillar-free mining at home and abroad has mainly focused on gob-side entry retention, gob-side entry excavation and "short filling and long mining" mining technology. However, whether it is gob-side entry retention, gob-side entry excavation or "short filling and long mining" technology, the mining face and gob area are under the "long wall beam" formed by mining, and the gob area is suspended in the air over a large area, which is in danger of collapse and collapse at any time. In addition, the connectivity of each mining area is high, which increases the difficulty of effective management of the gob area. Once a fire, gas, toxic and harmful gas outburst and other accidents occur, they are easy to spread throughout the mine, which will affect the normal production of the working face at the least, and endanger the lives of the workers at the worst. Some coal pillar-free mining methods use filling bodies to replace coal pillars. The mining order is to reserve coal pillars first and then recover the working face. After the recovery is completed, the filling body is used to replace the coal pillars. The management method of the gob area behind the working face is still the full collapse method, which is no different from the traditional mining process.

[0003] In addition, on the basis of leaving lanes along the goaf, the Chinese patent application with the publication number CN112502707A discloses a method for mining without coal pillars in the whole mine field by replacing coal pillars with paste pre-filling. Ma Liqiang et al. published a paper entitled "Technology for mining without coal pillars with pre-placed filling belts in thick coal seam lanes", both of which proposed a method of replacing coal pillars with pre-placed filling bodies, realizing coal pillar-free mining and improving the recovery rate of coal resources. However, these methods adopt the method of pre-placed filling bodies after lane formation, which greatly increases the difficulty of filling operations and later maintenance. First, after the lane is formed, the filling slurry loses the original coal wall as a retaining wall. This method requires the reconstruction of the retaining wall, which will greatly increase the filling cost and extend the construction period. In addition, the difficulty of sealing the filling slurry is increased due to the excessive length of the retaining wall. Secondly, after the lane is formed, the cross-section formed is too large. Under the influence of mining disturbance and concentrated stress, the uncured / cured filling bodies are prone to instability and damage, leaving hidden dangers for safe production.

[0004] The existing technology still lacks a method for coordinated space utilization of goaf in coal mining. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a short-long wall discontinuous filling pillar-free mining method which improves the recovery rate of coal mining, effectively reduces the impact of mining disturbance on the filling body, and avoids the instability and damage of the filling body.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a short-long wall discontinuous filling coal pillar-free mining method, the method comprising the following steps:

[0007] Step 1: Divide the mining area into a preparation working face and a plurality of continuous short-long wall discontinuous filling coal pillar-free mining working faces, each of which includes a long wall mining working face and a short wall mining working face arranged in sequence;

[0008] Step 2: Mining the prepared working surface;

[0009] Step 3: mining multiple short-long wall intermittent filling coal pillar-free mining working faces in sequence; wherein the specific process of mining each short-long wall intermittent filling coal pillar-free mining working face is as follows:

[0010] Step 301, mining the short-wall mining face in the short-long wall discontinuous filling coal pillar-free mining face by using a narrow strip filling mining method;

[0011] Step 302: adopt a comprehensive mechanized coal mining process to mine the longwall mining face in the short-longwall discontinuous filling pillarless mining face.

[0012] In the above-mentioned short-long wall discontinuous filling pillar-free mining method, the preparation working face is a driving working face, and the specific method of mining the preparation working face in step 2 is: using a driving machine or a continuous mining machine to dig a tunnel in the preparation working face.

[0013] In the above-mentioned short-long wall discontinuous filling coal pillar-free mining method, each short-wall mining working face in the short-long wall discontinuous filling coal pillar-free mining working face is a three-strip short-wall mining working face. The method of mining the short-wall mining working face in the short-long wall discontinuous filling coal pillar-free mining working face by using the narrow strip filling mining method in step 301 is:

[0014] Step A1, dividing the short-wall mining working face into two excavation working faces and a strip-type filling mining working face located between the two excavation working faces in a direction perpendicular to the main tunnel;

[0015] Step A2: Use narrow strip filling mining method to mine the strip filling mining face; the specific method is:

[0016] Step A201, dividing the strip filling mining working face into m narrow strips; wherein the value of m is a non-zero natural number;

[0017] Step A202, mining m narrow strips; wherein, the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main roadway to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips along a direction parallel to the main roadway, and leaving the gap between two adjacent short strips as a connecting roadway 3-22; then using filling materials to fill the N short strips in turn to form N short strip filling bodies; wherein, the value of N is a non-zero natural number;

[0018] Step A3: At two excavation working faces, use a roadheader or continuous mining machine to excavate a tunnel away from the main tunnel.

[0019] In the above-mentioned short-long wall discontinuous filling coal pillar-free mining method, the preparation working face is a five-strip short-wall mining working face, and each short-wall mining working face in the short-long wall discontinuous filling coal pillar-free mining working face is a five-strip short-wall mining working face. The method for mining the preparation working face in step 2 is the same as the method for mining the short-wall mining working face in the short-long wall discontinuous filling coal pillar-free mining working face using the narrow strip filling mining method in step 301, and both are:

[0020] Step B1, dividing the short-wall mining working face into three excavation working faces and two strip-type filling mining working faces spaced between the three excavation working faces in a direction perpendicular to the main tunnel;

[0021] Step B2: Use narrow strip filling mining method to mine the strip filling mining face; the specific method is:

[0022] Step B201, dividing the strip filling mining working face into m narrow strips; wherein the value of m is a non-zero natural number;

[0023] Step B202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main roadway to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips along a direction parallel to the main roadway, and leaving the gap between two adjacent short strips as a connecting roadway 3-22; then using filling materials to fill the N short strips in turn to form N short strip filling bodies; wherein the value of N is a non-zero natural number;

[0024] Step B3: At the three excavation working faces, use a roadheader or continuous mining machine to excavate a tunnel away from the main tunnel.

[0025] The present invention also discloses a method for constructing storage space by short-long wall discontinuous filling pillarless mining, in which the storage spaces do not affect each other and the storage safety is high, which not only utilizes the goaf but also can eliminate the adverse effects of solid waste and waste gas on the environment. The method is as follows: when the long wall mining face in the short-long wall discontinuous filling pillarless mining face is mined by the comprehensive mechanized coal mining process described in step 302, the top net is mechanizedly laid by hydraulic supports; and before the suspended top distance of the goaf is less than the maximum spacing width of the filling side wall, strip filling is performed in parallel to the direction of the main tunnel by filling materials to form the side walls of the storage space until the long wall mining face is mined; both ends of the side walls of the storage space are on top of the short strip filling body, the space between the two adjacent storage space side walls is the storage space, and a closed door is provided between the two adjacent storage space side walls.

[0026] The method for constructing storage space by the above-mentioned short-long wall intermittent filling non-pillar mining method, the method for determining the maximum interval width of the filling side wall is determined in the following two cases:

[0027] When the basic top is assumed to be a plate fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0028] When the basic top is assumed to be a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0029] Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer from the basic top, in m, i is a natural number from 1 to n, and n is the total number of rock layers from the basic top; h 1 is the basic top thickness, in m; μ is the basic top Poisson's ratio; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; i is the bulk density of the i-th rock layer from the basic top, in MN / m 3 ; E i is the elastic modulus of the i-th rock layer from the basic top, in MPa; E 1 is the basic top elastic modulus, in MPa.

[0030] In the above-mentioned short-long wall discontinuous filling non-pillar mining method, the preparation working face is a three-strip short wall mining working face, and the method for mining the preparation working face in step 2 is:

[0031] Step C1, dividing the short-wall mining working face into two excavation working faces and a strip-type filling mining working face located between the two excavation working faces in a direction perpendicular to the main tunnel;

[0032] Step C2: using a narrow strip filling mining method to mine the strip filling mining face; the specific method is:

[0033] Step C201, dividing the strip filling mining working face into m narrow strips; wherein the value of m is a non-zero natural number;

[0034] Step C202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main roadway to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips along a direction parallel to the main roadway, and leaving the gap between two adjacent short strips as a connecting roadway 3-22; then using filling materials to fill the N short strips in turn to form N short strip filling bodies; wherein the value of N is a non-zero natural number;

[0035] Step C3: At the two excavation working faces, a tunnel is excavated away from the main tunnel using a tunnel boring machine or a continuous mining machine.

[0036] In the above-mentioned short-long wall discontinuous filling coal pillar-free mining method, the short wall mining working face in the odd-numbered short-long wall discontinuous filling coal pillar-free mining working face is a five-line short wall mining working face, and the short wall mining working face in the even-numbered short-long wall discontinuous filling coal pillar-free mining working face is a three-line short wall mining working face;

[0037] The method of using the narrow strip filling mining method in step 301 to mine the short-wall mining working face in the odd-numbered short-long wall discontinuous filling coal pillar-free mining working face is:

[0038] Step D1, dividing the short-wall mining working face into three excavation working faces and two strip-type filling mining working faces spaced between the three excavation working faces in a direction perpendicular to the main tunnel;

[0039] Step D2: Use narrow strip filling mining method to mine the strip filling mining face; the specific method is:

[0040] Step D201, dividing the strip filling mining working face into m narrow strips; wherein the value of m is a non-zero natural number;

[0041] Step D202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main roadway to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips along a direction parallel to the main roadway, and leaving the gap between two adjacent short strips as a connecting roadway 3-22; then using filling materials to fill the N short strips in turn to form N short strip filling bodies; wherein the value of N is a non-zero natural number;

[0042] Step D3: At the three excavation working faces, a tunnel is excavated away from the main tunnel using a tunnel boring machine or a continuous mining machine;

[0043] The method of using the narrow strip filling mining method in step 301 to mine the short-wall mining working face in the even-numbered short-long wall discontinuous filling coal pillar-free mining working face is:

[0044] Step E1, dividing the short-wall mining working face into two excavation working faces and a strip-type filling mining working face located between the two excavation working faces in a direction perpendicular to the main tunnel;

[0045] Step E2: Use narrow strip filling mining method to mine the strip filling mining face; the specific method is:

[0046] Step E201, dividing the strip filling mining working face into m narrow strips; wherein the value of m is a non-zero natural number;

[0047] Step E202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main roadway to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips along a direction parallel to the main roadway, and leaving the gap between two adjacent short strips as a connecting roadway 3-22; then using filling materials to fill the N short strips in turn to form N short strip filling bodies; wherein the value of N is a non-zero natural number;

[0048] Step E3: At the two excavation working faces, use a roadheader or a continuous mining machine to excavate a tunnel away from the main tunnel.

[0049] The present invention also discloses a method for constructing storage space by short-long wall discontinuous filling pillarless mining, in which the storage spaces do not affect each other and the storage safety is high, which not only utilizes the goaf but also can eliminate the adverse effects of solid waste and waste gas on the environment. The method is as follows: when the long wall mining face in the short-long wall discontinuous filling pillarless mining face is mined by the comprehensive mechanized coal mining process described in step 302, the top net is mechanizedly laid by hydraulic supports; and before the suspended top distance of the goaf is less than the maximum spacing width of the filling side wall, strip filling is performed in parallel to the direction of the main tunnel by filling materials to form the side walls of the storage space until the long wall mining face is mined; both ends of the side walls of the storage space are on top of the short strip filling body, the space between the two adjacent storage space side walls is the storage space, and a closed door is provided between the two adjacent storage space side walls.

[0050] The method for constructing storage space by the above-mentioned short-long wall intermittent filling non-pillar mining method, the method for determining the maximum interval width of the filling side wall is determined in the following two cases:

[0051] When the basic top is assumed to be a plate fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0052] When the basic top is assumed to be a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0053] Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer from the basic top, in m, i is a natural number from 1 to n, and n is the total number of rock layers from the basic top; h 1 is the basic top thickness, in m; μ is the basic top Poisson's ratio; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; i is the bulk density of the i-th rock layer from the basic top, in MN / m 3 ; E i is the elastic modulus of the i-th rock layer from the basic top, in MPa; E 1 is the basic top elastic modulus, in MPa.

[0054] Compared with the prior art, the present invention has the following advantages:

[0055] 1. The short-long wall discontinuous filling non-coal pillar mining method innovatively proposed by the present invention completely realizes non-coal pillar mining and greatly improves the coal recovery rate.

[0056] 2. The short-long wall intermittent filling coal pillar-free mining method of the present invention uses a short wall filling mining method to leave artificial filling pillars when mining the short wall mining face. The artificial filling pillars realize the function of the traditional mining "coal pillars", and then the recovery tunnels on both sides of the short wall filling working face are excavated to serve the long wall mining working face. The problem of excessive disturbance to the recovery tunnel when the traditional mining technology excavates the tunnel first and then replaces the coal pillars solves the problem of difficult and high cost support caused by the complexity of existing coal pillar-free mining (leaving tunnels along the goaf, excavating tunnels along the goaf, etc.).

[0057] 3. The short-long wall discontinuous filling coal pillar-free mining method of the present invention uses strip filling mining to reserve artificial filling pillars when mining the short wall mining face. The coal walls on both sides can serve as filling retaining walls, reducing the amount of artificial plugging work, and can effectively prevent the filling retaining wall from being damaged and leaking, solving the problem of high coal pillar plugging costs in the existing filling and replacement stage.

[0058] 4. The method of constructing storage space by short-long wall discontinuous filling pillarless mining of the present invention, while mining coal, simultaneously constructs an underground storage space that can be used to store various industrial solid wastes, industrial waste gases, etc., providing a new direction for solid waste and waste gas treatment for enterprises around the mine, and can effectively reduce the impact of solid waste storage and waste gas emissions on the ecological environment.

[0059] 5. The method of constructing storage space by short-long wall discontinuous filling pillarless mining of the present invention not only constructs an underground storage space simultaneously during coal mining, but also avoids the collapse of overlying rock strata in the goaf by constructing the underground storage space, and can effectively maintain the stability of the goaf, avoid the hazards caused by the manifestation of mine pressure and the surface subsidence caused by the collapse of the roof, and solve the problems of unusable space and environmental damage caused by the traditional natural collapse method of managing the goaf.

[0060] 6. The method of constructing storage space by short-long wall intermittent filling without coal pillar mining of the present invention constructs underground storage space by intermittent filling while mining coal, and can also solve the problems of insufficient filling materials and high filling costs in some areas in the prior art.

[0061] 7. The method of constructing storage space by short-long wall discontinuous filling without coal pillar mining of the present invention reserves a filling lane while constructing the storage space, which can be used for later construction, maintenance management and ventilation functions, has the conditions for secondary design, and can be redeveloped according to later uses.

[0062] 8. The short-long wall intermittent filling pillar-free mining method and the method for constructing storage space of the present invention, the artificial filling columns left after the short wall mining face is mined can separate each long wall mining face into independent areas, which can effectively solve the problem of the spread of underground gas, fire, toxic and harmful gases, and avoid the impact and spread of sudden disasters underground; moreover, the storage space side walls formed by the reservoir constructed after the long wall mining face is mined can divide the goaf into multiple independent and closed storage spaces, and each storage space does not affect each other, so the storage safety is high.

[0063] 9. The short-long wall discontinuous filling pillar-free mining method and the method for constructing storage space of the present invention use filling materials from coal gangue in mines and various solid waste materials around the mining area, which centralizes the resource utilization of solid waste materials and eliminates the adverse effects of solid waste on the environment.

[0064] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a method flow chart of the short-long wall discontinuous filling pillar-free mining method in Embodiment 1, Embodiment 2 and Embodiment 4 of the present invention;

[0066] Figure 2 It is a schematic diagram of the working face division of the mining area in Example 1, Example 2 and Example 4 of the present invention;

[0067] Figure 3 This is a mining schematic diagram of preparing a working face in Example 1 of the present invention;

[0068] Figure 4A A schematic diagram of the division of the working face of the short-wall mining working face in Example 1 of the present invention;

[0069] Figure 4B It is a schematic diagram of dividing the strip-type filling mining working face into narrow strips and the narrow strips into short strips in Example 1 of the present invention;

[0070] Figure 4C It is a schematic diagram of mining a narrow strip to form a short strip filling body and mining the excavation working face in Example 1 of the present invention;

[0071] Figure 4D This is a schematic diagram of the short-wall mining face after mining is completed in Example 1 of the present invention;

[0072] Figure 5 A schematic diagram of mining for preparing a working face in Example 2 of the present invention;

[0073] Fig. 6A A schematic diagram of the division of the working face of the short-wall mining working face in Example 2 of the present invention;

[0074] Figure 6B It is a schematic diagram of dividing the strip-type filling mining working face into narrow strips and the narrow strips into short strips in Example 2 of the present invention;

[0075] Figure 6C It is a schematic diagram of mining a narrow strip to form a short strip filling body and mining the excavation working face in Example 2 of the present invention;

[0076] Fig.6D This is a schematic diagram of the short-wall mining working face after mining is completed in Example 2 of the present invention;

[0077] Figure 7 A schematic diagram of a storage space constructed by the short-long wall intermittent filling coal pillar-free mining method in Example 3 of the present invention;

[0078] Figure 8 Schematic diagram of the mining and short-long wall intermittent filling coal pillar-free mining working face layout for the preparation working face in Example 4 of the present invention

[0079] Fig. 9A It is a schematic diagram of dividing the strip-type filling mining working face into narrow strips and the narrow strips into short strips in Example 4 of the present invention;

[0080] Fig. 9B It is a schematic diagram of mining a narrow strip to form a short strip filling body and mining the excavation working face in Example 4 of the present invention;

[0081] Fig. 9C This is a schematic diagram of the short-wall mining working face after mining is completed in Example 4 of the present invention;

[0082] Fig.10 A schematic diagram of a storage space constructed by the short-long wall intermittent filling coal pillar-free mining method in Example 5 of the present invention;

[0083] Fig.11 It is a cross-sectional view after the storage space in Example 3 and Example 5 of the present invention is constructed.

[0084] Description of reference numerals:

[0085] 1—preparation working face; 2—longwall mining working face; 3—shortwall mining working face;

[0086] 3-1—excavation working face; 3-2—strip filling mining working face; 3-21—short strip;

[0087] 3-22—connecting tunnel; 4—main tunnel; 5—short strip filling body;

[0088] 6—mining tunnel; 7—storage space sidewall; 8—storage space;

[0089] 9—sealed door; 10—top plate; 11—filling tunnel. DETAILED DESCRIPTION

[0090] The following examples 1, 2 and 4 illustrate the short-long wall discontinuous filling pillar-free mining method of the present invention, and examples 3 and 5 illustrate the method of constructing storage space by the short-long wall discontinuous filling pillar-free mining method of the present invention.

[0091] Example 1

[0092] like Figure 1 As shown, the short-long wall discontinuous filling coal pillar-free mining method of this embodiment includes the steps of:

[0093] Step 1: Divide the mining area into a preparation working face 1 and a plurality of continuous short-long wall discontinuous filling coal pillar-free mining working faces, each of which includes a long wall mining working face 2 and a short wall mining working face 3 arranged in sequence;

[0094] During the specific implementation, the size parameters of the working face 1, the longwall mining working face 2 and the shortwall mining working face 3 are prepared according to the mine geological conditions and the working face design;

[0095] Step 2: mining the prepared working face 1;

[0096] Step 3: mining multiple short-long wall intermittent filling coal pillar-free mining working faces in sequence; wherein the specific process of mining each short-long wall intermittent filling coal pillar-free mining working face is as follows:

[0097] Step 301, mining the short-wall mining face 3 in the short-long wall discontinuous filling coal pillar-free mining face by using a narrow strip filling mining method;

[0098] Step 302: adopt a comprehensive mechanized coal mining process to mine the longwall mining face 2 in the short-longwall discontinuous filling pillar-free mining face.

[0099] In this embodiment, Figure 2 As shown, the preparation working face 1 is an excavation working face, and the specific method for mining the preparation working face 1 in step 2 is: using a multi-purpose excavator to dig out a tunnel for mining.

[0100] In this embodiment, Figure 3 As shown, each short-wall mining working face 3 in the short-long wall intermittent filling coal pillar-free mining working face is a three-strip short-wall mining working face, such as Figure 4AAs shown in FIG4D, the method of mining the short-wall mining face 3 in the short-long wall discontinuous filling coal pillar-free mining face by using the narrow strip filling mining method in step 301 is:

[0101] Step A1, dividing the short-wall mining working face 3 into two excavation working faces 3-1 and a strip-type filling mining working face 3-2 located between the two excavation working faces 3-1 in a direction perpendicular to the main tunnel 4;

[0102] Step A2: Use narrow strip filling mining method to mine the strip filling mining face 3-2; the specific method is:

[0103] Step A201, dividing the strip filling mining working face 3-2 into m narrow strips; wherein the value of m is a non-zero natural number;

[0104] Figure 4A ∽4D only shows the mining process schematic diagram when m is 1 and n is 6;

[0105] Step A202, mining m narrow strips; wherein, the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel 4 to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips 3-21 along a direction parallel to the main tunnel 4, and leaving the gap between two adjacent short strips 3-21 as a connecting tunnel 3-22; then using filling materials to fill the N short strips 3-21 in turn to form N short strip filling bodies 5; wherein the value of N is a non-zero natural number;

[0106] Step A3: At the two excavation working faces 3 - 1 , a tunnel is excavated away from the main tunnel 4 using a tunnel boring machine or a continuous mining machine. Both of the excavated tunnels are used as mining tunnels 6 .

[0107] Example 2

[0108] like Figure 5 As shown, the short-long wall discontinuous filling non-coal pillar mining method of this embodiment is different from that of embodiment 1 in that the preparation working face 1 is a five-strip short-wall mining working face, and the short-wall mining working face 3 in each of the short-long wall discontinuous filling non-coal pillar mining working faces is a five-strip short-wall mining working face, such as Fig. 6A As shown in ∽6D, the method for mining the preparation working face 1 in step 2 is the same as the method for mining the short-wall mining working face 3 in the short-long wall discontinuous filling coal pillar-free mining working face using the narrow strip filling mining method in step 301, and both are:

[0109] Step B1, dividing the short-wall mining working face 3 into three excavation working faces 3-1 and two strip-type filling mining working faces 3-2 spaced between the three excavation working faces 3-1 in a direction perpendicular to the main tunnel 4;

[0110] Step B2: Use narrow strip filling mining method to mine the strip filling mining face 3-2; the specific method is:

[0111] Step B201, dividing the strip filling mining working face 3-2 into m narrow strips; wherein the value of m is a non-zero natural number;

[0112] Step B202, mining m narrow strips; wherein, the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel 4 to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips 3-21 along a direction parallel to the main tunnel 4, and leaving the gap between two adjacent short strips 3-21 as a connecting tunnel 3-22; then using filling materials to fill the N short strips 3-21 in turn to form N short strip filling bodies 5; wherein the value of N is a non-zero natural number;

[0113] Step B3: In the three excavation working faces 3-1, a tunnel is excavated away from the main tunnel 4 using a tunnel boring machine or a continuous mining machine. The middle tunnel is used as a recovery tunnel 6 or a filling tunnel 11, and the two tunnels on both sides are used as recovery tunnels 6.

[0114] The remaining methods are the same as those in Example 1.

[0115] Example 3

[0116] This embodiment is a method for constructing storage space by using the short-long wall intermittent filling non-coal pillar mining method in Embodiment 2, specifically:

[0117] like Figure 7 and Fig.11 As shown, when the comprehensive mechanized coal mining process described in step 302 is used to mine the longwall mining face 2 in the short-longwall intermittent filling pillar-free mining face, the top mesh is mechanizedly laid using hydraulic supports; and before the suspended top distance of the goaf is less than the maximum spacing width of the filling side wall, the filling material is used to carry out strip filling parallel to the direction of the main tunnel 4 to form a storage space side wall 7 until the longwall mining face 2 is mined; both ends of the storage space side wall are on top of the short strip filling body 5, and the space between two adjacent storage space side walls 7 is the storage space 8, and a closed door 9 is provided between the two adjacent storage space side walls 7.

[0118] During specific implementation, the strength of the storage space side wall 7 must reach the strength index of the filling body designed under the geological conditions of the mine, and be able to support the top plate 10.

[0119] In this embodiment, the method for determining the maximum spacing width of the filling side wall is divided into the following two situations:

[0120] When the basic top is assumed to be a plate fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0121] When the basic top is assumed to be a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0122] Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer above the basic top, in m, i is a natural number from 1 to n, and n is the total number of rock layers above the basic top (including the basic top); h 1 is the basic top thickness, in m; μ is the basic top Poisson's ratio; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; i The unit is MN / m 3 ; E i is the elastic modulus of the ith rock layer from the basic top (including the basic top), in MPa; E 1 is the basic top elastic modulus, in MPa.

[0123] In this embodiment, filling lanes are left on both sides of each storage space constructed by short-long wall discontinuous filling pillarless mining. All storage spaces within a long wall working face are a combination. Each storage space within a combination can be managed independently, and inspection, maintenance, and operations do not interfere with each other. Work in each storage space can be carried out simultaneously or individually, with high flexibility.

[0124] Example 4

[0125] The short-long wall intermittent filling coal pillar-free mining method of this embodiment is different from that of Embodiment 1 in that:

[0126] like Figure 8 As shown, the preparation working face 1 is a three-strip short-wall mining working face, such as Figures 9A to 9C As shown, the method for mining the prepared working face 1 in step 2 is:

[0127] Step C1, dividing the short-wall mining working face 3 into two excavation working faces 3-1 and a strip-type filling mining working face 3-2 located between the two excavation working faces 3-1 in a direction perpendicular to the main tunnel 4;

[0128] Step C2: Use narrow strip filling mining method to mine the strip filling mining face 3-2; the specific method is:

[0129] Step C201, dividing the strip filling mining working face 3-2 into m narrow strips; wherein the value of m is a non-zero natural number;

[0130] Step C202, mining m narrow strips; wherein, the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel 4 to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips 3-21 along a direction parallel to the main tunnel 4, and leaving the gap between two adjacent short strips 3-21 as a connecting tunnel 3-22; then using filling materials to fill the N short strips 3-21 in turn to form N short strip filling bodies 5; wherein the value of N is a non-zero natural number;

[0131] Step C3: At the two excavation working faces 3 - 1 , a tunnel is excavated away from the main tunnel 4 using a tunnel boring machine or a continuous mining machine. Both excavated tunnels are used as mining tunnels 6 .

[0132] In this embodiment, the short-wall mining working face 3 in the odd-numbered short-long wall intermittent filling coal pillar-free mining working face is a five-strip short-wall mining working face, and the short-wall mining working face 3 in the even-numbered short-long wall intermittent filling coal pillar-free mining working face is a three-strip short-wall mining working face;

[0133] The method of using narrow strip filling mining in step 301 to mine the short wall mining face 3 in the odd number of short-long wall discontinuous filling coal pillar-free mining faces is the same and is:

[0134] Step D1, dividing the short-wall mining working face 3 into three excavation working faces 3-1 and two strip-type filling mining working faces 3-2 spaced between the three excavation working faces 3-1 in a direction perpendicular to the main tunnel 4;

[0135] Step D2: Use narrow strip filling mining method to mine the strip filling mining face 3-2; the specific method is:

[0136] Step D201, dividing the strip filling mining working face 3-2 into m narrow strips; wherein the value of m is a non-zero natural number;

[0137] Step D202, mining m narrow strips; wherein, the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel 4 to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips 3-21 along a direction parallel to the main tunnel 4, and leaving the gap between two adjacent short strips 3-21 as a connecting tunnel 3-22; then using filling materials to fill the N short strips 3-21 in turn to form N short strip filling bodies 5; wherein the value of N is a non-zero natural number;

[0138] Step D3, in the three excavation working faces 3-1, a tunnel is excavated away from the main tunnel 4 using a tunnel boring machine or a continuous mining machine, the middle tunnel is used as the mining tunnel 6 or the filling tunnel 11, and the two tunnels on both sides are used as the mining tunnel 6.

[0139] The method of using narrow strip filling mining in step 301 to mine the short wall mining face 3 in the even number of the short-long wall discontinuous filling coal pillar-free mining face is the same and is:

[0140] Step E1, dividing the short-wall mining working face 3 into two excavation working faces 3-1 and a strip-type filling mining working face 3-2 located between the two excavation working faces 3-1 in a direction perpendicular to the main tunnel 4;

[0141] Step E2: Use narrow strip filling mining method to mine the strip filling mining face 3-2; the specific method is:

[0142] Step E201, dividing the strip filling mining working face 3-2 into m narrow strips; wherein the value of m is a non-zero natural number;

[0143] Step E202, mining m narrow strips; wherein, the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel 4 to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips 3-21 along a direction parallel to the main tunnel 4, and leaving the gap between two adjacent short strips 3-21 as a connecting tunnel 3-22; then using filling materials to fill the N short strips 3-21 in turn to form N short strip filling bodies 5; wherein the value of N is a non-zero natural number;

[0144] Step E3: At the two excavation working faces 3 - 1 , a tunnel is excavated away from the main tunnel 4 using a tunnel boring machine or a continuous mining machine. Both excavated tunnels are used as mining tunnels 6 .

[0145] The remaining methods are the same as those in Example 1.

[0146] Example 5

[0147] This embodiment is a method for constructing a storage space by using the short-long wall intermittent filling non-coal pillar mining method in Embodiment 4, specifically:

[0148] like Fig.10 and Fig.11 As shown, when the comprehensive mechanized coal mining process described in step 302 is used to mine the longwall mining face 2 in the short-longwall intermittent filling pillar-free mining face, the top mesh is mechanizedly laid using hydraulic supports; and before the suspended top distance of the goaf is less than the maximum spacing width of the filling side wall, the filling material is used to carry out strip filling parallel to the direction of the main tunnel 4 to form a storage space side wall 7 until the longwall mining face 2 is mined; both ends of the storage space side wall are on top of the short strip filling body 5, and the space between two adjacent storage space side walls 7 is the storage space 8, and a closed door 9 is provided between the two adjacent storage space side walls 7.

[0149] During specific implementation, the strength of the storage space side wall 7 must reach the strength index of the filling body designed under the geological conditions of the mine, and be able to support the top plate 10.

[0150] In this embodiment, the method for determining the maximum spacing width of the filling side wall is divided into the following two situations:

[0151] When the basic top is assumed to be a plate fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0152] When the basic top is assumed to be a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0153] Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer above the basic top, in m, i is a natural number from 1 to n, and n is the total number of rock layers above the basic top (including the basic top); h 1 is the basic top thickness, in m; μ is the basic top Poisson's ratio; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; i The unit is MN / m 3 ; E i is the elastic modulus of the ith rock layer from the basic top (including the basic top), in MPa; E 1 is the basic top elastic modulus, in MPa.

[0154] In this embodiment, the preparation working face is a three-strip short-wall mining working face. Compared with Example 3, the filling mining and excavation work volume is smaller and the preparation speed is faster. The short-wall mining working face in the short-long wall discontinuous filling pillar-free mining working face adopts three-strip and five-strip short-wall mining working faces arranged alternately. The recovery speed of the entire short-long wall discontinuous filling pillar-free mining working face is faster, and two storage spaces are constructed for every two long wall working faces and a filling lane is reserved. The initial equipment investment is small and the later maintenance cost is low.

[0155] In the above embodiments 1-5, when filling, the filling material with application number 202110328722.X and invention name "magnesium-coal slag based new paving and mining filling material and preparation method thereof" is used for filling. The filling materials used come from mine gangue and various solid waste materials around the mining area, which concentrates the resource utilization of solid waste materials and eliminates the adverse effects of solid waste on the environment.

[0156] In the above embodiments 1-5, the method for mining the short-wall mining face 3 in the short-long wall intermittent filling coal pillar-free mining face uses a short-wall filling mining method to leave artificial filling pillars (N short strip filling bodies 5), and uses artificial filling pillars to realize the function of the traditional mining "coal pillars", and then digs out the recovery tunnels 6 on both sides of the short-wall filling face to serve the long-wall mining face 2. Compared with the existing coal pillar-free mining method (mining methods such as leaving tunnels along the goaf and digging tunnels along the goaf), which digs tunnels first and then replaces coal pillars, it has at least the following advantages: First, First, when reserving artificial filling pillars during strip filling mining, the unmined coal walls on both sides can serve as filling retaining walls, which not only reduces the amount of artificial sealing work, but also can effectively prevent the filling retaining walls from being damaged and leaking, solving the problem of high cost of coal pillar sealing and possible leakage in the existing filling and replacement stage; second, it avoids the problem of excessive disturbance to the recovery tunnel 6 when the traditional mining technology of first digging the tunnel and then replacing the coal pillar is avoided, solving the problem of difficult and high cost support caused by the complexity of existing coal pillar-free mining (such as leaving the tunnel along the goaf and digging the tunnel along the goaf).

[0157] In the above embodiments 1-5, the artificial filling columns left after the short-wall mining face is recovered can separate each long-wall mining face into independent areas, which can effectively solve the spread of underground gas, fire, toxic and harmful gases, and avoid the impact and spread of sudden disasters underground; the present invention completely realizes coal pillar-free mining and greatly improves the coal recovery rate; the filling materials used come from mine gangue and various solid waste materials around the mining area, and the solid waste materials are concentrated for resource utilization, eliminating the adverse effects of solid waste on the environment.

[0158] In the above embodiments 3 and 5, while mining coal, an underground storage space is simultaneously constructed, which can be used to store various industrial solid wastes, industrial waste gases, etc., providing a new direction for the solid waste and waste gas treatment of enterprises around the mine, and can effectively reduce the impact of solid waste storage and waste gas emissions on the ecological environment; while mining coal, not only is an underground storage space simultaneously constructed, but also the collapse of the overlying rock strata in the goaf is avoided by constructing the underground storage space, which can effectively maintain the stability of the goaf and avoid the hazards caused by the manifestation of mine pressure and the surface subsidence caused by the collapse of the roof. , which solves the problems of unusable space and environmental damage caused by the traditional natural collapse method for managing goafs; it can also solve the problems of insufficient filling materials and high filling costs in some areas in the prior art; while constructing the storage space, a filling lane is reserved, which can be used for later construction, maintenance management, ventilation and other functions, and has the conditions for secondary design, and can be redeveloped according to later uses; after the longwall mining face is mined, the storage space side wall formed by the reservoir can be constructed, which can divide the goaf into multiple independent and closed storage spaces, and the storage spaces do not affect each other, and the storage safety is high. The above is only a preferred embodiment of the present invention, and does not impose any limitation on the present invention. Any simple modification, change and equivalent structural change made to the above embodiment according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A short-long wall intermittent filling coal pillar-free mining method, characterized in that: The method comprises the following steps: Step 1, dividing the mining area into a preparation working face (1) and a plurality of continuous short-long wall discontinuous filling coal pillar-free mining working faces, each of the short-long wall discontinuous filling coal pillar-free mining working faces includes a long wall mining working face (2) and a short wall mining working face (3) arranged in sequence; Step 2: mining the prepared working surface (1), wherein the prepared working surface (1) is a tunneling working surface. The specific method for mining the prepared working surface (1) is: using a tunneling machine or a continuous mining machine to dig a tunnel on the prepared working surface (1); Step 3: mining multiple short-long wall discontinuous filling coal pillar-free mining working faces in sequence, wherein the short wall mining working face (3) in each of the short-long wall discontinuous filling coal pillar-free mining working faces is a three-strip short wall mining working face, wherein the specific process of mining each short-long wall discontinuous filling coal pillar-free mining working face is as follows: Step 301, adopting a narrow strip filling mining method to mine the short-wall mining face (3) in the short-long wall discontinuous filling coal pillar-free mining face, the method of adopting a narrow strip filling mining method to mine the short-wall mining face (3) in the short-long wall discontinuous filling coal pillar-free mining face is: Step A1, dividing the short-wall mining working face (3) into two excavation working faces (3-1) and a strip-type filling mining working face (3-2) located between the two excavation working faces (3-1) in a direction perpendicular to the main tunnel (4); Step A2: Use narrow strip filling mining method to mine the strip filling mining face (3-2); the specific method is: Step A201, dividing the strip-type backfill mining working face (3-2) into m narrow strips; wherein the value of m is a non-zero natural number; Step A202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel (4) to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips (3-21) along a direction parallel to the main tunnel (4), leaving the gap between two adjacent short strips (3-21) as a connecting tunnel 3-22; then using filling materials to fill the N short strips (3-21) in turn to form N short strip filling bodies (5); wherein the value of N is a non-zero natural number; Step A3: At two excavation working faces (3-1), a tunnel is excavated by using a roadheader or a continuous mining machine away from the main tunnel (4); The preparation working face (1) is a five-strip short-wall mining working face, and each short-wall mining working face (3) in the short-long wall intermittent filling coal pillar-free mining working face is a five-strip short-wall mining working face. The method for mining the preparation working face (1) in step 2 is the same as the method for mining the short-wall mining working face (3) in the short-long wall intermittent filling coal pillar-free mining working face using the narrow strip filling mining method in step 301, and both are: Step B1, dividing the short-wall mining working face (3) into three excavation working faces (3-1) and two strip-type filling mining working faces (3-2) spaced between the three excavation working faces (3-1) in a direction perpendicular to the main tunnel (4); Step B2: Use narrow strip filling mining method to mine the strip filling mining face (3-2); the specific method is: Step B201, dividing the strip-type backfill mining working face (3-2) into m narrow strips; wherein the value of m is a non-zero natural number; Step B202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel (4) to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips (3-21) along a direction parallel to the main tunnel (4), leaving the gap between two adjacent short strips (3-21) as a connecting tunnel 3-22; then using filling materials to fill the N short strips (3-21) in turn to form N short strip filling bodies (5); wherein the value of N is a non-zero natural number; Step B3, at the three excavation working faces (3-1), use a roadheader or a continuous mining machine to dig out a tunnel away from the main tunnel (4); Step 302: adopt a comprehensive mechanized coal mining process to mine the longwall mining face (2) in the short-longwall discontinuous filling coal pillar-free mining face.

2. The short-long wall intermittent filling coal pillar-free mining method according to claim 1, characterized in that: The preparation working face (1) is a five-strip short-wall mining working face, and each short-wall mining working face (3) in the short-long wall intermittent filling coal pillar-free mining working face is a five-strip short-wall mining working face. The method for mining the preparation working face (1) in step 2 is the same as the method for mining the short-wall mining working face (3) in the short-long wall intermittent filling coal pillar-free mining working face using the narrow strip filling mining method in step 301, and both are: Step B1, dividing the short-wall mining working face (3) into three excavation working faces (3-1) and two strip-type filling mining working faces (3-2) spaced between the three excavation working faces (3-1) in a direction perpendicular to the main tunnel (4); Step B2: Use narrow strip filling mining method to mine the strip filling mining face (3-2); the specific method is: Step B201, dividing the strip-type backfill mining working face (3-2) into m narrow strips; wherein the value of m is a non-zero natural number; Step B202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel (4) to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips (3-21) along a direction parallel to the main tunnel (4), leaving the gap between two adjacent short strips (3-21) as a connecting tunnel 3-22; then using filling materials to fill the N short strips (3-21) in turn to form N short strip filling bodies (5); wherein the value of N is a non-zero natural number; Step B3: At the three excavation working faces (3-1), a tunnel is excavated in each of the three excavation working faces away from the main tunnel (4) using a tunnel boring machine or a continuous mining machine.

3. A method for constructing storage space using the short-long wall intermittent filling pillar-free mining method as claimed in claim 2, characterized in that: The method comprises: when the longwall mining face (2) in the short-longwall intermittent filling pillar-free mining face is mined by using a comprehensive mechanized coal mining process as described in step 302, a hydraulic support is used to mechanically lay a top net; and before the suspended top distance of the goaf is less than the maximum spacing width of the filling side wall, a filling material is used to perform strip filling in parallel to the direction of the main tunnel (4) to form a storage space side wall (7) until the longwall mining face (2) is mined; both ends of the storage space side wall (7) are supported on the short strip filling body (5), the space between two adjacent storage space side walls (7) is the storage space (8), and a closed door (9) is provided between the two adjacent storage space side walls (7).

4. A method for constructing storage space by using the short-long wall intermittent filling pillar-free mining method as claimed in claim 3, characterized in that: The method for determining the maximum spacing width of the filling side wall is determined in the following two cases: When the basic top is a plate-type fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ; When the basic top is a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ; Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer above the basic top, in m, i is a natural number from 1 to n, n is the total number of rock layers above the basic top; h1 is the thickness of the basic top, in m; μ is the Poisson's ratio of the basic top; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; i is the bulk density of the i-th rock layer from the basic top, in MN / m 3 ; E i is the elastic modulus of the i-th rock layer from the basic top, in MPa; E1 is the elastic modulus of the basic top, in MPa.

5. The short-long wall intermittent filling non-pillar mining method according to claim 1, characterized in that: The preparation working face (1) is a three-strip short-wall mining working face. The method for mining the preparation working face (1) in step 2 is: Step C1, dividing the short-wall mining working face (3) into two excavation working faces (3-1) and a strip-type filling mining working face (3-2) located between the two excavation working faces (3-1) in a direction perpendicular to the main tunnel (4); Step C2: using a narrow strip filling mining method to mine the strip filling mining face (3-2); the specific method is: Step C201, dividing the strip filling mining working face (3-2) into m narrow strips; wherein the value of m is a non-zero natural number; Step C202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel (4) to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips (3-21) along a direction parallel to the main tunnel (4), leaving the gap between two adjacent short strips (3-21) as a connecting tunnel 3-22; then using filling materials to fill the N short strips (3-21) in turn to form N short strip filling bodies (5); wherein the value of N is a non-zero natural number; Step C3: At the two excavation working faces (3-1), a tunnel is excavated by using a tunneling machine or a continuous mining machine away from the main tunnel (4).

6. The short-long wall intermittent filling non-pillar mining method according to claim 5, characterized in that: The short-wall mining working faces (3) in the odd-numbered short-long wall intermittent filling coal pillar-free mining working faces are five-line short-wall mining working faces, and the short-wall mining working faces (3) in the even-numbered short-long wall intermittent filling coal pillar-free mining working faces are three-line short-wall mining working faces; The method of using the narrow strip filling mining method in step 301 to mine the short wall mining face (3) in the odd number of the short-long wall discontinuous filling coal pillar-free mining face is: Step D1, dividing the short-wall mining working face (3) into three excavation working faces (3-1) and two strip-type filling mining working faces (3-2) spaced between the three excavation working faces (3-1) in a direction perpendicular to the main tunnel (4); Step D2: Use narrow strip filling mining method to mine the strip filling mining face (3-2); the specific method is: Step D201, dividing the strip filling mining working face (3-2) into m narrow strips; wherein the value of m is a non-zero natural number; Step D202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel (4) to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips (3-21) along a direction parallel to the main tunnel (4), leaving the gap between two adjacent short strips (3-21) as a connecting tunnel 3-22; then using filling materials to fill the N short strips (3-21) in turn to form N short strip filling bodies (5); wherein the value of N is a non-zero natural number; Step D3, at the three excavation working faces (3-1), use a roadheader or a continuous mining machine to dig out a tunnel away from the main tunnel (4); The method of using the narrow strip filling mining method in step 301 to mine the short wall mining face (3) in the even number of the short-long wall discontinuous filling coal pillar-free mining face is: Step E1, dividing the short-wall mining working face (3) into two excavation working faces (3-1) and a strip-type filling mining working face (3-2) located between the two excavation working faces (3-1) in a direction perpendicular to the main tunnel (4); Step E2: Use narrow strip filling mining method to mine the strip filling mining face (3-2); the specific method is: Step E201, dividing the strip filling mining working face (3-2) into m narrow strips; wherein the value of m is a non-zero natural number; Step E202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel (4) to form a narrow strip goaf area, dividing the narrow strip goaf area into N short strips (3-21) along a direction parallel to the main tunnel (4), leaving the gap between two adjacent short strips (3-21) as a connecting tunnel 3-22; then using filling materials to fill the N short strips (3-21) in turn to form N short strip filling bodies (5); wherein the value of N is a non-zero natural number; Step E3: At the two excavation working faces (3-1), a tunnel is excavated by using a tunnel boring machine or a continuous mining machine away from the main tunnel (4).

7. A method for constructing storage space using the short-long wall intermittent filling pillar-free mining method as claimed in claim 6, characterized in that: The method comprises: when the longwall mining face (2) in the short-longwall intermittent filling pillar-free mining face is mined by using a comprehensive mechanized coal mining process as described in step 302, a hydraulic support is used to mechanically lay a top net; and before the suspended top distance of the goaf is less than the maximum spacing width of the filling side wall, a filling material is used to perform strip filling in parallel to the direction of the main tunnel (4) to form a storage space side wall (7) until the longwall mining face (2) is mined; both ends of the storage space side wall (7) are supported on the short strip filling body (5), the space between two adjacent storage space side walls (7) is the storage space (8), and a closed door (9) is provided between the two adjacent storage space side walls (7).

8. A method for constructing storage space by using the short-long wall intermittent filling pillar-free mining method as claimed in claim 7, characterized in that: The method for determining the maximum spacing width of the filling side wall is determined in the following two cases: When the basic top is a plate-type fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ; When the basic top is a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ; Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer above the basic top, in m, i is a natural number from 1 to n, n is the total number of rock layers above the basic top; h1 is the thickness of the basic top, in m; μ is the Poisson's ratio of the basic top; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; i is the bulk density of the i-th rock layer from the basic top, in MN / m 3 ; E i is the elastic modulus of the i-th rock layer from the basic top, in MPa; E1 is the elastic modulus of the basic top, in MPa.

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