CN113688462B - Design method for controlling filling key parameters of strip-type goaf - Google Patents
Design method for controlling filling key parameters of strip-type goaf Download PDFInfo
- Publication number
- CN113688462B CN113688462B CN202111245249.5A CN202111245249A CN113688462B CN 113688462 B CN113688462 B CN 113688462B CN 202111245249 A CN202111245249 A CN 202111245249A CN 113688462 B CN113688462 B CN 113688462B
- Authority
- CN
- China
- Prior art keywords
- filling
- coal pillar
- left coal
- strip
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 title claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 200
- 239000011435 rock Substances 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 238000005065 mining Methods 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- 230000007774 longterm Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Mining & Mineral Resources (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Civil Engineering (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computational Mathematics (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a design method for controlling filling key parameters of a strip type goaf, which comprises the following steps: step 1, sampling coal rock mass of a left coal pillar in a strip-type goaf, and testing to obtain physical mechanical parameters of the coal rock mass, wherein the physical parameters comprise the coefficient of crushing and expansion of coal and the angle of repose of a stacking body; step 2, determining the maximum stripping depth of the left coal pillars according to the measured physical mechanical parameters of the coal rock mass; step 3, determining the safety coefficient of the left coal pillar according to the maximum stripping depth of the left coal pillar; step 4, determining whether the goaf needs to be filled and managed according to the safety coefficient of the left coal pillar, and determining a filling and managing mode and controlling filling parameters; the method fully utilizes the bearing performance of the remaining coal pillars in the goaf, improves the filling effect of the strip goaf and reduces the filling cost of the strip goaf.
Description
Technical Field
The invention belongs to the field of coal mining subsidence prevention and control, relates to a goaf filling control parameter, and particularly relates to a design method of a strip goaf filling control key parameter.
Background
In order to effectively control the surface subsidence after coal mining, strip mining is used as one of effective means for coal pressing mining of buildings and structures, is widely applied in China, strip mining is successively carried out on more than 10 provinces and more than 100 strip working faces, and a large number of strip goafs are formed in mining for many years.
At present, a slurry full-filling grouting method which is a common method for the current goaf treatment is still adopted for the strip type goaf. The slurry full-filling grouting method has the advantages of simple and convenient construction, capability of fundamentally treating, wide application range and the like. However, the strip type goaf has large residual cavities, large total filling square amount and high goaf treatment cost, and the bearing capacity of the coal pillar is not considered in the total filling process, so that the optimization space is large. How to fully exert the bearing performance of the coal pillar, reduce the filling design amount, reduce the goaf treatment cost, harmonize the synergistic effect of the coal pillar and the filling body, and ensure the long-term stability of the coal pillar is an important problem to be solved by the strip type goaf partial filling design. The existing column filling is not applicable to the existing old goaf with partial collapse, large burial depth, poor ventilation and incapability of working underground, and the problem that the bearing capacity of the coal column and how the coal column and a filling body are cooperatively loaded need to be considered in the treatment of the old goaf.
Therefore, a design method for controlling filling of a strip-type goaf, which can solve the problems of large buried depth, poor ventilation and incapability of working underground, is needed to improve filling efficiency, reduce filling cost and meet the requirement of stability of an overlying strata.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a design method for controlling filling key parameters of a strip type goaf, so as to solve the technical problems that the bearing performance of a left coal pillar is not considered in the filling after coal mining and the filling grouting amount is overlarge in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a design method for controlling filling key parameters of a strip-type goaf comprises the following steps:
step 1, sampling coal rock mass of a left coal pillar in a strip-type goaf, and testing to obtain physical mechanical parameters of the coal rock mass, wherein the physical parameters comprise the coefficient of crushing and expansion of coal and the angle of repose of a stacking body;
step 3, determining the safety coefficient of the left coal pillar according to the maximum stripping depth of the left coal pillar;
step 4, determining whether the goaf needs to be filled and managed according to the safety coefficient of the left coal pillar, and determining a filling and managing mode and a filling and managing control parameter, wherein the filling and managing control parameter specifically comprises the following steps:
if the safety coefficient of the left coal pillar is less than 1, selecting a filling treatment mode to carry out filling treatment on the goaf; the filling treatment mode comprises non-roof-contacting filling, pier column filling and strip filling for protecting the remaining coal columns,
wherein the key filling control parameters of the non-roof-contact filling comprise filling height and uniaxial compressive strength of a non-roof-contact filling body; the key parameters of the control filling of the pier column filling comprise the elasticity modulus of the pier column filling body and the uniaxial compressive strength of the pier column filling body; the control filling parameters for protecting the left coal pillar strip filling comprise the protection of the left coal pillar strip filling width, the protection of the elastic modulus of the left coal pillar strip filling body and the protection of the uniaxial compressive strength of the left coal pillar strip filling body.
The present invention also has the following technical features,
specifically, the maximum stripping depth of the remaining coal pillar in step 2 is determined by the following formula:
wherein the content of the first and second substances,d s maximum stripping of left coal pillarDepth, in m;φ r is the angle of repose of the stack in degrees;hthe height of the left coal pillar is m;kthe coefficient of crushing and expansion of coal.
Further, the remaining coal pillar safety factor in step 3 is determined by the following formula:
wherein the content of the first and second substances,
in the formula (I), the compound is shown in the specification,Fs s the safety factor of the left coal pillar is high;σ s is the uniaxial compressive strength of coal, in Pa;λ s the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar is the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar;γis the volume weight of overlying strata in the unit of N/m3；HThe unit is m for the mining depth;φ s the internal friction angle of the left coal pillar is expressed as an angle;athe width of the left coal pillar is m;bthe unit is m, which is the distance between the left coal pillars;r s the width of a plastic zone of the left coal pillar is m;Gto make an internal friction angle with the remaining coal pillarφ s The coefficient of interest.
Further, for non-roof fill:
the filling height is determined by the following formula:
the uniaxial compressive strength of the non-roof-connected filling body is determined by the following formula:
wherein the content of the first and second substances,h c1 is the filling height, and has the unit of m;σ c1 the uniaxial compressive strength of the non-roof-contacted filling body is expressed in Pa.
Further, the modulus of elasticity of the pier packing is determined by the following formula:
the uniaxial compressive strength of the pier stud filling body is determined by the following formula:
in the formula (I), the compound is shown in the specification,E c2 the modulus of elasticity of the pier column filling body is Pa;E s the elastic modulus of the left coal pillar is Pa;c c2 the width of the pier column filling body is m;e c2 the unit is m, and the distance between pier column filling bodies is m;h c2 the filling height of the pier column is m;σ c2 the uniaxial compressive strength of the pier column filling body is Pa;χcorrecting the coefficient for the bearing capacity of the pier of the filling body;Dis the standard sample size of the filling body, and the unit is mm; n is a coefficient of analogy whenc c2 /h c2 ≥5When the temperature of the water is higher than the set temperature,n=1.4 whenc c2 /h c2 <5，n=1。
Further, for protecting the remaining pillar strip filling:
the filling width of the protective left coal pillar strip is determined by the following formula:
the modulus of elasticity of the pack for protecting the left coal pillar strips is determined by the following formula:
the uniaxial compressive strength of the filling body for protecting the left coal pillar strips is determined by the following formula:
in the formula (I), the compound is shown in the specification,c c3 the filling width of the left coal pillar strip is protected, and the unit is m;E c3 in order to protect the elastic modulus of the filling body of the left coal pillar strip, the unit is Pa;h c3 the filling height for protecting the filling of the left coal pillar strips is m;σ c3 in order to protect the uniaxial compressive strength of the left coal pillar strip filling body, the unit is Pa; n is a coefficient of analogy whenc c3 /h c3 ≥5When the temperature of the water is higher than the set temperature,n=1.4 whenc c3 /h c3 <5，n =1。
Compared with the prior art, the invention has the following technical effects:
the method of the invention fully utilizes the bearing performance of the remaining coal pillar in the strip goaf, so that the remaining coal pillar and the filling body can play a synergistic role, and the size, the elastic modulus and the filling strength of the filling body can be accurately determined before filling operation is carried out, thereby reducing the design amount of filling, ensuring the long-term stability of the remaining coal pillar, improving the filling effect of the strip goaf and reducing the filling cost of the strip goaf.
Drawings
FIG. 1 is a schematic view of a strip coal pillar stripping model;
FIG. 2 is a drawing of a strip goaf non-roof-contacting filling model, wherein (a) is a non-roof-contacting filling mechanical model, (B) is a partial simplification of a mechanical model A, and (c) is a partial simplification of a mechanical model B;
fig. 3 is a drawing of a ribbon goaf pier column filling model, wherein (a) is a schematic plan view and (b) is a mechanical model;
fig. 4 is a strip filling model diagram of a strip goaf protection remaining coal pillar, wherein (a) is a protection strip filling model and (b) is a protection strip filling mechanical model.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
The following is an explanation of technical terms to which the present invention relates:
strip-type goaf: and a goaf is formed by adopting a strip coal mining method.
Filling rate: and when the goaf is treated, the ratio of the volume of the filling slurry to the residual void volume of the goaf in the treatment range is determined.
Filling without roof contact: and grouting is carried out in the coal house, the injected slurry is not completely filled in the coal house, the slurry is not contacted with the top plate of the goaf, and the filling rate of non-roof-contacting filling can be determined by the proportional relation between the filling height and the height of the coal pillar.
Filling width: when the strip mining area is treated by pier column filling or strip filling, the width of the pier column or the strip is filled.
Filling distance: when the pier columns are filled or the strip filling is used for treating the strip mining area, the distance between the pier columns or the strips is filled.
For a goaf, the crushing expansion coefficient range of coal is usually between 1.05 and 1.20, and the harder the lithology is, the larger the crushing expansion coefficient of coal is; the hardness of the coal is generally 1-4; the repose angle of the stacked body is generally 30-45 degrees, and the stronger the angularity of the coal fragments is, the lower the heterogeneity is, and the larger the repose angle of the stacked body is.
Example 1
What needs to be filled and managed in this embodiment is a certain strip-type goaf of Shandong Jining, and the specific parameters of the goaf include: depth of exploitationH500m, overburden bulk densityγIs 24kN/m3Width of left coal pillara50m, left coal pillar spacingb50m, height of the remaining coal pillarh3m, uniaxial compressive strength of coalσ s 10MPa, internal friction angle of coalφ s Is 30 degrees, and the side pressure coefficient of the elastic-plastic contact surface of the left coal pillarλ s 0.43, coefficient of crushing expansion of coalk1.2 angle of repose of the stackφ r Is 40 degrees, and the modulus of elasticity of the coalE s 1.5GPa, a filling width cc2Is 50 m.
Due to the large width of strip mining, the strip coal pillar left in the strip goaf comprises a plastic area and an elastic nuclear area. The effective size of coal pillar can be reduced in the peeling off of leaving behind the coal pillar, and the stress of coal pillar is left over in the increase, leaves over the coal pillar plastic zone consequently to the extension of leaving behind coal pillar elasticity nuclear district, as shown in fig. 1, because the length of strip coal pillar is longer, consequently peels off the influence of leaving behind coal pillar length and can ignore.
The invention discloses a design method for controlling filling key parameters of a strip type goaf, which comprises the following steps:
step 1, sampling coal rock mass of a left coal pillar in a strip-type goaf, and testing to obtain physical mechanical parameters of the coal rock mass, wherein the physical parameters comprise the coefficient of crushing and expansion of coal and the angle of repose of a stacking body;
step 3, determining the safety coefficient of the left coal pillar according to the maximum stripping depth of the left coal pillar;
step 4, determining whether the goaf needs to be filled and managed according to the safety coefficient of the left coal pillar, and determining a filling and managing mode and a control filling and managing key parameter, wherein the method specifically comprises the following steps:
if the safety coefficient of the left coal pillar is less than 1, selecting a filling treatment mode to fill the goaf, wherein the strip goaf filling treatment mode comprises roof-abutting filling, pier pillar filling and protection of the left coal
The column strip is filled with the filler,
wherein the key filling control parameters of the non-roof-contact filling comprise filling height and uniaxial compressive strength of a non-roof-contact filling body; the key parameters of the control filling of the pier column filling comprise the elasticity modulus of the pier column filling body and the uniaxial compressive strength of the pier column filling body; the key filling control parameters for protecting the left coal pillar strip filling include the left coal pillar strip filling width, the left coal pillar strip filling body elastic modulus and the left coal pillar strip filling body uniaxial compressive strength.
First, the maximum stripping depth of the remaining coal pillar is determined by the following formula:
wherein the content of the first and second substances,d s the maximum stripping depth of the left coal pillar is m;φ r is the angle of repose of the stack in degrees;hthe height of the left coal pillar is m;kthe coefficient of crushing and expansion of coal.
Calculating to obtain the maximum stripping depth of the left coal pillard s =1.49m。
Then, the user can use the device to perform the operation,
wherein the content of the first and second substances,
in the formula (I), the compound is shown in the specification,Fs s for leaving behindThe safety factor of the coal pillar;σ s is the uniaxial compressive strength of coal, in Pa;λ s the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar is the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar;γis the volume weight of overlying strata in the unit of N/m3；HThe unit is m for the mining depth;φ s the internal friction angle of the left coal pillar is expressed as an angle;athe width of the left coal pillar is m;bthe unit is m, which is the distance between the left coal pillars;r s the width of a plastic zone of the left coal pillar is m;Gto make an internal friction angle with the remaining coal pillarφ s The coefficient of interest.
Through the formula of the safety coefficient of the left coal pillar, the calculated safety coefficient of the left coal pillar is 0.76 and less than 1, so that filling treatment is needed.
If the non-roof-contact filling is adopted, the control filling parameters needing to be determined comprise filling height and uniaxial compressive strength of a non-roof-contact filling body;
wherein the filling height is determined by the following formula:
the uniaxial compressive strength of the non-roof-connected filling body is determined by the following formula:
wherein the content of the first and second substances,h c1 is the filling height, and has the unit of m;σ c1 the uniaxial compressive strength of the non-roof-contacted filling body is expressed in Pa.
The following are obtained by calculation: uniaxial compressive strength of filling bodyσ c1 Not less than 2.67MPa and the filling heighth c1 Not less than 2.32 m; the long-term stability of the goaf can be ensured.
If the pier column filling is adopted, the control filling parameters to be determined comprise the elastic modulus of the pier column filling body and the uniaxial compressive strength of the pier column filling body;
the modulus of elasticity of the pier column filling body is determined by the following formula:
the uniaxial compressive strength of the non-roof-connected filling body is determined by the following formula:
in the formula (I), the compound is shown in the specification,E c2 the modulus of elasticity of the pier column filling body is Pa;E s the elastic modulus of the left coal pillar is Pa;c c2 the width of the pier column filling body is m;e c2 the unit is m, and the distance between pier column filling bodies is m;h c2 the filling height of the pier column is m;σ c2 the uniaxial compressive strength of the pier column filling body is Pa;χcorrecting the coefficient for the bearing capacity of the pier of the filling body;Dis the standard sample size of the filling body, and the unit is mm;nto compare the coefficients whenc c2 /h c2 ≥5When the temperature of the water is higher than the set temperature,n=1.4 whenc c2 /h c2 <5，n=1。
Elastic modulus and filling rate of pier column filling bodyc c2 /(c c2+ e c2 ) The strength of the filled pier column is related to the filling ratec c2 /(c c2+ e c2 ) Related to, and filling pier widthc c2 Direct correlation, design fill ratec c2 /(c c2+ e c2 ) 50% of filling widthc c2 50m, then by calculation: modulus of elasticity of fillerE c2 Not less than 0.53GPa, uniaxial compressive strength of filling bodyσ c2 ≥2.50Mpa。
If the left coal pillar strip is protected for filling, the control filling parameters needing to be determined comprise the left coal pillar strip protection filling width, the left coal pillar strip protection filling body elastic modulus and the left coal pillar strip protection filling body uniaxial compressive strength;
the filling width of the protective left coal pillar strip is determined by the following formula:
the modulus of elasticity of the pack for protecting the left coal pillar strips is determined by the following formula:
the uniaxial compressive strength of the filling body for protecting the left coal pillar strips is determined by the following formula:
in the formula (I), the compound is shown in the specification,c c3 the filling width of the left coal pillar strip is protected, and the unit is m;E c3 in order to protect the elastic modulus of the filling body of the left coal pillar strip, the unit is Pa;h c3 the filling height for protecting the filling of the left coal pillar strips is m;σ c3 in order to protect the uniaxial compressive strength of the left coal pillar strip filling body, the unit is Pa; n is a coefficient of analogy whenc c3 /h c3 ≥5When the temperature of the water is higher than the set temperature,n=1.4 whenc c3 /h c3 <5，n =1。
The following results are obtained by calculation: protecting the filling width of the left coal pillar stripc c3 Not less than 9.9m, uniaxial compressive strength of filling bodyσ c3 Greater than or equal to 3.90Mpa, filling modulusE c3 Not less than 0.5Gpa, and can ensure the long-term stability of the goaf.
And finally, the calculated designed filling rate is 40% -77%, and compared with full filling (the filling rate is 100%), the filling amount can be reduced by 23% -60%, which shows that the filling amount can be obviously reduced by adopting the method disclosed by the invention, and the goaf treatment cost is greatly reduced.
Experiments prove that the strip goaf designed by the method can effectively exert the bearing performance of the remaining coal pillar, reduce the filling design amount by 20-60% and greatly reduce the goaf treatment cost by controlling the filling parameters.
Claims (6)
1. A design method for controlling filling key parameters of a strip-type goaf is characterized by comprising the following steps:
step 1, sampling coal rock mass of a left coal pillar in a strip-type goaf, and testing to obtain physical mechanical parameters of the coal rock mass, wherein the physical mechanical parameters comprise the coefficient of crushing and expansion of coal and the angle of repose of a stacking body;
step 2, determining the maximum stripping depth of the left coal pillars according to the measured physical mechanical parameters of the coal rock mass;
step 3, determining the safety coefficient of the left coal pillar according to the maximum stripping depth of the left coal pillar;
step 4, determining whether the goaf needs to be filled and managed according to the safety coefficient of the left coal pillar, and determining a filling and managing mode and a filling and managing control parameter, wherein the filling and managing control parameter specifically comprises the following steps:
if the safety coefficient of the left coal pillar is less than 1, selecting a filling treatment mode to carry out filling treatment on the goaf;
the filling treatment mode comprises non-roof-contacting filling, pier column filling and strip filling for protecting the remaining coal columns, wherein the key parameters of the non-roof-contacting filling for controlling the filling comprise filling height and uniaxial compressive strength of a non-roof-contacting filling body; the key parameters of the control filling of the pier column filling comprise the elasticity modulus of the pier column filling body and the uniaxial compressive strength of the pier column filling body; the key filling control parameters for protecting the left coal pillar strip filling include the left coal pillar strip filling width, the left coal pillar strip filling body elastic modulus and the left coal pillar strip filling body uniaxial compressive strength.
2. The method for designing the key parameters for controlling and filling the strip-type goaf according to claim 1, wherein the maximum stripping depth of the remaining pillars in step 2 is determined by the following formula:
wherein d issThe maximum stripping depth of the left coal pillar is m;
is the angle of repose of the stack in degrees; h is the height of the left coal pillar, and the unit is m; and k is the coefficient of crushing and swelling of the coal.
3. The method for designing key parameters for controlling filling of the strip goaf according to claim 1, characterized in that the safety factor of the remaining pillars in step 3 is determined by the following formula:
wherein the content of the first and second substances,
in the formula, FssThe safety factor of the left coal pillar is high; sigmasIs the uniaxial compressive strength of coal, in Pa; lambda [ alpha ]sThe side pressure coefficient of the elastic-plastic contact surface of the left coal pillar is the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar; gamma is the volume weight of overlying strata and the unit is N/m3(ii) a H is the mining depth, and H is the mining depth,the unit is m;
the internal friction angle of the left coal pillar is expressed as an angle; a is the width of the left coal pillar, and the unit is m; b is the distance between the left coal pillars and the unit is m; r issThe width of a plastic zone of the left coal pillar is m; g is the internal friction angle with the left coal pillar
Coefficient of interest, dsThe maximum stripping depth of the left coal pillar is m, and h is the height of the left coal pillar and m.
4. The design method of key parameters of strip goaf controlled filling according to claim 1, characterized by that for non-roof filling:
the filling height is determined by the following formula:
the uniaxial compressive strength of the non-roof-connected filling body is determined by the following formula:
wherein h isc1Is the filling height, and has the unit of m; sigmac1The uniaxial compressive strength of the non-roof-contacted filling body is expressed in Pa and dsThe maximum stripping depth of the left coal pillar is m;
the internal friction angle of the left coal pillar is expressed as an angle; h is the height of the left coal pillar, and the unit is m; sigmasIs the uniaxial compressive strength of coal, in Pa; lambda [ alpha ]sThe side pressure coefficient of the elastic-plastic contact surface of the left coal pillar is the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar; gamma is the volume weight of overlying strata and the unit is N/m3(ii) a H isThe mining depth is m; k is the coefficient of crushing and swelling of the coal; a is the width of the left coal pillar, and the unit is m; b is the distance between the left coal pillars and the unit is m; r issThe width of a plastic zone of the left coal pillar is m; g is the internal friction angle with the left coal pillar
The coefficient of interest.
5. The design method of key parameters for strip goaf filling control according to claim 1, characterized by that for pier column filling:
the modulus of elasticity of the pier column filling body is determined by the following formula:
the uniaxial compressive strength of the pier stud filling body is determined by the following formula:
in the formula, Ec2The modulus of elasticity of the pier column filling body is Pa; esThe elastic modulus of the left coal pillar is Pa; c. Cc2The width of the pier column filling body is m; e.g. of the typec2The unit is m, and the distance between pier column filling bodies is m; h isc2The filling height of the pier column is m; sigmac2The uniaxial compressive strength of the pier column filling body is Pa; chi is a correction coefficient of the bearing capacity of the pier of the filling body; d is the standard sample size of the filling body, and the unit is mm; n is a coefficient of analogy, when cc2/hc2When n is more than or equal to 5, n is 1.4, when c isc2/hc2<5，n＝1；dsThe maximum stripping depth of the left coal pillar is m;
is the internal friction angle of the remaining coal column in DEG；σsIs the uniaxial compressive strength of coal, in Pa; lambda [ alpha ]sThe side pressure coefficient of the elastic-plastic contact surface of the left coal pillar is the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar; gamma is the volume weight of overlying strata and the unit is N/m3(ii) a H is the mining depth and the unit is m; a is the width of the left coal pillar, and the unit is m; b is the distance between the left coal pillars and the unit is m; r issThe plastic zone width of the remaining coal pillar is given in m.
6. The design method of key parameters of strip goaf filling control according to claim 1, characterized by that, for protecting the strip filling of the left coal pillar:
the filling width of the protective left coal pillar strip is determined by the following formula:
the modulus of elasticity of the pack for protecting the left coal pillar strips is determined by the following formula:
the uniaxial compressive strength of the filling body for protecting the left coal pillar strips is determined by the following formula:
in the formula, cc3The filling width of the left coal pillar strip is protected, and the unit is m; ec3In order to protect the elastic modulus of the filling body of the left coal pillar strip, the unit is Pa; h isc3The filling height for protecting the filling of the left coal pillar strips is m; sigmac3In order to protect the uniaxial compressive strength of the left coal pillar strip filling body, the unit is Pa; n is a coefficient of analogy, when cc3/hc3When n is more than or equal to 5, n is 1.4, when c isc3/hc3<5，n＝1，dsThe maximum stripping depth of the left coal pillar is m;
the internal friction angle of the left coal pillar is expressed as an angle; sigmasIs the uniaxial compressive strength of coal, in Pa; lambda [ alpha ]sThe side pressure coefficient of the elastic-plastic contact surface of the left coal pillar is the side pressure coefficient of the elastic-plastic contact surface of the left coal pillar; gamma is the volume weight of overlying strata and the unit is N/m3(ii) a H is the mining depth and the unit is m; a is the width of the left coal pillar, and the unit is m; b is the distance between the left coal pillars and the unit is m; r issThe plastic zone width of the left coal pillar is m, EsThe unit of the elasticity modulus of the left coal pillar is Pa, and the unit of the elasticity modulus of the left coal pillar is Chi, and the unit of the elasticity modulus of the left coal pillar is a correction coefficient of the bearing capacity of the pier of the filling body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111245249.5A CN113688462B (en) | 2021-10-26 | 2021-10-26 | Design method for controlling filling key parameters of strip-type goaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111245249.5A CN113688462B (en) | 2021-10-26 | 2021-10-26 | Design method for controlling filling key parameters of strip-type goaf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113688462A CN113688462A (en) | 2021-11-23 |
| CN113688462B true CN113688462B (en) | 2022-03-15 |
Family
ID=78587980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111245249.5A Active CN113688462B (en) | 2021-10-26 | 2021-10-26 | Design method for controlling filling key parameters of strip-type goaf |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113688462B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110119584A (en) * | 2019-05-20 | 2019-08-13 | 中国矿业大学 | A kind of work noodles formula interval filling mining design method |
| AU2020100234A4 (en) * | 2020-02-18 | 2020-03-26 | Xi'an University Of Science And Technology | Method for water conservation mining by filling flexible strip |
| CN111978018A (en) * | 2020-08-07 | 2020-11-24 | 中煤科工集团西安研究院有限公司 | Size and form control method for high-concentration slurry filling pier column in cavity type goaf |
| CN112446143A (en) * | 2020-11-17 | 2021-03-05 | 山东科技大学 | Strip filling mining parameter design method under thick unconsolidated formation and thin bedrock |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105912810B (en) * | 2016-04-29 | 2019-02-19 | 中国矿业大学 | A kind of filling with fully mechanized mining is mixed adopts face transition bracket supporting parameter design method |
| CN107665285B (en) * | 2017-10-31 | 2020-09-08 | 河南理工大学 | Analytical method for determining reasonable position of coal roadway under left coal pillar based on sensitive factors |
| CN109113744B (en) * | 2018-09-04 | 2019-11-05 | 中国矿业大学 | A kind of external supporting substituted room formula pillar recovery method |
| CN111206956B (en) * | 2020-01-10 | 2021-03-02 | 中国矿业大学 | Method for filling and reinforcing left coal pillars in goaf by room-type coal mining method |
-
2021
- 2021-10-26 CN CN202111245249.5A patent/CN113688462B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110119584A (en) * | 2019-05-20 | 2019-08-13 | 中国矿业大学 | A kind of work noodles formula interval filling mining design method |
| AU2020100234A4 (en) * | 2020-02-18 | 2020-03-26 | Xi'an University Of Science And Technology | Method for water conservation mining by filling flexible strip |
| CN111978018A (en) * | 2020-08-07 | 2020-11-24 | 中煤科工集团西安研究院有限公司 | Size and form control method for high-concentration slurry filling pier column in cavity type goaf |
| CN112446143A (en) * | 2020-11-17 | 2021-03-05 | 山东科技大学 | Strip filling mining parameter design method under thick unconsolidated formation and thin bedrock |
Non-Patent Citations (3)
| Title |
|---|
| A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions;Guo Weibin 等;《SUSTAINABILITY》;20170602;第9卷(第06期);第1-17页 * |
| 条带采空区稳定性分析与治理对策研究;刘义新 等;《煤矿开采》;20141231;第19卷(第06期);第81-83页 * |
| 煤矿采空区充填墩台承载特性试验;朱世彬;《煤田地质与勘探》;20201031;第48卷(第05期);第106-112页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113688462A (en) | 2021-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xie et al. | Investigations into stress shell characteristics of surrounding rock in fully mechanized top-coal caving face | |
| Wu et al. | Large deformation characteristics and treatment effect for deep bias tunnel in broken phyllite: A case study | |
| Li et al. | Centrifuge investigation into the effect of new shield tunnelling on an existing underlying large-diameter tunnel | |
| CN106934178B (en) | Pre-mining impact risk pre-evaluation method for island working surface | |
| Wang et al. | The controlling effect of thick-hard igneous rock on pressure relief gas drainage and dynamic disasters in outburst coal seams | |
| Wang et al. | A combined supporting system based on filled-wall method for semi coal-rock roadways with large deformations | |
| CN106528963A (en) | Design method for row space between pressure relief boreholes | |
| Esterhuizen et al. | The ground response curve, pillar loading and pillar failure in coal mines | |
| CN113688462B (en) | Design method for controlling filling key parameters of strip-type goaf | |
| CN102102518B (en) | Top coal caving coordinated mining method for thick coal seam under dam body of reservoir | |
| CN106815445A (en) | A kind of shallow buried coal seam section coal pillar LOAD FOR model and its computational methods | |
| Wu et al. | Deformation characteristics and mechanism of deep subsize coal pillar of the tilted stratum | |
| Zhong et al. | Assessment of experimental friction parameters and contact property of pipe string for the estimation and verification of a solution for pipe stuck in the China's first rock pipe jacking | |
| CN108570889A (en) | A kind of the Resistant heave structure and construction method of intumescent flexibel rock non-fragment orbit cutting bedding | |
| Salamatpoor et al. | Evaluation of Babolsar sand behaviour by using static triaxial tests and comparison with case history | |
| CN113704863B (en) | Method for designing key parameters for controlling filling of room-and-column type goaf | |
| Nordas et al. | Study into the TBM jamming hazard in Opalinus clay | |
| CN107944148A (en) | A kind of critical Full Ratio design method of filling mining | |
| CN208219300U (en) | A kind of Resistant heave structure of intumescent flexibel rock non-fragment orbit cutting bedding | |
| CN113642089B (en) | Method for determining deformation and reinforcement range of surrounding stratum in shield tunneling | |
| CN106194185A (en) | Under hydraulic pressure effect, thick aqueous soil layer sand control coal and rock pillar for safety stays equipment, method | |
| CN104727298A (en) | Vacuum preloading soft soil foundation treatment method | |
| CN115238482A (en) | Method for calculating supporting pressure of large longitudinal slope rectangular tunnel excavation face | |
| CN115188515A (en) | Uranium tailing multilayer covering treatment method and system based on waste rock covering | |
| Zhu et al. | Study on the effect of rock stratum structure on the stability of weakly cemented layered floor and the floor control measures: A case study of Meihuajing Mine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |