CN112036070B - Method for determining gob-side entry retaining roadside filling hysteresis cycle length - Google Patents
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Abstract
The invention relates to the field of coal mine roadway support, in particular to a method for determining the roadside filling hysteresis cycle length of a gob-side entry retaining. The method only needs to provide the compressive strength and the tensile strength of the single shaft of the direct roof, realizes scientific and quantitative selection and analysis of the roadside filling cycle length of the gob-side entry retaining by calculating the direct roof tensile stress under the condition of different lagging empty-head distances by using a difference method, and determines the proper filling cycle length by comparing the tensile stress obtained by calculation in each scheme with the maximum tensile stress of the roof.
Description
Technical Field
The invention relates to the field of coal mine roadway support, in particular to a method for determining the roadside filling hysteresis cycle length of a gob-side entry retaining.
Background
In recent years, the gob-side entry retaining pillar-free mining technology has been developed into one of green, safe and efficient mining technologies for coal resources. The roadside packing gob-side entry retaining is one of the most widely applied gob-side entry retaining processes at present. When the roadside packing gob-side entry retaining is carried out, the roadside packing body is generally constructed by lagging behind a working face end support by a plurality of distances. Numerous research entry retaining practices show that whether the top plate of the filling area is stable or not is one of the key factors for success of the roadside filling gob-side entry retaining. At present, the daily advancing length of a high-yield and high-efficiency fully-mechanized mining face in China is often larger, the daily advancing length is limited by the factors such as early strength performance, solidification time, resistance increasing speed and the like of the existing filling material, and the gob-side entry retaining roadway filling lag is further increased when the roadside filling body possibly cannot be built in time or the built roadside filling body cannot reach the designed support resistance in time. However, when the gob-side entry retaining roadway-side filling lagging jack distance is too large, the shallow roof in the area may be unstable under the action of tensile stress. The gob-side entry retaining roadside filling lagging goaf-top area mainly comprises a gob-side entry retaining roadside filling circulation length and a pedestrian channel width behind the support, and the pedestrian channel width is generally 0.8 m. Therefore, the size of the gob-side entry retaining roadside filling cycle length is a bottleneck for further improving the construction speed of the gob-side entry retaining roadside filling body. On the premise of ensuring safety, the reasonable gob-side entry retaining roadside filling cycle length is determined to be the premise of safe and rapid implementation of roadside filling gob-side entry retaining. However, no published report of a method and theory for determining the roadside packing cycle length of the related gob-side entry retaining is available at home and abroad.
Disclosure of Invention
The invention aims to provide a method for determining the roadside packing hysteresis cycle length of a gob-side entry retaining.
The purpose of the invention is realized by the following ways: a method for determining the length of a gob-side entry retaining roadside filling hysteresis cycle comprises the following specific steps:
a. acquiring gob-side entry retaining production geological condition data of a mine to be detected, wherein the gob-side entry retaining production geological condition data comprises a rock stratum pressure load borne by the upper part and contains the dead weight of a direct roof rock stratum, a supporting load provided by a coal wall supporting section of a lower boundary stope face, a supporting load provided by an end bracket supporting section and a supporting load provided by an entry retaining wall body section, constructing a gob-side entry retaining filling area direct roof mechanics model according to the data, and the length of the model, the length of the coal wall supporting section, the length of the bracket supporting section, the length of an area to be filled and the length of the entry retaining wall body section are L, L respectively1、L2、L3、L4Carrying out grid division on the direct top mechanical model of the gob-side entry retaining filling area, and dividing longitude and latitude grids of a direct top along the direction of the roadway and in the vertical direction;
b. b, determining overburden rock pressure q along the gob-side entry retaining immediate roof and supporting stress q in a certain range in front of the working face according to the mine gob-side entry retaining production geological conditions, rock mechanical parameter data of surrounding rocks and working face equipment working parameters measured in the step a1End bracket supporting section supporting force q2Support force q of filling wall4(ii) a Wherein
In the formula EnIs the elastic modulus, h, of the nth formationnThickness of the n-th rock layer, γnIs the volume force of the nth formation;
c. according to different distances between a roadside area to be filled and a working face end support, namely different lag space-head distances, determining a roadside filling lag space-head distance scheme by taking the lag space-head distance of the interval bm as an inter-group distance, and considering that the difference value of each level of the lag space-head distances is equal to the cut depth of a coal mining machine, so that the numerical value of the cut depth of the coal mining machine is obtained; gradually increasing the roadside filling lag empty-top distance within the limit empty-top distance range, and respectively calculating the roof stress of the filling area by using a difference method, thereby summarizing the relation between the stress distribution and the roadside filling lag empty-top distance of the gob-side entry retaining and obtaining the corresponding maximum tensile stress Tmax；
d. Calculating the maximum tensile stress T corresponding to each different roadside filling lagging space-head distance schememaxFor the associated maximum tensile stress TmaxThe ultimate tensile strength sigma of the direct roof of the gob-side entry retaining filling area under the schemetComparing, if the maximum tensile stress T in the schememaxNot exceeding immediate ceiling ultimate tensile strength sigmatIf the maximum lag-behind empty-top distance l is greater than the maximum lag-behind empty-top distance l, the scheme is determined to be feasible, otherwise, the scheme is not feasible, and the maximum lag-behind empty-top distance l is determined to be filled beside the gob-side entry retaining roadwaymax；
e. Filling the working gob-side entry retaining roadside with maximum lag empty-top distance lmaxSubtracting chargingAnd (5) the minimum pedestrian width behind the filling area support, so that the gob-side entry retaining roadside filling cycle length is obtained.
As a further limitation of the scheme, the calculation of the relationship between the top plate stress distribution of the filling area and the gob-side entry retaining roadside filling lagging space-head distance by adopting a difference method specifically comprises the following steps:
the formula:
in the formula: l is the length of the selected mechanical model of the direct roof of the gob-side entry retaining filling area, L1Length of supporting segment for coal wall, L2Length of support section for the stent, L3Is the length of the region to be filled, L4The length of the wall body section of the entry retaining; q is the overburden pressure load concentration of the direct roof of the gob-side entry retaining, the dead weight of the direct roof containing rock stratum, and q1The supporting load concentration of the coal wall supporting section of the lower boundary stope face q2Support load concentration for the end support section, q4Providing support load concentration for the entry retaining wall sections.
The invention discloses a method for determining the filling hysteresis cycle length beside a gob-side entry retaining roadway, which overcomes the blindness of top plate empty-top distance selection of a gob-side entry retaining roadway filling area, realizes quantitative analysis of empty-top distance selection, only needs to provide direct top uniaxial compressive strength and ultimate tensile strength without elastic modulus, Poisson's ratio, cohesive force, internal friction angle, shearing expansion angle and other rock mechanical parameters, avoids the complexity of mechanical testing, is simple and easy to implement, realizes scientific and quantitative selection analysis of the filling cycle length beside the gob-side entry retaining roadway by calculating direct top tensile stress under different hysteresis empty-top distance conditions by using a difference method, ensures the condition of avoiding overlarge empty-top distance by comparing the tensile stress calculated in each scheme with the ultimate tensile strength of the top plate, ensures the minimum pedestrian width under the condition of ensuring reasonable empty-top distance, thereby determining the proper filling cycle length, the method avoids the problems of instability of the top plate of the filling area and the like caused by large empty-top distance and filling cycle length, and provides a simpler and more reliable method for realizing roadway safety and success of roadside filling gob-side entry retaining.
Drawings
The invention is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a section of a working surface of a gob-side entry retaining along the strike in an embodiment of the invention;
FIG. 2 is a force model of gob-side entry retaining direct roof along the strike in the embodiment of the present invention;
FIG. 3 is a schematic diagram of a differential mesh of a mechanical model of a direct roof of a gob-side entry retaining filling area in the embodiment of the present invention;
FIG. 4 is a schematic diagram of a differencing method in an embodiment of the invention;
fig. 5 is a horizontal stress cloud diagram of the top plate of the gob-side entry retaining filling area at different lagging deadhead distances in the embodiment of the invention.
Detailed Description
The invention will be described in detail with reference to the following drawings and engineering practice:
the section of the gob-side entry retaining working face of the working face of a certain coal mine 1103 along the trend is shown in fig. 1, the height of the overlying strata is H m, the length of the coal wall supporting segment, the length of the bracket supporting segment, the length of the region to be filled and the length of the entry retaining wall body are L, L respectively1、L2、L3、L4。
Establishing a mechanical model of the gob-side entry retaining direct roof of a working face of a certain coal mine 1103 along the trend and carrying out grid division, wherein the pressure of an overlying rock layer of the gob-side entry retaining direct roof is q, and the supporting stress in a certain range in front of the working face is q, as shown in fig. 2 and 3 respectively1The supporting force of the hydraulic support at the end of the working face is q2The supporting force of the filling wall is q4。
q1、q4Is determined by the formula (1) according to the mechanical balance.
In the formula: l, L1、L2、L3、L4Length of model taken by model and coal wall supportLength of segment, length of support supporting segment, length of region to be filled and length of wall segment of entry retaining wall
And solving the stress function by adopting a difference method and programming by means of mathematical software. Taking a part of the model to solve the description (shown in fig. 4), the grid widths in the direction of X, Y are equal, A, B is the node number,
as a function of stress
A stress value with a node number i (i ═ 1, 2, 3, 4. -).
The steps of solving the direct top stress component by the difference method are as follows:
(1) arbitrarily selecting a node on the boundary as a base point A, and enabling
Then calculating all nodes on the boundary according to the moment of the surface force and the sum of the surface force
Value and what is required for formula (3)
Value and
value, i.e.
The left side of the equation is the boundary outer virtual node and the right side is the real node.
(2) At each virtual node on the boundary using equation (3)
Value is usedAt corresponding nodes within the boundary
A value.
(3) At node 0, the difference equation is
One such differential equation may be established for each node within the boundary and solved concurrently, thereby solving for each node
The value is obtained.
(4) Calculating the virtual nodes of a line outside the boundary according to the formula (3)
The value is obtained.
(5) The stress component is calculated according to equations (5) to (7).
Similarly, other node stress components can be obtained. Due to the fact that the number of nodes is large, calculation workload is large when multiple equations are solved simultaneously, and programming solving needs to be conducted by means of mathematical software according to the calculation steps.
According to geological drilling data, the average thickness of the working face of a certain coal mine 1103 is 1.3m, the burial depth is 210m, and the working face is a fully mechanized mining face of a thin coal seam. The dip angle of the coal seam is 0-20 degrees and 10 degrees on average. The direct top plate is mudstone, the old top is fine sandstone, and the direct bottom and the old bottom are both mudstone. 1103 end bracket ZT4000/14/30 model of working face, hydraulic bracket beam length of 5.5m, supporting strength of 0.6MPa, coal mining machine depth of 0.6m, working face period pressure step distance of 15 m. The direct top thickness is 4.5m, the tensile strength is 0.35MPa, and the compressive strength is 16.1 MPa. The 1103 transportation roadway roadside packing body is constructed by high-water rapid-hardening materials with the water-cement ratio of 1.5: 1, and the width is 1.2 m. In order to facilitate the construction of the roadside filling body, the minimum pedestrian width of the test support air return is 0.8 m.
From this, it was determined that the overburden thickness includes (4.5m +10m), taking an average volume weight of 2.5t/m3The overburden load is 0.3625MPa, and L is taken110 m. As can be seen from the above, L2＝5.5m，L3+L4＝15m。
And substituting the data into the calculation to obtain horizontal stress and vertical stress components of each node of the direct roof of the gob-side entry retaining filling area under different lag empty-roof distances, and obtaining a distribution cloud chart as shown in fig. 5.
As can be seen from the figure 5 of the drawings,
(1) when the lagging jack-up distance is not more than 2.5m, the upper rock stratum of the direct roof is pulled and the lower rock stratum is pressed along the thickness direction of the direct roof, and the contour line of the middle part is sparse. The maximum value of horizontal compressive stress appears in the middle of the lower boundary bracket area, and the maximum value of horizontal tensile stress appears in the middle of the upper boundary of the bracket area.
(2) When the hysteresis space-head distance is larger than 2.5m and smaller than 4.5m, along the thickness direction of the direct roof, the upper rock stratum of the direct roof space-head area is compressed, the lower rock stratum of the space-head area is pulled, the upper rock stratum of the direct roof support area is compressed, and the lower rock stratum of the support area is pulled.
(3) When the lag space-to-head distance is larger than 4.5m, the lower rock stratum of the direct roof is pulled along the thickness direction of the direct roof, the upper rock stratum is pressed, and the contour line of the middle part is sparse. The maximum value of horizontal tensile stress appears in the middle of the lower boundary empty top area, and the maximum value of horizontal compressive stress appears in the middle of the upper boundary of the empty top area.
As the hysteresis space increases, the maximum tensile stress at the lower portion of the direct headspace region gradually increases, and the detailed results thereof are shown in the following table.
From the fact that the tensile strength of the immediate roof was 0.35MPa, it was found that when the hysteresis space length reached 3.5m, the immediate roof lower portion of the filled region was broken by pulling. Therefore, the filling lagging space top distance of the gob-side entry retaining roadway of the working face of a certain coal mine 1103 cannot exceed 3.5m, the minimum pedestrian width behind the filling area support is 0.8m, the filling circulation length of the gob-side entry retaining roadway does not exceed 2.7m, the filling circulation distance is taken as integral multiple of the cut depth of the coal mining machine, and the filling circulation distance of the gob-side entry retaining roadway of the working face of the coal mine 1103 is determined to be 2.4 m.
Claims (2)
1. A method for determining the length of a gob-side entry retaining roadside filling hysteresis cycle is characterized by comprising the following steps: the method comprises the following specific steps:
a. acquiring gob-side entry retaining production geological condition data of a mine to be detected, wherein the gob-side entry retaining production geological condition data comprises a rock stratum pressure load borne by the upper part and contains the dead weight of a direct roof rock stratum, a supporting load provided by a coal wall supporting section of a lower boundary stope face, a supporting load provided by an end bracket supporting section and a supporting load provided by an entry retaining wall body section, constructing a gob-side entry retaining filling area direct roof mechanics model according to the data, and the length of the model, the length of the coal wall supporting section, the length of the bracket supporting section, the length of an area to be filled and the length of the entry retaining wall body section are L, L respectively1、L2、L3、L4Carrying out grid division on the direct top mechanical model of the gob-side entry retaining filling area, and dividing longitude and latitude grids of a direct top along the direction of the roadway and in the vertical direction;
b. b, determining overburden rock pressure q along the gob-side entry retaining immediate roof and supporting stress q in a certain range in front of the working face according to the mine gob-side entry retaining production geological conditions, rock mechanical parameter data of surrounding rocks and working face equipment working parameters measured in the step a1End bracket supporting section supporting force q2Support force q of filling wall4(ii) a Wherein
In the formula EnIs the elastic modulus, h, of the nth formationnThickness of the n-th rock layer, γnIs the volume force of the nth formation;
c. according to different distances between a roadside area to be filled and a working face end support, namely different lag space-head distances, determining a roadside filling lag space-head distance scheme by taking the lag space-head distances of an interval b m as an inter-group distance, and considering that the difference value of each level of the lag space-head distances is equal to the cut depth of a coal mining machine, so that the numerical value of the cut depth of the coal mining machine is obtained; gradually increasing the roadside filling lag empty-top distance within the limit empty-top distance range, and respectively calculating the roof stress of the filling area by using a difference method, thereby summarizing the relation between the stress distribution and the roadside filling lag empty-top distance of the gob-side entry retaining and obtaining the corresponding maximum tensile stress Tmax；
d. Calculating the maximum tensile stress T corresponding to each different roadside filling lagging space-head distance schememaxFor the associated maximum tensile stress TmaxThe ultimate tensile strength sigma of the direct roof of the gob-side entry retaining filling area under the schemetComparing, if the maximum tensile stress T in the schememaxNot exceeding immediate ceiling ultimate tensile strength sigmatIf the maximum lag-behind empty-top distance l is greater than the maximum lag-behind empty-top distance l, the scheme is determined to be feasible, otherwise, the scheme is not feasible, and the maximum lag-behind empty-top distance l is determined to be filled beside the gob-side entry retaining roadwaymax；
e. Filling the working gob-side entry retaining roadside with maximum lag empty-top distance lmaxAnd subtracting the minimum pedestrian width behind the filling area support to obtain the gob-side entry retaining roadside filling cycle length.
2. The method for determining the gob-side entry retaining roadside filling hysteresis cycle length according to claim 1, wherein the calculating of the relationship between the top plate stress distribution of the filling area and the gob-side entry retaining roadside filling hysteresis space-head distance by using the difference method is specifically as follows:
the formula:
in the formula: l is the length of the selected mechanical model of the direct roof of the gob-side entry retaining filling area, L1Length of supporting segment for coal wall, L2Length of support section for the stent, L3Is the length of the region to be filled, L4The length of the wall body section of the entry retaining; q is the overburden pressure load concentration of the direct roof of the gob-side entry retaining, the dead weight of the direct roof containing rock stratum, and q1The supporting load concentration of the coal wall supporting section of the lower boundary stope face q2Support load concentration for the end support section, q4Providing support load concentration for the entry retaining wall sections.
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| CN107035405A (en) * | 2016-12-06 | 2017-08-11 | 太原理工大学 | One kind is used for the double filling wall constructions of gob side entry retaining and cuts top pressure relief method |
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| CN109779632A (en) * | 2019-01-15 | 2019-05-21 | 山东科技大学 | A kind of gob-side entry retaining support system coordination deformation quantifying design method |
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| CN106837408B (en) * | 2017-03-20 | 2018-08-21 | 中国矿业大学 | A kind of coal seam stope advantage gas migration channel staged construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107035405A (en) * | 2016-12-06 | 2017-08-11 | 太原理工大学 | One kind is used for the double filling wall constructions of gob side entry retaining and cuts top pressure relief method |
| CN108678769A (en) * | 2018-05-16 | 2018-10-19 | 山东科技大学 | Deep Gateway anchor note cuts top master control and stays lane method |
| CN109779632A (en) * | 2019-01-15 | 2019-05-21 | 山东科技大学 | A kind of gob-side entry retaining support system coordination deformation quantifying design method |
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| Title |
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| Field experiment on directional roof presplitting for pressure relief of retained roadways;Xzab C 等;《International Journal of Rock Mechanics and Mining Sciences》;20200817;第134卷;第1-13页 * |
| 沿空留巷上覆岩层关键块稳定性力学分析及巷旁充填体宽度确定;李迎富 等;《岩土力学》;20120430;第33卷(第4期);第1134-1140页 * |
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