CN115169752B - Coal mine roof initial pressure step pitch prediction method based on virtual work theory - Google Patents

Coal mine roof initial pressure step pitch prediction method based on virtual work theory Download PDF

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CN115169752B
CN115169752B CN202211076186.XA CN202211076186A CN115169752B CN 115169752 B CN115169752 B CN 115169752B CN 202211076186 A CN202211076186 A CN 202211076186A CN 115169752 B CN115169752 B CN 115169752B
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杨彦群
郭伟
李丽绒
李竹
王浩
冯国瑞
董志勇
戚庭野
杨宗义
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Abstract

The invention belongs to the field of mine pressure and rock stratum control, and discloses a method for predicting the initial pressure step pitch of a coal mine roof based on a virtual work theory. The method is simple and convenient, and can effectively predict the initial pressure step distance of the top plate, guide underground supporting and protecting work and reduce the damage of personnel and equipment caused by initial pressure.

Description

Coal mine roof initial pressure step pitch prediction method based on virtual work theory
Technical Field
The invention belongs to the field of mine pressure and rock stratum control, and particularly relates to a method for predicting the primary pressure step pitch of a coal mine roof based on a virtual work theory.
Background
The basic roof is the roof located directly above or above the coal seam, also known as the old roof. When the working face is pushed forward from the open-off cut, the exposed area of the top plate is enlarged, the direct roof is collapsed to fill the goaf, and the old roof is still supported on the two coal walls completely to form a double-support beam component. When the span of the plate girder is increased to a certain range along with the advancing of the working face, the old roof is collapsed due to the self weight of the old roof and the action of the overlying rock stratum. At this time, the working face is no longer under the shield of the old roof, the roof rapidly sinks and is broken, and the first large-area caving of the old roof of the goaf is generally called primary caving. The pressure of the working face is increased due to the primary collapse of the old roof.
The roof accident is one of the main accidents in the underground coal mine, the damage is great, and the initial pressure is stronger and more harmful than the periodic pressure, so that the supporting and pressure reducing work can be reasonably carried out by effectively predicting the initial pressure step of the roof, and the accidents of personnel and equipment are reduced.
Disclosure of Invention
In view of the above, the invention aims to provide a method for predicting the initial pressure step pitch of a coal mine roof based on the virtual work theory, which is simple and convenient, can effectively predict the initial pressure step pitch of the roof, guides underground supporting and protecting work, and reduces the damage to personnel and equipment caused by the initial pressure.
In order to achieve the purpose of the invention, the technical scheme is as follows:
a coal mine roof initial pressure step pitch prediction method based on a virtual work theory is characterized by comprising the following steps of:
s1, determining the length of a working face, the width of a transportation gateway and a return air gateway, the average thickness of a top plate and the mechanical characteristics of top plate rocks according to the actual condition of the working face, wherein the top plate reaches a plastic limit state along with the propulsion of the working face in an underground coal mine, and a plastic hinge line in a four-slope top form appears;
s2, calculating virtual work done by external force:
virtual work done by external forceWVolume and load of "four-pitched roof" obtained by the cut-and-fill methodqThe product of (a) and (b) yields:
Figure 591641DEST_PATH_IMAGE001
wherein the content of the first and second substances,
Figure 243202DEST_PATH_IMAGE002
equal to the volume of the destructive mechanism in the form of virtual displacement;
substituting the parameters to obtain:
Figure 757360DEST_PATH_IMAGE003
；
in the formula (I), the compound is shown in the specification,
W: the virtual work done for the external force is,
δ: the deflection of the center of the top plate,
a: the sum of the length of the working face and the width of the two gate grooves,
b: the step pitch is pressed for the first time,
q: covering a load on the top plate;
s3, calculating total virtual dissipation energy of internal force:
the total internal force virtual dissipation energy is the work of the limit bending moment at the top of the four-slope top and the plastic hinge line of the plate frame on the relative corner, namely:
Figure 886990DEST_PATH_IMAGE004
in the formula (I), the compound is shown in the specification,
T: the internal force is always deficient and energy is dissipated,
k: the number of the plastic twisted wires is large,
l: the length of the plastic twisted wire is as long as,
φ: the relative angle of rotation is such that,
M p : plastic twisted wire unit length ultimate bending moment;
solving the relative rotation angle of the plastic twisted line by using space geometry:
the relative angle of rotation of the plastic hinge line EF,
Figure 701362DEST_PATH_IMAGE005
，
relative angles of rotation of the plastic hinge lines AE, BE, CF and DF,
Figure 382879DEST_PATH_IMAGE006
，
the relative rotation angles of the plastic twisted lines AB and CD,
Figure 384333DEST_PATH_IMAGE007
，
the relative rotation angles of the plastic strand lines AC, BD,
Figure 317654DEST_PATH_IMAGE008
，
substituting the above parameters to obtain total internal force deficiency energy dissipationTThe calculation formula of (c) is:
Figure 720954DEST_PATH_IMAGE009
s4, obtaining the corresponding relation between the ultimate load and the plate size in the plastic limit state, and the physical and mechanical properties according to the condition that the virtual work done by the external force is equal to the total virtual dissipation of the internal force;
order toW=TTo be solved to
Figure 573372DEST_PATH_IMAGE010
，
Has an average thickness ofhThe top plate of (a) is provided,
Figure 62122DEST_PATH_IMAGE011
，
Figure 533555DEST_PATH_IMAGE012
is obtained by substituting the yield limit of the roof strata
Figure 791361DEST_PATH_IMAGE013
；
The upper formula is the load under the plastic limit stateqRepresentative value of twisted wiretThe corresponding relationship of (a) to (b),tbyqTaking the minimum to obtain:
Figure 80260DEST_PATH_IMAGE014
，
taking a positive value:
Figure 56306DEST_PATH_IMAGE015
substitution to obtain
Figure 65850DEST_PATH_IMAGE016
；
In the formula (I), the compound is shown in the specification,
Figure 709321DEST_PATH_IMAGE017
the limit load is the limit load in the plastic limit state;
s5, calculating the step pitch of the first pressure:
the length of the plate is long along with the advance of the working face under the coal minebWhen the critical value is reached, the top plate enters a plastic limit state, and the load on the top plate is taken as the limit load, namelyq=q Pole The load on the top plate, the sum of the length of the working face and the width of the two crossroads, the physical and mechanical properties of the rock stratum of the top plate and the average thickness of the top plate are knownhThe length of the plate can be calculated by the following formulabValue of (2), plate lengthbNamely the initial pressure step distance, the calculation formula is as follows:
Figure 637963DEST_PATH_IMAGE018
wherein, the first and the second end of the pipe are connected with each other,
Figure 101305DEST_PATH_IMAGE019
，hthe average thickness of the top plate is,qan overburden is applied to the roof.
The beneficial effects of the invention are: the invention provides a method for predicting the initial pressure step of a coal mine roof based on a virtual work theory, which comprises the steps of firstly determining the length of a working face, the width of a transportation gate way and a return air gate way, the average thickness of the roof and the mechanical characteristics of roof rocks according to the actual condition of the working face, then determining the load of an overlying rock layer supported by the roof of the working face according to a key layer theory, leading the roof to reach a plastic limit state along with the propulsion of the working face, generating a plastic hinge line in a four-slope roof form, and predicting the initial pressure step of the roof according to the corresponding relation between the load when the roof enters the plastic limit state and the size of the roof when the plastic hinge line appears. The method is simple and convenient, and can effectively predict the initial pressure step distance of the top plate, guide underground supporting and protecting work and reduce the damage of personnel and equipment caused by initial pressure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a top view of a top plate in a plastic limit state, wherein the BA direction is a working surface advancing direction;
FIG. 2 is a schematic view of the volume of the four-slope top obtained by the cutting and filling method;
FIG. 3 is a perspective view of the top plate in a plastic limit state;
FIG. 4 shows the relative rotation angles of plastic twisted lines AE, BE, CF, DFθSolving an auxiliary graph;
FIG. 5 shows the relative rotation angle of the plastic hinge line EFαA schematic view;
FIG. 6 shows the opposite rotation angle of plastic hinge line AB and CDφA schematic diagram;
FIG. 7 shows the relative rotation angle of the plastic twisted lines AC and BDβSchematic representation.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1 to 7, a method for predicting the initial pressure step of a coal mine roof based on the virtual work theory, which assumes that the uniform thickness of the roof does not affect the stress analysis of the plate, comprises the following steps:
s1, determining the length of a working face, the width of a transportation gateway and a return air gateway, the average thickness of a top plate and the mechanical characteristics of top plate rocks according to the actual condition of the working face, wherein the top plate reaches a plastic limit state along with the propulsion of the working face in an underground coal mine, and a plastic hinge line in a four-slope top form appears;
s2, calculating virtual work done by external force:
virtual work done by external forceWVolume and load of "four-pitched roof" obtained by the cut-and-fill methodqThe product of (a) yields:
Figure 914541DEST_PATH_IMAGE001
wherein, the first and the second end of the pipe are connected with each other,
Figure 412518DEST_PATH_IMAGE002
equal to the volume of the destructive mechanism in the form of virtual displacement;
the cut-and-fill method is characterized in that the volume of the triangular prism is subtracted by the volume of two tetrahedrons to obtain the volume of the' four-slope top
Figure 918586DEST_PATH_IMAGE020
Virtual work done by external force
Figure 728279DEST_PATH_IMAGE021
；
In the formula (I), the compound is shown in the specification,
δ: the flexibility of the center of the top plate,
a: the sum of the length of the working surface and the width of the two crossroads (the transportation crossroad and the return air crossroad),
b: the step pitch is pressed for the first time,
q: covering a load on the top plate;
s3, calculating total internal force virtual dissipation energy:
the total virtual dissipation energy of the internal force is the work of the limit bending moment at the tops of the four slope tops and the plastic hinge lines of the plate frames on the relative corner, namely:
Figure 345205DEST_PATH_IMAGE004
in the formula (I), the compound is shown in the specification,
T: the general deficiency of internal force consumes the energy to dissipate,
k: the number of the plastic twisted wires is large,
l: the length of the plastic twisted wire is as long as,
φ: the relative angle of rotation is such that,
M p : plastic twisted wire unit length ultimate bending moment;
the relative rotation angles of the plastic twisted lines are solved by using the space geometry, and the actual relative rotation angles of the plastic twisted lines AE, BE, CF and DF are shown in figure 3θEstablishing a coordinate system as shown in FIG. 4,θthe included angle between the face ABE 'and the face BDF' E 'is obtained, the normal vector of the face ABE' and the normal vector of the face BDF 'E' are respectively obtained, and the included angle between the normal vectors and the dihedral angle is obtained through solution
Figure 697689DEST_PATH_IMAGE022
The lengths of the plastic twisted lines AE, BE, CF and DF being equal to
Figure 374658DEST_PATH_IMAGE023
Therefore, the virtual work done by the four plastic twisted wires is:
Figure 547013DEST_PATH_IMAGE024
plastic hinge line EF relative angleαCalculated from a cross-section perpendicular to the direction of advancement of the working surface, according to the infinitesimal nature of the virtual displacement
Figure 967630DEST_PATH_IMAGE025
Virtual work done by plastic hinge EF
Figure 299254DEST_PATH_IMAGE026
；
Plastic twisted line AB, CD relative cornerφDerived from a section parallel to the direction of advancement of the working surface, and having the same principle
Figure 147125DEST_PATH_IMAGE027
Deficiency of the Qi
Figure 72355DEST_PATH_IMAGE028
；
In the same way, the relative rotation angle of the plastic twisted line AC and BD
Figure 31084DEST_PATH_IMAGE029
Deficiency of the Qi
Figure 92581DEST_PATH_IMAGE030
；
Figure 111353DEST_PATH_IMAGE031
S4, obtaining the corresponding relation between the ultimate load and the plate size in the plastic limit state, and the physical and mechanical properties according to the condition that the virtual work done by the external force is equal to the total virtual dissipation of the internal force;
based on the principle of virtual workW=TTo be solved to
Figure 523879DEST_PATH_IMAGE032
Because of infinitesimal virtual displacement, the deflection of the top plate center is infinitely close to zero, so that the following conditions are provided:
Figure 410933DEST_PATH_IMAGE010
average thickness ofhThe top plate of (a) is provided,
Figure 592515DEST_PATH_IMAGE011
substituting for the yield limit of the roof strata to obtain:
Figure 516609DEST_PATH_IMAGE013
a、bin the known manner, it is known that,q、tunknown, the above formula is the load under the plastic limit stateqRepresentative value of twisted wiretThe corresponding relationship of (2).
tByqTaking the minimum to obtain:
Figure 416432DEST_PATH_IMAGE033
；
taking a positive value:
Figure 716963DEST_PATH_IMAGE015
substituting the solution to obtain:
Figure 753052DEST_PATH_IMAGE016
；
the upper formula is the corresponding relation between the lower limit load of the plastic limit state and the size, physical property and mechanical property of the top plate, the upper load of the top plate is known in the underground coal mine, and the plate length is increased along with the advance of the working surfacebWhen the critical value is reached, the top plate enters a plastic limit state, and the corresponding relation in the formula is met.
S5, calculating the initial pressure step:
order to
Figure 113627DEST_PATH_IMAGE034
And calculating and sorting to obtain:
Figure 371519DEST_PATH_IMAGE018
the length of the plate is long along with the advance of the working face under the coal minebWhen the critical value is reached, the top plate enters a plastic limit state, and the load on the top plate is taken as the limit load, namelyq=q Pole(s) The physical and mechanical properties of the roof strata are known as the sum of the overburden load on the roof, the length of the working face and the width of the two crossroadsAverage thickness of the top platehThe length of the plate can be calculated by the above formulabValue of (2), plate lengthbNamely the initial pressure step.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement, component separation or combination and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (1)

1. A coal mine roof initial pressure step pitch prediction method based on a virtual work theory is characterized by comprising the following steps of:
s1, determining the length of a working face, the width of a transportation gateway and a return air gateway, the average thickness of a top plate and the mechanical characteristics of top plate rocks according to the actual condition of the working face, wherein the top plate reaches a plastic limit state along with the propulsion of the working face in an underground coal mine, and a plastic hinge line in a four-slope top form appears;
s2, calculating the virtual work done by the external force:
virtual work done by external forceWVolume and load of "four-pitched roof" obtained by the cut-and-fill methodqThe product of (a) yields:
Figure 874743DEST_PATH_IMAGE001
wherein the content of the first and second substances,
Figure 765339DEST_PATH_IMAGE002
equal to the volume of the destructive mechanism in the virtual displacement mode;
substituting each parameter to obtain:
Figure 296814DEST_PATH_IMAGE003
；
in the formula (I), the compound is shown in the specification,
W: the virtual work done by the external force is provided,
δ: the flexibility of the center of the top plate,
a: the sum of the length of the working face and the width of the two gate grooves,
b: the step pitch is pressed for the first time,
q: covering a load on the top plate;
s3, calculating total internal force virtual dissipation energy:
the total internal force virtual dissipation energy is the work of the top of the four-slope top and the extreme bending moment at the plastic hinge line of the plate frame on the relative corner, and the total internal force virtual dissipation energyTThe calculation formula of (c) is:
Figure 640071DEST_PATH_IMAGE004
s4, obtaining the corresponding relation between the ultimate load and the plate size in the plastic limit state, and the physical and mechanical properties according to the condition that the virtual work done by the external force is equal to the total virtual dissipation of the internal force;
order toW=TTo get solved
Figure 813563DEST_PATH_IMAGE005
，
Has an average thickness ofhThe top plate of (a) is provided,
Figure 558665DEST_PATH_IMAGE006
，
Figure 385676DEST_PATH_IMAGE007
is obtained by substituting the yield limit of the roof strata
Figure 481808DEST_PATH_IMAGE008
；
The upper formula is the load under the plastic limit stateqRepresentative value of twisted wiretThe corresponding relationship of (a) to (b),tbyqTaking the minimum to obtain:
Figure 927833DEST_PATH_IMAGE009
，
taking a positive value:
Figure 793021DEST_PATH_IMAGE010
substitution to obtain
Figure 666299DEST_PATH_IMAGE011
；
In the formula (I), the compound is shown in the specification,
Figure 984148DEST_PATH_IMAGE012
the limit load is the limit load in the plastic limit state;
s5, calculating the step pitch of the first pressure:
the length of the plate is long along with the advance of the working face under the coal minebWhen the critical value is reached, the top plate enters a plastic limit state, and the load on the top plate is taken as the limit load, namelyq=q Pole(s) The load on the top plate, the sum of the length of the working surface and the width of the two crossroads, the physical and mechanical properties of the rock stratum of the top plate and the average thickness of the top plate are knownhThe length of the plate can be calculated by the following formulabValue of (2), plate lengthbNamely the initial pressure step distance, the calculation formula is as follows:
Figure 233863DEST_PATH_IMAGE013
wherein the content of the first and second substances,
Figure 78191DEST_PATH_IMAGE014
，hthe average thickness of the top plate is,qan overburden is applied to the roof.
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CN106285782A (en) * 2016-08-30 2017-01-04 中国矿业大学(北京) Bump method for early warning under a kind of complicated geological Environmental effect and system
CN111305847A (en) * 2019-12-06 2020-06-19 中国人民解放军军事科学院国防工程研究院工程防护研究所 Dynamic ultimate strength control method for ultra-shallow-buried underground excavation construction of urban underground engineering

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CN106285782A (en) * 2016-08-30 2017-01-04 中国矿业大学(北京) Bump method for early warning under a kind of complicated geological Environmental effect and system
CN111305847A (en) * 2019-12-06 2020-06-19 中国人民解放军军事科学院国防工程研究院工程防护研究所 Dynamic ultimate strength control method for ultra-shallow-buried underground excavation construction of urban underground engineering

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