Inclined roadway supporting method

Abstract

The invention discloses an inclined roadway supporting method, which relates to the technical field of coal mines, and comprises the following steps of: 1, collecting related data of a coal mine to be supported, and determining a supporting model parameter X; 2, searching according to the support model parameter X to obtain a support data group, and making an orthogonal table; 3, calculating to obtain a model parameter X '; the method comprises the steps of (1) obtaining model parameters X ', (2) obtaining model parameters X', (3) obtaining model parameters X ', (4) obtaining simulation material data by combining support data retrieval according to the model parameters X', (5) manufacturing a simulation material according to the simulation material data, (6) manufacturing a roadway support model and carrying out a pressurization experiment, and (7) recording data, repeating the step (6) until an orthogonal table is completed, and analyzing the orthogonal table to obtain an optimal support scheme.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mines, and particularly relates to a method for supporting an inclined roadway. BACKGROUND

[0002] In China, coal occupies a dominant position in energy sources. In 2022, the total energy consumption was 54.1 billion tons of standard coal, an increase of 2.9% over the previous year. Coal consumption increased by 4.3%, setting a new record. Roadway support is of great importance to coal safety, and it is difficult to obtain good roadway support parameters through mechanical calculation for strata with large inclination angles. How to design roadway support for inclined strata is a major problem in coal mine roadway support, and designing good support parameters is of great significance to the safety and economy of coal mine roadway support.

[0003] The existing roadway support design method mainly adjusts the design parameters based on the deformation on site, and continuously supplements the support strength, which delays the progress of the project. SUMMARY

[0004] In view of the problems mentioned in the background art, the purpose of the present application is to provide a method for supporting an inclined roadway to solve the problems mentioned in the background art.

[0005] The above technical purpose of the present application is achieved by the following technical scheme:

[0006] A method for supporting an inclined roadway, comprising the following steps:

[0007] Step 1: Collect relevant data of the coal mine to be supported, and determine support model parameters X;

[0008] Step 2: Retrieve support data sets according to the support model parameters X, and make an orthogonal table;

[0009] Step 3: Calculate the model parameters X';

[0010] Step 4: Obtain simulation material data according to the model parameters X' combined with the support data retrieval;

[0011] Step 5: Make simulation materials according to the simulation material data;

[0012] Step 6: Make a roadway support model and perform a pressure test;

[0013] Step 7: Record the data, repeat step 6 until the orthogonal table is completed, and analyze the orthogonal table to obtain the best support scheme.

[0014] Preferably, in step 1, the support model parameters X include roadway stress parameters, roadway shape parameters and roadway rock parameters.

[0015] Preferably, the roadway stress parameters include: roadway horizontal first principal stress P h1 , roadway horizontal third principal stress P h3 , roadway horizontal first principal stress direction Φ -p (zero degree with north), roadway vertical stress P v , roadway strike angle Φ -h (zero degree with north);

[0016] The roadway shape parameters include: all the rock contained in a square with side length of 6H and the center of which is the midpoint of the bottom of the roadway cross section, and the roadway shape structure S is obtained by measurement, the roadway height H, and the roadway width W;

[0017] The roadway rock parameters include: rock compressive strength P c-i , rock Poisson's ratio R i , rock elastic modulus E i , rock friction angle Φ i , rock cohesion C i , stratum layer thickness T i , stratum layer dip angle α i .

[0018] Preferably, in step two, the support model parameters X mainly include the roadway stress parameters.

[0019] Preferably, in step two, a stress database is established according to the searched roadway stress parameters and the support scheme, and the data is supplemented into the stress database after the experiment is completed.

[0020] Preferably, in step four, the similarity ratio r is selected according to the actual situation, and the model parameters X' are calculated, which include the model stress parameters corresponding to the roadway stress parameters, the rock model parameters corresponding to the roadway shape parameters, and the model shape parameters corresponding to the roadway rock parameters:

[0021] The model stress parameters include: roadway model horizontal first principal stress P h1 '= P h1 / r, roadway model horizontal third principal stress P h3 '= P h3 / r, roadway model vertical stress P v '= P v / r;

[0022] The rock model parameters include: rock model compressive strength P c-i '= P c-i / r, rock model Poisson's ratio R'=R, rock model elastic modulus E i '= E i , rock model friction angle Φ i '= Φ i , rock model cohesion Ci ’=C i / r, the model stratum layer thickness T i ’=T i / r, the model stratum layer dip angle a i = a i ;

[0023] The model shape parameters include: roadway model height H'=H / r, roadway model width W'=W / r.

[0024] Preferably, in step two, the support data includes anchor rod length, anchor cable length, anchor rod quantity, anchor cable quantity, and support material, etc., and multiple sets of support data are used to make orthogonal tables.

[0025] Preferably, in step four, the simulation material data includes required simulation materials and proportioning data.

[0026] Preferably, step six includes the following steps:

[0027] Step 601: using one set of support data to make a support model, and using model shape parameters to make a roadway model;

[0028] Step 602: pouring the rock model layer by layer according to the rock model parameters, pouring to the preset position of the roadway, placing the roadway model and the support model into the preset position of the roadway, and continuously pouring to the last layer;

[0029] Step 603: waiting for the model to be completely solidified, polishing off the excess rock material, and leaving the final roadway model;

[0030] Step 604: conducting a pressure test on the roadway support model.

[0031] Preferably, step 604 includes the following steps:

[0032] Slowly pressurize the roadway support model, while monitoring the roof displacement S1, floor displacement S2, left wall displacement S3, right wall displacement S4, horizontal first principal stress P hm1 , horizontal third principal stress P hm3 , and vertical stress P vm ;

[0033] Make the horizontal first principal stress P hm1 =P h1 ', the horizontal third principal stress P hm3 =P h3 ', and the vertical stress P vm =P v ';

[0034] After reaching the target stress, wait for the deformation of the surrounding rock of the roadway to stop.

[0035] The application designs a kind of inclined roadway support method, by making roadway support model, not direct support, effectively reduce cost, applicable to a variety of roadway support design, try to with safe and economic way for engineering build the most suitable support system;Based on similarity theory, statistics and computer technology, implementation is simple, design method is widely applicable, has strong popularization, and good economy.

[0036] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 Flowchart of a kind of inclined roadway support method proposed in the application Figure One ;

[0038] Figure 2 Flowchart of a kind of inclined roadway support method proposed in the application Figure Two . DETAILED DESCRIPTION

[0039] Embodiments of the application are described in detail below, examples of which are shown in the drawings, wherein the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the application, and cannot be understood as limiting the application.

[0040] Example 1

[0041] Reference Figures 1-2 , the inclined roadway support method described in this embodiment includes

[0042] Step 10: Establish a database;

[0043] Step 101: Establish a stress database;

[0044] Search a large amount of existing data, establish a classification model database of support schemes corresponding to different ground stresses, including anchor rod length, anchor cable length, anchor rod quantity and anchor cable quantity and other data. And establish the ground stress intensity formula M=[(P i1 - P i3 ) / 2]x tan (Φ -p -Φ -h )x δ1+ P i1 x δ2+ P l x δ 3。

[0045] Where δ1+δ2+δ3=1, P i1 and P i3These are the first and third principal horizontal stresses of the roadway, respectively, Φ -p Φ is the direction of the first principal stress in the roadway. -h P represents the angle of the tunnel's direction. l The vertical stress of the support model.

[0046] It is worth noting that this step is not mandatory; multiple support schemes can be obtained by searching for similar data based on the actual tunnel data.

[0047] Step 102: Establish the model database;

[0048] We searched through a large amount of existing data to establish a model database of simulation materials corresponding to rock model parameters, so as to facilitate the selection of appropriate simulation materials based on rock parameters.

[0049] It is worth noting that this step is not mandatory; you can simply retrieve the corresponding simulation material based on similar data using the rock model parameters.

[0050] Step 20: Collect relevant data on the coal mine to be supported and determine the support model parameter X;

[0051] Collect relevant data of the coal mine to be supported by measurement or table lookup, and determine the support model parameters X, which include roadway stress parameters, roadway shape parameters and roadway rock parameters;

[0052] Tunnel stress parameters include:

[0053] The first principal stress P in the tunnel horizontal direction h1 ,

[0054] The third principal stress P in the tunnel horizontal direction h3 ,

[0055] The direction of the first principal stress in the roadway is Φ. -p (with true north as zero degrees)

[0056] Vertical stress P in the tunnel v ,

[0057] Lane direction angle Φ -h (With true north as zero degrees);

[0058] The tunnel shape parameters include:

[0059] Select all rocks contained within a square with a side length of 6H centered at the midpoint of the bottom of the tunnel cross-section, and measure the tunnel shape structure S, tunnel height H, and tunnel width W.

[0060] The rock parameters of the tunnel include:

[0061] The rock compressive strength P was obtained by observation. c-i ,

[0062] Rock Poisson's ratio R i ,

[0063] Rock elastic modulus E i ,

[0064] Rock friction angle Φ i ,

[0065] Rock cohesion C i ,

[0066] Strata layer thickness T i ,

[0067] Strata layer dip angle α i .

[0068] Step 30: search the stress database and make orthogonal table;

[0069] Substitute the support model parameter X into the ground stress intensity formula M, specifically, P i1 =P h1 , P i3 =P h3 , P l =P v ;

[0070] Get the appropriate ground stress intensity formula M=[(P h1 -P h3 ) / 2]x tan(Φ -p -Φ -h )x δ1+ P i1 x δ2+ P l x δ3.

[0071] According to the ground stress intensity formula M, search the stress database to get the parameter range of the anchor rod length, anchor cable length, anchor rod number, anchor cable number and support material within a certain range, and make an orthogonal table according to the parameter range.

[0072] Step 40: calculate the model parameter X';

[0073] Select the similarity ratio r to calculate the model parameter X', which includes model stress parameter + rock model parameter + model shape parameter:

[0074] The model stress parameter includes:

[0075] The first principal stress P h1 ' of the roadway model in the horizontal direction = P h1 / r,

[0076] The third principal stress P h3 ' of the roadway model in the horizontal direction = P h3 / r,

[0077] Vertical stress of roadway model P v ’ = P v / r;

[0078] The rock model parameters include:

[0079] Compressive strength of rock model P c-i ’ = P c-i / r,

[0080] Poisson's ratio of rock model R’ = R,

[0081] Elastic modulus of rock model E i ’ = E i ,

[0082] Friction angle of rock model Φ i ’ = Φ i ,

[0083] Cohesion of rock model C i ’ = C i / r,

[0084] Layer thickness of model stratum T i ’ = T i / r,

[0085] Layer dip angle of model stratum α i = α i ;

[0086] The model shape parameters include:

[0087] Height of roadway model H’ = H / r,

[0088] Width of roadway model W’ = W / r.

[0089] Step 50: search the model database to obtain model simulation materials;

[0090] According to the reduced rock model parameters and support material parameters, search the model database to obtain the simulation materials and proportioning data required for the roadway model experiment, and according to the proportioning, start from the bottom to the last layer to make simulation materials.

[0091] Step 60: make a roadway support model and perform a pressure experiment;

[0092] Step 601: use one set of support data to make a support model, and make a roadway module according to the model shape parameters;

[0093] Step 602: pour the rock model layer by layer in the pouring pool according to the rock model parameters, and pour to the preset position of the roadway, put the roadway module and the support model into the pouring pool, and continue to pour to the last layer;

[0094] Step 603: Wait for the model to be completely solidified, polish off the excess rock material, and leave the final roadway model;

[0095] Step 604: Perform a pressure test on the roadway support model;

[0096] Slowly pressurize the roadway support model while monitoring the roadway roof displacement S1, floor displacement S2, left wall displacement S3, right wall displacement S4, horizontal first principal stress P hm1 , horizontal third principal stress P hm3 , and vertical stress P vm ;

[0097] Set the horizontal first principal stress P hm1 =P h1 ', the horizontal third principal stress P hm3 =P h3 ', and the vertical stress P vm =P v ';

[0098] Wait for the roadway surrounding rock deformation to stop after reaching the target stress;

[0099] Step 70: Record the data, repeat step 60 until the orthogonal table is completed, and analyze the orthogonal table to obtain the best support scheme.

[0100] Finally, the obtained support scheme is used as the construction parameter to complete the on-site construction and monitoring, and the final deformation result is returned to the expanded classification database.

[0101] The support design method comprehensively considers different geological conditions and roadway cross-section conditions, is suitable for various roadway support design, and tries to build the most suitable support system in a safe and economical way; based on the similarity theory, statistics and computer technology, the implementation is simple, the design method is widely applicable, has strong popularization, and is economical.

[0102] It should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0103] In addition, the terms "first", "second", etc. are used only to describe the purpose and should not be understood as indicating or implying relative importance or implying a number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0104] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0105] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0106] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of incline tunnel support, characterised by: The method comprises the following steps: Step one: collect the relevant data of the coal mine to be supported, and determine the support model parameter X; Step two: retrieve the support data set according to the support model parameter X, and make an orthogonal table; Step three: calculate the model parameter X'; Step four: obtain the simulation material data according to the model parameter X' combined with the support data retrieval; Step five: make simulation materials according to the simulation material data; Step six: make a roadway support model and conduct a pressure test; Step seven: record the data, repeat step six until the orthogonal table is completed, and analyze the orthogonal table to obtain the best support scheme.

2. The inclined drift lining method according to claim 1, characterized in that: In step one, the support model parameter X includes the roadway stress parameter, the roadway shape parameter, and the roadway rock parameter.

3. A method of inclined drift lining according to claim 2, characterised in that: The roadway stress parameters include: roadway horizontal first principal stress P h1 , roadway horizontal third principal stress P h3 , roadway horizontal first principal stress direction Φ -p (taking north as zero degree), roadway vertical stress P v , and roadway strike angle Φ -h (taking north as zero degree). The roadway shape parameter includes: selecting all the rocks contained in a square with a side length of 6H and taking the midpoint of the bottom section of the roadway as the center, measuring to obtain the roadway shape structure S, the roadway height H, and the roadway width W; The roadway rock parameters include: observed rock compressive strength P c-i , rock Poisson's ratio R i , rock elastic modulus E i , rock friction angle Φ i , rock cohesion C i , stratigraphic layer thickness T i , stratigraphic layer dip angle α i .

4. A method of inclined drift lining according to claim 3, characterised in that: In step two, the support model parameter X mainly includes the roadway stress parameter.

5. A method of inclined drift lining according to claim 4, characterised in that: In step two, a stress database is established according to the retrieved roadway stress parameter and support scheme, and after the experiment is completed, the data is supplemented into the stress database.

6. The method of inclined drift support according to claim 3, characterised by: In step four, the similar ratio r is selected according to the actual situation, and the model parameter X' is calculated, including the model stress parameter corresponding to the roadway stress parameter, the rock model parameter corresponding to the roadway shape parameter, and the model shape parameter corresponding to the roadway rock parameter: The model stress parameters include: a first principal stress P h1 ’= P h1 / r in the roadway model, a third principal stress P h3 ’= P h3 / r in the roadway model, and a vertical stress P v ’= P v / r. Rock model parameters include: rock model compressive strength P c-i ’ = P c-i / r, rock model Poisson's ratio R’ = R, rock model elastic modulus E i ’ = E i , rock model friction angle Φ i ’ = Φ i , rock model cohesion C i ’ = C i / r, model formation layer thickness T i ’ = T i / r, model formation layer inclination angle α i = α i ; The model shape parameter includes: the roadway model height H'=H / r, and the roadway model width W'=W / r.

7. The method of inclined drift support according to claim 1, characterized by: In step two, the support data includes the anchor rod length, the anchor cable length, the anchor rod quantity, the anchor cable quantity, and the support material, and multiple sets of support data are used to make an orthogonal table.

8. The inclined drift lining method according to claim 1, characterized in that: In step four, the simulation material data includes the required simulation materials and the proportioning data.

9. The method of inclined drift support of claim 1, wherein: Step six comprises the following steps: Step 601: use one set of support data to make a support model, and make a roadway module according to the model shape parameter; Step 602: pour the rock model layer by layer according to the rock model parameter, pour to the preset position of the roadway, place the roadway module and the support model in the preset position of the roadway, and continue to pour to the last layer; Step 603: wait for the model to solidify, polish off the excess rock material, and leave the final roadway model; Step 604: conduct a pressure test on the roadway support model.

10. A method of inclined drift lining according to claim 9, characterised in that: Step 604 comprises the following steps: The roadway support model is slowly pressurized, while monitoring the roadway roof displacement S1, floor displacement S2, left wall displacement S3, right wall displacement S4, horizontal first principal stress P hm1 , horizontal third principal stress P hm3 , and vertical stress P vm ; P = P hm1 = P h1 ’; P = P hm3 = P h3 ’; P = P vm = P v ’; After reaching the target stress, wait for the deformation of the surrounding rock of the roadway to stop.

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