Comprehensive Evaluation Method and Design Method for Underground Engineering Support System

Abstract

The present invention relates to the technical field of underground chamber support, and the technical problem to be solved is: how to reduce the deviation between the parameter design of the support system and the actual stress condition. The present invention discloses a comprehensive evaluation method and a design method for an underground engineering support system. The evaluation method includes: respectively performing dynamic and static coupling tests on anchoring members of various models to obtain the optimal anchoring members; assembling a plurality of the optimal anchoring members with a plurality of support members of different specifications into a plurality of support systems, and respectively performing dynamic and static coupling tests on the plurality of support systems to obtain the optimal support members; assembling at least two of the optimal anchoring members and the optimal support members into an optimal support system. The comprehensive evaluation method for an underground engineering support system of the present invention is applicable to the testing and design of underground engineering support parameters, and provides a basis for the comprehensive testing of the dynamic and static coupling mechanical properties and parameter design of the underground engineering support system.

Description

Technical Field

[0001] The present invention relates to the technical field of underground chamber support, and particularly to a comprehensive evaluation method and a design method for an underground engineering support system. Background Art

[0002] During the underground coal mining process, the roadway generally adopts a support system composed of anchoring members (the anchoring members are divided into two types: anchor bolts and anchor cables) and support members (the support members include support nets, support crossbeams and support columns). With the increase of the mining depth of the mine, the roadway faces more and more deep geological complex conditions such as high ground stress, strong mining disturbance, fault fracture zones, etc., which puts higher requirements on the support capacity of the roadway support system. At the same time, the support system is jointly affected by static load and dynamic load, and complex stresses will be formed in the support material. Therefore, the effective testing of the performance of the support material and the reasonable design of the parameters are the effective guarantees for the safe and stable control of the roadway under complex conditions.

[0003] The existing methods for testing the performance and designing the parameters of the support system have the following problems:

[0004] At present, the indoor mechanical property tests of the support material are mostly carried out under static loading and dynamic loading conditions, and it is impossible to effectively simulate the static-dynamic coupling stress situation of the on-site support material, resulting in a deviation between the parameter design of the support system and the actual stress situation. Summary of the Invention

[0005] The purpose of the present invention is to provide a comprehensive evaluation method and a design method for an underground engineering support system, and its advantages are: by adopting static-dynamic coupling loading to test the anchoring members and the support system, the static-dynamic coupling stress situation of the on-site support material is effectively simulated, thereby reducing the deviation between the parameter design of the support system and the actual stress situation, and having guiding value for the parameter design of the on-site support material.

[0006] A comprehensive evaluation method for an underground engineering support system of the present invention includes: respectively performing static-dynamic coupling tests on each type of anchoring member to obtain the optimal anchoring member; assembling multiple optimal anchoring members with multiple support members of different specifications into multiple support systems, respectively performing static-dynamic coupling tests on the multiple support systems to obtain the optimal support member; assembling at least two optimal anchoring members and the optimal support member into the optimal support system; installing the optimal support system in a simulated support site for testing, and optimizing through monitoring feedback.

[0007] Preferably or optionally, it further includes setting the row spacing between the optimal anchoring members of multiple optimal support systems to be different, respectively performing static-dynamic coupling tests to obtain the optimal support system with the optimal row spacing of the anchoring members, and installing it in a simulated support site for testing, and optimizing through monitoring feedback.

[0008] Preferably or optionally, the dynamic and static coupling tests for obtaining the optimal support members include the dynamic and static coupling tests for the optimal support net, the dynamic and static coupling tests for the optimal support crossbeam, and the dynamic and static coupling tests for the optimal support column.

[0009] Preferably or optionally, the dynamic and static coupling tests for obtaining the optimal support net include the tests for obtaining the model of the optimal support net.

[0010] Preferably or optionally, the dynamic and static coupling tests for the optimal support net further include the tests for obtaining the area of the optimal support net.

[0011] Preferably or optionally, the dynamic and static coupling tests for the optimal support net further include the tests for obtaining the number of layers of the optimal support net.

[0012] Preferably or optionally, the dynamic and static coupling tests for the optimal support crossbeam include the tests for obtaining the model of the optimal support crossbeam.

[0013] Preferably or optionally, the dynamic and static coupling tests for the optimal support column include the tests for obtaining the model of the optimal column.

[0014] Preferably or optionally, the dynamic and static coupling tests include the dynamic and static coupling tensile test, the dynamic and static coupling shear test, and the dynamic and static coupling torsional shear test.

[0015] The present invention also provides a design method for an underground engineering support system, which uses the optimal test parameters obtained by the above-mentioned comprehensive evaluation method for the underground engineering support system.

[0016] The advantages of the comprehensive evaluation method and design method for an underground engineering support system of the present invention compared with the prior art are as follows: Since the dynamic and static coupling loading tests are used for the anchoring members and the support system, the core parameters of the support system design include the model of the anchoring member, the pre-tightening force of the anchoring member, the row and spacing of the anchoring members, the model of the support net, the area of the support net, the number of layers of the support net, the model of the support crossbeam, and the model of the support column; the designed support parameters are applied on-site and optimized through monitoring feedback. This method is applicable to the testing and design of underground engineering support parameters, and can provide a basis for the comprehensive dynamic and static coupling mechanical property testing and parameter design of the underground engineering support system. Description of the Drawings

[0017] Figure 1 It is a flowchart of a comprehensive evaluation method for an underground engineering support system of the present invention.

[0018] Figure 2 It is a schematic diagram of the dynamic and static coupling tensile test state of the anchoring member in a comprehensive evaluation method for an underground engineering support system of the present invention.

[0019] Figure 3 It is a schematic diagram of the dynamic and static coupling tensile-shear test state of the anchoring member in a comprehensive evaluation method for an underground engineering support system of the present invention.

[0020] Figure 4 It is a schematic diagram of the dynamic and static coupling test state of a support system of a comprehensive evaluation method for an underground engineering support system of the present invention.

[0021] Description of Figure Number

[0022] 1. Anchoring member; 2. Drop hammer; 3. Hollow cylinder; 4. Bracket; 5. Pallet; 6. Rotating device; 7. Tensile device; 8. Support system. DETAILED DESCRIPTION

[0023] The following is combined with the attached drawings Figures 1 to 4 A comprehensive evaluation method for an underground engineering support system of the present invention is further described in detail. The anchoring components described below are anchor rods or anchor cables, and those skilled in the art can select the type of anchoring components according to actual needs.

[0024] A comprehensive evaluation method for an underground engineering support system of the present invention comprises:

[0025] The anchor components of each type are subjected to dynamic-static coupling tests to obtain the optimal anchor components. Preferably, the anchor components of each type are subjected to dynamic-static coupling tensile tests, dynamic-static coupling shear tests, and dynamic-static coupling torsion shear tests.

[0026] The dynamic and static coupling tests were carried out on the anchor components of each type, and the tensile breaking force of the anchor components was obtained as F MG-T-I , the shear force of the anchor member is F MG-S-II ; The tensile breaking force F MG-T-I and shear force F MG-S-II Substitute (αF MG-T-I +βF MG-S-II )max calculation formula, where α+β=1, α and β are proportional coefficients, and the corresponding optimal anchor component model T is calculated. MG , Anchor member pre-tightening torque M MG .

[0027] Multiple optimal anchoring components are assembled with multiple supporting components of different specifications into multiple supporting systems, and dynamic and static coupling tests are performed on the multiple supporting systems to obtain the optimal supporting components. Among them, the supporting components include supporting nets, supporting beams, and supporting columns. For example, the supporting beams include two top beams and two bottom beams, and each beam is provided with multiple through holes for installing anchoring components.

[0028] For example, dynamic and static coupled tensile tests are performed on multiple support systems.

[0029] For example, dynamic and static coupled shear tests are performed on multiple support systems.

[0030] For example, dynamic-static coupling torsional shear tests are respectively carried out on multiple support systems.

[0031] For example, dynamic-static coupling tensile tests, dynamic-static coupling shear tests, and dynamic-static coupling torsional shear tests are respectively carried out on multiple support systems.

[0032] At least two optimal anchoring members and optimal support members are assembled into the optimal support system 8.

[0033] The optimal support system 8 is installed at the simulated support site for testing and optimized through monitoring feedback.

[0034] As Figure 2 and Figure 3 shown, the above-mentioned dynamic-static coupling test is carried out through a dynamic-static coupling test device.

[0035] As Figure 2 shown, when a dynamic-static coupling tensile loading test needs to be carried out on the anchoring member 1, the anchoring member 1 is passed through the through-hole of the drop hammer 2 and the cavity of the hollow oil cylinder 3, and the upper end of the anchoring member 1 is suspended and installed at the upper end of the bracket 4, the lower end of the anchoring member 1 is installed with a tray 5, the hollow oil cylinder 3 applies a static force to the tray 5, the lower end of the drop hammer 2 passes through the hollow oil cylinder 3 to apply a dynamic force to the tray 5, the first force sensor detects the dynamic force of the drop hammer 2, the second force sensor detects the static force of the hollow oil cylinder 3, and the data acquisition device respectively records the data of the dynamic force and the static force.

[0036] When a dynamic-static coupling shear loading test needs to be carried out on the anchoring member 1, both ends of the anchoring member 1 are respectively fixed on the first fixture of the rotating device 6 and the second fixture of the tensile device 7, the hollow oil cylinder 3 applies a vertical static force to the anchoring member 1, the drop hammer 2 applies a dynamic force to the anchoring member 1, the first force sensor detects the dynamic force of the drop hammer 2, the second force sensor detects the static force of the hollow oil cylinder 3, and the data acquisition device respectively records the data of the dynamic force and the static force.

[0037] When a dynamic-static coupling torsional shear loading test needs to be carried out on the anchoring member 1, the rotating device 6 applies a torsional force to the first fixture and the anchoring member 1, the hollow oil cylinder 3 applies a vertical static force to the anchoring member 1, the drop hammer 2 applies a dynamic force to the anchoring member 1, the first force sensor detects the dynamic force of the drop hammer 2, the second force sensor detects the static force of the hollow oil cylinder 3, the torque sensor 24 detects the torque of the rotating device 6, and the data acquisition device respectively records the data of the dynamic force, the static force, and the torque.

[0038] When a static-dynamic coupling tensile-shear loading test needs to be carried out on the anchoring member 1, the tensile device 7 applies a tensile force to the first fixture and the anchoring member 1, the hollow oil cylinder 3 applies a vertical static force to the anchoring member 1, the drop hammer 2 applies a dynamic force to the anchoring member 1, the first force sensor detects the dynamic force of the drop hammer 2, the second force sensor detects the static force of the hollow oil cylinder 3, the third force sensor detects the torque of the tensile device 7, and the data acquisition device records the data of the dynamic force, static force and tensile force respectively.

[0039] As Figure 4 shown, when a static-dynamic coupling loading needs to be carried out on the support system 8, the support system 8 is installed at the lower part of the hollow oil cylinder 3, and the static-dynamic coupling loading test is carried out on the test part of the support system 8 with reference to the above test method.

[0040] In a comprehensive evaluation method for an underground engineering support system of the present invention, since the static-dynamic coupling loading test is adopted for the anchoring member and the support system, the situation of the static-dynamic coupling force of the on-site support material is effectively simulated, so that the deviation between the parameter design of the support system and the actual force situation is reduced, which has guiding value for the parameter design of the on-site support material.

[0041] A comprehensive evaluation method for an underground engineering support system of the present invention may further be based on the foregoing technical solutions: the row spacing between the optimal anchoring members of multiple optimal support systems is set to be different, and the static-dynamic coupling tests are respectively carried out to obtain the optimal support system with the optimal anchoring member row spacing, and it is installed in the simulated support site for testing and optimized through monitoring feedback.

[0042] A comprehensive evaluation method for an underground engineering support system of the present invention may further be based on the foregoing technical solutions: the static-dynamic coupling test for obtaining the optimal support member includes the static-dynamic coupling test for the optimal support net, the static-dynamic coupling test for the optimal support cross beam and the static-dynamic coupling test for the optimal support column.

[0043] A comprehensive evaluation method for an underground engineering support system of the present invention may further be based on the foregoing technical solutions: the static-dynamic coupling test for obtaining the optimal support net includes the test for obtaining the optimal support net model. For example, the support net models on multiple support systems 8 are different, and the static-dynamic coupling loading tests are respectively carried out on multiple support systems 8 to obtain the optimal support net model.

[0044] The optimal support net model is installed on the support system 8 to form the optimal support system.

[0045] A comprehensive evaluation method for an underground engineering support system according to the present invention may further be based on the foregoing technical solutions: The dynamic and static coupling test of the optimal support net also includes a test for obtaining the area of the optimal support net. For example, the support net areas on multiple support systems 8 with the optimal support net model are different. The dynamic and static coupling loading tests are respectively carried out on the multiple support systems 8 to obtain the support net with the optimal area.

[0046] Install the support net with the optimal model and the optimal area on the support system 8 to form an optimal support system.

[0047] A comprehensive evaluation method for an underground engineering support system according to the present invention may further be based on the foregoing technical solutions: The dynamic and static coupling test of the optimal support net also includes a test for obtaining the number of layers of the optimal support net. For example, the number of layers of the support nets on multiple support systems 8 is different, and the dynamic and static coupling loading tests are respectively carried out to obtain the support net with the optimal number of layers.

[0048] Install the support net with the optimal model, the optimal area and the optimal number of layers on the support system 8 to form an optimal support system.

[0049] A comprehensive evaluation method for an underground engineering support system according to the present invention may further be based on the foregoing technical solutions: The dynamic and static coupling test of the optimal support cross beam includes a test for obtaining the model of the optimal support cross beam. For example, the models of the support cross beams on multiple support systems 8 are different, and the dynamic and static coupling tests are respectively carried out on the multiple support systems 8 to obtain the model of the optimal support cross beam. Install the anchoring members with the optimal row spacing, the support cross beam with the optimal model, and the optimal support net on the support system 8 to form an optimal support system.

[0050] A comprehensive evaluation method for an underground engineering support system according to the present invention may further be based on the foregoing technical solutions: The dynamic and static coupling test of the optimal support column includes a test for obtaining the model of the optimal column. For example, the column models of multiple support systems 8 are different, and the dynamic and static coupling loading tests are respectively carried out to obtain the model of the optimal column. Install the column with the optimal model, the anchoring members with the optimal row spacing, the support cross beam with the optimal model, and the optimal support net on the support system 8 to form an optimal support system.

[0051] The dynamic and static coupling tests are respectively carried out on each support system to obtain the tensile force of the anchoring member as F MG-T-III , the deflection of the support net as N W-III , the force on the support cross beam as F B-III , the force on the support column as F P-III , and substitute F MG-T-III , N W-III , F B-III and F P-III into (γF MG-T-III + λN W-III + μFB-III +νF P-III Calculation formula for )min

[0052] where γ + λ + μ + ν = 1, and γ, λ, μ, ν are proportionality coefficients, and the corresponding optimal row and column spacing JP of the anchoring members is calculated MG , support mesh type T W , support mesh area S W , number of support mesh layers C W , support crossbeam type T B and support column type T P .

[0053] The present invention also provides a design method for an underground engineering support system, which uses the optimal test parameters obtained by the above-mentioned comprehensive evaluation method for the underground engineering support system. Since the optimal test parameters obtained by the above-mentioned evaluation method are adopted in a parameter design method for underground support of the present invention, the effect that the parameter design is more in line with the force of the underground project is achieved.

[0054] The above only illustrates several specific embodiments of the present invention, but it cannot be used as the protection scope of the present invention. Any equivalent changes, modifications, equal-proportion enlargements or reductions, etc. made according to the design spirit of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. An integrated evaluation method for an underground engineering support system, characterized in that Including: Conduct dynamic and static coupling tests on the anchoring components of each model to obtain the optimal anchoring components; Assemble multiple optimal anchoring components with multiple support components of different specifications into multiple support systems, conduct dynamic and static coupling tests on the multiple support systems respectively, and obtain the optimal support components; Assemble at least two optimal anchoring components and the optimal support components into the optimal support system; Install the optimal support system at the simulated support site for testing, and optimize through monitoring feedback; It also includes setting the row spacing between the optimal anchoring components of multiple optimal support systems to be different, conducting dynamic and static coupling tests respectively, obtaining the row spacing of the optimal anchoring components of the optimal support system, and installing them at the simulated support site for testing, and optimizing through monitoring feedback; The dynamic and static coupling tests for obtaining the optimal support components include the dynamic and static coupling tests of the optimal support net, the dynamic and static coupling tests of the optimal support crossbeam, and the dynamic and static coupling tests of the optimal support column; The dynamic and static coupling tests for obtaining the optimal support net include obtaining the optimal support net model test, the optimal support net area test, and the optimal support net layer number test; The dynamic and static coupling tests of the optimal support crossbeam include obtaining the test of the optimal support crossbeam model; The dynamic and static coupling tests of the optimal support column include obtaining the test of the optimal column model; Conduct dynamic-static coupling tests on each support system to obtain the tensile force of the anchoring member as F MG-T-III , the deflection N of the support net W-III , the force F on the support crossbeam B-III , the force F on the support column P-III , and substitute F MG-T-III , N W-III , F B-III and F P-III into the calculation formula of (γF MG-T-III + λN W-III + μF B-III + νF P-III ) min; where γ + λ + μ + ν = 1, and γ, λ, μ, ν are proportionality coefficients, and the corresponding optimal row and column spacing JP of the anchoring members is calculated MG , the type T of the support net W , the area S of the support net W , the number of layers C of the support net W , the type T of the support crossbeam B and the type T of the support column P .

2. The comprehensive evaluation method for the underground engineering support system according to claim 1, wherein The static and dynamic coupling tests are respectively carried out on the anchoring members of each model, and the tensile breaking force of the anchoring member is F MG-T-I , and the shear breaking force of the anchoring member is F MG-S-II ; Substitute the tensile breaking force F MG-T-I and the shear breaking force F MG-S-II into the (αF MG-T-I + βF MG-S-II ) max calculation formula, where α + β = 1, and α and β are proportionality coefficients, and calculate the corresponding optimal anchoring member model T MG and the pre-tightening torque M MG .

3. The comprehensive evaluation method for the underground engineering support system according to any one of claims 1-2, characterized in that, The dynamic and static coupling tests include dynamic and static coupling tensile tests, dynamic and static coupling shear tests, and dynamic and static coupling torsional shear tests.

4. A design method for an underground engineering support system, characterized in that, The test parameters obtained by using the comprehensive evaluation method for the underground engineering support system described in any one of claims 1-3.

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