WO2019223389A1 - Tunnel surrounding rock support strength test apparatus and strength determination method - Google Patents

Tunnel surrounding rock support strength test apparatus and strength determination method Download PDF

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Publication number
WO2019223389A1
WO2019223389A1 PCT/CN2019/076522 CN2019076522W WO2019223389A1 WO 2019223389 A1 WO2019223389 A1 WO 2019223389A1 CN 2019076522 W CN2019076522 W CN 2019076522W WO 2019223389 A1 WO2019223389 A1 WO 2019223389A1
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WIPO (PCT)
Prior art keywords
loading
pressure
test piece
test
surrounding rock
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PCT/CN2019/076522
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French (fr)
Chinese (zh)
Inventor
刘学生
宋世琳
谭云亮
顾清恒
范德源
宁建国
江宁
王俊
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山东科技大学
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Priority to CN201811580182.9A priority Critical patent/CN109490086A/en
Priority to CN201811580182.9 priority
Application filed by 山东科技大学 filed Critical 山东科技大学
Publication of WO2019223389A1 publication Critical patent/WO2019223389A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/30Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G01N3/307Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0026Combination of several types of applied forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means

Abstract

A tunnel surrounding rock support strength test apparatus and a strength determination method, the test apparatus comprising: a bearing frame unit (1), comprising a base (11), vertical columns (12) and a horizontal beam (13), the vertical columns (12) being vertically arranged at two sides of an upper surface of the base (11), the horizontal beam (13) being horizontally fixed at upper portions of the vertical columns (12); an axial pressure loading unit (2), fixed at a middle position of the upper surface of the base (11), and used for applying vertical axial pressure to a test piece (8); an impact loading unit (3), fixed on the horizontal beam (13), and used for applying a vertical axial impact load to the test piece (8); a confining pressure loading unit (4), arranged between the axial pressure loading unit (2) and the impact loading unit (3), and used for applying horizontal confining pressure to the test piece (8). The test apparatus also comprises a loading control unit (5), a monitoring unit (6) and a data analysis unit (7). Tunnel surrounding rock actual static load stress size and dynamic load impact characteristics are used for loading stresses, so as to be better matched with on-site tunnel surrounding rock actual stress states. Obtained support strengths can better ensure surrounding rock safety and stability, the accuracy is high, and the test operations are simple and convenient.

Description

Test device and method for determining strength of surrounding rock support of roadway Technical field

The invention relates to the technical field of surrounding rock support of a roadway, in particular to a testing device for strength of a surrounding rock of a roadway and a method for determining strength.

Background technique

China's coal mines are mainly underground mining. A large number of roadways need to be dug underground. The use of roadway support to keep the roadway open and the stability of surrounding rocks is of great significance to the construction and production of coal mines. Roadway support can reduce the movement of surrounding rocks, prevent the section of the roadway from being excessively reduced, and prevent the scattered and damaged surrounding rocks from falling. The effect of roadway support is not only determined by the nature of the support itself, but also by a series of factors such as the nature of the surrounding rock and the way of contact between the support and the surrounding rock.

The design of roadway support strength is an important parameter in the design of roadway support. It is of great significance to give full play to the superiority of roadway support measures and ensure the safety of roadway. If the support strength is too high, it will waste support materials, increase support costs, and affect the progress of excavation; if the support strength is not enough, the surrounding rock deformation cannot be effectively controlled, and disasters such as gangs and roofs will occur. Selecting the proper support strength of the roadway can maintain the integrity of the surrounding rock of the roadway, effectively control the deformation of the surrounding rock, and avoid the failure of the supporting means due to the loosening or impact damage of the surrounding rock.

At present, engineering analogy and theoretical calculation methods are mostly used to determine the support strength of roadways. The engineering analogy method is based on the existing roadway project, and the support strength parameters of the new project are proposed by analogy. This method mainly relies on the existing successful experience to design. Because the actual conditions of the roadway are different, the support obtained by this method is different. The intensity is not optimal. The theoretical calculation method is based on some supporting theories, such as suspension theory, composite beam theory and reinforced arch theory. The supporting parameters are calculated to determine the supporting strength. Because the existing support theories often have certain limitations and conditions of use, and it is difficult to accurately and reliably determine some parameters required for calculation. Therefore, the design results based on theoretical calculations can only be used as a reference in many cases.

In particular, during deep coal mining, the dynamic load generated by rock formation fractures and fault collapses increased significantly, and the surrounding rock of the roadway is actually in a complex dynamic and static combined stress environment, which causes frequent failure and instability during its service, which makes it difficult to support and control. . At present, there is no suitable theory for calculation of support strength. The engineering analogy method often performs excessive support, and there is no reliable method to obtain the support strength of surrounding rock under the combined dynamic and static stress environment. The existing technology needs to be further breakthrough.

Summary of the Invention

The invention mainly solves the technical problems existing in the prior art, thereby providing a simple operation and high accuracy test device for supporting strength of surrounding rock of a roadway.

The invention also provides a method for determining the support strength by using the test device.

The above technical problems of the present invention are mainly solved by the following technical solutions:

The test device for supporting strength of roadway surrounding rock provided by the present invention includes:

The load-bearing frame unit includes a base, an upright and a cross beam, the uprights are vertically arranged on both sides of the upper surface of the base, and the crossbeam is horizontally fixed at the upper part of the upright;

An axial pressure loading unit, which is fixed at an intermediate position on the upper surface of the base and is used to apply a bottom-up axial pressure to the test piece;

An impact loading unit, which is fixed on the beam and is used to apply a top-down axial impact load to the test piece;

A confining pressure loading unit, which is arranged between the axial pressure loading unit and the impact loading unit, and includes a lateral confining pressure loading unit and a longitudinal confining pressure loading unit for applying a confining pressure in a horizontal plane to the test piece;

A loading control unit, configured to control the axial pressure loading unit, the impact loading unit, and the confining pressure loading unit to perform loading respectively;

A monitoring unit, configured to monitor the force of the test piece during the loading process;

A data analysis unit is connected to the loading control unit, and the data analysis unit is configured to receive data from the monitoring unit and process analysis.

Further, the axial pressure loading unit includes an axial pressure loading oil cylinder, an axial pressure loading oil tank, and a lower pressure head. The axial pressure loading oil cylinder is fixed on the base, and the axial pressure loading oil tank and the axial pressure loading oil cylinder. Are connected, one end of the lower pressure head is connected to the axial pressure loading cylinder, and the other end thereof vertically extends into the confining pressure loading unit and is in contact with the lower surface of the test piece.

Further, the axial pressure-loading cylinder includes an axial pressure-loading cylinder, an axial pressure-loading piston, and an axial pressure-loading piston rod. An oil inlet cavity is provided inside the axial pressure-loading cylinder, and the axial pressure-loading piston is slidably connected. In the axial pressure-loading cylinder, one end of the axial pressure-loading piston rod extends through the axial pressure-loading piston into the oil inlet cavity, and the other end of the axial pressure-loading piston rod is connected to the One end of the lower pressure head is connected, wherein an end of one end of the axial pressure loading piston rod is a curved surface.

Further, the impact-loading unit includes an impact-loading cylinder, an impact-loading tank, an upper indenter, and a pressure-bearing column, the impact-loading cylinder is fixedly connected to the beam, and the impact-loading cylinder is in phase relationship with the impact-loading tank. One end of the pressure bearing column is connected to the piston rod of the impact-loading cylinder, and the other end is connected to the top of the upper pressure head, and the bottom of the upper pressure head is connected to the upper surface of the test piece. Phase contact.

Further, the confining pressure loading unit includes a pressure chamber, two confining pressure loading oil cylinders, a confining pressure loading fuel tank, two first lateral pressure heads and two second lateral pressure heads, and the test piece is disposed at the In the pressure chamber, the confining pressure loading tank is connected to the two confining pressure loading cylinders, and a piston rod of the confining pressure loading cylinder is connected to the first lateral pressure head, and the two first The lateral indenters are respectively arranged outside the two adjacent sides of the pressure chamber, and the two first lateral indenters are horizontally extended into the pressure chamber and contact the two adjacent side walls of the test piece. A groove is respectively provided on two side walls of the pressure chamber opposite to the first lateral indenter, and a second lateral indenter and two second lateral indenters are installed in both grooves. In contact with the other two adjacent side walls of the test piece.

Further, the monitoring unit includes a pressure sensor and a signal collector connected to each other, and the pressure sensors are respectively disposed between the pressure bearing column and the upper indenter, the second lateral indenter and the Between the test pieces, the signal collector is connected to a data analysis unit.

The test method for the support strength of the surrounding rock of the roadway provided by the present invention includes the following steps:

Step 1: Use the stress relief method to measure the static stress state of the surrounding rock of the roadway;

Step 2: Use the microseismic system to obtain the dynamic load characteristics near the surrounding rock of the roadway, and infer the impact load intensity and frequency of the test;

Step 3: Take the surrounding rock of the roadway to make multiple standard test pieces;

Step 4: Loading test

Step 4.1: Place the test piece on the test machine, adjust the position of each indenter of the test machine, and apply a certain pretension force to the test piece;

Step 4.2: According to the static mechanical state of the surrounding rock of the roadway measured in step 1, the lateral confining pressure loading unit simulates the surrounding pressure of the roadway to apply a fixed X-direction pressure to the test piece, and the axial pressure loading unit applies a test piece to the test piece. Continuously increasing Z-direction (ie, axial) pressure; Y-direction support force is applied to the specimen by the longitudinal confining pressure loading unit, and the minimum Y-direction support force is set to 0;

Step 4.3: Apply the minimum Y-direction supporting force to the test piece, and perform impact loading on the test piece according to the strength and frequency of the surrounding rock impact load obtained in step 2. After the impact loading is completed, observe the damage of the test piece;

Step 4.4: Replace the test piece, keep the pressure in the X direction and the pressure in the Z direction, increase the support force in the Y direction, repeat steps 4.1-4.3 to perform a load test on the replaced test piece, and so on, and every time the test piece is replaced The support force is increased once, and each time the support force is increased, the damage of the test piece is observed after the loading test, so as to find the support force that the test piece will not be damaged, and the support strength is calculated based on the support force. The protection strength is the support strength required for the surrounding rock of the roadway.

The beneficial effect of the present invention is that rock deformation and failure tests are performed by setting different support strengths to the actual static load stress and dynamic load impact characteristics of the surrounding rock of the roadway, which take into account the effects of static load stress and dynamic load stress. The combined effect of the two is also considered, which can better match the actual stress state of the surrounding rock of the roadway on the site, and the obtained support strength can better guarantee the safety and stability of the surrounding rock, high accuracy, and simple and convenient test operation.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

1 is a schematic structural diagram of a test device for supporting strength of a surrounding rock of a roadway according to the present invention;

2 is a schematic structural diagram of a confining pressure loading unit of a surrounding rock supporting strength test device of the present invention;

FIG. 3 is a schematic structural diagram of an axial pressure loading oil cylinder of a roadway surrounding rock support strength test device according to the present invention; FIG.

FIG. 4 is the magnitude and direction of the force exerted on the test piece by the axial pressure loading unit.

In the picture:

1- load-bearing frame unit, 11-base, 12-post, 13-beam;

2-Axial pressure loading unit, 21-Axial pressure loading cylinder, 211-Axial pressure loading cylinder body, 212-Axial pressure loading piston, 213-Axial pressure loading piston rod, 214-Oil cavity, 215-arc surface, 22-shaft Pressure-loading oil tank, 23-lower indenter;

3-impact loading unit, 31-impact loading cylinder, 32-impact loading tank, 33-upper head, 34-pressure column;

4-Confining pressure loading unit, 41-Pressure chamber, 42a-Transverse confining pressure-loading cylinder, 42b-Vertical confining pressure-loading cylinder, 43-Confining pressure-loading tank, 44a-Transverse first pressure head, 44b-Vertical first pressure head 45a-first groove, 45b-second groove, 46a-transverse second indenter, 46b-longitudinal second indenter;

5- load control unit;

6-monitoring unit, 61-signal collector, 62-pressure sensor;

7-Data analysis unit;

8-Test piece.

Detailed ways

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention is more clearly defined.

Referring to Figures 1-3, a test device for supporting strength of a surrounding rock of a roadway according to the present invention includes:

The load-bearing frame unit 1 includes a base 11, a column 12, and a beam 13. The column 12 is vertically arranged on both sides of the upper surface of the base 11, and the beam 13 is horizontally fixed on the upper portion of the column 12.

The axial pressure loading unit 2 is fixed at the middle position of the upper surface of the base 11 and is used to apply a bottom-up axial pressure to the test piece 8;

The impact loading unit 3 is fixed on the beam 13 and is used to apply a top-down axial impact load to the test piece 8;

A confining pressure loading unit 4 is provided between the axial pressure loading unit 2 and the impact loading unit 3, and the confining pressure unit 4 is used to apply a confining pressure in a horizontal plane to the test piece 8;

A loading control unit 5 configured to control the axial pressure loading unit 2, the impact loading unit 3, and the confining pressure loading unit 4 respectively for loading;

A monitoring unit 6 for monitoring the force of the test piece 8 during the loading process;

The data analysis unit 7 is connected to the loading control unit 5, and the data analysis unit 7 is configured to receive data from the monitoring unit 6 and process the analysis.

Specifically, the axial-pressure loading unit 2 of the present invention includes an axial-pressure loading cylinder 21, an axial-pressure loading tank 22, and a lower pressure head 23. The axial-pressure loading cylinder 21 is fixed on the base 11. The axial pressure loading cylinder 21 is connected. One end of the lower pressure head 23 is connected to the axial pressure loading cylinder 21, and the other end thereof vertically extends into the confining pressure loading unit 4 and contacts the lower surface of the test piece 8. In the present invention, the axial pressure is applied to the test piece 8 by driving the lower pressure head 23 upward by the axial pressure loading cylinder 21.

In the embodiment of the present invention, the axial pressure-loading cylinder 21 includes an axial pressure-loading cylinder 211, an axial pressure-loading piston 212, and an axial pressure-loading piston rod 213. Inside the axial pressure-loading cylinder 211, an oil inlet cavity 214 is provided. The loading piston 212 is slidably connected in the axial pressure loading cylinder 211. One end of the axial pressure loading piston rod 213 extends through the axial pressure loading piston 212 into the oil inlet cavity 214, and the other end of the axial pressure loading piston rod 213 is pressed down. One end of the head 23 is connected, and one end of one end of the axial pressure loading piston rod 213 is an arc surface 215. In the present invention, the constant force is applied to the arc surface 215 of the piston rod 213 by axial pressure to change the constant force applied to the test piece 8 into a continuously increasing force, which truly simulates the actual force situation of the test piece 8 in the field. Make research results more accurate.

In the embodiment of the present invention, the impact-loading unit 3 includes an impact-loading cylinder 31, an impact-loading tank 32, an upper head 33, and a pressure-bearing column 34. The impact-loading cylinder 31 is fixedly connected to the beam 13 and the impact-loading cylinder 31 can pass through the oil pipe. After being connected to the impact fuel tank 32, one end of the pressure bearing column 34 is connected to the piston rod of the impact loading cylinder 31, and the other end is connected to the top of the upper pressure head 33, and the bottom of the upper pressure head 33 is connected to the test piece 8. The upper surfaces are in contact. In the present invention, an impact load can be applied to the test piece 8 by the impact loading cylinder 31.

Referring to FIG. 2, the confining pressure loading unit 4 includes a pressure chamber 41, a confining pressure loading oil tank 43, a lateral confining pressure loading cylinder 42 a, a lateral first pressure head 44 a and a lateral second pressure head 46 a, and a longitudinal confining pressure loading cylinder 42 b, The first longitudinal indenter 44b and the second longitudinal indenter 46b. The test piece 8 is arranged in the pressure chamber 41. The confining pressure loading tank 43 is connected to the lateral confining pressure loading cylinder 42a and the longitudinal confining pressure loading cylinder 42b. The piston rod of the oil cylinder 42a is connected to the first lateral indenter 44a, and the piston rod of the longitudinal confining pressure loading cylinder 42b is connected to the first longitudinal indenter 44b. The first lateral indenter 44a and the first longitudinal indenter 44b are respectively provided at The pressure chamber 41 is adjacent to the outer sides of the two sides. The first horizontal indenter 44a and the first vertical indenter 44b extend horizontally into the pressure chamber 41 and contact the two adjacent side walls of the test piece 8. The inside of the pressure chamber 41 and the horizontal first A first indenter 44a and a longitudinal first indenter 44b are respectively provided with two first and second grooves 45a and 45b on opposite side walls, and a second indenter 46a in the transverse direction is installed in the first groove 45a. A second longitudinal indenter 46b, a second transverse indenter 46a, and a second longitudinal indenter 46b are installed in the groove 45b. It is in contact with the other two adjacent side walls of the test piece 8. In the present invention, the horizontal and vertical confining pressures in the horizontal plane are applied to the test piece 8 through the mutual cooperation of the first horizontal indenter 44a and the second horizontal indenter 46a, and the first horizontal indenter 44b and the second vertical indenter 46b. Preferably, the lateral second indenter 46a and the longitudinal second indenter 46b are provided with fastening bolts on both sides, and the fastening bolts can be fixed on the grooves by the fastening bolts.

The monitoring unit 6 of the present invention includes a pressure sensor 62 and a signal collector 61 connected to each other. The pressure sensors 62 are respectively disposed between the pressure bearing column 34 and the upper indenter 33, and the second lateral indenter 46a and the test piece 8. Between the longitudinal second indenter 46b and the test piece 8, a signal collector 61 is connected to the data analysis unit 7. The signal collector 61 collects the corresponding pressure data and transmits it to the data analysis unit 7 for analysis and processing.

Referring to Figs. 1-3, a test method for supporting strength of a surrounding rock of a roadway according to the present invention includes the following steps:

The first step is to measure the stress state of the surrounding rock. The stress state of the surrounding rock includes the static stress state and dynamic load impact characteristics. Specifically, it includes: using the stress relief method to measure the static stress state of the surrounding rock of the roadway; using the microseismic system to obtain the surrounding rock of the roadway Nearby dynamic shock characteristics. In this embodiment, a geological drilling rig is used to drill holes in the roadway toward the working surface. A microseismic probe is inserted into the drilled hole, and a seismic pickup is connected, and then connected to the microseismic monitoring system to form a complete monitoring network. , Use the microseismic monitoring system to obtain the magnitude of the microseismic energy during the mining process, and infer the impact load intensity and frequency (dynamic load impact characteristics).

Step 2: Place the prepared test piece 8 in the pressure chamber 41, adjust the positions of the upper indenter 33, the lower indenter 23, the first lateral indenter 44a, and the second lateral indenter 46a. Apply a certain preload.

The third step is to apply a constant X-direction pressure to the test piece 8 through the first transverse indenter 44a and the second transverse indenter 46a according to the static stress state, and apply an axial direction to the test piece 8 through the axial pressure loading unit 2. Pressure; the first longitudinal indenter 44b and the second longitudinal indenter 46b apply the Y-direction support force to the test piece 8 before the impact, the support force is required to be 0 at this time, and the Y-direction support is set according to experience The minimum value of the force is 0 MPa, and the incremental value is also 2 MPa;

Third step: According to the dynamic load impact characteristics, under the condition that the support force in the Y direction is 0 MPa, apply impact loading to the test piece 8 through the impact loading unit 3. After the loading test is completed, observe the damage degree of the test piece;

Step 4: Replace the test piece, keep the X and axial pressures unchanged, increase the support force in the Y direction to 2 MPa, load the test again according to steps 2-3, and so on, and increase the 2 MPa support every time the test piece is replaced. Protective force. Every time the supporting force is increased, observe the damage of the test piece after the loading test, so as to find the supporting force that the test piece will not be damaged, and calculate the supporting strength based on the supporting force. This supporting strength is the roadway. Supporting strength required for surrounding rocks.

In summary, the present invention takes the actual static load stress and dynamic load impact characteristics of the surrounding rock of the roadway as the loading stress, and sets different support strengths for rock deformation and failure tests, which take into account the effects of static load stress and dynamic load stress. The combined effect of the two is also considered, which can better match the actual stress state of the surrounding rock of the roadway on the site, and the obtained support strength can better guarantee the safety and stability of the surrounding rock, high accuracy, and simple and convenient test operation.

The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited to this, and any changes or substitutions that are not thought through without creative labor should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims (7)

  1. A test device for supporting strength of roadway surrounding rock is characterized in that it includes:
    The load-bearing frame unit includes a base, an upright and a cross beam, the uprights are vertically arranged on both sides of the upper surface of the base, and the crossbeam is horizontally fixed at the upper part of the upright;
    An axial pressure loading unit, which is fixed at an intermediate position on the upper surface of the base and is used to apply a bottom-up axial pressure to the test piece;
    An impact loading unit, which is fixed on the beam and is used to apply a top-down axial impact load to the test piece;
    A confining pressure loading unit, which is arranged between the axial pressure loading unit and the impact loading unit, and includes a lateral confining pressure loading unit and a longitudinal confining pressure loading unit for applying a confining pressure in a horizontal plane to the test piece;
    A loading control unit, configured to control the axial pressure loading unit, the impact loading unit, and the confining pressure loading unit to perform loading respectively;
    A monitoring unit, configured to monitor the force of the test piece during the loading process;
    A data analysis unit is connected to the loading control unit, and the data analysis unit is configured to receive data from the monitoring unit and process analysis.
  2. The test device for supporting strength of surrounding rock of a roadway according to claim 1, wherein the axial pressure loading unit comprises an axial pressure loading oil cylinder, an axial pressure loading oil tank, and a lower pressure head, and the axial pressure loading oil cylinder is fixed at the station. On the base, the axial pressure-loading oil tank is connected to the axial pressure-loading cylinder, one end of the lower pressure head is connected to the axial pressure-loading cylinder, and the other end thereof vertically extends into the confining pressure-loading unit. And in contact with the lower surface of the test piece.
  3. The test device for supporting strength of a surrounding rock of a roadway according to claim 2, wherein the axial pressure loading cylinder comprises an axial pressure loading cylinder, an axial pressure loading piston, an axial pressure loading piston rod, and the axial pressure loading cylinder The inside of the body is provided with an oil inlet cavity, the axial pressure loading piston is slidably connected to the axial pressure loading cylinder, and one end of the axial pressure loading piston rod passes through the axial pressure loading piston and extends into the inlet. In the oil chamber, the other end of the axial pressure-loading piston rod is connected to one end of the lower pressure head, wherein an end of one end of the axial pressure-loading piston rod is a curved surface.
  4. The test device for supporting strength of a surrounding rock of a roadway according to claim 1, wherein the impact loading unit comprises an impact loading oil cylinder, an impact loading oil tank, an upper indenter and a pressure bearing column, and the impact loading oil cylinder and the The beam is fixedly connected, and the impact-loading cylinder is connected to the impact-loading tank. One end of the pressure-bearing column is connected to the piston rod of the impact-loading cylinder. The other end is connected to the top of the upper indenter. Connection, the bottom of the upper indenter is in contact with the upper surface of the test piece.
  5. The test device for supporting strength of surrounding rock of a roadway according to claim 4, wherein the confining pressure loading unit comprises a pressure chamber, two confining pressure loading cylinders, a confining pressure loading tank, and two first lateral pressure heads And two second lateral pressure heads, the test piece is set in a pressure chamber, the confining pressure loading tank is connected to the two confining pressure loading cylinders, and the piston rod of the confining pressure loading cylinder is connected to the first The lateral indenters are connected, and the two first lateral indenters are respectively arranged outside the adjacent sides of the pressure chamber, and the two first lateral indenters are horizontally extended into the pressure chamber and tested. Two adjacent side walls of the component are in contact with each other. A groove is respectively provided on the two side walls of the pressure chamber opposite to the first lateral pressure head, and a second lateral direction is installed in both grooves. Indenter, two second lateral indenters are in contact with the other two adjacent side walls of the test piece.
  6. The test device for supporting strength of surrounding rock of a roadway according to claim 5, wherein the monitoring unit comprises a pressure sensor and a signal collector connected to each other, and the pressure sensors are respectively disposed on the pressure bearing column and the upper pressure. Between the head, the second lateral indenter and the test piece, the signal collector is connected to a data analysis unit.
  7. A method for determining strength by using a test device for supporting strength of a surrounding rock of a roadway according to any one of claims 1-6, characterized in that it comprises the following steps:
    Step 1: Use the stress relief method to measure the static stress state of the surrounding rock of the roadway;
    Step 2: Use the microseismic system to obtain the dynamic load characteristics near the surrounding rock of the roadway, and infer the impact load intensity and frequency of the test;
    Step 3: Take the surrounding rock of the roadway to make multiple standard test pieces;
    Step 4: Loading test
    Step 4.1: Place the test piece on the test machine, adjust the position of each indenter of the test machine, and apply a certain pretension force to the test piece;
    Step 4.2: According to the static mechanical state of the surrounding rock of the roadway measured in step 1, the lateral confining pressure loading unit simulates the surrounding pressure of the roadway to apply a fixed X-direction pressure to the test piece, and the axial pressure loading unit applies a test piece to the test piece. Continuously increasing Z-direction pressure; the Y-direction supporting force is applied to the specimen by the longitudinal confining pressure loading unit, and the minimum Y-direction supporting force is set to 0;
    Step 4.3: Apply the minimum Y-direction supporting force to the test piece, and perform impact loading on the test piece according to the strength and frequency of the surrounding rock impact load obtained in step 2. After the impact loading is completed, observe the damage of the test piece;
    Step 4.4: Replace the test piece, keep the pressure in the X direction and the pressure in the Z direction, increase the support force in the Y direction, repeat steps 4.1-4.3 to perform a load test on the replaced test piece, and so on, and every time the test piece is replaced The support force is increased once, and each time the support force is increased, the damage of the test piece is observed after the loading test, so as to find the support force that the test piece will not be damaged, and the support strength is calculated based on the support force. The protection strength is the support strength required for the surrounding rock of the roadway.
PCT/CN2019/076522 2018-12-24 2019-02-28 Tunnel surrounding rock support strength test apparatus and strength determination method WO2019223389A1 (en)

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CN201811580182.9A CN109490086A (en) 2018-12-24 2018-12-24 A kind of supporting roadway surrounding rock strength test device and strength determining method
CN201811580182.9 2018-12-24

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JP2019572072A JP2020525786A (en) 2018-12-24 2019-02-28 Bearing strength test device and strength determination method for rock around a certain (mine) tunnel

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