Rock mechanical parameter testing device and method for electric guide rail control wire cutting

Abstract

The invention discloses a rock mechanical parameter testing device and method for electric guide rail control wire cutting, and belongs to the technical field of geotechnical engineering. Comprising a rock moving unit, a linear cutting unit and a data receiving and processing unit, the rock moving unit comprises an operation table, a horizontal sliding rail is fixed on the operation table, a horizontal sliding block is arranged on the horizontal sliding rail, and a horizontal thrust sensor and a rock clamp which are in rigid contact are fixed on the horizontal sliding block; the linear cutting unit comprises an axial sliding rail opposite to the horizontal sliding rail, an axial sliding block is arranged on the axial sliding rail, a rigid support is fixed to the axial sliding block, and a steel saw blade is fixed to the rigid support through a tension sensor and used for cutting the rock fixed in the rock clamp. The device is suitable for rapidly measuring parameters such as cutting force and vertical pressure of a small-size rock sample under the indoor condition, related parameters can be monitored efficiently, accurately and in real time in a time-saving mode, and a reference is provided for advanced prediction of on-site rock mass mechanical parameters.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering, and relates to a rock mechanics parameter testing device and method for electric guide rail controlled wire cutting. Background Art

[0002] With the rapid development of infrastructure construction and geothermal resource development, complex geological problems encountered in oil extraction, highway and railway transportation engineering construction are becoming more and more frequent. Among them, the randomness of the physical and mechanical properties of deep buried strata has a particularly great impact on engineering construction and oil extraction. In petroleum engineering, how to quickly and accurately obtain the mechanical parameters of underground rock mass is the research focus of scientific and technological workers. As a popular research topic in geotechnical engineering, in order to provide advanced prediction of rock mass mechanical parameters, most of the field conducts indoor digital cutting tests on different rock samples to quickly obtain the mechanical parameters of rocks and provide reference for the design of on-site construction plans. However, the indoor test technology for determining rock strength has strict requirements on the specifications and morphology of the test samples, especially the polishing and shape rectification of the samples, which are cumbersome, time-consuming and expensive. On the other hand, as an important mechanical indicator for measuring the performance of rock engineering, the rock strength is determined by point load test, indentation test, bending tensile test, top plate hollow rock column test, etc. There are not only similar problems such as difficulty in sample preparation, complex steps, high time and economic costs, but also experimental test methods cannot realize the automation and digital control of rock mechanical property test methods. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problems in the prior art that the rock mechanical parameter testing device has not been automated and the testing cost is high, and to provide a rock mechanical parameter testing device and method for electric guide rail controlled wire cutting.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] In a first aspect, the present invention provides a rock mechanical parameter testing device for electric guide rail controlled wire cutting, comprising a rock moving unit, a wire cutting unit and a data receiving and processing unit;

[0006] The rock moving unit comprises an operating platform, a horizontal slide rail is fixed on the operating platform, a horizontal slide block is arranged on the horizontal slide rail, and a rigid contact horizontal thrust sensor and a rock clamp are fixed on the horizontal slide block;

[0007] The wire cutting unit comprises an axial slide rail arranged opposite to the horizontal slide rail, an axial slider is arranged on the axial slide rail, a rigid bracket is fixed on the axial slider, a hacksaw blade is fixed on the rigid bracket via a tension sensor, and is used for cutting the rock fixed in the rock fixture;

[0008] The data receiving and processing unit comprises a saw blade tension wireless signal receiver, a horizontal thrust wireless signal receiver and a data processing device.

[0009] The present invention is further improved in that:

[0010] One end of the hacksaw blade is fixed to one end of the rigid bracket through a first tension sensor, and the other end of the hacksaw blade is fixed to the other end of the rigid bracket through a second tension sensor.

[0011] The hacksaw blade is inlaid with diamond grains.

[0012] The axial slide rail, axial slider and rigid bracket are all arranged in the power end head; the power end head is also provided with a hacksaw blade correction device; the operating table is also provided with a control switch for controlling the circuit on and off of the device.

[0013] In a second aspect, the present invention provides a rock mechanical parameter testing method for electric guide rail controlled wire cutting based on the above equipment, comprising the following steps:

[0014] Establish a rock crushing force balance relationship model under cutting state;

[0015] The force analysis of rock cutting failure unit is carried out based on the force balance relationship model;

[0016] Determine rock cohesion and internal friction angle through force analysis;

[0017] A rock line cutting model based on guide rail control is established through the rock crushing force balance relationship model, rock cohesion and internal friction angle;

[0018] The unconfined compressive strength of rock is determined by a rock line cutting model based on guide rail control.

[0019] Further improvements are:

[0020] The specific model for establishing the rock crushing force balance relationship under the cutting state is as follows:

[0021] The destructive effect of the hacksaw blade on the rock is achieved through the tensile forces F1, F2 and the thrust force F x Realize, in the xy coordinate system, the pulling force F1, F2 and the propulsion force F x Can be decomposed into cutting force F c With the friction force F f :

[0022]

[0023] Cutting force F c With the friction force F f The analytical relationship between them can be expressed as:

[0024] F fy =F fx tanθ (2)

[0025] F cy =F cx tanα (3)

[0026]

[0027] Among them, θ is the contact friction angle between rock and corundum particles; α is the inclination angle of the rock boundary wear surface; τ0 is the normal stress at the wear surface; σ0 is the shear stress at the wear surface; F is the friction angle between rock fragments; cx is the cutting force F c Component force in the X direction; F cy is the cutting force F c Component force in the Y direction; F fx is the friction force F f Component force in the X direction; F fx is the friction force F f Component of force in the Y direction.

[0028] The force analysis of the rock cutting failure unit based on the force balance relationship model is as follows:

[0029] Assuming that the stress state of the wear surface at the end of the rock is uniform, according to the ultimate force equilibrium state, the cutting force F c Component force F in the X direction cx , cutting force F c Component force F in the Y direction cy It can be expressed as:

[0030]

[0031] Where A is the cross-sectional area of ​​the wear end surface; by combining equation (5), the expression of the shear stress σ0 at the wear surface can be obtained:

[0032]

[0033] According to the principle of minimum potential energy, assuming that the crack expands linearly and the expansion angle is β; substituting into equation (4) to analyze the stress under shear fracture conditions, the expression equations and boundary constraints of τ and σ can be obtained:

[0034]

[0035] Among them, β is the crack propagation angle of local fracture of rock, σ0 is the normal stress under shear state in rock groove, and τ0 is the shear stress under shear state in rock groove.

[0036] The rock cohesion and internal friction angle determined by force analysis are:

[0037] Introduction of the Mohr-Coulomb criterion By describing the relationship between τ and σ, the cohesion c can be solved:

[0038]

[0039] Where c is the cohesion of intact rock; is the internal friction angle of intact rock; is the friction angle between rock fragments; and The relationship can be expressed as:

[0040]

[0041] in, It can be solved by the following formula:

[0042]

[0043] The rock line cutting model based on guide rail control is established based on the rock crushing force balance model, rock cohesion and internal friction angle:

[0044] By combining equations (1) to (5), we can get F x With F y The expression is:

[0045]

[0046] Combining formula (8) we can get:

[0047]

[0048] Substituting formula (8) and the calculation formula of cutting cross-sectional area A Dd / cosα (D is the diameter of the flexible steel saw blade, d is the groove depth) into formula (12), the rock line cutting model based on guide rail control is obtained:

[0049]

[0050] In order to improve the adaptability of cutting data in rock cutting test to formula (13), the tensile force F1, F2 measured by the tensile sensor and F in formula (13) are established. y The relationship between them is rewritten as follows:

[0051]

[0052] The unconfined compressive strength of rock is determined as:

[0053] Substitute equations (8) and (9) into the following equation to calculate the unconfined compressive strength of rock:c :

[0054]

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The present invention discloses a rock mechanics parameter testing device for electric guide rail controlled wire cutting, wherein the axial slide rail is used to control the up and down movement of the hacksaw blade, the horizontal slide rail is used to control the movement of the rock toward the hacksaw, and a horizontal thrust sensor is rigidly connected to the rock fixture, and a tension sensor is connected to the hacksaw blade, and the receiver can receive and transmit the data measured by the sensor to a data processing device. The device is suitable for quickly measuring parameters such as cutting force and vertical pressure of small-sized rock samples under indoor conditions, has low requirements on sample size flatness, can be efficient, time-saving, accurate, and can monitor relevant parameters in real time, providing a reference for obtaining advance prediction of on-site rock mass mechanics parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0058] Figure 1 It is a schematic diagram of the overall structure of the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0059] Figure 2 A schematic diagram of rock cutting by the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0060] Figure 3 It is a schematic diagram of the wireless signal transmission and testing technology principle of the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0061] Figure 4 A schematic diagram of a tension sensor and a receiving device of a rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0062] Figure 5 It is a schematic diagram of a horizontal thrust sensor and a receiving device of a rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0063] Figure 6 It is a schematic diagram of the sliding track structure of the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0064] Figure 7 A schematic diagram of the structure of a hacksaw inlaid with diamond grains in the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention;

[0065] Figure 8 It is a force analysis diagram of the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention when cutting rock;

[0066] Fig. 9 This is the force analysis diagram of rock damage during cutting; Fig. 9 (a) is the mirror image force analysis diagram of the wear surface at the end of the rock; Fig. 9 (b) is the stress balance analysis diagram of rock under shear state;

[0067] Fig.10 It is a flow chart of the rock mechanical parameter testing method of the electric guide rail controlled wire cutting in the present invention;

[0068] Fig.11 This is a step diagram of the rock mechanical parameter testing method for electric guide rail controlled wire cutting in the present invention.

[0069] Among them: 1- hacksaw blade correction device; 2- power end; 3- first tension sensor; 4- second tension sensor; 5- horizontal thrust sensor; 6- horizontal slide rail; 7- axial slide rail; 8- operation table; 9- control switch; 10- rock clamp; 11- rock; 12- data processing device; 13- saw blade tension wireless signal receiver; 14- horizontal thrust wireless signal receiver; 15- hacksaw blade; 16- rigid bracket; 601- horizontal slider; 701- axial slider. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0071] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0073] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0074] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0075] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0077] See also Figure 1 and Figure 2 The embodiment of the present invention discloses a rock mechanical parameter testing device for electric guide rail controlled wire cutting, comprising a rock moving unit, a wire cutting unit and a data receiving and processing unit integrated on an experimental operating table; the rock moving unit comprises an operating table 8, such as Figure 6 As shown, a horizontal slide rail 6 is fixed on the operating table 8, a horizontal slider 601 is arranged on the horizontal slide rail 6, and a rigid contact horizontal thrust sensor 5 and a rock clamp 10 are fixed on the horizontal slider 601; the wire cutting unit includes an axial slide rail 7 arranged opposite to the horizontal slide rail 6, an axial slider 701 is arranged on the axial slide rail 7, a rigid bracket 16 is fixed on the axial slider 701, and a hacksaw blade 15 is fixed on the rigid bracket 16 through a tension sensor, as shown in FIG. Figure 7 As shown, the hacksaw blade 15 is inlaid with diamond grains; it is used to cut the rock fixed in the rock fixture 10; Figure 4As shown, one end of the hacksaw blade 15 is fixed to one end of the rigid bracket 16 through the first tension sensor 3, and the other end of the hacksaw blade 15 is fixed to the other end of the rigid bracket 16 through the second tension sensor 4. Figure 3 , Figure 4 and Figure 5 As shown, the data receiving and processing unit includes a saw blade tension wireless signal receiver 13, a horizontal thrust wireless signal receiver 14 and a data processing device 12. The real-time tension and horizontal thrust during the test are connected to the data processing device 12 through the saw blade tension wireless signal receiver 13 and the horizontal thrust wireless signal receiver 14. The second tension sensor 4 and the main body of the rigid bracket 16 are inside the operating table 8. The rigid bracket 16 is fixed to the axial slide rail 7, and the axial slider 701 on the axial slide rail 7 drives the steel saw blade 15 to cut the rock. There is a rigid contact between the rock fixture 10 and the horizontal thrust sensor 5, and they are fixed together on the slider of the horizontal slide rail 6.

[0078] The working process of the rock mechanical parameter testing device for electric guide rail controlled wire cutting in the present invention is as follows:

[0079] The entire cutting process is carried out on the operating table 8. After the control switch 9 is turned on, the horizontal thrust sensor 5 and the rock fixture 8 are driven by the slider on the horizontal slide rail 5a to move along the horizontal slide rail 6 and contact the hacksaw blade 15 to achieve the purpose of continuously cutting the rock. At this time, the first tension sensor 3 and the second tension sensor 4 installed on the hacksaw blade 15 measure the real-time cutting force, and transmit it to the data processing device 12 in real time through the saw blade tension wireless signal receiver 13. The horizontal thrust sensor 5 measures the reverse thrust of the hacksaw blade 15 on the rock 11 and the rock fixture 10, and the vertical cutting force, horizontal thrust and other cutting parameters are recorded in real time through the data processing device 12. The rock 11 is placed in the rock fixture 10, and the rock fixture 10 and the horizontal thrust sensor 5 are fixed on the horizontal slider 601; the horizontal slider 601 is controlled by the control 9 to slide at a set speed on the horizontal slide rail 6 to maintain full contact with the hacksaw blade 15; the cutting action of the hacksaw blade 15 on the rock 11 is controlled by the axial slider 701, and the diamond particles attached to the hacksaw blade 15 cut and scrape the surface of the rock 11. Tension sensors are connected to both ends of the hacksaw blade 15 to obtain the cutting parameters (tension and pulling speed) during the cutting process. The cutting test is carried out on the operating table 8, and the horizontal slide rail 6 is installed on the surface of the operating table 8. The motion parameter signal is received by the saw blade tension wireless signal receiver 13 and the horizontal thrust wireless signal receiver 14 and converted into a digital signal input into the data processing device 12 to complete the recording and analysis of the experimental data. The hacksaw blade 15 extends from the power end 2 installed on the rear side of the operating table 8, and the axial slide rail 7 for controlling the up and down movement of the hacksaw blade 15 is installed under the operating table 8; the two ends of the hacksaw blade 15 are respectively connected to the ends of the rigid bracket 16, and the rigid bracket 16 is fixed to the axial slide rail 7. The movement of the rigid bracket 16 is controlled by the axial slide rail 7, driving the hacksaw blade 15 to cut the rock in the vertical direction; the tension sensor is fixed between the hacksaw blade 15 and the rigid bracket 16 to measure the tension during the cutting process; after starting the control switch 9, the rock 11 fixed on the rock clamp 10 and the horizontal thrust sensor 5 move forward along the slide rail and contact the hacksaw blade that moves up and down, so as to achieve the purpose of continuously cutting the rock. At this time, the two tension sensors installed on the hacksaw blade 15 measure the cutting forces F1 and F2 at the two ends of the hacksaw blade 15; the horizontal thrust sensor 5 measures the reverse thrust F1 of the hacksaw blade 15 on the rock 11 x The above cutting parameters are recorded in real time by the data processing device 12 .

[0080] See also Fig.10 and Fig.11The embodiment of the present invention also discloses a rock mechanical parameter testing method for electric guide rail controlled wire cutting. When the hacksaw blade cuts the rock, due to the stress concentration, a wear surface with an inclination angle of α is first formed at the edge of the rock block, and then a cutting groove is formed on the surface of the rock block. The rock mechanical parameters are measured according to the ultimate force balance analysis of the movement process of a single hacksaw blade. The specific steps are as follows:

[0081] Step 1: Establish a rock crushing force balance relationship model under cutting state;

[0082] The destructive effect of the hacksaw blade on the rock is achieved through the tensile forces F1, F2 and the thrust force F x Realize, in the xy coordinate system, the pulling force F1, F2 and the propulsion force F x Can be decomposed into cutting force F c With the friction force F f ,like Figure 8 As shown:

[0083]

[0084] The cutting and friction between the hacksaw blade and the rock surface first forms a shallow cutting groove, in which small rock fragments gather. The cutting fragments are first compacted in the groove between the saw blade and the rock, and then the rock breaking load is transferred to the bottom of the groove to expand the groove depth. Therefore, the friction between the rock and the saw blade is essentially the relative friction between the rock fragments and the intact rock. Therefore, the cutting force F c With the friction force F f The analytical relationship between them can be expressed as:

[0085] F fy =F fx tanθ (2)

[0086] F cy =F cx tanα (3)

[0087]

[0088] Among them, θ is the contact friction angle between rock and corundum particles; α is the inclination angle of the rock boundary wear surface; τ0 is the normal stress at the wear surface; σ0 is the shear stress at the wear surface; F is the friction angle between rock fragments; cx is the cutting force F c Component force in the X direction; F cy is the cutting force F c Component force in the Y direction; F fx is the friction force F f Component force in the X direction; F fx is the friction force Ff Component of force in the Y direction.

[0089] Step 2: Perform force analysis on the rock cutting failure unit based on the force balance relationship model;

[0090] like Fig. 9 As shown in a, assuming that the stress state of the end wear surface is uniform, according to the ultimate force equilibrium state, the cutting force F c Component force F in the X direction cx , cutting force F c Component force F in the Y direction cy It can be expressed as:

[0091]

[0092] Where A is the cross-sectional area of ​​the wear end surface; the expression of σ0 can be obtained by combining equation (5):

[0093]

[0094] like Fig. 9 As shown in Fig. b, the destructive effect of the diamond particles in the cutting groove can be further analyzed as the shear fracture of the detailed rock. According to the principle of minimum potential energy, assuming that the crack expands linearly with an expansion angle of β; substituting into equation (4) to analyze the stress under shear fracture conditions, the expression equations of τ and σ and the boundary constraint conditions can be obtained:

[0095]

[0096] Among them, β is the crack propagation angle of local fracture of rock, σ0 is the normal stress under shear state in rock groove, and τ0 is the shear stress under shear state in rock groove.

[0097] Step 3: Determine the rock cohesion and internal friction angle through force analysis;

[0098] Introduction of the Mohr-Coulomb criterion By describing the relationship between τ and σ, the cohesion c can be solved:

[0099]

[0100] Where c is the cohesion of intact rock; is the internal friction angle of intact rock; is the friction angle between rock fragments; and The relationship can be expressed as:

[0101]

[0102] in, It can be solved by the following formula:

[0103]

[0104] Step 4: Establish a rock line cutting model based on guide rail control through the rock crushing force balance relationship model, rock cohesion and internal friction angle;

[0105] By combining equations (1) to (5), we can get F x With F y The expression is:

[0106]

[0107] Combining formula (8) we can get:

[0108]

[0109] Substitute equation (8) in step 3 and the calculation formula of cutting cross-sectional area A Dd / cosα (D is the diameter of the flexible steel saw blade, d is the groove depth) into equation (12) to obtain the rock line cutting model based on guide rail control:

[0110]

[0111] In order to improve the adaptability of cutting data in rock cutting test to formula (13), the tensile force F1, F2 measured by the tensile sensor and F in formula (13) are established. y The relationship between them is rewritten as follows:

[0112]

[0113] In formula (14), the equation contains the following measurement parameters: F x 、F 1(2) ,θ 1(2) , α, D, d; indirect parameters: All of them can be determined based on the wire cutting test. According to formulas (8) and (9), the strength parameters of the tested rock type, cohesion c, internal friction angle,

[0114] Step 5, determining the unconfined compressive strength of rock through a rock line cutting model based on guide rail control;

[0115] Substitute equation (8) and equation (9) into the following equation to calculate the unconfined compressive strength of rock: c :

[0116]

[0117] Through wireless transmission between the dynamic sensor and the computer, the digital signal is transmitted to the application on the computer, and the vertical cutting force and horizontal thrust in the rock cutting process are monitored and processed in real time, and finally the rock strength parameters are obtained.

[0118] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rock mechanical parameter testing device for electric guide rail controlled wire cutting, characterized in that: It includes a rock moving unit, a wire cutting unit and a data receiving and processing unit; The rock moving unit comprises an operating platform (8), a horizontal slide rail (6) is fixed on the operating platform (8), a horizontal slide rail (6) is provided on the horizontal slide rail (6), and a rigid contact horizontal thrust sensor (4) and a rock clamp (10) are fixed on the horizontal slide rail (601); The wire cutting unit comprises an axial slide rail (7) arranged opposite to the horizontal slide rail (6), an axial slider (701) being arranged on the axial slide rail (7), a rigid bracket (16) being fixed on the axial slider (701), a hacksaw blade (15) being fixed on the rigid bracket (16) via a tension sensor, and being used for cutting rocks fixed in a rock fixture (10); The data receiving and processing unit comprises a saw blade pulling force wireless signal receiver (13), a horizontal thrust wireless signal receiver (14) and a data processing device (12).

2. The rock mechanical parameter testing device for electric guide rail controlled wire cutting according to claim 1 is characterized in that: One end of the hacksaw blade (15) is fixed to one end of a rigid bracket (16) via a first tension sensor (3), and the other end of the hacksaw blade (15) is fixed to the other end of the rigid bracket (16) via a second tension sensor (4).

3. The rock mechanical parameter testing device for electric guide rail controlled wire cutting according to claim 1 is characterized in that: The hacksaw blade (15) is inlaid with diamond grains.

4. The rock mechanical parameter testing device for electric guide rail controlled wire cutting according to claim 1 is characterized in that: The axial slide rail (7), the axial slider (701) and the rigid bracket (16) are all arranged in the power end head (2); the power end head (2) is also provided with a hacksaw blade correction device (1); the operating table (6) is also provided with a control switch (7) for controlling the on and off of the circuit of the device.

5. A method for testing rock mechanical parameters of electric guide rail controlled wire cutting based on the equipment according to any one of claims 1 to 4, characterized in that: The following steps are involved: Establish a rock crushing force balance relationship model under cutting state; The force analysis of rock cutting failure unit is carried out based on the force balance relationship model; Determine rock cohesion and internal friction angle through force analysis; A rock line cutting model based on guide rail control is established through the rock crushing force balance relationship model, rock cohesion and internal friction angle; The unconfined compressive strength of rock is determined by a rock line cutting model based on guide rail control.

6. The rock mechanical parameter testing method of electric guide rail controlled wire cutting according to claim 5 is characterized in that: The specific model for establishing the rock crushing force balance relationship under the cutting state is as follows: The destructive effect of the hacksaw blade on the rock is achieved through the tensile forces F1, F2 and the thrust force F x Realize, in the xy coordinate system, the pulling force F1, F2 and the propulsion force F x Can be decomposed into cutting force F c With the friction force F f : Cutting force F c With the friction force F f The analytical relationship between can be expressed as: F fy =F fx tanθ (2) F cy =F cx tanα (3) Among them, θ is the contact friction angle between rock and corundum particles; α is the inclination angle of the rock boundary wear surface; τ0 is the normal stress at the wear surface; σ0 is the shear stress at the wear surface; F is the friction angle between rock fragments; cx is the cutting force F c Component force in the X direction; F cy is the cutting force F c Component force in the Y direction; F fx is the friction force F f Component force in the X direction; F fx is the friction force F f Component of force in the Y direction.

7. The rock mechanical parameter testing method of electric guide rail controlled wire cutting according to claim 6 is characterized in that: The force analysis of the rock cutting failure unit based on the force balance relationship model is as follows: Assuming that the stress state of the wear surface at the end of the rock is uniform, according to the ultimate force equilibrium state, the cutting force F c Component force F in the X direction cx , cutting force F c Component force F in the Y direction cy It can be expressed as: Where A is the cross-sectional area of ​​the wear end surface; by combining equation (5), the expression of the shear stress σ0 at the wear surface can be obtained: According to the principle of minimum potential energy, assuming that the crack expands linearly and the expansion angle is β; substituting into equation (4) to analyze the stress under shear fracture conditions, the expression equations and boundary constraints of τ and σ can be obtained: Among them, β is the crack propagation angle of local fracture of rock, σ0 is the normal stress under shear state in rock groove, and τ0 is the shear stress under shear state in rock groove.

8. The rock mechanical parameter testing method of electric guide rail controlled wire cutting according to claim 7 is characterized in that: The rock cohesion and internal friction angle determined by force analysis are: Introduction of the Mohr-Coulomb criterion By describing the relationship between τ and σ, the cohesion c can be solved: Where c is the cohesion of intact rock; is the internal friction angle of intact rock; is the friction angle between rock fragments; and The relationship can be expressed as: in, It can be solved by the following formula:

9. The rock mechanical parameter testing method of electric guide rail controlled wire cutting according to claim 8 is characterized in that: The rock line cutting model based on guide rail control is established based on the rock crushing force balance model, rock cohesion and internal friction angle: By combining equations (1) to (5), we can get F x With F y The expression is: Combining formula (8) we can get: Substituting formula (8) and the calculation formula of cutting cross-sectional area A Dd / cosα (D is the diameter of the flexible steel saw blade, d is the groove depth) into formula (12), the rock line cutting model based on guide rail control is obtained: In order to improve the adaptability of cutting data in rock cutting test to formula (13), the tensile force F1, F2 measured by the tensile sensor and F in formula (13) are established. y The relationship between them is rewritten as follows:

10. The rock mechanical parameter testing method of electric guide rail controlled wire cutting according to claim 9, characterized in that: The unconfined compressive strength of rock is determined as: Substitute equations (8) and (9) into the following equation to calculate the unconfined compressive strength of rock σ c :

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