CN105628499A - Method for confirming breakage parameter of rock - Google Patents

Abstract

The present application discloses methods for determining fracture parameters of rocks. A specific implementation of the method includes: applying pressure to a spherical rock sample provided with prefabricated cracks; recording the angle value between the direction of the loaded pressure and the direction of the prefabricated crack and the numerical value of the loaded pressure; based on the angle value and the value of the applied pressure determine the fracture parameters of the rock. This embodiment makes the determination of rock fracture parameters more accurate and has a wider application range.

Description

Method for Determining Fracture Parameters of Rock

technical field

The present application relates to the technical field of geotechnical engineering, in particular to the field of rock mechanical performance testing, and in particular to a method for determining rock fracture parameters.

Background technique

With the continuous deepening of human development and utilization of natural resources, shallow resources are decreasing day by day, and mining has entered the stage of deep rock mass engineering. Due to the high ground stress, high ground temperature, and high seepage water pressure environment where the deep rock mass is located, the mechanical response of the deep rock mass is significantly different from that of the shallow rock mass.

Rock fracture mechanics takes the fracture toughness of rock as the basic parameter, takes the crack and propagation process of rock material as the research content, and explores the fracture mechanism of rock material as the research goal. In rock drilling, excavation, blasting, cutting and other engineering activities, the principles, methods and techniques of rock fracture mechanics can be used to analyze the strength, stability and fracture of rock structures; effectively apply the theory of rock fracture mechanics In the research of rock mass collapse instability and crack propagation in the field of rock mass engineering, it is helpful to solve the relevant engineering practice of rock mass engineering.

The accuracy of rock fracture parameter testing has important guiding significance for actual deep rock mass engineering. Existing test methods cannot be applied to the current wide application prospects, and cannot meet the urgent needs of rock performance testing. How to improve the accuracy of the test so as to better guide the practice of deep rock mass engineering is a goal that is constantly being pursued in the field of rock mechanics. .

Contents of the invention

The purpose of this application is to propose an improved method for determining rock fracture parameters to solve the technical problems mentioned in the background art section above.

The application provides a method for determining the fracture parameters of rock, the method comprising:

Loading pressure on a spherical rock sample provided with prefabricated cracks; recording the angle value between the direction of the loaded pressure and the direction of the prefabricated crack and the numerical value of the loaded pressure; Fracture parameters of the rock.

In some embodiments, the applied pressure includes at least one of the following: unidirectional pressure, confining pressure, and pore fluid pressure, wherein the unidirectional pressure refers to the pressure applied in a single direction.

In some embodiments, the fracture parameters include at least one of the following: opening fracture toughness, sliding fracture toughness, and tearing fracture toughness.

In some embodiments, the spherical rock sample includes a pre-fabricated crack that runs through the spherical rock sample, and the pre-fabricated crack is set with the straight line where the diameter of the spherical rock sample is located as the axis of symmetry and is located on the plane where the axis of symmetry is located. Inside.

In some embodiments, the spherical rock sample includes a circular hole passing through the spherical rock sample, the circular hole having an axis of symmetry of the pre-crack.

In some embodiments, the method further includes: setting a pre-crack on the spherical rock sample, wherein the depth value of the pre-crack is set based on the diameter of the spherical rock sample.

In some embodiments, the spherical rock sample includes two prefabricated cracks, and the depth value is 1/20-1/10 of the diameter.

In some embodiments, it is characterized in that the determination of the rock fracture parameters based on the angle value and the loaded pressure value includes: obtaining the critical data of the fracture of the spherical rock sample, the fracture The critical data includes the angle value between the direction of the loaded unidirectional pressure and the direction of the prefabricated crack when the spherical rock sample breaks and the value of the loaded pressure; the fracture parameters of the rock are determined based on the cracked critical data.

In some embodiments, said determining fracture parameters of said rock based on said fracture critical data comprises:

The fracture parameters of the rock are calculated based on the critical data of the fracture and the characteristics of the spherical rock sample, and the characteristics include the diameter of the spherical rock sample and the depth value of the prefabricated crack.

In some embodiments, the calculation of the fracture parameters of the rock based on the critical data of the fracture and the characteristics of the spherical rock sample includes: based on the critical data of the fracture of at least one spherical rock sample, the spherical rock test The fracture parameters of the rock are calculated based on the characteristics of the sample.

The method for determining the fracture parameters of the rock provided by the present application is to apply pressure to a spherical rock sample provided with pre-fabricated cracks, and record the angle value between the direction of the loaded pressure and the direction of the pre-fabricated cracks and the numerical value of the loaded pressure, and finally The fracture parameters of the rock are determined based on the angle value and the value of the loaded pressure. This method makes the determination of the fracture parameters of the rock more accurate and has a wider application range.

Description of drawings

Other characteristics, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 a is a kind of exemplary structural representation of the spherical rock sample that can be applied to the present application;

Fig. 1b is a schematic diagram of a scene loaded with unidirectional pressure according to the determination method of rock fracture parameters of the present application;

Fig. 1c is a schematic diagram of a scene of loading pressure according to the method for determining the fracture parameters of rocks in the present application;

Fig. 2 is a flow chart of an embodiment of a method for determining a fracture parameter of a rock according to the present application;

Fig. 3 is a flow chart of another embodiment of the method for determining the fracture parameter of rock according to the present application;

Fig. 4 is an exemplary flow chart of a method for preparing a spherical rock sample that can be applied to the method for determining rock fracture parameters of the present application.

detailed description

The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

Please refer to Fig. 1a and Fig. 2, Fig. 1a is a schematic diagram of an exemplary structure of a spherical rock sample that can be applied to this application. Fig. 2 shows a flow 200 of an embodiment of a method for determining a rock fracture parameter according to the present application. The method for determining the fracture parameters of the above-mentioned rock comprises the following steps:

Step 201, applying pressure to a spherical rock sample provided with prefabricated cracks.

As shown in FIG. 1a, in this embodiment, the rock sample is spherical and prefabricated with cracks 101 in advance. By processing the rock mass, a spherical rock sample 100 for testing can be obtained.

In some optional implementations of this embodiment, the pre-crack 101 is arranged with the straight line where the diameter of the spherical rock sample 100 is located as the axis of symmetry, and the pre-crack 101 is located in the plane where the diameter is located. The above-mentioned spherical rock sample 100 includes at least one prefabricated crack 101 . As an example, a prefabricated crack can be set, and the prefabricated crack itself is an axisymmetric figure, and the diameter of the spherical rock sample is taken as the axis of symmetry. As another example, two pre-fabricated cracks may also be provided, the two pre-fabricated cracks take the straight line where the diameter of the spherical rock sample is located as the axis of symmetry, and the two pre-fabricated cracks are coplanar with the axis of symmetry.

In some optional implementation manners of this embodiment, the spherical rock sample 100 includes a prefabricated crack 101 penetrating through the spherical rock sample. The prefabricated crack 101 running through the spherical rock sample 100 means that at least two ends of the prefabricated crack communicate with the outer surface of the spherical rock sample.

In some optional implementation manners of this embodiment, the types of pre-cracks include but are not limited to any of the following: straight cracks and V-shaped cracks. The above-mentioned straight crack refers to a crack whose cross section is rectangular; the above-mentioned V-shaped crack refers to a crack whose cross-section is V-shaped.

In some optional implementations of this embodiment, the spherical rock sample includes a circular hole 102 , the circular hole 102 runs through the spherical rock sample 100 , and the circular hole 102 takes the axis of symmetry of the prefabricated crack 101 as an axis.

In some optional implementations of this embodiment, before applying pressure to the spherical rock sample provided with pre-cracks, pre-cracks are set on the spherical rock sample, wherein the above-mentioned The depth value of the precrack.

In some optional implementation manners of this embodiment, the spherical rock sample includes two prefabricated cracks, and the above-mentioned depth value is 1/20-1/10 of the above-mentioned diameter. The aforementioned precracks are straight cracks. As an example, the diameter of the circular hole is 1/20 of the diameter of the spherical rock sample, the width of the prefabricated crack is 1/100 of the diameter of the spherical rock sample, and the depth of the prefabricated crack is 1/20 to 1 /10.

In this embodiment, it is optional but not limited to use a pressure loading instrument to apply pressure to the spherical rock sample. Here, the pressure loading instrument refers to a commercially available instrument capable of applying pressure to the above-mentioned spherical rock sample. Preferably, a pressure loading instrument capable of determining the direction and value of loading on the above-mentioned spherical rock sample is selected. Since the pressure loading apparatus is well known to those skilled in the art, it will not be described in detail here.

In some optional implementations of this embodiment, the above-mentioned loaded pressure includes at least one of the following: unidirectional pressure, confining pressure, and pore fluid pressure, and the above-mentioned unidirectional pressure refers to the pressure loaded in a single direction. As an example, please refer to FIG. 1b, which shows a schematic diagram of a scene loaded with unidirectional pressure. When loading the unidirectional pressure, first, place the spherical rock sample 100 with prefabricated cracks on the pressure loading platform of the unidirectional pressure testing machine, adjust the symmetry axis of the prefabricated cracks 101 to a horizontal state, and adjust the prefabricated cracks 101 to vertical state. Next, adjust the unidirectional pressure testing machine to preload the spherical rock sample 100. The purpose of the preloading includes but is not limited to confirming that the spherical rock sample 100 is in good contact with the pressure loading parts of the unidirectional pressure testing machine. Then, a unidirectional pressure is applied to the spherical rock sample 100 until the spherical rock sample 100 breaks.

In some optional implementation manners of this embodiment, the load or displacement rate is selected to control the loading process of the pressure.

In some optional implementation manners of this embodiment, the pressure applied to the spherical rock sample increases from small to large until the spherical rock sample breaks. The increment of the applied pressure may be the same, or the pressure may be applied in a manner that the increment decreases successively.

Step 202, recording the angle value between the direction of the applied pressure and the direction of the pre-crack and the value of the applied pressure.

In this embodiment, the angle value between the prefabricated crack of the spherical rock sample and the direction of the applied pressure is determined and recorded, and when the above angle value is determined, the value of the applied pressure is recorded.

In some optional implementations of this embodiment, the angle value between the direction of the loaded unidirectional pressure and the direction of the pre-crack is determined and recorded, and the direction of the loaded confining pressure, pore fluid pressure and the direction of the pre-crack is recorded as 0.

In some optional implementation manners of this embodiment, recording the value of the applied pressure includes: recording the value of the applied pressure in a predetermined manner. As an example, the pressure value for each loading is recorded during loading pressure. As an example, at the beginning of the loading pressure period, the value of the loaded pressure is recorded every time the pressure is loaded three times; after the loading pressure reaches a certain value, the pressure value of each loading is recorded.

In some optional implementations of this embodiment, multiple spherical rock samples of the same rock mass are prepared in advance, and the parameters of the multiple spherical rock samples are the same, and the parameters of the spherical rock samples refer to the parameters of the spherical rock samples. diameter, type of precrack, etc. The angle values between the prefabricated cracks and the loading direction of the pressure are different for different spherical rock samples.

Step 203, determining the fracture parameter of the rock based on the angle value and the value of the applied pressure.

In some optional implementations of this embodiment, the above-mentioned fracture parameters include the fracture toughness of the opening type, the fracture toughness of the sliding type, the fracture toughness of the tearing type, or the composite toughness of the above-mentioned several types of fracture toughness. at least one. The above-mentioned opening type fracture toughness refers to the fracture toughness under the condition that the tensile stress is perpendicular to the crack propagation surface, the crack opens along the force direction, and expands along the crack surface; the above-mentioned sliding type fracture toughness refers to the shear stress acting on the crack in parallel. surface, and perpendicular to the crack line, the fracture toughness under the condition that the crack slides and expands parallel to the crack surface; the above-mentioned tearing fracture toughness means that the shear stress acts on the crack surface Fracture toughness with tear propagation.

In this embodiment, different types of fracture parameters are determined according to the difference in the value of the angle between the pre-crack and the pressure loading direction.

In some optional implementations of this embodiment, the determined fracture toughness type changes according to the above angle value, for example, when the angle between the pre-crack and the pressure loading direction is 0 degrees, according to the value of the applied pressure , to determine the slide-open fracture toughness of this rock.

The method provided by the above-mentioned embodiments of the present application loads pressure on a spherical rock sample provided with prefabricated cracks, and records the angle value between the direction of the loaded pressure and the direction of the prefabricated crack and the numerical value of the loaded pressure, and finally based on the angle value The fracture parameters of the rock are determined by the values of the applied pressure and the loaded pressure. This method makes the determination of the fracture parameters of the rock more accurate and has a wider range of application.

Continue to refer to FIG. 3 and FIG. 1 c , wherein FIG. 3 shows a flow 300 of an embodiment of a method for determining a rock fracture parameter according to the present application. Figure 1c shows a schematic diagram of a stress-loaded scenario. The method for determining the fracture parameters of the above-mentioned rock comprises the following steps:

In step 301, a unidirectional pressure, confining pressure and pore fluid pressure are applied to a spherical rock sample provided with prefabricated cracks.

In this embodiment, the rock sample is spherical and prefabricated with cracks 101 . By processing the rock mass, a spherical rock sample 100 for testing can be obtained.

In some optional implementations of this embodiment, the pre-crack 101 is arranged with the straight line where the diameter of the spherical rock sample 100 is located as the axis of symmetry, and the pre-crack 101 is located in the plane where the diameter is located. The above-mentioned spherical rock sample 100 includes at least one prefabricated crack 101 . As an example, a prefabricated crack can be set, and the prefabricated crack itself is an axisymmetric figure, and the diameter of the spherical rock sample is taken as the axis of symmetry. As another example, two pre-fabricated cracks may also be provided, the two pre-fabricated cracks take the straight line where the diameter of the spherical rock sample is located as the axis of symmetry, and the two pre-fabricated cracks are coplanar with the axis of symmetry.

In some optional implementation manners of this embodiment, the spherical rock sample 100 includes a prefabricated crack 101 penetrating through the spherical rock sample. The prefabricated crack 101 running through the spherical rock sample 100 means that at least two ends of the prefabricated crack communicate with the outer surface of the spherical rock sample.

In some optional implementations of this embodiment, before applying pressure to the spherical rock sample, the pressure chamber 103 that is convenient for applying confining pressure to the spherical rock sample is pre-processed. The interior of the pressure chamber 103 can be any of the following shapes: Choose one: cylindrical, cubic. As an example, the above-mentioned pressure chamber 103 is cylindrical, wherein the inner diameter of the above-mentioned cylindrical pressure chamber is slightly larger than the diameter of the spherical rock sample, and the above-mentioned pressure chamber is provided with a pressure loading channel for loading unidirectional pressure in the vertical direction. The loading platform enters and exits the pressure chamber through the one-way pressure loading channel.

In some optional implementations of this embodiment, the spherical rock sample is placed on the vertical loading platform of the pressure testing instrument, and then the pressure chamber is sleeved on the outside of the vertical loading platform of the pressure testing instrument and fixed. Then, adjust the position of the vertical loading platform, load a certain initial unidirectional pressure on the above-mentioned spherical rock sample, and preload the confining pressure on the above-mentioned spherical rock sample.

In some optional implementation manners of this embodiment, the load or displacement rate is selected to control the loading process of the pressure.

In some optional implementation manners of this embodiment, the pressure applied to the spherical rock sample increases from small to large until the spherical rock sample breaks. The increment of the applied pressure may be the same, or the pressure may be applied in a manner that the increment decreases successively.

Step 302, recording the angle value between the direction of the applied pressure and the direction of the pre-crack and the value of the applied pressure.

In this embodiment, the angle value between the direction of the loaded unidirectional pressure and the direction of the pre-crack is determined and recorded, and the direction of the loaded confining pressure, pore fluid pressure and the direction of the pre-crack is recorded as 0.

In this embodiment, when the angle value between the direction of the loaded unidirectional pressure and the direction of the pre-crack is determined, the values of the loaded unidirectional pressure, confining pressure and pore fluid pressure are recorded.

In some optional implementation manners of this embodiment, the pressure value of each loading is recorded during the pressure loading period.

In some optional implementations of this embodiment, multiple spherical rock samples of the same rock mass are prepared in advance, and the parameters of the multiple spherical rock samples are the same, and the parameters of the spherical rock samples refer to the parameters of the spherical rock samples. Diameter, way of pre-crack setting, etc. The angle values between the prefabricated cracks and the loading direction of the pressure are different for different spherical rock samples.

In some optional implementation manners of this embodiment, the pressure applied to the spherical rock sample increases from small to large until the spherical rock sample breaks. The increments of the loaded pressure can be the same, or can be set in a manner that the increments decrease successively.

In step 303, the critical data of the fracture of the above-mentioned spherical rock sample is obtained.

In this embodiment, the critical data of the above-mentioned rupture includes the angle value between the direction of the unidirectional pressure determined to be loaded and the direction of the prefabricated crack when the spherical rock sample ruptures, the value of the unidirectional pressure, the value of the confining pressure and the pore fluid pressure value.

Step 304, determining rock fracture parameters based on fracture critical data.

In this embodiment, based on the fracture critical data, the stress intensity factor of the prefabricated crack tip under the joint action of confining pressure and pore pressure is calculated, and the rock fracture parameters under the joint action of confining pressure and pore fluid pressure are determined.

In some optional implementation manners of this embodiment, the determination of the fracture parameters of the rock based on the critical fracture data includes: calculating the fracture parameters of the rock based on the critical fracture data and the characteristics of the spherical rock sample. Fracture parameters, the above-mentioned characteristics include the diameter of the above-mentioned spherical rock sample, and the depth value of the above-mentioned prefabricated crack. Optionally, the above-mentioned characteristics further include a width value of the above-mentioned pre-crack.

In some optional implementation manners of this embodiment, the fracture parameter of the rock is calculated based on the fracture critical data of at least one spherical rock sample and the characteristics of the spherical rock sample. As an example, multiple spherical rock samples of the same rock mass are prepared in advance, and the parameters of the multiple spherical rock samples are the same, and the parameters of the spherical rock samples refer to the diameter of the spherical rock sample, the type of prefabricated cracks, and the like. The angle values between the prefabricated cracks and the loading direction of the pressure are different for different spherical rock samples.

In some optional implementations of this embodiment, the above-mentioned fracture parameters include the fracture toughness of the opening type, the fracture toughness of the sliding type, the fracture toughness of the tearing type, or the composite toughness of the above-mentioned several types of fracture toughness. at least one.

It can be seen from FIG. 3 that, compared with the embodiment corresponding to FIG. 2 , the flow 300 of the method for determining rock fracture parameters in this embodiment highlights the accuracy of the fracture parameters under the conditions of confining pressure and pore fluid pressure. To determine, and to determine the fracture parameter is to select the value of the pressure loaded when the spherical rock sample breaks. The fracture parameters determined in this embodiment can be more accurately applied in deep engineering practice.

Continuing to refer to FIG. 4 , which shows an exemplary flow 400 of a method for preparing a spherical rock sample that can be applied to the method for determining a rock fracture parameter of the present application.

Step 401, preparing a spherical sample from the rock mass.

In this embodiment, stone ball processing equipment is used to process a spherical sample, wherein the diameter of the spherical sample is determined according to the test plan.

Step 402, processing a cube-shaped box.

In this embodiment, a cube-shaped box is processed, with a circular hole in the center of the upper and lower sides of the box, and a threaded hole in each of the four sides of the cube-shaped box, and corresponding screws are provided.

In some optional implementations of this embodiment, the diameter of the circular holes on the upper and lower sides of the box is 1/10 of the diameter of the spherical rock sample.

In step 403, the spherical sample is fixed in a cube-shaped box, and a circular hole is processed.

In this embodiment, a spherical sample is placed in a cube-shaped case, and then the above-mentioned spherical sample is fixed in the cube-shaped case. Put the spherical sample and the box fixed in the box on the drilling and milling machine, fix the above box, align the drill bit with the selected diameter with the round hole on the upper surface of the box, and then drill a round hole on the spherical sample, the above round hole Through the above spherical specimen.

Step 404, processing pre-cracks.

In this embodiment, the spherical sample is fixed on the stage of the diamond wire cutting machine, and then the diamond wire is passed through the above-mentioned circular hole, and the wire cutting is performed according to a predetermined size to cut a prefabricated crack of a predetermined depth.

In some optional implementations of this embodiment, two pre-fabricated cracks are set, the two pre-fabricated cracks take the straight line where the diameter of the spherical rock sample is located as the axis of symmetry, and the two pre-fabricated cracks are coplanar with the axis of symmetry. Pass the diamond wire through the circular hole, perform wire cutting according to a predetermined size, and cut a first pre-crack and a second pre-crack with a predetermined depth.

The preparation method of the spherical sample provided by the above-mentioned embodiments of the present application is to prepare the spherical sample from the rock mass; process the cube-shaped box; fix the spherical sample in the cube-shaped box and process the circular hole; process the prefabricated crack. Realize the high efficiency and accuracy of spherical rock sample preparation which can be applied to the method for determining the rock fracture parameters of the present application.

Those skilled in the art can understand that the method 400 for preparing a spherical rock sample also includes some other known steps, such as pretreatment of spherical samples, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these known structures are shown in FIG. 4 not shown in

In particular, the flowcharts and block diagrams in the figures illustrate the functions and operations of possible implementations of methods and products according to various embodiments of the present application. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified functions or operations , or may be implemented by a combination of dedicated hardware and computer instructions.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, and should also cover the technical solutions formed by the above-mentioned technical features or without departing from the above-mentioned inventive concept. Other technical solutions formed by any combination of equivalent features. For example, a technical solution formed by replacing the above-mentioned features with technical features with similar functions disclosed in (but not limited to) this application.

Claims (10)

1. A method for determining the fracture parameters of rock, characterized in that the method comprises: Apply pressure to a spherical rock sample with prefabricated cracks; Record the angle value between the direction of the loaded pressure and the direction of the pre-crack and the value of the loaded pressure; A fracture parameter of the rock is determined based on the value of the angle and the value of the applied pressure. 2. The method for determining the fracture parameters of rock according to claim 1, wherein the loaded pressure comprises at least one of the following: One-way pressure, confining pressure, pore fluid pressure, wherein the one-way pressure refers to the pressure applied in one direction. 3. the method for determining the fracture parameter of rock according to claim 1, is characterized in that, described fracture parameter comprises following at least one: Opening fracture toughness, sliding fracture toughness, tearing fracture toughness. 4. the determining method of the fracture parameter of rock according to claim 1, is characterized in that, described spherical rock sample comprises the prefabricated crack that runs through described spherical rock sample, and described prefabricated crack is with described spherical rock sample The straight line of the diameter of is set as the axis of symmetry and is located in the plane of the axis of symmetry. 5. the method for determining the fracture parameter of rock according to claim 4, is characterized in that, described spherical rock sample comprises the circular hole that runs through described spherical rock sample, and described circular hole is symmetrical with described prefabricated crack. The axis is the axis. 6. The method for determining the fracture parameters of rock according to claim 5, characterized in that, the method also includes: setting a prefabricated crack on a spherical rock sample, wherein the depth value of the prefabricated crack is based on the spherical The diameter setting for the rock sample. 7. The method for determining rock fracture parameters according to claim 6, wherein the spherical rock sample includes two prefabricated cracks, and the depth value is 1/20-1/10 of the diameter. 8. The method for determining the fracture parameter of rock according to any one of claims 1 to 7, wherein said determining the fracture parameter of said rock based on said angle value and said loaded pressure comprises : Acquiring the critical data of the rupture of the spherical rock sample, the critical data of the rupture includes the angle value between the direction of the unidirectional pressure applied when the spherical rock sample is ruptured and the direction of the prefabricated crack, and the value of the applied pressure; A fracture parameter of the rock is determined based on the fracture critical data. 9. The method for determining the fracture parameter of rock according to claim 8, wherein determining the fracture parameter of the rock based on the critical data of the fracture comprises: The fracture parameters of the rock are calculated based on the critical data of the fracture and the characteristics of the spherical rock sample, and the characteristics include the diameter of the spherical rock sample and the depth value of the prefabricated crack. 10. The method for determining the fracture parameter of rock according to claim 9, wherein the calculation of the fracture parameter of the rock based on the critical data of the fracture and the characteristics of the spherical rock sample comprises: Fracture parameters of the rock are calculated based on critical data for fracture of at least one spherical rock sample, characteristics of the spherical rock sample.