Rock eccentric non-coupling charge blasting cracking evaluation method and device

Abstract

The embodiment of the invention provides a rock eccentricity non-coupling charge blasting cracking evaluation method, device and equipment and a computer readable storage medium. The method comprises the following steps: acquiring working condition parameters; inputting the working condition parameters into a constructed eccentric non-coupling charge blasting fracturing evaluation model to obtain a fracture eccentric distribution range; wherein the eccentric non-coupling charge blasting cracking evaluation model can be constructed by the following steps: acquiring initial pressure of each point of a rock blasting hole wall and stress characteristic conditions on a damage conjugate surface; calculating the radius of the crushing area of each point of the hole wall based on the stress characteristic condition on the damaged conjugate surface and the initial pressure; and on the basis of the radius of the crushing area of each point of the hole wall and the obtained radial stress and circumferential stress characteristics of the fracture area, an eccentric uncoupled charge blasting fracturing evaluation model is constructed. In this way, the eccentric distribution range of rock blasting cracking can be effectively evaluated, and theoretical guidance is provided for blast hole scheme design.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of rock blasting, and in particular to a method, device, equipment and computer-readable storage medium for evaluating rock fracturing caused by eccentric uncoupled charge blasting. Background Art

[0002] The drilling and blasting construction technology is widely used in tunnel rock excavation. The application of this technology will inevitably lead to new cracks in the rock mass, which can easily become seepage channels for groundwater. In severe cases, it may cause the collapse of the primary support surrounding rock, posing a major safety hazard. In order to ensure that the outer contour of the tunnel formed by excavation is close to the design, uncoupled charges are often used to control the blasting effect. However, in actual projects, the radial direction of the blasthole is mostly vertical or has a certain inclination angle with the face. Under the action of gravity, the center of the charge roll deviates from the center of the blasthole, and there is an obvious eccentricity phenomenon, which makes the design theory of the concentric uncoupled charge structure no longer applicable.

[0003] In order to improve the reliability of actual blasting projects and fill the gap in the assessment of the scope of rock damage cracks caused by uncoupled charge blasting, related research has been carried out mainly from three aspects: experiment, numerical simulation and theoretical analysis. Experimental research found that the stress, damage and crack distribution of rock after eccentric uncoupled charge blasting is consistent, showing obvious eccentricity; based on numerical simulation research, it was found that the pressure peak and damage level of the rock mass on the coupled side of the eccentric uncoupled charge were higher than those on the uncoupled side, and the damage level of the rock near the hole wall, like the pressure peak, has an eccentric distribution due to the influence of the uncoupling coefficient. Compared with the research progress of experiments and numerical simulations, theoretical analysis lags behind due to the complexity and variability of actual blasting projects. Most of the existing theoretical analytical formulas for the initial and extended radius of cracks caused by eccentric uncoupled charge blasting of rocks believe that cracks are only generated under the action of circumferential stress.

[0004] The studies on rock cracking caused by eccentric uncoupled charge blasting have only considered the limitation of single stress action, and the research on the characteristics of blasting damage distribution is slightly insufficient.

[0005] Therefore, how to construct a rock fracturing assessment method for eccentric uncoupled charge blasting is a problem that needs to be solved urgently. Summary of the invention

[0006] According to the embodiments of the present application, a scheme for evaluating rock fracturing caused by eccentric uncoupled charge blasting is provided, which can take into account the combined effects of radial compressive stress and annular tensile stress in the process of rock blasting crushing and cracking, and then derive the expansion range of rock cracks caused by eccentric uncoupled charge blasting; can reveal the fracturing mechanism of rock blasting under the eccentric uncoupled charge structure; can effectively evaluate the eccentric distribution range of rock blasting fracturing, and provide theoretical guidance for the design of blasthole schemes.

[0007] In a first aspect of the present application, a method for evaluating rock fracturing caused by eccentric uncoupled charge blasting is provided. The method comprises:

[0008] Obtain working condition parameters;

[0009] The operating condition parameters are input into the constructed eccentric uncoupled charge blasting cracking assessment model to obtain the crack eccentricity distribution range;

[0010] The eccentric uncoupled charge blasting cracking assessment model can be constructed in the following way:

[0011] Obtain the initial pressure at each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface;

[0012] Based on the stress characteristic conditions on the failure conjugate surface and the initial pressure, the radius of the crushing zone at each point on the hole wall is calculated;

[0013] Based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and annular stress characteristics of the rupture zone, an evaluation model for blasting fracturing caused by eccentric uncoupled charge was constructed.

[0014] Furthermore, the operating parameters include:

[0015] Hole radius, charge radius, distance between the center of the explosive and the uncoupled side point on the hole wall, angle between the line connecting the uncoupled side point on the hole wall and the center of the blasthole and the plumb line, rock density, explosive density, detonation velocity, expansion heat index and / or longitudinal wave velocity.

[0016] Furthermore, obtaining the initial pressure of each point on the rock blasting hole wall includes:

[0017] Get the concentric uncoupling coefficient;

[0018] Based on the concentric uncoupling coefficient, calculating an equivalent eccentric uncoupling coefficient;

[0019] Based on the equivalent eccentric uncoupling coefficient, the initial pressure at each point on the rock blasting hole wall is calculated.

[0020] Furthermore, the calculation of the initial pressure at each point on the rock blasting hole wall based on the equivalent eccentric uncoupling coefficient includes:

[0021]

[0022] Among them, K M is the equivalent eccentric uncoupling coefficient;

[0023] R1 is the radius of the blast hole;

[0024] R2 is the radius of the medicine roll;

[0025] is the distance between the explosive center point O1 and the uncoupled side point M on the hole wall;

[0026] θ is the angle between the line connecting the uncoupled side point M on the hole wall and the blasthole center point O and the plumb line;

[0027] p M is the pressure at point M;

[0028] ρ0 is the density of explosive;

[0029] γ0 is the expansion heat index;

[0030] D e is the detonation velocity;

[0031] l z is the axial charge coefficient.

[0032] Furthermore, the calculation of the radius of the crushing zone at each point on the hole wall based on the stress characteristic condition on the failure conjugate surface and the initial pressure includes:

[0033]

[0034] in, The outer boundary radius of the crushing area at displacement point M;

[0035] l z is the axial charge coefficient;

[0036] n is the pressure increase coefficient of the pore wall;

[0037] ξ is a constant, which can be expressed as:

[0038]

[0039] in, is the internal friction angle of rock;

[0040] c is the rock cohesion;

[0041] b is the lateral pressure coefficient;

[0042] α is the decay exponent.

[0043] Furthermore, the construction of the eccentric uncoupled charge blasting fracture assessment model based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and hoop stress characteristics of the fracture zone includes:

[0044]

[0045] in, and are the outer boundary radii of the rupture zone at point B on the wall of the eccentric uncoupled charge blasthole and at any point M except point B;

[0046] and They are the outer boundary radius of the crushing zone at point B on the wall of the eccentric uncoupled charge blasthole and any point M except point B;

[0047] λ is a constant.

[0048] Furthermore, the λ can be determined by:

[0049]

[0050] Among them, σ td is the dynamic tensile strength of rock.

[0051] In a second aspect of the present application, a device for evaluating rock fracturing caused by eccentric uncoupled charge blasting is provided. The device comprises:

[0052] An acquisition module is used to obtain working condition parameters;

[0053] A calculation module is used to input the working condition parameters into the constructed eccentric uncoupled charge blasting cracking assessment model to obtain the eccentric distribution range of the cracks;

[0054] The eccentric uncoupled charge blasting cracking assessment model can be constructed in the following way:

[0055] Obtain the initial pressure at each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface;

[0056] Based on the stress characteristic conditions on the failure conjugate surface and the initial pressure, the radius of the crushing zone at each point on the hole wall is calculated;

[0057] Based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and annular stress characteristics of the rupture zone, an evaluation model for blasting fracturing caused by eccentric uncoupled charge was constructed.

[0058] In a third aspect of the present application, an electronic device is provided, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, the method described above is implemented.

[0059] In a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method according to the first aspect of the present application is implemented.

[0060] The rock eccentric uncoupled charge blasting fracturing assessment method provided in the embodiment of the present application obtains operating condition parameters; inputs the operating condition parameters into the constructed eccentric uncoupled charge blasting fracturing assessment model to obtain the eccentric distribution range of the cracks; wherein the eccentric uncoupled charge blasting fracturing assessment model can be constructed in the following manner: obtain the initial pressure of each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface; calculate the radius of the crushing zone of each point on the hole wall based on the stress characteristic conditions on the failure conjugate surface and the initial pressure; construct an eccentric uncoupled charge blasting fracturing assessment model based on the crushing zone radius of each point on the hole wall and the obtained radial stress and annular stress characteristics of the rupture zone, which can reveal the fracturing mechanism of rock blasting under the eccentric uncoupled charge structure; can effectively evaluate the eccentric distribution range of rock blasting fracturing, and provide theoretical guidance for the design of blasthole schemes.

[0061] It should be understood that the contents described in the Summary of the Invention are not intended to limit the key or important features of the embodiments of the present application, nor are they intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0063] Figure 1 It is a flow chart of a method for evaluating rock fracturing caused by eccentric uncoupled charge blasting according to an embodiment of the present application;

[0064] Figure 2 A flow chart of establishing an eccentric uncoupled charge blasting fracturing assessment model according to an embodiment of the present application;

[0065] Figure 3 is a schematic diagram of an eccentric uncoupled charge structure according to an embodiment of the present application;

[0066] Figure 4 is a schematic diagram of a computing unit according to an embodiment of the present application;

[0067] Figure 5 It is a schematic diagram of the scope of rock fissures blasted by eccentric uncoupled charge at different charge roll diameters according to an embodiment of the present application;

[0068] Figure 6 It is a schematic diagram comparing the crack radius results at 270° and 90° directions under different medicine roll diameters according to the embodiment of the present application;

[0069] Figure 7 is a block diagram of a rock eccentric uncoupled charge blasting fracture assessment device according to an embodiment of the present application;

[0070] Figure 8 It is a schematic diagram of the structure of a terminal device or a server suitable for implementing the embodiments of the present application. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0072] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0073] Figure 1 A flow chart of a method for evaluating rock fracturing caused by eccentric uncoupled charge blasting according to an embodiment of the present disclosure is shown. The method comprises:

[0074] S110, obtaining operating condition parameters.

[0075] In some embodiments, the working condition parameters can be obtained through on-site construction data, historical data and / or big data analysis, including the blasthole radius R1, the cartridge radius R2, the distance R between the explosive center point O1 and the uncoupled side point M on the hole wall, MO1 , the angle θ between the line connecting the uncoupled side point M on the hole wall and the center point O of the blasthole and the plumb line, rock density ρ, explosive density ρ0, detonation velocity D e , thermal expansion index γ0, longitudinal wave velocity C p 、Charge length l c , blasthole length l b , the pressure increase coefficient n of the pore wall, the attenuation index α, the static Poisson's ratio μ of the rock, the rock cohesion c and / or the internal friction angle φ of the rock.

[0076] S120, inputting the operating condition parameters into the constructed eccentric uncoupled charge blasting fracture assessment model to obtain the eccentric distribution range of the fracture.

[0077] In some embodiments, Figure 2 As shown in the figure, the blasting cracking assessment model of eccentric uncoupled charge can be constructed in the following way:

[0078] S210, obtaining the initial pressure at each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface.

[0079] Among them, the stress characteristic conditions on the failure conjugate surface can be obtained through historical data, on-site construction drawings, etc., which will not be elaborated here.

[0080] In some embodiments, the initial pressure at each point of the rock blasting hole wall can be calculated as follows:

[0081] The uncoupling coefficient of the concentric uncoupled charge is defined as K:

[0082]

[0083] Among them, R1 is the radius of the blast hole;

[0084] R2 is the radius of the medicine coil.

[0085] When eccentric uncoupled charge is used, based on the definition of concentric uncoupled coefficient K, the equivalent eccentric uncoupled coefficient of point M on the uncoupled side of the borehole wall can be derived as follows:

[0086]

[0087] Among them, K M is the eccentric uncoupling coefficient of point M on the uncoupling side of the hole wall;

[0088] It is the distance between the center of the explosive point O1 and the uncoupled side point M on the hole wall.

[0089] With the help of the geometric relationship of the blasthole charge, the eccentric uncoupling coefficient of the uncoupled point M on the hole wall can be further expressed as:

[0090]

[0091] Among them, θ is the angle between the line connecting the uncoupled side point M on the hole wall and the center point O of the blasthole and the plumb line.

[0092] For point B on the coupling side of the hole wall, the hole wall pressure calculation formula for the coupling charge is as follows:

[0093]

[0094] Among them, p and p0 are the shock wave and explosive detonation pressures respectively;

[0095] ρ and ρ0 are the densities of rock and explosive, respectively;

[0096] D e is the detonation velocity;

[0097] γ0 is the expansion heat index;

[0098] C p is the longitudinal wave velocity.

[0099] The calculation formula for the initial pressure of the hole wall of concentric uncoupled charge is:

[0100]

[0101] Among them, l z is the axial charge coefficient;

[0102] l z = l c / l b , l c is the charge length, l b is the length of the blast hole;

[0103] n is the pressure increase coefficient of the pore wall.

[0104] From this, the pressure calculation formula for any point M on the wall of the eccentric uncoupled charge blasthole except point B is as follows:

[0105]

[0106] p M is the pressure at point M.

[0107] S220, calculating the radius of the crushing zone at each point on the hole wall based on the stress characteristic conditions on the failure conjugate surface and the initial pressure.

[0108] In some embodiments, the stress at any calculation point in rock blasting engineering can be expressed as:

[0109]

[0110] σ θ =-bσ r

[0111] Among them, σ r and σ θ are the radial and hoop stresses at any calculation point, respectively;

[0112] is the proportional distance, Where r is the point distance;

[0113] α is the decay exponent;

[0114] b is the lateral pressure coefficient, b = μ d / (1-μ d ); μ d is the dynamic Poisson's ratio.

[0115] It should be noted that within the loading frequency range of engineering blasting, μ d=0.8μ, μ is the static Poisson's ratio of rock.

[0116] Considering the radial compressive stress σ in the rock failure process r and hoop tensile stress σ θ The combined effect of , the stress equation on the failure conjugate surface can be calculated as:

[0117]

[0118] Among them, σ and τ are the normal stress and shear stress on the failure conjugate plane, respectively;

[0119] β is the angle between the two sets of conjugate planes generated when the rock mass is destroyed.

[0120] When the rock mass is blasted, the stress condition τ≥σtanφ+c is satisfied on the conjugate surface of the destruction. Substituting the stress equation on the conjugate surface of the destruction into its stress condition, we can obtain:

[0121]

[0122] Where c is the rock cohesion;

[0123] φ is the internal friction angle of rock.

[0124] Based on the above stress equation on the failure conjugate surface, the following can be derived with respect to β:

[0125]

[0126] For the stress derivative equation on the failure conjugate surface, when its value is 0, the stress extreme value must be obtained. Therefore, when it is set to 0, we can get:

[0127]

[0128] According to the continuity condition of radial stress, the radius of the outer boundary of the crushing zone can be obtained as follows:

[0129]

[0130] Among them, R C is the outer boundary radius of the crushing area;

[0131] ξ is a constant, which can be expressed as:

[0132]

[0133] Using the above-mentioned calculation formula for the coupling charge hole wall pressure and the analytical formula for the crushing zone radius, the outer boundary radius of the crushing zone at point B on the coupling side can be expressed as follows:

[0134]

[0135] Among them, R B C is the outer boundary radius of the crushing zone at point B on the coupling side;

[0136] p and p0 are the shock wave and explosive detonation pressures, respectively;

[0137] ρ and ρ0 are the densities of rock and explosive, respectively;

[0138] D e is the detonation velocity;

[0139] γ0 is the expansion heat index;

[0140] C p is the longitudinal wave velocity.

[0141] Similarly, using the above-mentioned eccentric uncoupled charge hole wall pressure calculation formula and the crushing zone radius analytical formula, the outer boundary radius of the crushing zone at any point M on the eccentric uncoupled charge hole wall except point B can be expressed as follows:

[0142]

[0143] in, It is the outer boundary radius of the crushing zone of any point M except point B.

[0144] S230, constructing an eccentric uncoupled charge blasting fracture assessment model based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and annular stress characteristics of the fracture zone.

[0145] In some embodiments, the principal stress form based on the Moore-Coulomb criterion can be expressed as:

[0146]

[0147] Among them, σ r and σ θ are the radial and hoop stresses at any calculation point, respectively;

[0148] c is the rock cohesion;

[0149] φ is the internal friction angle of rock.

[0150] Based on the principal stress using the Mohr-Coulomb criterion, the hoop stress can be expressed as:

[0151]

[0152] In the present disclosure, an axisymmetric model is adopted, and its stress equilibrium differential equation can be expressed as follows:

[0153]

[0154] Further, we can get:

[0155]

[0156] Solving the above differential equation yields:

[0157]

[0158] Where C is the integral constant.

[0159] Assume that the radial pressure of rock on the interface between the crushing zone and the fracture zone is σ l , the circumferential stress on the interface can be obtained from the stress expression of any calculation point in rock blasting engineering:

[0160] σ θ =-bσ l

[0161] Furthermore, substituting the principal stress expression of the Moore-Coulomb criterion into the radial stress σ on the outer boundary of the crushing zone can be obtained: l for:

[0162]

[0163] Assume that the radius of the boundary between the crushing zone and the rupture zone is R s , the radial stress distribution in the rupture zone can be solved as:

[0164]

[0165] in, is the distribution equation of radial stress in the rupture zone.

[0166] Furthermore, the stress distribution equation in the rupture zone is obtained as:

[0167]

[0168] in, is the distribution equation of the hoop stress in the rupture zone.

[0169] The rupture zone is defined as the loss of annular bearing capacity, and its characteristic is that radial cracks continue to expand along this area. The distribution equation of radial stress in the rupture zone is derived with respect to r:

[0170]

[0171] From the above formula, we can know that the radial stress σ r It is negatively correlated with the calculated radius, indicating that when the radial stress is 0, the stress influence range is the outer boundary radius of the crushing zone. Since the magnitude of the hoop stress increases with the increase of the calculated radius, when the hoop stress σ θ Equal to the dynamic tensile strength of rock σ tdWhen σ is σ, the rock in the fracture zone loses its annular bearing capacity. If the calculated radius continues to increase, the rock begins to have annular bearing energy. At this time, the calculated radius is the outer boundary radius of the fracture zone. θ =-σ td Substituting the distribution equation of the hoop stress in the rupture zone into the equation, we can obtain:

[0172] R F =λR C

[0173] Among them, R F is the outer boundary radius of the crushing area;

[0174] λ is a constant, which can be expressed as:

[0175]

[0176] Furthermore, the outer boundary radius of the eccentric uncoupled charge rupture zone can be obtained as:

[0177]

[0178] in, and are the outer boundary radii of the rupture zone at point B on the wall of the eccentric uncoupled charge blasthole and at any point M except point B;

[0179] and They are respectively the outer boundary radii of the crushing zone at point B on the hole wall of the eccentric uncoupled charge gunhole and any point M except point B.

[0180] In some embodiments, the operating parameters obtained in step S110 are input into a constructed eccentric uncoupled charge blasting fracture assessment model to obtain the eccentric distribution range of the fractures.

[0181] The following is a further description of the embodiments of the present disclosure by way of diagrams:

[0182] like Figure 3 As shown, in the present disclosure, when there is a gap between the charge roll and the blasthole, the center of the charge roll deviates from the center of the blasthole due to gravity, thereby generating an eccentricity phenomenon for the uncoupled charge structure. There is an obvious deviation between the center of the charge roll O1 and the center of the blasthole O. The coupled side of the blasthole is considered to be near point B, and only point B is in a coupled state, while all other points on the blasthole are in an uncoupled state, and the degree of uncoupling at each point varies with the distance between the charge roll and the hole wall.

[0183] like Figure 4 As shown, in this embodiment, the hoop stress σ is further considered on the basis of the traditional model (a). θ That is, considering the radial compressive stress σ in the rock failure process r and hoop tensile stress σθ The combined effect of the stress direction is defined as compression as positive and tension as negative, and the following is obtained: Figure 4 (b) shows the new model. Where β is the angle between the two sets of conjugate planes generated when the rock mass fails.

[0184] like Figure 5 As shown in FIG. 1 , the fracture range of rock blasting by eccentric uncoupled charge when the diameter of the charge roll is 20 mm, 30 mm and 40 mm respectively in this embodiment; Figure 5 It can be seen that the explosive detonation pressure on the coupled side of the charge is the largest, resulting in the largest crack range; while the explosive detonation pressure on the uncoupled side of the charge is the smallest, and correspondingly the crack range is the smallest.

[0185] like Figure 6 As shown in FIG. 1 , the crack radius results at 270° and 90° directions are compared when the diameters of the medicine rolls are 20 mm, 30 mm and 40 mm respectively in this embodiment; Figure 6 It can be seen that the uncoupling coefficient used in the coupled side rock mass (i.e., the 270° direction) is constant at 1, resulting in a constant fracture radius; for the uncoupled side rock mass (i.e., the 90° direction), the fracture radius increases due to the decrease in the uncoupling coefficient.

[0186] According to the embodiments of the present disclosure, the following technical effects are achieved:

[0187] In the process of rock blasting crushing and cracking, the combined effect of radial compressive stress and annular tensile stress is considered, and then the expansion range of rock cracks blasted by eccentric uncoupled charge is derived; it can reveal the cracking mechanism of rock blasting under the eccentric uncoupled charge structure; it can effectively evaluate the eccentric distribution range of rock blasting cracking, and provide theoretical guidance for the design of blasthole scheme.

[0188] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0189] The above is an introduction to the method embodiment. The following is a further explanation of the scheme described in this application through an apparatus embodiment.

[0190] Figure 7 A block diagram 700 of a rock eccentric uncoupled charge blasting fracture assessment device according to an embodiment of the present application is shown. Figure 7 Shown include:

[0191] An acquisition module 710 is used to acquire operating condition parameters;

[0192] A calculation module 720 is used to input the operating condition parameters into the constructed eccentric uncoupled charge blasting cracking assessment model to obtain the eccentric distribution range of the cracks;

[0193] The eccentric uncoupled charge blasting cracking assessment model can be constructed in the following way:

[0194] Obtain the initial pressure at each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface;

[0195] Based on the stress characteristic conditions on the failure conjugate surface and the initial pressure, the radius of the crushing zone at each point on the hole wall is calculated;

[0196] Based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and annular stress characteristics of the rupture zone, an evaluation model for blasting fracturing caused by eccentric uncoupled charge was constructed.

[0197] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described module can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0198] Figure 8 A schematic diagram of the structure of a terminal device or server suitable for implementing an embodiment of the present application is shown.

[0199] like Figure 8 As shown, the terminal device or server includes a central processing unit (CPU) 801, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 802 or the program loaded from the storage part 808 into the random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the terminal device or server are also stored. CPU801, ROM 702 and RAM803 are connected to each other through a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0200] The following components are connected to the I / O interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the I / O interface 805 as needed. A removable medium 811, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 810 as needed, so that a computer program read therefrom is installed into the storage section 808 as needed.

[0201] In particular, according to an embodiment of the present application, the above method flow steps can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a machine-readable medium, and the computer program includes a program code for executing the method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 809, and / or installed from the removable medium 811. When the computer program is executed by the central processing unit (CPU) 801, the above-mentioned functions defined in the system of the present application are executed.

[0202] It should be noted that the computer-readable medium shown in the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0203] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of the code, and the aforementioned module, program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0204] The units or modules involved in the embodiments described in the present application may be implemented by software or hardware. The units or modules described may also be arranged in a processor. The names of these units or modules do not, in some cases, constitute limitations on the units or modules themselves.

[0205] As another aspect, the present application further provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable storage medium stores one or more programs, and when the above programs are used by one or more processors to execute the method described in the present application.

[0206] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned application concept. For example, the above features are replaced with (but not limited to) technical features with similar functions applied in the present application.

Claims

1. A method for evaluating rock cracking caused by eccentric uncoupled charge blasting, characterized in that: include: Obtain working condition parameters; The operating condition parameters are input into the constructed eccentric uncoupled charge blasting cracking assessment model to obtain the crack eccentricity distribution range; The eccentric uncoupled charge blasting cracking assessment model can be constructed in the following way: Obtain the initial pressure at each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface; Based on the stress characteristic conditions on the failure conjugate surface and the initial pressure, the radius of the crushing zone at each point on the hole wall is calculated; Based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and annular stress characteristics of the rupture zone, an evaluation model for blasting fracturing caused by eccentric uncoupled charge was constructed.

2. The method according to claim 1, characterized in that The operating parameters include: Hole radius, charge radius, distance between the center of the explosive and the uncoupled side point on the hole wall, angle between the line connecting the uncoupled side point on the hole wall and the center of the blasthole and the plumb line, rock density, explosive density, detonation velocity, expansion heat index and / or longitudinal wave velocity.

3. The method according to claim 1, characterized in that The method of obtaining the initial pressure of each point on the rock blasting hole wall comprises: Get the concentric uncoupling coefficient; Based on the concentric uncoupling coefficient, calculating an equivalent eccentric uncoupling coefficient; Based on the equivalent eccentric uncoupling coefficient, the initial pressure at each point on the rock blasting hole wall is calculated.

4. The method according to claim 3, characterized in that: The calculation of the initial pressure at each point of the rock blasting hole wall based on the equivalent eccentric uncoupling coefficient includes: Among them, K M is the equivalent eccentric uncoupling coefficient; R1 is the blasthole radius; R2 is the radius of the medicine roll; is the distance between the explosive center point O1 and the uncoupled side point M on the hole wall; θ is the angle between the line connecting the uncoupled side point M on the hole wall and the blasthole center point O and the plumb line; p M is the pressure at point M; ρ0 is the density of explosive; γ0 is the expansion heat index; D e is the detonation velocity; l z is the axial charge coefficient.

5. The method according to claim 4, characterized in that The calculation of the radius of the crushing zone at each point on the hole wall based on the stress characteristic condition on the failure conjugate surface and the initial pressure includes: in, The outer boundary radius of the crushing area at displacement point M; l z is the axial charge coefficient; n is the pressure increase coefficient of the pore wall; ξ is a constant, which can be expressed as: in, is the internal friction angle of rock; c is the rock cohesion; b is the lateral pressure coefficient; α is the decay exponent.

6. The method according to claim 5, characterized in that The construction of the eccentric uncoupled charge blasting fracture assessment model based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and hoop stress characteristics of the fracture zone includes: in, and are the outer boundary radii of the rupture zone at point B on the wall of the eccentric uncoupled charge blasthole and at any point M except point B; and They are the outer boundary radius of the crushing zone at point B on the wall of the eccentric uncoupled charge blasthole and any point M except point B; λ is a constant.

7. The method according to claim 6, characterized in that The λ can be determined as follows: Among them, σ td is the dynamic tensile strength of rock.

8. A rock eccentric uncoupled charge blasting fracture assessment device, characterized in that: include: An acquisition module is used to obtain operating condition parameters; A calculation module is used to input the working condition parameters into the constructed eccentric uncoupled charge blasting cracking assessment model to obtain the eccentric distribution range of the cracks; The eccentric uncoupled charge blasting cracking assessment model can be constructed in the following way: Obtain the initial pressure at each point on the rock blasting hole wall and the stress characteristic conditions on the failure conjugate surface; Based on the stress characteristic conditions on the failure conjugate surface and the initial pressure, the radius of the crushing zone at each point on the hole wall is calculated; Based on the radius of the crushing zone at each point on the hole wall and the acquired radial stress and annular stress characteristics of the rupture zone, an evaluation model for blasting fracturing caused by eccentric uncoupled charge was constructed.

9. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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