87 results about "Detonation velocity" patented technology

The invention discloses a preparation method of a CoCrNi medium-entropy alloy and Q235B steel explosive welding composite board, which comprises the following steps of: annealing a CoCrNi medium-entropy alloy board, sequentially laying sandy soil, an anvil, a Q235B hot-rolled steel plate, a support column, a medium-entropy alloy board, kraft paper and explosive from bottom to top on an explosion field, and performing explosive welding to obtain the CoCrNi medium-entropy alloy and Q235B steel explosive welding composite board. The detonation velocity of the explosive ranges from 2500 m / s to 3000 m / s, and the brisance of the explosive ranges from 18 mm to 22 mm. According to the method, metallurgical bonding of the CoCrNi medium entropy alloy and the Q235B steel plate is achieved, the interface bonding rate of the obtained composite plate is larger than 99.2%, the yield strength is larger than 420 MPa, the tensile strength is larger than 500 MPa, the percentage elongation after fracture is larger than 35%, and the interface shear strength is larger than 200 MPa. The method is simple in process and suitable for industrial production.

The invention discloses a process for preparing a high-strength and high-toughness metal material with a multi-scale gradient composite structure through explosive processing, and relates to the field of high-strength and high-toughness metal material processes, the process comprises the following steps: 1, preparing a sand base, a base plate, a cover plate and an explosive, and polishing the outer surfaces of the base plate and the cover plate; the supporting object is placed at the top end of the base plate, the covering plate is placed at the top end of the supporting object, the explosive is placed on the covering plate, and the composite plate with a good metallurgical bonding interface can still be prepared by adjusting the detonation velocity of the explosive and the interval between the plates under the conditions that the tensile strength of the base plate of the welding plate reaches up to 1.4 GPa and the fracture strain of the covering plate is higher than 25%. In addition, by increasing the detonation velocity, the composite plate material is subjected to surface hardening, a grain size gradient layer is generated on the surface of the material, the explosive hardening and explosive welding machining processes are optimized, and meanwhile one-time forming of machining of the high-strength multi-scale gradient structure composite metal plate is achieved.

The invention discloses an on-site mixed water-gel explosive which comprises the following components in percentage by weight: 45-70% of ammonium nitrate; 9%-15% of water; 10-20% of calcium nitrate; 7-20% of liquid fuel; 0-10% of an auxiliary combustible agent; 0.7%-1.0% of a gelling agent; 0.2%-0.5% of an additive; 0.02%-8% of a sensitizing agent; 1-3% of a cross-linking agent; the density range of the explosive is 0.3-1.25 g / cm < 3 >, and the adjusting range is wide; the detonation velocity of the explosive is 2000-4500 m / s, and the explosive is high in matching degree with medium soft rock; the explosive has good water resistance and is suitable for charging of wet holes, water holes and slurry holes; the production raw materials of the explosive do not contain high-energy materials, and the prepared thickening mother liquor and semi-finished products have the characteristics of good stability, long storage life, high transportation safety and high intrinsic safety.

The invention relates to the technical field of explosive welding methods for composite plates, in particular to an explosive welding compounding method for a silver-steel composite plate. The method comprises the following steps that firstly, the surfaces of a silver plate and a steel plate are subjected to polishing treatment and film pasting protection; 2, a novel explosive is adopted, and explosive parameters are determined, specifically, the detonation velocity ranges from 1700 m / s to 1800 m / s, the brisance ranges from 6.5 mm to 6.8 mm, and the unit dosage ranges from 12 kg / m < 2 > to 15 kg / m < 2 >; and the optimal explosive welding distance is determined, wherein the height of the distance between the silver plate and the steel plate is 4-8 mm. According to the prepared silver-steel composite plate, effective metallurgical bonding of the silver plate and the steel plate is achieved, the bonding strength is far higher than that of other composite methods such as explosive welding, the defects of breakdown, wrinkling, tearing, jet flow accumulation and the like generated by a conventional welding method are effectively overcome, and meanwhile the phenomenon that the mechanical property does not reach the standard is avoided. Compared with other composite methods, the explosive welding process has the advantages that common calcium carbonate and bran are added and mixed with the explosive, low detonation velocity and appropriate brisance are obtained, the content of the explosive is reduced, and the cost is low.

The invention discloses a method for rapidly judging the sensitization effect of an on-site mixed emulsion explosive. The method comprises the following steps: S1, a laboratory calibration stage: simulating an on-site sensitization process to prepare a calibrated explosive sample; the sampling device collects and calibrates explosive samples, the millimeter graduated scale is arranged above the sampling device, and the camera shoots and counts the number of bubbles; detecting the density and the detonation velocity, and establishing an incidence relation of bubble number-density-detonation velocity in the specified millimeter scale and a qualified range; s2, an on-site detection stage: calibrating a millimeter graduated scale, camera equipment and a sampling device which are consistent in specification in a laboratory; the sampling device collects an on-site explosive sample, the graduated scale is arranged above the sampling device, the camera shoots and counts the number of bubbles, and the sensitization quality is judged by comparing with a laboratory calibration association relationship. According to the invention, the problems of long detection period of a traditional laboratory, strong subjectivity of existing field detection and high requirement on professional level of detection personnel can be solved, and real-time, accurate and low-cost detection of field sensitization quality is realized.

The invention relates to the technical field of blasting, and discloses a rock mass longitudinal wave velocity inversion method based on blast hole detonation velocity measurement, which comprises the following steps: drilling a blast hole; explosive and a monitoring probe of monitoring equipment are arranged in the blast hole; detonating the explosive, monitoring and outputting a curve chart that the propagation distance of the detonation wave changes along with the propagation time through monitoring equipment, the longitudinal coordinate of the curve chart being the propagation distance of the detonation wave, and the horizontal coordinate of the curve chart being the propagation time of the detonation wave; according to the distribution condition of each rock stratum in the blast hole, the curve graph is divided into a plurality of curve segments, and each curve segment corresponds to the propagation process of detonation waves in the corresponding rock stratum; the slope of each curve section is calculated, and actually measured explosive detonation velocities of different rock stratums are obtained; and substituting the actually measured explosive detonation velocity into the theoretical formula of the explosive detonation velocity and the longitudinal wave velocity of the rock, and inverting the longitudinal wave velocity of the corresponding rock stratum. Through the inversion method provided by the invention, detonation wave monitoring and longitudinal wave velocity inversion of different rock stratums through which the blast hole passes can be completed through one-time blasting.

The utility model discloses a device for detecting the detonation velocity of on-site mixed emulsion explosive in a blast hole, and particularly relates to the technical field of explosive detonation velocity detection, the device comprises a first positioning ring and a second positioning ring, the two positioning rings with semi-ring structures are hinged through a rotating roller hinge and can be accurately positioned around the blast hole, a stable foundation is provided for explosive detonation velocity detection, and the explosive detonation velocity detection efficiency is improved. The first positioning ring is provided with a needle inlet hole, the second positioning ring is provided with a needle outlet hole, the axes of the two holes coincide, the aperture ratio of the two holes is three to one, a clear penetrating path is provided for a steel needle, and the detection precision is improved. A plurality of guide plates are encircled to form a cylindrical structure, so that the steel needle can be guided and subjected to posture control from different directions, the steel needle is ensured to advance along the axis, the device can adapt to steel needles with different diameters, the universality of the device is improved, the device is simple to mount and operate, and the assembly for measuring the detonation velocity of the emulsion explosive can be quickly completed.

The invention relates to a low-detonation-velocity emulsion explosive charging machine which comprises a conveying mechanism used for conveying low-detonation-velocity emulsion explosives in the explosive charging process, and a filling mechanism, an explosive coating mechanism, an assembling mechanism and a detecting mechanism which are sequentially arranged in the conveying direction of the conveying mechanism. The explosive coating mechanism is used for coating an explosive which can change color when encountering water outside an explosive body, the assembling mechanism is used for sequentially assembling a supporting part and an outer diaphragm outside the explosive body to form a low-detonation-velocity emulsion explosive, and the detecting mechanism is used for detecting the outer diaphragm; the invention further provides an explosive charging method based on the low-detonation-velocity emulsion explosive charging machine. The explosive charging method comprises a filling procedure, an explosive coating procedure, an assembling procedure and a detecting procedure. The problems that in the charging process of an existing emulsion explosive product, the surface detection efficiency is low, the accuracy is poor, damage which is not easy to perceive is prone to occurring in the actual using process, and the blasting safety and effect are affected are solved.

A munition has an explosive charge with direction explosive characteristics, such as a nonuniform detonation velocities. The explosive charge may have multiple portions of explosives with nonuniform characteristics, and / or may have portions with graded nonuniform characteristics. The explosive charge may be used to propel a material from the munition in a desired manner. For example the material may be fragments that are part of a fragmentation munition. Alternatively the material may be a layer of a material, such as a metal, that produces an explosively formed penetrator or shaped charge. The explosive charge may be configured to control the spread and / or direction of the material to be propelled from the munition.

The invention relates to a non-temperature-balanced aluminum-containing explosive detonation parameter calculation method, belongs to the technical field of detonation parameter calculation, and solves the problems of complexity and inaccurate result of a calculation method in the prior art. The method comprises the following steps: supposing detonation pressure, and calculating the aluminum powder temperature based on the supposed detonation pressure; supposing the detonation temperature, and calculating the internal energy variation of the detonation product based on the supposed detonation pressure, the supposed detonation temperature and the aluminum powder temperature; based on the assumed detonation pressure, the assumed detonation temperature and the detonation product internal energy variable quantity, judging whether the assumed detonation pressure and the assumed detonation temperature meet the detonation Rayleigh-Newton relationship or not, and if not, returning to the step of calculating the detonation product internal energy variable quantity based on the assumed detonation pressure, the assumed detonation temperature and the aluminum powder temperature; if not, the detonation velocity is calculated based on the assumed detonation pressure, if the detonation velocity converges, the current assumed detonation pressure, the assumed detonation temperature and the detonation velocity are determined detonation parameters, and if not, the step of calculating the aluminum powder temperature based on the assumed detonation pressure is executed again. And rapid and accurate detonation parameter determination of the aluminum-containing explosive is realized.

This invention discloses a research and testing method for detonation velocity tubes, comprising the following steps: Step 1, point setting; Step 2, point connection; Step 3, influence determination; Step 4, numerical judgment. This invention, by improving the data reading points of the detonation velocity tube and reducing the difference in the sampling test system, comprehensively verifies the detonation velocity test and uses two or more data points to cross-reference the validity of the detonation velocity value. If the data from two points far from the detonating bomb are significantly greater than the values ​​from two adjacent points, the first set of values ​​can be considered significantly affected by the detonating bomb, and this set of data is invalid. If the difference between the values ​​from the second and third sets of data points is less than 200 m / s, it can be considered a valid detonation velocity. If the difference between two adjacent sets of data is large, it can be considered that the explosive stability is insufficient. This method is beneficial for fundamentally solving the evaluation of explosive raw material performance and simultaneously reducing the significant error brought by the detonation velocity of the detonator to the detonation velocity measurement, effectively evaluating the performance and stability of explosives.

This application discloses a method for obtaining the detonation velocity and detonation pressure of energetic materials based on atomic-scale dynamics, relating to the field of materials science and technology. The method includes: acquiring an initial configuration file of the energetic material to be tested, and performing dynamic processing on the initial configuration file using a materials simulation model to generate a first training dataset; iteratively training the potential function using the first training dataset to obtain a structure file corresponding to each generation of training; sampling and screening the structure files, and calculating the accuracy adjustment parameters corresponding to the sampled and screened structure files using first-principles calculation software; adjusting the parameters of the materials simulation model using the accuracy adjustment parameters, and using the adjusted materials simulation model to generate a second training dataset from the structure files obtained from each generation of training and the first training dataset; and predicting the performance of the energetic material to be tested based on the potential function trained on the second training dataset. A general method for predicting material properties that balances accuracy and efficiency is proposed.

The invention discloses a novel explosive with high detonation velocity. The novel explosive comprises the following components in parts by weight: 4-8 parts of perchlorate, 0-4 parts of nitrate and 3-7 parts of a reduced water-soluble organic solvent. The invention further discloses a preparation method of the novel explosive with the high detonation velocity and a primer with the novel explosive as a main explosive. The adopted raw materials are high in safety and wide in source, and compared with traditional ladder type and black ladder type detonators, the production safety risk can be remarkably reduced, and the stability of a raw material supply chain is improved.

The application discloses on-site mixed emulsion explosive and application thereof in smooth blasting, and the on-site mixed emulsion explosive contains the following raw materials in parts by weight: 60-80 parts of ammonium nitrate, 5-10 parts of sodium nitrate, 12-18 parts of water, 6-7 parts of mixed oil phase, 0.4-0.9 parts of sensitizer, 0.2-0.5 parts of accelerator, 5-12 parts of calcium chloride and 4-8 parts of sodium sulfate; the method steps of the application of the on-site mixed emulsion explosive in the smooth blasting are as follows: S1, arrangement of auxiliary holes, slotting holes, caving holes and peripheral holes; S2, on-site filling of the on-site mixed emulsion explosive is sequentially carried out on the auxiliary holes, the slotting holes, the caving holes and the peripheral holes by an on-site mixing vehicle, and a blasting network is formed; and S3, blasting construction is carried out in a delay segmented detonation mode. In the on-site mixed emulsion explosive, the detonation velocity regulator is mixed more uniformly, more detonation gas can be generated, and the crack propagation effect of a blast hole is improved.

A munition has an explosive charge with direction explosive characteristics, such as a nonuniform detonation velocities. The explosive charge may have multiple portions of explosives with nonuniform characteristics, and / or may have portions with graded nonuniform characteristics. The explosive charge may be used to propel a material from the munition in a desired manner. For example the material may be fragments that are part of a fragmentation munition. Alternatively the material may be a layer of a material, such as a metal, that produces an explosively formed penetrator or shaped charge. The explosive charge may be configured to control the spread and / or direction of the material to be propelled from the munition.

The invention provides a method for determining the detonation speed of an explosive used for tunnel caving blasting by considering the influence of ground stress, and belongs to the technical field of blasting engineering and rock mass mechanics. Comprising the steps of obtaining rock mass mechanical parameters, blasting parameters and crustal stress data; establishing a stress analysis model based on ground stress and a blasting design drawing; establishing a crustal stress redistribution model caused by a cut cavity in the model, calculating radial pressure stress generated by crustal stress redistribution among the caving holes, and drawing a polar coordinate graph; establishing a collapse inter-hole explosion stress superposition model, and calculating circumferential tensile stress generated by explosion at the central points of the two holes; and based on the dynamic tensile strength and stress state of the rock, establishing a strength criterion for forming the inter-hole through crack, and deducing and solving the minimum explosive detonation speed required by the criterion. The blasting joint forming quality is effectively improved, back break is controlled, surrounding rock damage is reduced, and the safety, economical efficiency and reliability of blasting engineering are improved.

The invention discloses a stepped graded explosive filling method for roadway tunneling, which comprises the following steps: before blasting construction, according to the material parameter difference and the detonation velocity difference of adjacent charging sections in a stepped charging structure, measuring the reflection intensity and the energy transfer sequence of blast waves in blast holes one by one, and establishing an energy propagation trajectory diagram of each blast hole; and a boundary reflection response spectrogram is generated at the final position of the energy propagation trajectory. By constructing an energy propagation track and a coupling parameter scale chain and accurately regulating and controlling a charging structure and an energy release process, layered energy transfer and time sequence avoidance are realized, energy turn-back and advanced detonation are eliminated, vibration and overexcavation risks are remarkably reduced, the blasting efficiency, safety and construction controllability are improved, and a stable and adjustable energy balance closed loop is formed. According to the method, the tunneling crushing efficiency, the construction controllability and the field safety margin can be improved at the same time, and a quantifiable feedback basis is provided for closed-loop monitoring correction and engineering popularization.

The invention relates to a detonation velocity measurement system and method, in particular to a system and method for measuring the detonation velocity of an explosive through an energy-type demodulation femtosecond fiber grating, and solves the technical problem that an existing method is difficult to realize precise positioning of an explosion wave surface and long-distance detonation velocity measurement. The system comprises a broadband laser, a circulator, a sensing grating string, a photoelectric detector and a control unit, the control unit is used for controlling the broadband laser to emit an optical signal, the optical signal is transmitted to the input end of the sensing grating string through the first terminal and the second terminal of the circulator and enters the third terminal through the second terminal after being reflected by the sensing grating string, and the third terminal transmits the optical signal to the input end of the photoelectric detector; the photoelectric detector converts reflected optical signals into analog electric signals in real time and sends the analog electric signals to the control unit, and the control unit is used for processing the analog electric signals to obtain the explosive detonation velocity. According to the method, the error of the arrival time point of the explosive shock wave of the explosive can be controlled within 1%.

The invention discloses an inner salt type high-energy density insensitive explosive and a preparation method thereof, 9-amino-2, 6-dinitro-bis [1, 2, 4] triazolo [1, 3, 5] triazine, namely ZDTT, is prepared, and the ZDTT has the performance advantages of high energy density and insensitivity and also has the advantage of simple synthesis process; zDTT has a unique inner salt type condensed ring structure and is insoluble in water and conventional organic solvents. The ZDTT actual measurement density is 1.881 g.cm <-3 >, the detonation velocity is 8757 m.s <-1 >, the detonation pressure is 31.7 GPa, the initial thermal decomposition temperature is 330 DEG C, the impact sensitivity is larger than 40 J, the friction sensitivity is larger than 360 N, and the high-energy-density insensitive explosive has huge application potential in the field of high-energy-density insensitive explosives.

The application discloses a laser loading energetic material detonation velocity rapid prediction method and system, and belongs to the field of energetic material detonation performance detection. The application uses a pulse laser to interact with an energetic material to generate a shock wave, uses a single-point APD detector to record and store voltage changes of the APD, obtains an attenuation signal of the shock wave when the shock wave passes through a detection light beam, extracts interval time between a pulse signal and different height attenuation peaks from the energetic material surface, fits a time-position relationship through a corrected point explosion model, obtains corresponding shock wave characteristic velocity, establishes a linear regression relationship with a macroscopic detonation velocity, and realizes rapid prediction of the energetic material detonation velocity. The application only needs 5-10 mg of a sample, realizes extraction of the shock wave velocity of the energetic material through a single-point detector, obtains the shock wave characteristic velocity, linearly fits the shock wave velocity and a known detonation velocity, and predicts the energetic material detonation velocity. The application can improve the research and development efficiency of the energetic material and reduce the research and development cost.

The invention discloses a fused ring high-heat-resistance explosive and a preparation method thereof, the high-heat-resistance explosive is prepared by a one-pot method, and the fused ring high-heat-resistance explosive has the characteristics of one-step reaction, simple operation, mild conditions and high yield. The room temperature single crystal density of the TNBTP is 1.771 g / cm < 3 >, the TNBTP is insoluble in water and most common solvents, the initial thermal decomposition temperature is up to 388 DEG C, the thermal decomposition peak temperature is 397 DEG C, the actually measured impact sensitivity is 15J, and the friction sensitivity is 360N. The detonation velocity is calculated to be 7745 m / s, the detonation pressure is calculated to be 24.0 GPa, and the detonation velocity is tested to be 7617 m / s and the detonation pressure is tested to be 27.0 GPa by using a small-dose laser ablation method. The invention shows that the TNBTP has higher energy level and safety while having high heat resistance, the comprehensive performance of the TNBTP is superior to that of a typical heat-resistant explosive PYX, and the TNBTP is a high-heat-resistant explosive with great potential.

The invention discloses a hardened rock pavement blasting method, which comprises the following steps of: constructing a digital twin model through geological radar and three-dimensional laser scanning, and rehearsing a blasting effect and generating an initial parameter by utilizing an AI (artificial intelligence) algorithm; precise blasting is realized by adopting a sectional charging structure, and blasting vibration and dust diffusion are effectively controlled in combination with a 5G-TSN intelligent detonating network and a magnetorheological fluid shock insulation groove. Meanwhile, degradable dust suppression capsules are pre-embedded to suppress dust, modified emulsion explosives are adopted to reduce the detonation velocity, data are fed back to an AI system through three-dimensional point cloud scanning to be optimized, and the detonation efficiency and safety are improved.

The invention discloses a pyrazole / guanidine chimera explosive and a preparation method thereof, 5-bromine-3, 4-dinitro-1H-pyrazole protected by pyrazole nitrogen is used as a starting material (or without a protecting group), and 3, 4-dinitro-1H-5-guanidyl pyrazole (1) is generated through a substitution and deprotection two-step reaction or a substitution one-step reaction; the 3, 4-dinitro-1H-5-nitroguanidinyl pyrazole (2) is generated by taking the 3, 4-dinitro-1H-5-nitroguanidinyl pyrazole (1) as an initial raw material and carrying out nitration reaction. According to characterization, the thermal decomposition temperature of the 3, 4-dinitro-1H-5-guanidyl pyrazole (1) reaches up to 249 DEG C and is higher than that of an explosive RDX; actually measured impact sensitivity is 50J, friction sensitivity is 252N, and the impact sensitivity and the friction sensitivity are far better than those of RDX; the thermal decomposition temperature of the 3, 4-dinitro-1H-5-nitroguanidinyl pyrazole (2) reaches up to 221 DEG C, which is higher than that of the explosive RDX; and the detonation performance (the calculated detonation velocity is 9008m / s, and the detonation pressure is 35.7 GPa) is obviously superior to that of RDX.

The invention provides an explosive performance simulation design method based on energy, safety and process, which comprises the following steps: step 1, establishing a simulation model between explosive formula chemical composition and detonation velocity, namely an explosive formula energy performance simulation model; step 2, establishing a simulation model between the sensitization chemical group contained in the explosive formula and the impact sensitivity, namely an explosive formula safety performance simulation model; step 3, establishing a simulation model between the average particle size and the dynamic viscosity of the raw materials in the explosive formula, namely an explosive formula process performance simulation model; and 4, on the basis of the step 1, the step 2 and the step 3, taking the explosive detonation velocity, the explosive impact sensitivity and the explosive dynamic viscosity comprehensive processing result as comprehensive performance characterization parameters, and establishing an explosive formula comprehensive performance simulation model. The simulation model construction method is clear in thought and distinct in hierarchy, comprehensive performance characterization parameters are formed through linear weighting of the detonation velocity, the impact sensitivity and the dynamic viscosity, accordingly, the comprehensive performance of a group of explosive formulas with different component contents is analyzed and compared, and the method has a wide application range.

The present invention discloses a method for preparing a CoCrNi medium entropy alloy and Q235B steel explosively welded composite plate. The CoCrNi medium entropy alloy plate is annealed, and then sand, anvil, Q235B hot-rolled steel plate, support column, medium entropy alloy plate, kraft paper, and explosive are laid in sequence from bottom to top on the explosion field. Then, the explosive is explosively welded to obtain a CoCrNi medium entropy alloy and Q235B steel explosively welded composite plate. The explosive has a detonation velocity of 2500-3000 m / s and a velocities of 18-22 mm. The present invention achieves metallurgical bonding of the CoCrNi medium entropy alloy and the Q235B steel plate. The resulting composite plate has an interface bonding rate greater than 99.2%, a yield strength greater than 420 MPa, a tensile strength greater than 500 MPa, an elongation after fracture greater than 35%, and an interface shear strength greater than 200 MPa. The present invention has a simple process and is suitable for industrial production.

The application discloses a production method of an explosion-welded super-long chromium-molybdenum-vanadium hydrogen-resistant steel 12Cr2Mo1VR metal composite plate, which comprises the following steps: plate processing, plate arrangement, combined explosive frame arrangement, explosive and electronic detonator arrangement, plate withdrawal and explosion welding. According to the explosion welding explosive detonation wave movement law, different explosive detonation velocities are configured, the explosive arrangement mode is changed, the explosive detonation wave breakthrough phenomenon on the plate surface is eliminated, and the length limitation problem of the explosion-welded composite plate is effectively solved.

The application provides a TNBA cast explosive and a preparation method thereof, and belongs to the technical field of cast explosive preparation. The TNBA cast explosive is prepared according to the mass percentage of 50.6-55.2% of a liquid carrier, 4.4-4.8% of a fluxing agent and 40-45% of a solid filler. The TNBA cast explosive prepared by the application has the following advantages: the liquid carrier and the fluxing agent have high density, low volatility, low toxicity, low sensitivity and good formability, and no shrinkage hole and crack after pouring; the solid filler has the characteristics of high energy, low sensitivity, high density and high explosion heat; the raw material cost is low, the preparation process is simple, and the explosive can be produced on a large scale; compared with the existing explosives, the cast explosive has high oxygen balance, can generate more heat, has high density, detonation velocity, explosion heat and explosion pressure, and low impact sensitivity, and has higher performance than ordinary explosives.

The invention discloses an equivalent amplification-based underwater columnar charge numerical simulation method, which comprises the following steps of: selecting a small-diameter high-detonation-velocity explosive underwater columnar charge, and drawing an underwater shock wave P-v curve and a sparse wave P-v curve in an explosive product; obtaining a relational expression of the shock wave array surface particle velocity vx and the shock wave array surface pressure Px of the explosive-water interface through an intersection point of the two curves, and calculating a shock wave peak value of a cylindrical shock wave in water at a certain point to equivalently amplify the underwater columnar charge of the small-diameter high-detonation-velocity explosive into the large-diameter low-detonation-velocity columnar charge. And solving the detonation velocity D3 and the density rho3 of the large-diameter low-detonation-velocity columnar charge, and establishing an explosive detonation state equation so as to simulate the detonation state of the underwater columnar charge explosive. According to the method, the explosion state can be well described, the modeling effect is good, deformed grids are not generated, the calculation time can be greatly shortened, and the storage memory is saved.

The invention relates to a preparation method of a magnesium hydride powder emulsion explosive, and belongs to the technical field of emulsion explosives. The preparation method of the magnesium hydride powder emulsion explosive comprises the following steps: heating and mixing ammonium nitrate, sodium nitrate and deionized water to obtain a water-phase substance; and stirring and mixing the paraffin, the emulsifier and the assistant to obtain an oil-phase substance, putting the oil-phase substance into an emulsifying machine, slowly adding the water-phase substance for emulsifying, and slowly adding the high-energy sensitizer under a stirring condition to continuously stir to obtain the high-energy sensitizer. According to the prepared high-energy sensitizer, the energy density and the release efficiency are improved through synergism of all the components, the energy output strength during emulsion explosive explosion is enhanced, and the brisance is remarkably improved; the constructed efficient energy transfer network accelerates detonation wave propagation, energy loss can be effectively reduced, and the detonation velocity can be effectively improved.

The invention discloses a differentiated charging blasting method capable of efficiently utilizing energy. The method comprises the steps that a center blasting hole, a slotting hole, an auxiliary slotting hole, an auxiliary slotting guide hole, an auxiliary hole, a peripheral hole and a peripheral guide hole are sequentially formed in a working face; preparing explosives with different detonation velocities and different detonation volumes; the explosives with different detonation velocities and different detonation volumes are correspondingly loaded into different blast holes respectively; blocking the blast hole with stemming; and performing millisecond detonation, controlling a blasting time sequence, and optimizing a propagation path and action time of blasting waves. According to the differentiated charging blasting method capable of efficiently utilizing the energy, explosives with different dynamic and static effects are filled for different blast holes, and the effects of accurately and efficiently utilizing the dynamic and static energy of the explosives, improving the blasting effect and reducing blasting hazards are achieved by combining millisecond blasting.