133 results about "Rock blasting" patented technology

The invention provides a tunnel surrounding rock blasting excavation parameter setting method and system based on a neural network, and relates to the technical field of tunnel construction, and the method comprises the steps: obtaining geological characteristic data, blasting excavation historical records and excavation contour data of surrounding rock; sparse subspace clustering processing is carried out according to blasting excavation historical records to obtain a feature data set; performing stress state analysis according to the geological characteristic data, the excavation contour data and the characteristic data set to obtain a dynamic stress state and topological change data of the surrounding rock; performing association rule mining according to the blasting excavation historical record and the feature data set to obtain an optimized decision rule; performing nonlinear finite element analysis according to the dynamic stress state and the topological change data to obtain an equivalent material model of the surrounding rock; and according to the equivalent material model and the optimization decision rule, a blasting excavation parameter setting scheme is obtained. According to the invention, dynamic response analysis is carried out by using the neural network, and real-time monitoring of the surrounding rock under different blasting conditions is realized.

A method for predicting in-situ leaching effects of sandstone-type uranium mining deposits after blasting is provided, which comprises: based on a finite element analysis platform, establishing an HJC rock-blasting constitutive model, and carrying out a blasting numerical simulation; calibrating a cloud map of blasting crack damage by using a Kriging interpolation algorithm; establishing a COMSOL multiphysics model; establishing a coupling interface between the COMSOL multiphysics model and PHREEQC based on MATLAB, and optimizing a cycle duration and a time step; performing a geochemical reaction calculation and saving results, running COMSOL files, and inputting the results of geochemical reaction calculation into PHREEQC to obtain a dynamic cyclic iterative simulation; dynamically correcting migration coefficients of uranyl complexes by integrating an LSTM neural network, and stopping the cycle to output multi-scale dynamic simulation results of migration of uranium.

The invention relates to the technical field of rock drilling equipment, in particular to mine rock blasting drilling equipment and a blasting method. The equipment comprises a drill rod, a sliding mechanism and a driving mechanism, the middle of the drill rod is provided with an airflow channel, and the front end is connected with a pneumatic impactor and an impact drill bit; the sliding mechanism comprises a sliding rail, a sliding seat and a pushing mechanism; and the driving mechanism realizes rotation of the drill rod through the power device, the base and the positioning sleeve. Particularly, the pre-pressing buffering device can provide compressed air for the drill rod and provide elastic thrust, and it is guaranteed that the drill rod works stably. In addition, the transmission efficiency is improved through the meshing design of the transmission part and the abutting part of the drill rod, meanwhile, a multi-stage buffering structure is arranged, and the service life of equipment is effectively prolonged. The technical effects that the drilling efficiency is improved, the energy consumption is reduced, and the equipment reliability is enhanced are achieved.

The invention provides a rock porosity adaptive modeling and blasting crack expansion calculation method based on key-type near-field dynamics, and the method comprises the steps: constructing a unified near-field dynamics model containing pore adaptive generation and blasting dynamic response; dynamic simulation of the rock blasting process is realized through pore distribution control, blasting load time history application and crack evolution judgment, and crack initiation, expansion and penetration rules can be accurately reproduced while the calculation stability is ensured. By introducing a pore adaptive discrete algorithm, the construction of rock models under different porosity conditions is automatically realized, and the initiation, expansion and penetration processes of cracks in the rock mass are accurately predicted in combination with near-field dynamics mechanical calculation under the action of an explosion load. According to the method, the heterogeneous characteristic of the rock and the discontinuous effect of the blasting load can be considered at the same time under a unified dynamic framework.

The invention discloses a rock blasting load transfer and throwing simulation method which comprises the following steps: S1, acquiring field parameters of a target blasting project, the field parameters comprising rock mass mechanical parameters, explosive parameters, blast hole parameters and charging structure parameters; and S2, based on the field parameters, constructing a three-dimensional explosive-rock calculation model by adopting pretreatment software, dividing grids, importing the grids into finite element software, setting a material model, a state equation and boundary conditions, and simulating an explosive detonation process. The limitation of a single numerical value method is solved; quantitative analysis and accurate prediction of rock blasting lumpiness are achieved, inclined joints are adopted in the discretization process, actual rock mass joint distribution is better fitted, and the reliability of a simulation result is improved; bulk rocks and excessive crushing phenomena are effectively reduced, the explosion energy utilization rate is improved, the engineering cost is reduced, and a scientific basis is provided for explosion design of projects such as mining and water conservancy and hydropower.

The invention discloses an asymmetric and uncoupled tunnel smooth blasting method. The method comprises the steps that surrounding rock grading data and initial ground stress distribution of a target area are obtained, and a low-damage trial blasting scheme is optimized; drilling operation is conducted on the basis of the low-damage trial explosion scheme, a specific pre-charging place is selected to assemble an asymmetric non-coupling refined charging sleeve device, and a peripheral hole pre-charging sleeve device is further assembled; the peripheral holes are filled through a peripheral hole pre-charging sleeve device, other blast holes are filled in a continuous charging mode, and blocking is conducted after filling is completed; and constructing a detonating network, ventilating after detonating, checking the detonating effect, and iteratively optimizing a trial detonating scheme according to a damage judgment result. According to the method, the acting direction and the acting range of energy during blasting of explosives in peripheral holes can be accurately controlled, so that the disturbance influence of the blasting effect on surrounding rocks is relieved, the blasting damage degree of the surrounding rocks is reduced, construction safety is guaranteed, the occurrence frequency of back break phenomena is reduced, and the construction efficiency can be greatly improved.

The invention discloses a rapid identification method for ground-air combined analysis of a rock blasting effect, which is characterized by comprising the following steps of: collecting advantage information in a ground-air manner through an image processing technology of an unmanned aerial vehicle and an exploration vehicle, performing data comparison and calibration by taking the advantage information as a reference, and determining a muck pile area; establishing a visual three-dimensional explosion area by using a deep learning algorithm; then, the grade of rock in the muck pile area unit block is subjected to rapid field identification through the visual three-dimensional muck area; then estimating the rock grade of each unit block by using a distance power inverse ratio method according to the rock grade subjected to rapid field identification; and finally, estimating the rock grade of the whole muck pile area according to the rock grade of each unit block. By fusing the unmanned aerial vehicle and the all-terrain exploration unmanned vehicle, rapid acquisition and accurate analysis of the blasting muck pile particle size after open blasting are achieved, the efficiency and accuracy of blasting effect evaluation are remarkably improved, the problems of subjective errors and time consumption of a traditional method are solved, and technical support is provided for intelligent mine construction.

The invention belongs to the technical field of tunnel surrounding rock blasting blast hole slag removal devices, and particularly relates to a tunnel surrounding rock blasting blast hole slag removal device which comprises a slag removal suction head assembly used for stretching into a blast hole to remove slag; the feeding end of the negative pressure dust collection assembly is communicated with the discharging end of the slag removal suction head assembly; the slag removal suction head assembly comprises an inner cylinder and a slag removal suction head, the outer cylinder coaxially sleeves the outer side of the inner cylinder, and the outer cylinder is in sliding fit with the other end of the inner cylinder; the air inlet part is arranged in the outer cylinder, one end of the air inlet part is communicated with the atmosphere, and the other end of the air inlet part extends into the blast hole along with the outer cylinder and then is communicated with the inner cylinder; the fixed end of the reciprocating driving part is arranged on the inner cylinder, the movable end of the reciprocating driving part is connected with the end part of the outer cylinder, and the reciprocating driving part is used for driving the outer cylinder to slide on the inner cylinder in a reciprocating manner; the stone crushing part is fixedly connected to the end, away from the inner cylinder, of the outer cylinder. According to the device, the outer cylinder slides on the outer side of the inner cylinder in a reciprocating mode under the action of the reciprocating driving part, rock blocks remaining on the inner wall of a blast hole are crushed, and the cleaning effect is improved.

The invention discloses a surface mine surrounding rock blasting crack range control method which comprises the following steps: determining a target blasting crack range according to geological conditions and mining requirements of a target surface mine; a plurality of preset blasting holes are formed in the surrounding rock, and the depth and the interval of the blasting holes are optimally designed according to the target blasting crack range; each blasting hole is filled with a preset amount of explosive, a plurality of segmented detonating devices are arranged, and the detonating time of the segmented detonating devices is controlled according to the target blasting crack range; explosives in the blasting holes are sequentially detonated through a segmented detonating device, and a preset blasting crack range is formed; monitoring the crack extension condition in the blasting process in real time by using monitoring equipment, and dynamically adjusting subsequent blasting parameters according to a monitoring result; according to the method, the blasting crack range is accurately predicted through the neural network, then the blasting parameters are accurately controlled, and the method has important practical significance for improving the blasting efficiency, guaranteeing the surrounding rock stability and reducing the mining cost.

The invention provides a gas phase change rock breaking device and method based on an aluminothermic reaction, and belongs to the technical field of rock blasting. The rock breaking device comprises a graphite excitation pipe, a liquefied air bag and a sealing cover, the excitation pipe is filled with thermite, and thermite reaction can be carried out to release heat; the liquefied air bag is hermetically sleeved outside the excitation tube, is filled with liquid oxygen or liquid nitrogen and is changed into gas under the action of heat released by the excitation tube, and rock mass fracture is realized by volume expansion. By arranging a multi-section excitation pipe serial connection structure, adopting the industrial graphite excitation pipe, designing a liquid oxygen or liquid nitrogen double-medium system and using the polyethylene degradable material bag body, the safety, the economical efficiency and the environmental adaptability of open-air rock mining are remarkably improved.

The invention relates to a method for excavating a rock bench of a palisade crane beam, and relates to the technical field of water conservancy and hydropower engineering. According to the rock wall crane beam rock bench excavation method, the placement amount and the standard of the detonating cord are determined according to the rock strength and the integrity degree, detonation waves in a blast hole act uniformly during blasting, the excavation flatness and the half-hole rate can be improved, overexcavation is reduced, damage of blasting to surrounding rock is reduced, the surrounding rock blasting loosening circle is reduced, the blasting excavation quality is effectively improved, and the rock bench excavation efficiency is improved. The method has important significance on later operation safety of the rock wall crane beam, the construction cost is reduced, the linear construction period is shortened, and the construction efficiency is improved.

The invention discloses a post-blasting sandstone type uranium mine in-situ leaching mining effect prediction method, and relates to the field of sandstone type uranium mine in-situ leaching mining effect numerical simulation, and the method comprises the steps: building an HJC rock blasting constitutive model based on a finite element analysis platform, and carrying out the blasting numerical simulation; calibrating the blasting crack damage nephogram through a Kriging interpolation algorithm; a COMSOL multi-physical field model is constructed; constructing a coupling interface of the COMSOL multi-physical field model and the PHREEQC based on MATLAB, and optimizing the cycle time and the time step length; performing geochemical reaction calculation and storage, running a COMSOL file at the same time, and inputting a geochemical reaction calculation result into PHREEQC to obtain dynamic loop iteration simulation; and through integration of the LSTM neural network, dynamically correcting the migration coefficient of the uranyl complex, carrying out circulation termination, and outputting a uranium migration multi-scale dynamic simulation result. According to the method, multi-scale dynamic simulation of uranium migration in the leaching agent injection process is realized, and the uranium migration prediction precision is improved.

The invention discloses a loading structure optimization method based on stress wave analysis in open bench blasting. The method comprises the following steps: S1, performing rock mass blasting and stress wave theoretical analysis, researching a rock mass blasting rock breaking process and a breaking mechanism, deducing rock mass blasting mechanisms under different coupling media, and analyzing the influence of different coupling media on the blasting effect; and S2, calculating the initial delay detonation time according to the delay detonation rock blasting principle, and determining the optimal delay detonation time through numerical simulation calculation and field test demonstration. According to the method, a method combining theoretical analysis, numerical simulation and field test is comprehensively applied, a scientific and systematic charging structure optimization scheme is provided for open bench blasting, wide applicability and popularization value are achieved, progress of the open bench blasting technology can be promoted, and sustainable development of the mining industry is promoted.

The invention discloses a method for measuring average blasting lumpiness, which comprises the following steps of: S1, carrying out an on-site rock blasting test, and carrying out multi-point camera shooting identification on a muck pile after the blasting test by using an unmanned aerial vehicle; s2, performing multi-point sampling on the blast heap after blasting, and performing screening calculation on the sampled rock mass by adopting screening equipment or manual screening to obtain an actual screening value of the average blasting lumpiness; s3, performing image recognition processing on the picture shot by the unmanned aerial vehicle to obtain an image recognition value of the blasting average lumpiness; s4, performing multiple bursting tests to obtain multiple groups of data, and correcting the image recognition data by using the statistical analysis data to obtain a fitting correction relationship; and S5, after field blasting, an unmanned aerial vehicle is used for shooting an image, recognition processing is carried out, and the fitting relation is used for correction, so that the average lumpiness of each blasting can be obtained. The method is high in pertinence, wide in applicability and easy and convenient to operate, the method combining image processing and manual screening is effectively utilized, the screening result is used for correcting the image processing result, then the accurate prediction result can be obtained according to the correction relation and the image processing result, the precision is high when the blasting lumpiness is predicted, and the prediction accuracy is high. The method adapts to blasting lumpiness prediction under different complex conditions, and is economical and efficient.

The invention provides an FDEM-based rock blasting process simulation method and system considering blasting gas, and the method comprises the steps: building a jointed rock blasting numerical model comprising a blast hole, a rock mass and a joint network based on a finite element-discrete element coupling method; setting a static-dynamic unified boundary condition for the jointed rock mass blasting numerical model, and applying a blasting stress wave load; constructing an explosion gas action model, and dynamically calculating a transient explosion cavity area and transient gas pressure; transient gas pressure is coupled and applied to the boundary of the crack and the surface of the isolated rock; and operating the solver, simulating the whole process from stress wave propagation, joint attenuation effect, crack initiation and propagation to blasting gas driven crushing and throwing, and analyzing the result. The method provided by the invention overcomes the defect that the existing method is difficult to simultaneously and accurately characterize the joint effect and the action of the blasting gas, obviously improves the authenticity and reliability of the simulation of the blasting rupture process of the jointed rock mass, and provides an effective tool for blasting mechanism research and engineering optimization design.

The invention provides a plateau mountain area small-clear-distance tunnel construction method which comprises the following steps: firstly, adjusting an excavation section of an advance hole, excavating a contour to cover interlaced rock, and constructing a steel frame; then constructing a side wall support at an excavated position of a front hole support and a rear front hole support; constructing an inverted arch primary support of the preceding hole; constructing an advance hole inverted arch and filling the inverted arch; an upper step of the following hole is excavated, and primary support is constructed; excavating a lower step of the rear hole, and constructing a primary support; excavating an inverted arch of the posterior hole, completing initial supporting of the inverted arch, and removing the part, invading the posterior hole, of the steel frame; constructing a posterior hole inverted arch, and filling the inverted arch; and finally, after tunnel anchor blasting operation is completed, secondary linings of the preceding hole and the following hole are constructed. According to the construction method, the successive hole method is adopted for construction, the construction period is shortened, the cost input is low, and the material and management cost is saved; disturbance to surrounding rocks is small, the vibration influence on blasting of the surrounding rocks is reduced, and the integrity of the surrounding rocks can be effectively kept.

The invention provides a rock mass blasting parameter inversion method, electronic equipment and a storage medium, and belongs to the technical field of blasting parameter design. The method comprises the steps that the damage tolerance and first blasting parameters of a rock mass are determined; the explosion process of the explosive is divided into a first stage dominated by stress waves and a second stage dominated by detonation gas. In the first stage, damage factors of the rock mass under stress wave damage are calculated. In the second stage, based on the damage factors, the crack expansion degree of the rock mass under the explosion gas damage is calculated, the damage prediction radius of the rock mass is obtained, and a damage prediction model is constructed. And calculating a first damage radius of the rock mass under the first blasting parameter based on the damage prediction model. When the first damage radius is smaller than or equal to the damage tolerance, the first blasting parameter is output, otherwise, the first blasting parameter is adjusted to be a second blasting parameter, and when the second damage radius is smaller than or equal to the damage tolerance, the second blasting parameter is output. The inversion method provided by the invention can improve the precision degree of controlling the blasting damage range.

The invention relates to the technical field of rock blasting fracture mechanics, in particular to a blasting crack tip stress intensity factor calculation method and system.The method comprises the steps that first information and second information are obtained, the first information comprises the wave velocity of longitudinal waves and the wave velocity of transverse waves in a dynamic optical measurement mechanics experiment, and the second information comprises the instantaneous velocity of crack propagation; optimizing a stress intensity factor calculation formula of the crack tip according to the first information and the second information to obtain an optimized calculation formula; obtaining experimental data in a dynamic optical measurement mechanics experiment; and determining the crack tip stress intensity factor of the detonation crack according to the optimized calculation formula and experimental data in a dynamic optical measurement mechanics experiment. Compared with a conventional calculation method for the crack tip stress intensity factor of the detonation crack, the method has the advantages that a crack propagation instantaneous speed parameter is introduced; the influence of speed change on crack tip stress intensity factor calculation is considered, and the accuracy of a crack tip stress intensity factor calculation result is improved.

The utility model discloses an open-air rock blasting warning device in the technical field of warning devices, which comprises a bearing bottom plate, moving wheels are mounted at four corners of the lower surface of the bearing bottom plate, four groups of long bolts are vertically connected in the bearing bottom plate, grounding cones are arranged at the bottoms of each group of long bolts, and a fixing cylinder is further mounted on the upper surface of the bearing bottom plate. An electric box is arranged on the outer side wall of the fixing cylinder, a lifting assembly is arranged in the fixing cylinder and comprises a connecting sliding sleeve, a penetrating sliding groove matched with the connecting sliding sleeve is formed in the outer wall of the right side of the fixing cylinder, a mounting table plate is connected to the outer side wall of the connecting sliding sleeve, and a rotating mechanism is arranged on the mounting table plate and comprises a driven fluted disc; according to the open-air rock blasting warning device, the height and the direction of the blasting warning alarm can be adjusted, when the open-air rock blasting warning device gives an alarm, the spread sound is farther, the spread sound can directly face people, the warning effect is better, and the safety during open-air rock blasting is improved.

The invention discloses a rock blasting lumpiness simulation and grading prediction method based on image processing, and the method comprises the following steps: S1, constructing a three-dimensional numerical calculation model by adopting pretreatment software HYPERMESH based on the on-site actual rock mass mechanical parameters and blasting design parameters, dividing grids, and importing the grids into finite element software LS-DYNA; the on-site actual rock mass mechanical parameters comprise rock density, elastic modulus, Poisson's ratio, yield strength and tangential modulus, and the blasting design parameters comprise blast hole spacing, row spacing, charging structure, explosive type and charging amount. According to the invention, through combination of finite element simulation and image processing, rock lumpiness simulation and grading prediction before blasting are realized, and a prediction result is highly matched with a field test; blasting parameters can be optimized in advance, secondary blasting or excessive smashing is avoided, and the engineering cost is reduced; the operation process is standardized, software is easy to obtain, engineering popularization and application are facilitated, and the method has great significance in improving the rock blasting fine design level.

The embodiment of the present invention discloses a quantitative evaluation method of the rock-breaking effect of explosion stress wave and blasting gas, and a rock blasting method, wherein the evaluation method includes: setting a plurality of relative position relationships between explosives and blastholes, wherein the explosives are located in the blastholes and there is a cavity between the explosives and the blasthole wall, and the volume of the cavity between the explosives and the blasthole wall in the direction of the measured position of the rock under different relative position relationships is different; for each relative position relationship: placing the explosives at the corresponding position in the blasthole, using the explosion effect of the explosives in the blasthole to apply a load to the rock to destroy the rock; based on the stress conditions and / or damage conditions of the measured position of the rock during the rock destruction process under various relative position relationships, the rock-breaking effect of the explosion stress wave and the blasting gas is quantitatively evaluated. The embodiment of the present invention can be applied to the experimental scene of the study of the action mechanism of the explosion stress wave and the blasting gas, and realizes the accurate identification and quantification of the rock-breaking effect of the coupling of the explosion stress wave and the blasting gas.

The embodiment of the utility model discloses a joint-cutting fracturing device assembly, relates to the technical field of rock blasting, and can effectively improve the positioning precision of a joint-cutting fracturing device during construction and installation. The assembly comprises a joint-cutting fracturing device, an identifier, a lifting rope and a distance-measuring illumination instrument, the kerf fracturing device is provided with a tubular structure, and a kerf is formed in the pipe wall of the tubular structure. The mark is used for being arranged at the first end of the joint cutting fracturing device; the lifting rope is used for being connected with the joint-cutting fracturing device so as to lift the joint-cutting fracturing device into a blast hole; the distance measuring illuminator is used for measuring the distance of the joint cutting fracturing device and can provide illumination. The method is suitable for the slope boundary presplitting blasting scene of the surface mine.

The utility model relates to the technical field of blasting devices, discloses a hole bottom air spacer for rock-soil blasting, and solves the problem that the spacer cannot adjust the depth position of explosive in real time, so that the spacer is inconvenient to use. A protection assembly is fixedly arranged on the outer side of a spacer main body, the spacer main body comprises a lifting structure, and the lifting structure is arranged on the outer side of the spacer main body; the lifting structure comprises an air bag, an air inlet is fixedly formed in the upper end of the air bag, a position adjusting structure is movably arranged on the inner side of the lifting structure, gas is inflated into the air bag through the air inlet, the air bag rapidly expands and recovers and jacks up the position adjusting structure to ascend, and the explosive reaches the preset ideal position. The operation process is optimized, time and labor are saved, precision is high, and practicability of the device is greatly improved.

The invention discloses an underwater rock blasting device and method for channel excavation, the underwater rock blasting device for channel excavation is put in an underwater hole site and located below an explosive, the underwater rock blasting device for channel excavation comprises a shell, a reflecting part is arranged in the shell, the reflecting part is provided with a reflecting surface used for reflecting downward blast waves to the periphery, and the reflecting surface is provided with a plurality of blasting holes. An air cushion area is arranged between the reflecting part and the top of the shell, and the shell can be broken under the explosion of the explosive. According to the technical scheme, the shell is put below the explosive at the underwater hole position, when the explosive explodes, the shell is broken due to explosion of the explosive, shock waves of the explosive continue to move downwards and impact on the reflecting face of the reflecting part, the reflecting face prevents the shock waves of the explosive from continuing to move downwards and reflects the shock waves to the periphery, and therefore the shock waves of the explosive can be effectively reflected. And meanwhile, after the shock waves are reflected to the periphery, the explosion range of the explosive in the horizontal direction can be increased, the using amount of the explosive is further saved, and potential safety hazards are reduced.

The invention discloses a hard rock explosion test system and method in a deep ground stress environment, and belongs to the technical field of rock explosion optimization design, the system comprises a ground stress hydraulic loading module, a sample bearing module, an explosion generation module, a non-contact optical measurement module and an automatic trigger device; the method comprises the steps of sample processing, system assembling, blasting structure laying, sample surface processing, ground stress loading, measurement preparation, explosion testing and data processing. According to the hard rock explosion test system and method in the deep ground stress environment, the blank of a large-size and large-equivalent explosion test platform and analysis means under deep in-situ ground stress is filled; a parallel efficient calculation digital image correlation analysis system is constructed, and an explosion pressure field can be quickly inverted.

This invention discloses a blasting device and a rock blasting method, relating to the field of rock blasting technology, which can improve construction efficiency. The blasting device includes a shell, a first shaped charge liner, and a second shaped charge liner, the first and second shaped charge liners being disposed opposite to each other; both the first and second shaped charge liners are parabolic metal liners; the shell includes a first outer wall and a second outer wall, the first and second outer walls being disposed opposite to each other, the first shaped charge liner being fixedly connected to the left side of the first outer wall and the left side of the second outer wall respectively, and the second shaped charge liner being fixedly connected to the right side of the first outer wall and the right side of the second outer wall respectively; the cavity formed by the first outer wall, the second outer wall, the first shaped charge liner, and the second shaped charge liner is used to store explosives. This invention is applied to rock blasting scenarios.

The invention discloses a carbon dioxide fracturing underwater rock mass blasting method. The method comprises the steps that 1, the hole position of a drilling ship or a drilling machine is precisely positioned based on a positioning system; step 2, drilling a fracturing hole in the rock mass by adopting a sleeve as a guide; 3, detonator leg wires of the fracturing pipe are connected, and the fracturing pipe is filled with liquid carbon dioxide; setting a target filling pressure to control a crushing range; 4, the fracturing pipe is lowered to the bottom of the fracturing hole; keeping a detonator leg wire extending out of the sleeve; 5, the fracturing hole is filled with a plugging material and tamped; 6, detonator leg wires are connected and then connected into an ignition bus, and the ignition bus is led to a safety ignition station; the end of the ignition bus is subjected to waterproof insulation treatment; 7, after the evacuated personnel arrive at the safe area and safety alert is set, ignition and detonation are conducted; and 8, after rock breaking, safety is confirmed, and warning is relieved. The sequence of the step 3, the step 1 and the step 2 is not the same. The method has higher environmental protection standards and engineering benefits under complex ocean working conditions.

The application provides a method and system for determining millisecond millisecond differential blasting time of frozen rock, which can reasonably determine the millisecond differential blasting time of frozen rock in cold regions and accurately predict the blasting effect. The method comprises the following steps: step 1, considering the influence of temperature on wave velocity, calculating the stress wave propagation velocity of frozen rock, wherein T represents the temperature of rock; A, B, C and D are parameters related to the longitudinal wave velocity of rock, which are obtained by fitting the wave velocity data of rock at different temperatures; step 2, calculating the frozen rock blasting millisecond differential time based on the stress wave propagation velocity. The system comprises: a wave velocity acquisition unit, which considers the influence of temperature on wave velocity and adopts the stress wave propagation velocity of frozen rock; a blasting millisecond differential time calculation unit, which calculates the frozen rock blasting millisecond differential time based on the stress wave propagation velocity; an input display unit, which inputs the operation instruction of the operator and displays the corresponding information according to the operation instruction; and a control unit, which is in communication with each unit and controls the operation of each unit.

The application discloses an air spacing device for blasting holes in an open-pit mine and a blasting structure. The air spacing device comprises support rods A, support rods B, a circular ring a, a connecting component and a pull rod. The upper end of each support rod A is welded with a connecting ring. Four connecting rods are perpendicularly welded at one end on the inner side of the circular ring a. A circular ring b is arranged at the central position of the inner side of the circular ring a. The circular ring b is welded with the other end of the four connecting rods. Four support rods A are respectively sleeved at four empty spaces of the circular ring a. One end of each support rod B is rotatably connected to the middle position of each support rod A. The other end of each support rod B is rotatably connected to the connecting component. The upper end of the connecting component is welded with a circular ring c. The pull rod is connected to the circular ring c through the circular ring b for cooperation. The device greatly reduces the workload, guarantees the smooth development of the charging work, achieves the charging design of air spacing charging, makes the explosion energy uniformly distributed, improves the rock blasting effect, is simple in operation and improves the production benefit of the mine.

The present application relates to the technical fields of rock blasting, in particular to a kind of detection equipment and method for blasting hole for rock blasting, including drive rotary table, drive assembly is equipped on the drive rotary table, identification device for identifying hole collapse is symmetrically equipped on the drive assembly, both ends of each identification device are equipped with synchronous assembly, one side of the synchronous assembly is equipped with recording assembly, the side end of the recording assembly is equipped with paper outlet assembly, the identification device includes induction assembly and control assembly.The present application can automatically detect hole depth and hole wall hole collapse position by the working of identification device and recording assembly, and record and analyze hole collapse position at the same time, so that detection efficiency and convenience are greatly improved.