11 results about "Blast load" patented technology

The invention provides an operator neural network-based reinforced concrete member damage intelligent evaluation method, which is applied to the field of civil engineering structure anti-explosion analysis, and comprises the following steps: obtaining member characteristic parameters of a reinforced concrete target member and load parameters of a plurality of explosion load working conditions; inputting the component characteristic parameters and the load parameters of the plurality of explosion load working conditions into a trained physical information operator neural network to obtain a dynamic response time history of the target component under each explosion load working condition; based on the dynamic response time history of the target component under each explosion load working condition, the maximum center displacement of the target component under each explosion load working condition is determined; generating a pressure-impulse diagram of the target component based on the load parameters of the plurality of explosion load working conditions and the maximum center displacement set; and based on the pressure-impulse diagram, performing explosion damage evaluation on the target component. According to the method, the pressure-impulse diagram of the reinforced concrete member under the blast load can be quickly and accurately generated.

This invention discloses a design and manufacturing method for a uniform cross-section explosive load simulator based on gradient elastic metamaterials, relating to the field of impact loading. Addressing the problems of high cost per use and the susceptibility of variable cross-section elastic rods to local buckling instability under high-speed impact leading to waveform distortion in existing simulators, this invention, while maintaining the macroscopic uniform cross-section shape of the simulator, derives the ideal wave impedance gradient required to achieve the target explosive load based on the one-dimensional elastic wave propagation inverse design theory; establishes the mapping relationship between the relative density of a three-period minimal surface (TPMS) metamaterial unit cell and its equivalent mechanical parameters, and inversely solves the spatial relative density distribution function; extracts the waveform through dynamic impact finite element simulation, and introduces an impedance gradient correction factor to perform nonlinear iterative correction of the density function, obtaining a final three-dimensional metamaterial geometric model that accurately matches the waveform, and uses a flexible polymer material for additive manufacturing. This invention achieves the purely elastic, non-destructive, and reusable simulator, perfectly adapting to the stable firing of light gas cannons, and exhibiting excellent anti-instability capability and waveform fidelity under strong dynamic loads.

The application discloses a tunnel blasting impact disturbance load precise simulation method and device, and relates to the technical field of blasting load simulation. The method comprises the following steps: obtaining rock mass physical data and joint fissure geometric characteristics of a tunnel region to be simulated, establishing a three-dimensional finite element model, and performing local grid encryption on a blast hole influence region; applying blast hole wall pressure time history data, simulating equivalent plastic strain and plastic strain rate of a grid, and defining an elastoplastic constitutive model of damage evolution based on the same; generating a blasting response data set by using a smoothed particle hydrodynamics method, and applying the same to the model grid; dynamically updating rock mass permeability and solving a gas seepage control equation, realizing coupling of blasting impact and gas driving, and completing load simulation. The method can more accurately simulate a gas seepage process, and then realize coupling of gas driving and blasting impact, effectively improves the scientificity and accuracy of tunnel blasting impact disturbance load simulation, and effectively improves the safety and economy of a tunnel project.

The application discloses a kind of rock blasting equivalent loading stress curve inversion methods, comprising the following steps: blasting device is detonated to the rock to be measured, and the strain curve of monitoring point is obtained by high-speed acquisition instrument;According to the macroscopic mechanical properties of the rock to be measured, the rock microscopic parameters required by discrete element numerical software are calibrated, and the rock numerical test specimen of the same size as laboratory test is established;Equivalent loading stress peak value, stress loading time and unloading time and the like iteration initial value are brought into rock blasting numerical model, and the strain curve of monitoring point in model is calculated.Error between the curve measured by model and the measured curve is adjusted to stress peak value and time.Finally, when the error is less than a certain value, the rock mass blasting equivalent loading stress loading curve is determined.The application overcomes the problem of elastic inversion distortion caused by rock blasting damage;Not only the accurate calculation of blasting loading stress peak value is realized, but also the whole process of blasting loading stress path can be inverted.

The invention provides a method and a system for determining an explosion load of an axial air interval charging hole wall, and belongs to the technical field of numerical simulation of explosive mechanics and geotechnical engineering. According to the method, theoretical analysis and derivation are carried out on the explosion process of the charging section, a calculation method for the load peak values of the charging section and the air section is established, and the load peak values serve as key parameters to be reasonably given to a load duration curve of each node of a blast hole wall. According to the method, the obvious difference between the charging section and the air section is fully considered, and the load applying modes under different charging structure conditions are distinguished, so that the constructed blast hole wall load curve better conforms to the actual explosion process in the aspects of peak value characteristics, action time history and spatial distribution. The method is clear in calculation process, clear in physical significance, suitable for various axial charging structural forms, capable of effectively improving the accuracy of drilling and blasting numerical simulation and engineering analysis results and good in engineering application value.

The invention discloses a blasting vibration prediction method considering the influence of the dip angle of a fault zone, and relates to the field of blasting engineering and blasting vibration prediction.The blasting vibration prediction method comprises the following steps that physical and mechanical parameters of a rock mass and the fault zone on a blasting vibration propagation path are collected, and a rock mass blasting numerical model containing the fault zone is established through dynamic finite element software LS-DYNA; the blasting load peak intensity acting on the blast hole wall is obtained through calculation based on the detonation wave theory, and the attenuation process of the blasting load on the blast hole wall is simulated through a double-exponential curve; and calculating blasting numerical models of different fault zone inclination angles, determining the range of a blasting vibration amplification area in front of the fault zone, and proposing a prediction formula of the blasting vibration amplification area considering the fault zone inclination angles. According to the method, the emission superposition amplification effect of the fault zone on blasting vibration is considered, the peak vibration speed of the blasting vibration amplification area in front of the fault zone can be effectively predicted, the accuracy of blasting vibration full-path prediction is improved, and reference can be provided for blasting vibration safety control.

The invention discloses a method for rapidly applying a motion charge explosion load on a structure, and belongs to the technical field of explosion mechanics, and the method comprises the following steps: obtaining finite element models of motion charge incident explosion and reflection explosion, and obtaining overpressure time-history curves of incident shock waves and reflection shock waves at different positions in a space; spatial distribution of incidence peak overpressure, specific impulse and overpressure reflection coefficient of incident shock waves of the motion charge explosion is obtained through the overpressure time-history curve; and a calculation formula of incident peak overpressure, specific impulse and overpressure reflection coefficient of incident shock waves of the motion charge explosion is introduced through spatial distribution. By accurately capturing shock wave space distribution and introducing a quantification formula, the situation that local pressure is amplified due to reflection superposition of load deviation is avoided; the fitting coefficient optimizes the dynamic prediction, refines the duration to match the structural response, resulting in a subprogram generating a unit level curve, which can quickly apply a motion charge blast load to the structure.

This invention relates to the field of mine blasting safety technology, and particularly to a control method and explosion reduction device for the boundary of a sector-shaped deep-hole blasting stope. The control method obtains the explosion load time history curve through a borehole wall pressure network testing system, calculates the effective damage radius and optimal micro-delay time of a single hole by combining rock mechanics parameters, selects suitable energy-absorbing materials based on the pressure curve and damage threshold, and determines their size. A precise digital model of the stope and roadway is constructed using three-dimensional laser scanning technology. Based on the above data, the layout of the sector-shaped blast holes is designed, energy-absorbing materials are installed at the bottom of the holes, and micro-delay initiation is carried out in zones according to the optimal micro-delay time. This method changes the limitations of traditional technology that relies on experience-based estimation, and provides a scientific quantitative basis for energy control. It can guide the selection of energy-absorbing materials and achieve active and precise control of explosion energy, thus avoiding the damage caused by the blind release of blasting energy from the source.

The application discloses a kind of early support early age period shotcrete safety evaluation method under cyclic blast load, and the application relates to the field of concrete reliability analysis, comprising the following steps: determining the geometric parameters of the tunnel to be protected, and establishing a tunnel finite element model;Determine the blast load using the blast wave theory, and perform finite element analysis on the model by applying the load to obtain the residual deformation data of each extraction point;Determine the blast load influence range;Monitor the ambient temperature time series data of the evaluation sub-section, and characterize its hydration degree and water content;Establish the mapping relationship between the mechanical characteristic parameters and the hydration degree and water content, calculate the mechanical characteristic parameters of the concrete, and determine the safety of the shotcrete by comparing the damage and safety difference standards, improve the scientific nature of the safety evaluation of shotcrete.

The invention relates to a tunnel blasting excavation and support equivalent simulation method based on three-dimensional finite difference, and the method comprises the steps: constructing a three-dimensional finite difference model, determining surrounding rock parameters, obtaining an exponential stress time-history load through calculating the time-history form of an equivalent peak load and a blasting load, and calculating the time-history form of the equivalent peak load and the blasting load; a simulation result is obtained based on coupling simulation crustal stress transient unloading, an anchor rod supporting area is equivalent to the thickness of a reinforcing ring, the combined effect of sprayed concrete and a steel arch is equivalent to a lining layer, at least one piece of response data is obtained based on the results, and finally an equivalent simulation feasibility result is obtained. Therefore, the problems that a blasting load model is simplified, a crustal stress unloading mechanism is incomplete, the simulation efficiency of a composite support system is low, the subjectivity of rock mass mechanical parameters is high and the like in the prior art are solved, and numerical simulation of blasting-unloading-support mechanical behaviors in the drilling and blasting construction process of the large-section tunnel is achieved. And a theoretical tool and a decision basis are provided for fine and quantitative optimization design of a support scheme.

The present application relates to a kind of reinforced concrete beam displacement response calculation method under near explosive load, belong to protective engineering and structural dynamics technical field, solve the problem that the overall dynamic process is affected by ignoring local damage in prior art, leading to the problem that the dynamic response of reinforced concrete beam under near explosion cannot be accurately described.It includes obtaining charge parameters and beam structural parameters, and performing local damage feature prediction to obtain local damage size;Based on the charge parameters of near explosion load, the local response of reinforced concrete beam is calculated to obtain the initial state of the overall response of the local dynamic response, and then the cross response;Based on the structural parameters of reinforced concrete beam, local damage size, local overall coupling parameter correction is carried out to obtain the correction relationship, and then the conversion coefficient is obtained, and then the dynamic response is calculated by using elastic-plastic SDOF difference motion equation to obtain the cross displacement response result.The high-precision displacement response calculation of reinforced concrete beam is realized.