435 results about "Transverse wave" patented technology

The invention provides an airfield pavement detection method based on an earthquake background noise imaging technology, and relates to the technical field of airfield pavement detection. Comprising the following steps: acquiring seismic background noise data of an airport pavement to be measured; preprocessing the seismic background noise data to obtain preprocessed noise data; carrying out cross-correlation calculation on the preprocessed noise data and carrying out empirical Green function extraction; according to the empirical Green function, a surface wave group velocity frequency dispersion curve is extracted by adopting spatial autocorrelation and multiple filtering methods; inverting shear wave velocity distribution of each layer of the pavement based on the surface wave group velocity dispersion curve, and constructing a three-dimensional velocity model; determining a shear wave velocity distribution diagram according to the three-dimensional velocity model; and determining a detection result of the airfield pavement to be detected according to the transverse wave velocity distribution diagram. According to the invention, the problems of low detection precision and poor real-time performance of a common detection technology in the prior art are solved.

The invention relates to the technical field of cast-in-place pile detection, and discloses a cast-in-place pile integrity detection system based on a multi-mode ultrasonic array, and the system comprises a deformable multi-mode ultrasonic probe which is used for adaptively adjusting the posture through an intelligent material driver; the intelligent coupling injection module is used for automatically cleaning the inner wall of an internal channel of the cast-in-place pile; the multi-source data processing module is used for receiving the original ultrasonic waveform data and the real-time position information of the ultrasonic probe; the deep learning recognition module is used for generating a recognition result including defect categories and preliminary features; the defect positioning and evaluating module is used for constructing a defect model comprising defect space coordinates, geometric dimensions and severity parameters; and the diagnosis decision module is used for providing targeted repair suggestions. The ultrasonic signals are transmitted and received through the integrated longitudinal wave transducer, the transverse wave transducer and the Rayleigh wave transducer, the internal structure information of the pile body is obtained, in this way, the ultrasonic beam coverage range is expanded, and the detection blind area of the area between the sounding pipes in a traditional method is effectively made up.

The invention discloses a multi-wave chromatography and reflection combined detection method and device for a thin-covering-layer urban active fault and a medium. The method comprises the steps that longitudinal wave seismic data and transverse wave seismic data are collected; recording vertical component data based on the longitudinal wave seismic data for first arrival travel time pickup and tomography inversion to obtain a longitudinal wave velocity structure model Vp; extracting Rayleigh surface wave frequency dispersion through the vertical component data and carrying out multichannel surface wave analysis inversion to obtain a transverse wave velocity structure model Vs; calculating a longitudinal and transverse wave velocity ratio parameter structure model Vp / Vs, and calculating to obtain a Poisson's ratio parameter structure model v; obtaining a longitudinal wave (P wave) reflection profile and a transverse wave (S wave) reflection profile; identifying and summarizing into an interpretation fracture set Fc, and recording key elements; and by taking the interpretation fracture set Fc as a structural skeleton, completing unified registration and superposition display on Vp, Vs, Vp / Vs and v, a longitudinal wave reflection profile and a transverse wave reflection profile, and outputting a shallow underground structure comprehensive interpretation map of the thin covering layer region.

The invention provides a full-section detection method, device and equipment for reinforcing a steel rail welding seam and a storage medium, and relates to the technical field of nondestructive testing. The method comprises the following steps: respectively arranging a plurality of first phased array probes on rail head treads and rail bottom surfaces of a first steel rail and a second steel rail, and arranging a second phased array probe right above a welding seam; the detection method comprises the following steps: determining optimal parameters of a transducer based on the material of the steel rail, the size of the cross section of the steel rail and the sound pressure intensity at a preset focusing depth position; determining the optimal scanning angle range of the first phased array probe based on the propagation velocity of the ultrasonic longitudinal wave in the wedge block and the steel rail, the propagation velocity of the ultrasonic transverse wave in the steel rail and the Snell's law; and controlling the first phased array probe to carry out sector scanning imaging within the optimal scanning angle range, and controlling the second phased array probe to carry out zero-degree line scanning imaging, so as to detect the full section of the welding seam. According to the invention, the welding seam can be accurately detected without dismounting the clamping plate.

The invention discloses an ultrasonic orthogonal scanning measurement method for mechanical properties of a fiber reinforced composite material. The method comprises the following steps: aiming at a composite material unidirectional plate to be detected, fixing receiving (transmitting) points on the surface of one side of a material, positioning the transmitting (receiving) points on the surface of the other side of the material, performing linear scanning along any two orthogonal directions, and recording transmission quasi longitudinal wave and quasi transverse wave time domain waveform signals which are acquired by combining each pair of transmitting and receiving points and are propagated along different paths; establishing an acoustic model for quantitatively describing the quantitative relationship between the ultrasonic trend and the independent elastic constant, thickness and fiber direction angle of the to-be-tested fiber reinforced resin matrix composite so as to simulate an ultrasonic data acquisition experiment and generate a corresponding simulated ultrasonic data set; and updating the independent elastic constant, the thickness and the fiber direction angle value of the composite material by taking the similarity degree between ultrasonic data sets obtained by experiments and simulation as a target function. According to the invention, multi-parameter high-precision in-situ nondestructive measurement of mechanical properties, thickness and fiber orientation of materials can be synchronously realized.

The invention provides an azimuth transverse wave remote detection data processing method, system and device and a medium. The method comprises the steps that an instrument is adopted to collect novel four-component transverse wave data (xx, xy, yx and yy) of a target well section; under a coordinate system (x, y) of the instrument, synthesizing an XX reflected wave signal with an angle defined relative to the x-axis direction of the instrument by using the orthogonal dipole four-component reflected signal, and defining the XX reflected wave signal as an angle when the reflected wave signal reaches the maximum amplitude; obtaining two cross component signals xy and yx by using novel four-component shear wave data (xx, xy, yx and yy), performing sliding windowing on the cross component signals xy and yx, performing Fourier transform on the signals in the window to obtain phase spectrums, and comparing the phase spectrums of the two cross component signals to obtain an actual phase difference; according to a novel four-component data combination mode, changing the orientation of the reflector, theoretically calculating the theoretical phase difference between the two cross component signals xy and yx, and establishing a rule chart of the cross component signals along with the orientation change of the reflector outside the well based on the theoretical phase difference; and judging the real azimuth angle of the reflector according to the rule plate.

The invention discloses a loess collapsibility evaluation method and system based on a geophysical prospecting test technology, and relates to the field of land exploration, and the method comprises the steps: laying regular detection grids in a to-be-evaluated loess site, and constructing a site geographic coordinate system; collecting Rayleigh wave signals in real time, inverting a transverse wave velocity profile, and collecting apparent resistivity data; a shallow soil sample is drilled, soil property parameters are measured, and a model is constructed according to the mapping relation between the field geophysical prospecting parameters and the soil property parameters; inputting the acquired data into the wave velocity-water content correlation model and the resistivity-dry density correlation model to generate a water content distribution field and a dry density distribution field; and calculating the collapsibility of loess in each detection grid based on a geophysical prospecting response equation of the collapsibility coefficient, outputting a collapsibility coefficient contour cloud picture, and judging the collapsibility grade of each grid and the distribution range of collapsed loess. The method has the advantages that the collapsibility distribution field and the contour cloud picture are generated through accurate non-intrusive data acquisition and model analysis, and a scientific basis is provided for engineering construction.

The invention discloses a seismic data acquisition device based on a ground 3C-DAS optical cable and an acquisition method thereof, is applied to the field of seismic exploration, and aims to solve the problems of high layout cost, too long construction time and low operation efficiency of an existing ground three-component detector. According to the method, a 3C-DAS armored optical cable is buried under a shallow earth surface in a parallel or orthogonal mode, a ground multichannel low-frequency DAS modulation-demodulation instrument collects phase data of Rayleigh scattering light reflected back from the 3C-DAS armored optical cable and carries out modulation-demodulation processing, and high-density distributed three-component seismic data distributed along the 3C-DAS armored optical cable is obtained; according to the system, high-density distributed three-component ground seismic data along the armored optical cable can be rapidly and efficiently acquired at low cost; the invention also provides a processing method for the collected high-density distributed three-component ground seismic data, an analysis method for a shallow surface velocity structure with high spatial resolution, and an inversion imaging method for longitudinal waves, transverse waves and surface waves.

The embodiment of the invention provides a simple system for simulating fluctuating motion of ocean conditions, and relates to the field of ocean-related simulation experiments. The device comprises a base, a translation seat, a stand column, a top beam, a lifting seat, a simulation water tank and a transverse vibration mechanism, the translation seat is installed on the base, the stand column is installed on the translation seat, the top beam is installed at the top end of the stand column, the lifting seat is installed on the stand column in a sliding mode, and the simulation water tank is installed on the lifting seat; the translation seat is mounted on the base through a transverse vibration mechanism, and the transverse vibration mechanism can enable the translation seat to do transverse reciprocating motion. Transverse waves can be generated, and corresponding wave fluctuation can be simulated; meanwhile, longitudinal waves can be generated, so that wave fluctuation generated by the longitudinal waves is simulated; the equipment has the two capabilities at the same time, can be selected according to requirements, and is high in universality. In addition, the device can enable the liquid to quickly recover calm, facilitates the switching of different seismic source modes for simulation testing, and improves the efficiency.

The invention relates to the technical field of industrial detection, in particular to an electromagnetic ultrasonic double-wave transducer for detecting residual stress of a pipeline. The problems that in the prior art, single-wave detection errors are large, the fitting degree of a sensor and a pipeline curved surface is poor, and impact force affects an internal structure are solved. The invention provides an electromagnetic ultrasonic double-wave transducer. The electromagnetic ultrasonic double-wave transducer comprises a shell, a magnet assembly, a coil and other components. The magnet assembly is composed of a transversely-arranged first magnet, a longitudinally-symmetrical second magnet and a longitudinally-symmetrical third magnet, the included angle between the magnets is adjusted through a hinge, and vertical and horizontal magnetic fields are formed to excite transverse waves and longitudinal waves at the same time. The lower portion of the shell is arc-shaped and attached to the curved surface of the pipeline, and an elastic supporting structure and a flexible buffering layer are arranged at the joint to buffer impact force. In addition, a grounding lead is arranged to improve the signal-to-noise ratio. Through multi-magnet combination, the arc-shaped shell and the grounding wire buffer design, the magnetic field uniformity and the detection signal strength are effectively improved, and transverse and longitudinal wave integrated high-precision residual stress detection is realized.

The invention discloses a steel rail stress measuring system based on electromagnetic ultrasonic orthogonal transverse waves. The steel rail stress measuring system comprises an electromagnetic ultrasonic probe and a signal processing unit, the electromagnetic ultrasonic probe is configured to be an orthogonal coil group with orthogonal axes, the electromagnetic ultrasonic probe generates eddy current under the excitation of alternating current and generates a first transverse wave and a second transverse wave on the steel rail, the propagation directions of the first transverse wave and the second transverse wave are both vertically downward from the center of a rail head of the steel rail, the vibration direction of the first transverse wave is the length direction of the steel rail, and the vibration direction of the second transverse wave is the length direction of the steel rail; the vibration direction of the second transverse wave is the width direction of the steel rail head, and the vibration direction of the first transverse wave and the vibration direction of the second transverse wave are perpendicular to each other to form an orthogonal relation; and the signal processing unit is used for synchronously receiving echo signals of the first transverse wave and the second transverse wave, calculating a propagation time difference between the first transverse wave in the length vibration direction and the second transverse wave in the width vibration direction, and evaluating the axial stress of the steel rail according to the propagation time difference between the first transverse wave and the second transverse wave.

The embodiment of the specification discloses a self-adaptive variable grid forward modeling method for middle-deep dry hot rock mass. p , a transverse wave velocity V s and a medium density p model, pre-setting forward modeling parameters; performing self-adaptive variable grid processing on the velocity model, determining a mapping relationship between coordinate systems, and determining a wave equation under variable grid based on the mapping relationship; performing self-adaptive variable grid processing on the velocity model, determining a mapping relationship between coordinate systems, obtaining the underground medium longitudinal wave velocity, transverse wave velocity and density after variable grid, determining a wave equation under variable grid based on the mapping relationship, and generating final regular grid horizontal direction longitudinal wave field, horizontal direction transverse wave field, vertical direction longitudinal wave field and vertical direction transverse wave field information by using the mapping relationship reversely according to the wave field information in each direction at a specific moment after the variable grid, so that the memory occupation is small and the calculation speed is faster.

The invention relates to the technical field of stress detection, in particular to an acoustic nondestructive testing method and system for bolt tightness, and the method comprises the following steps: transmitting longitudinal waves and transverse waves to a bolt without pretightening force, and calculating the propagation time ratio M of the longitudinal waves and the transverse waves in the bolt without pretightening force under the environment temperature change condition; transmitting longitudinal waves and transverse waves to the bolt with the pre-tightening force, and calculating the propagation time TP and TS of the longitudinal waves and the transverse waves in the bolt with the pre-tightening force under the environment temperature change condition; and calculating the stress sigma of the bolt according to the propagation time ratio M of the longitudinal wave and the transverse wave in the bolt without the pre-tightening force, the propagation time TP and TS of the longitudinal wave and the transverse wave in the bolt with the pre-tightening force and the effective clamping distance of the bolt under the environment temperature change condition. According to the invention, signal interference caused by temperature change and processing errors can be overcome, and the detection precision of the bolt stress is obviously improved.

The invention discloses a floater array and lever fulcrum adjustable bidirectional wave energy collecting device, and belongs to the technical field of wave energy power generation. The device comprises a carrying platform, an energy capturing device, a lever conversion device and a wave energy conversion device. The energy capturing device is hinged to one end of the lever conversion device through a multi-direction rotating mechanism and comprises a floater array mounting disc and a plurality of gyro type floaters detachably mounted on different sites of the floater array mounting disc, and an adjustable array is formed. The lever fulcrum position of the lever conversion device is adjustably installed on the carrying platform, and the other end of the lever conversion device is in transmission connection with a pull rod of the wave energy conversion device. The wave energy conversion device is of a low-friction sliding sealing ring and guide ring structure. Different wave conditions are adaptively matched through an adjustable floater array and a lever fulcrum, and longitudinal and transverse wave energy is captured by utilizing a lever conversion device and an independent hydraulic cylinder driving mechanism; through a low-friction sealing structure and a guide ring, the mechanical loss is obviously reduced, and the energy conversion efficiency is improved; the device is especially suitable for a low-energy-density wave environment, and the energy capture and conversion efficiency is remarkably improved.

The invention discloses a tight sandstone shear wave prediction method based on a fluid saturation dual fracture coupling model, and relates to the technical field of earth exploration physics. According to the method, a saturated rock physical model containing two groups of vertical orthogonal fracture fluids is constructed based on a Chapman multi-scale fracture medium theory framework, and an inter-fracture fluid mass distribution function is introduced to construct a dual-fracture coupling model based on fluid saturation. According to the method, conventional logging information is used as prior information, a rock physical model is used as a drive, an actual longitudinal wave speed and a simulated transverse wave speed are used as nested constraint conditions, a transverse wave speed prediction objective function is constructed, the tight sandstone transverse wave speed and the reservoir multi-group fracture density are estimated, a simulated annealing particle swarm optimization algorithm is introduced, and the reservoir multi-group fracture density is predicted. And the global optimization capability and the local convergence efficiency are enhanced. According to the method, the shear wave velocity prediction error can be effectively reduced, meanwhile, reservoir microstructure parameters are provided, and effective support is provided for reservoir fluid property judgment, lithology accurate recognition and underground fracture system quantitative description.

The invention discloses an ultrasonic double-wave detection and monitoring method and an ultrasonic double-wave transducer, and the ultrasonic double-wave transducer comprises a piezoelectric element which is used for exciting a longitudinal wave signal and a transverse wave signal at the same time under the excitation of a single electric pulse; the backing layer is positioned on the back surface of the piezoelectric element and is used for absorbing longitudinal wave energy radiated to the back surface by the piezoelectric element; the matching layer is arranged between the piezoelectric element and the tested workpiece and is used for acoustic impedance matching; the electrical connection device is used for connecting an external excitation generator and receiving equipment; and the metal shell is used for packaging the piezoelectric element, the backing layer, the matching layer and the electrical connection device and is provided with a structure for applying pre-tightening force. According to the invention, dual-mode excitation is realized through a single piezoelectric plate structure, and the efficiency, precision and reliability of dual-wave ultrasonic detection are improved.

The invention relates to the technical field of underwater low-frequency sound insulation superstructures, and discloses a pressure-resistant underwater low-frequency sound insulation superstructure based on a TPMS (Tire Pressure Monitor System) and a design method thereof, a two-dimensional section cell is intercepted and obtained on a Gyandroid lattice cell model along a sound wave incidence direction, and the characteristic that the modulus in the sound wave incidence direction is reduced and is easy to deform is utilized, so that the sound insulation performance of the sound insulation superstructure is improved, and the sound insulation performance of the sound insulation superstructure is improved. Low impedance is realized; the internal structure distribution of the cells is changed through stretching, so that the cells have anisotropy, the modulus of the cells in the sound wave incidence direction is reduced, and the impedance is further reduced; by introducing a material main shaft deflection angle, quasi longitudinal waves and quasi transverse waves in the structure are excited, and the longitudinal waves incident in water are converted into transverse waves in the structure through longitudinal-transverse wave conversion, so that the sound insulation performance is improved; performing periodic array arrangement, intercepting to obtain a core layer configuration under a two-dimensional plane, and performing structure materialization to obtain a sound insulation layer; the two sides of the sound insulation layer are covered with cover plates, and the pressure-resistant underwater low-frequency sound insulation superstructure based on the TPMS is obtained.

The invention relates to the technical field of ultrasonic stress measurement, and discloses an ultrasonic axial force high-speed real-time measurement system which comprises a core processor module which controls a transducer to alternately transmit and receive longitudinal wave and transverse wave echo signals and calls a fingerprint template established based on a geometric structure of a bolt to perform cross-correlation operation so as to determine transit time, according to the method, by constructing the acoustic characteristic normalization ratio, the influence of uniform temperature change is inhibited on the aspect of the measurement principle, and the inherent problems of model misalignment and error amplification in a traditional compensation mode are avoided; echo positioning is carried out by using geometric fingerprints of the bolt, a filtering algorithm with high calculation amount is replaced, the reliability of the system is improved, and high-precision measurement can be realized on a low-power-consumption general processor.

The invention discloses a resonator and a filter, and belongs to the technical field of resonators. The resonator comprises a supporting layer, a piezoelectric layer, an interdigital transducer and a first thickening part, the interdigital transducer comprises a first true finger electrode, a first false finger electrode, a second true finger electrode and a second false finger electrode, the first true finger electrode and the second false finger electrode are oppositely arranged to form a first gap, and the second true finger electrode and the first false finger electrode are oppositely arranged to form a second gap. Forming a second gap; the orthographic projection of the first thickening part on the piezoelectric layer is located in the orthographic projection of the first gap on the piezoelectric layer, and / or the orthographic projection of the first thickening part on the piezoelectric layer is located in the orthographic projection of the second gap on the piezoelectric layer; the first thickened portion is spaced apart from the true finger electrode and the false finger electrode. The first thickening parts are arranged in the gaps of the finger strip ends of the interdigital transducer, transverse waves generated by the resonator can be reflected back to the crossed area of the true finger electrodes, transverse wave mode suppression is achieved, and the Q value of the resonator is increased.

The invention relates to the technical field of coal reservoir development, in particular to a well-seismic data collaborative inversion and reservoir prediction method based on a rock physical model. The method comprises the following steps: acquiring well logging data and seismic data of a target reservoir, preprocessing the data, and ensuring the matching consistency of the data in time and depth; a dynamic rock physical model is constructed, reservoir heterogeneity parameters are introduced into the model, and the heterogeneity parameters are represented through rock core experiments or reservoir physical property analysis and used for describing the dynamic relation between the porosity, the permeability and the water saturation and the elastic parameters; on the basis of the dynamic rock physical model, well logging constraint and seismic reflection information in a well are jointly optimized by adopting an adaptive collaborative inversion algorithm to obtain three-dimensional distribution of longitudinal wave velocity, transverse wave velocity and density; by introducing a dynamic rock physical model, an adaptive collaborative inversion algorithm and a multi-scale convolutional neural network and combining well-seismic data joint processing, the prediction precision and resolution of reservoir physical properties can be improved.

The invention discloses a viscoelastic wave reverse time migration imaging method based on finite difference algorithm solution, and the method comprises the steps: S1, combining with the complex modulus of a constant Q model, and deriving a viscoelastic wave attenuation equation suitable for finite difference algorithm solution through introducing weighting function approximation; s2, establishing a viscoelastic wave compensation equation by introducing a compensation item for compensating energy attenuation when seismic waves are propagated in a viscoelastic medium, and combining the wave field compensation item with low-pass filtering for calculation to realize stable compensation of a wave field; s3, performing longitudinal and transverse wave field separation on the seismic source wave field and the detector wave field; s4, applying a seismic source normalization cross-correlation imaging condition to the separated wave field to obtain an attenuation compensation reverse time migration imaging result; and S5, setting a seismic wave excitation source and a signal receiving device for wave field data acquisition. The method provided by the invention can effectively improve the precision and resolution of seismic imaging in the viscous medium.

A seismic energy estimation method based on generalized spherical wave propagation, relating to the field of earthquake engineering. The method comprises: determining initial seismic total energy and seismic power on the basis of seismic source characteristics and a seismic magnitude; determining a generalized spherical wave equation, and calculating an average energy flow density of propagated waves on the basis of the wave equation of spherical waves; using an earth surface spherical crown, which is projected on the zone of a seismic source surface, as a main impact zone of seismic spherical waves on an earth surface, the main impact zone being equivalent to a square and performing grid division, and calculating the hypocentral distance between the center of each grid and the center of a seismic source so as to form a hypocentral distance matrix; and expressing the generalized spherical wave energy flow density of each grid as the sum of the energy flow density of longitudinal waves and the energy flow density of transverse waves, performing grid subdivision, estimating the average amplitude of each subdivided grid mass unit within a seismic action period, and evaluating the seismic action energy of a site. The present invention estimates the action of seismic energy on the earth surface by defining the generalized spherical wave propagation of seismic source energy, thereby more accurately evaluating the distribution condition of seismic energy on the earth surface.

The present invention discloses a method, system, device and medium for intelligent prediction of low-velocity mudstone, including: calibrating the target layer by combining well logging data, and dividing the layer into background mudstone, low-velocity mudstone, gas-bearing sandstone and dry-layer sandstone. Based on the division results, a large number of datasets for neural network training are generated through geological body evolution. A convolutional neural network (CNN) is constructed, and the input data is normalized to prevent gradient explosion. By training the model, an optimized neural network model is obtained. Using the AVO prestack inversion technology, the longitudinal and transverse wave velocities and density parameters are extracted from the prestack seismic data to assist in the identification of low-velocity mudstone. The processed data is input into the trained model to achieve intelligent prediction of low-velocity mudstone. The present invention can effectively improve the identification accuracy of medium-deep reservoirs, avoid misjudgment caused by the "bright spot trap" of low-velocity mudstone, and provide reliable technical support for oil and gas exploration.

The invention provides a crack prediction method and device based on seismic data, and the method comprises the steps: dividing the seismic data into a plurality of fan-shaped regions according to a shot point and a detector azimuth angle, and determining an azimuth domain common imaging gather of a converted wave in each fan-shaped region; carrying out fast and slow shear wave separation on the orientation domain common imaging gather, and determining a fast shear wave gather, a slow shear wave gather and an included angle between the crack trend in each stratum crack and the main measuring line direction of the detector; according to the fast transverse wave gather and the slow transverse wave gather, the development direction of the crack of the target stratum is determined; converting the azimuth domain common imaging gathers corresponding to the fast transverse waves and the slow transverse waves into snail gathers according to the azimuth and offset of the fan-shaped region, and correcting the time difference of each gather in the snail gathers; and determining the density of the crack based on the time difference, and determining the development index of the crack according to the density.

The invention discloses a three-dimensional wave flow test harbor basin system, relates to the field of ocean infrastructure engineering test equipment, and aims to solve the problem that complex ocean conditions cannot be truly reproduced. The system comprises a wave making pool, a current making mechanism, a wave making mechanism, a wave absorbing mechanism and a crane mechanism, the flow making mechanism comprises a flow making pump, a flow outlet, a flow inlet and a circulation corridor, the flow outlet and the flow inlet are both communicated with the wave making pool and the circulation corridor, and the flow making pump and the circulation corridor are both located below the wave making pool; the wave making mechanism comprises a transverse wave making device and a longitudinal wave making device which are mounted in the wave making pool, the transverse wave making device and the longitudinal wave making device are respectively provided with an upper layer and a lower layer, and the transverse wave making device and the longitudinal wave making device are vertically arranged; the wave absorbing mechanism is circumferentially arranged and is adjacent to the inner side wall of the wave making pool; the crane mechanism stretches across the wave making pool and is used for hoisting an experimental model.

The invention provides a phase change blasting excitation seismic wave reflection method, a medium, equipment and a product, and relates to the technical field of tunnel engineering, the method comprises the following steps: arranging a detection hole and a plurality of blasting holes in a tunnel face, placing blasting tubes in the blasting holes, placing detectors in the detection hole, and generating seismic waves through phase change blasting; carrying out longitudinal wave and transverse wave separation on seismic wave signals detected by a detector, processing longitudinal waves and transverse waves by adopting a two-dimensional F-K digital filtering method, filtering interference waves, separating effective waves and direct waves, and dividing a data set of the effective waves into a training set and a test set; building a prediction model of the unfavorable geological disaster body in front of the tunnel face based on a support vector machine, and obtaining optimal parameters of the model by using a particle swarm algorithm; and training and testing the model by using the training set and the test set, and applying the tested model to tunnel geological forecast. According to the method, the accuracy of advanced geological forecast of the gas tunnel is improved, and the gas explosion risk is reduced.

The invention relates to the technical field of elastic waves, and discloses an elastic wave full-waveform inversion method, which comprises the steps of inputting observed seismic data into a preset neural network encoder, and extracting to obtain high-dimensional feature representation; inputting the high-dimensional feature representation into a preset neural network decoder to obtain a gradient update value; obtaining an elastic parameter model based on the gradient update value and the initial elastic parameter model; obtaining Lame parameters based on the longitudinal wave velocity, the transverse wave velocity and the medium density; based on a Lame parameter and an elastic wave equation, obtaining synthetic seismic data; obtaining an objective function based on the observed seismic data and the synthesized seismic data; using the target function to iteratively update the preset neural network weight until the loss function reaches a first preset threshold value or the number of iterations reaches a second preset threshold value, and obtaining a target gradient update value; and based on the target gradient update value and the target elastic parameter model, obtaining a final target elastic parameter model so as to relieve discomfort caused by simultaneous inversion of multiple elastic parameters.

The invention relates to the technical field of roadbed detection, and discloses a roadbed compaction quality detection method based on ultrasonic wave collaboration, and the roadbed compaction quality detection method comprises the following steps: collecting full-wave band ultrasonic echo signals, and obtaining current environment data; calculating a longitudinal wave speed, a transverse wave speed and a wave speed ratio, and extracting an attenuation coefficient and a frequency dispersion characteristic of the ultrasonic echo signal to obtain an acoustic characteristic set; inputting the acoustic feature set and the environmental data into an environmental compensation model, outputting a standard acoustic parameter set subjected to temperature, humidity and water content correction, analyzing the standard acoustic parameter set through a soil texture classification algorithm, and judging the current soil texture type; and combining the standard acoustic parameter set and the current soil texture type into a multi-dimensional feature vector, inputting the multi-dimensional feature vector into a compactness calculation model, and calculating to obtain a roadbed compactness value of the current measuring point. According to the method, high-precision compaction degree numerical calculation is realized, and intelligent and visual whole-process support is provided for roadbed construction quality.

The invention discloses a karst detection method based on blasting seismic wave component analysis. According to the method, based on the propagation characteristics of shear waves (transverse waves and S waves) in fluid, a blasting seismic source generated in the tunnel excavation process is used as an active signal source, existence of a karst cave area is preliminarily judged through multi-point synchronous monitoring and analysis of S wave energy proportion changes, arrival time difference, energy distribution and the like of P waves and S waves are analyzed according to the karst cave area, and the karst cave area is determined. The method achieves the recognition and judgment of the spatial distribution characteristics (including the position and the scale) of the karst cave, and finally obtains the specific moisture content of the karst cave in combination with a related theoretical calculation result, thereby achieving the accurate detection of the characteristics of the karst cave in a detection region. According to the method, an excitation source does not need to be additionally arranged, the detection process and conventional blasting construction can be carried out synchronously, and the method has the advantages of being few in measuring point arrangement, easy and convenient to implement, high in efficiency, accurate, small in calculation workload and the like and is suitable for karst detection and geological disaster early warning in the blasting construction period of tunnels such as water conservancy projects and traffic tunnels.

The application belongs to the technical field of tunnel geological advanced prediction, and provides an electromagnetic controllable excitation device and method for longitudinal and transverse wave excitation of a deep-buried tunnel. The excitation device comprises a body, longitudinal and transverse wave excitation plates arranged on the body, and a rotating mechanism arranged on the body. The longitudinal and transverse wave excitation plates are perpendicular to each other, and the rotating mechanism is connected with a mechanical arm. The rotating mechanism is used to realize the operation switching of the longitudinal and transverse wave excitation plates at the same physical position, and longitudinal and transverse wave excitation is performed. The longitudinal and transverse wave excitation functions are integrated in a single excitation device, the structure is compact, and the device is suitable for operation requirements in a narrow space area in a tunnel. The rotating mechanism is used to realize 90-degree rapid switching, the detection efficiency is greatly improved, the physical positions of two times of excitation are completely consistent, and the data comparability is improved.