24 results about "Internal fracture" patented technology

The invention belongs to the technical field of image data processing, and particularly relates to an automatic evaluation method and system for the metallographic spheroidization rate of a casting, and the method comprises the steps: constructing a global gradient field of a metallographic image of the casting; calculating a centripetal index by using a negative gradient vector and positioning a graphite particle physical center; determining a physical boundary based on the ratio of the tangential slip amount to the radial projection intensity on the ray path; obtaining a compactness index based on the consistency of the internal negative gradient vector and the radial direction; and the spheroidization score is calculated by combining the contour roundness and the compactness index, and the spheroidization rate is counted and output. According to the method, the problem that the internal crushing defect cannot be identified by the existing geometric scalar method is solved, and dual evaluation on the morphology and compactness of the graphite particles is realized.

The invention provides a visual characterization method, device and equipment for a deformation rule of a rock microstructure, and relates to the technical field of oil-gas exploration. The method comprises the following steps: acquiring scanning grey-scale map data of an internal structure of a rock under different load conditions; establishing a rock three-dimensional digital core model under different load conditions according to the scanned grey-scale map data and the pre-trained neural network; performing pore structure feature extraction processing according to the rock three-dimensional digital core model to obtain rock pore structure feature parameters, and representing a dynamic deformation rule of the rock micro-pore structure along with effective stress loading according to the rock pore structure feature parameters; performing fracture morphological feature extraction processing according to the rock three-dimensional digital core model to obtain a rock fracture morphological feature parameter system, and representing a rock internal fracture morphological deformation evolution rule according to the rock fracture morphological feature parameter system. According to the method provided by the invention, the real rock micro-pore structure is accurately reflected.

The invention relates to the technical field of biological erosion detection, and discloses an internal fracture characteristic evaluation method based on surface fracture distribution, and the method comprises the steps: generating a three-dimensional initial roughness model; generating a fracture erosion surface feature distribution model; and calculating the biological erosion fractal dimension by adopting a fractal geometry method, and identifying the biological erosion mode of the fracture in combination with a permeability calculation result. Compared with the prior art that the identification means for the rock mass fracture biological erosion mode is rough, and especially in a complex environment such as a high-humidity or high-biological-activity area, the technical problem that accurate identification for the erosion mode cannot be achieved is solved, due to the fact that the multi-parameter model combining the fractal geometric method and the permeability is introduced, the identification accuracy of the rock mass fracture biological erosion mode is improved, and the identification accuracy of the rock mass fracture biological erosion mode is improved. According to the method, the erosion depth, roughness and fractal dimension features of the fracture surface are quantified, and accurate classification of fracture erosion modes is realized, so that the problem of inaccurate identification in the prior art is avoided, and the identification precision and reliability of fracture biological erosion are improved.

The invention discloses modeling of a three-dimensional rock mesoscopic model capable of controlling the shape of an internal fissure surface. The modeling comprises the following steps: pre-establishing a three-dimensional model space with a certain size; randomly arranging nucleation points according to certain distance parameters in the space area of the three-dimensional model; generating a Voronoi model by taking any nucleating point as a center; the generated Voronoi model is cut, only hole walls between polyhedrons are reserved, and the shape of a fracture surface is controlled through selective deletion; and filling the remaining part in the three-dimensional model space. The method can truly reflect the morphological structure of the fissure surface in the rock, and directly realizes the morphological control of the fissure surface based on the random selection of the hole walls among the polyhedrons. The problems that in the current three-dimensional microscopic modeling process of the fractured rock, the fracture surface form cannot be truly reflected, and the fracture surface is difficult to control during generation are solved, parameterized modeling of the fractured rock is achieved, and a basis is provided for analyzing the influence of the internal fracture structure of the rock on the macromechanical property of the rock and a microscopic failure model.

The invention relates to the technical field of rock mass mechanical property detection and stability evaluation, and discloses a rock mass stability quantitative evaluation method based on disturbance stress and fracture evolution, and the method comprises the steps: collecting the amplitude spectrum of a target rock mass; monitoring and separating internal fracture sound of the target rock mass to obtain fracture frequency; performing amplitude interference analysis on the target rock mass based on the amplitude spectrum and the fracture frequency to obtain a vibration interference factor of the target rock mass; and performing humidity compensation on the vibration interference factor based on the humidity degree in the target rock mass to obtain an environment compensation factor of the target rock mass, predicting the fracture state of the target rock mass based on the environment compensation factor and the inherent strength parameter of the target rock mass, and generating a stability evaluation report of the target rock mass based on the fracture state. According to the method, the problems that in existing rock mass stability evaluation, disturbance stress and fracture evolution dynamic association is not effectively combined, environmental interference is neglected, strength verification is lacked, and evaluation accuracy and reliability are insufficient can be solved.

A distributed ultrasonic monitoring system for an internal fracture process of an ultra-large three-dimensional geological model includes a high-power ultrasonic phase control apparatus, ultrasonic transmitting and receiving integrated sensors, and measurement and control and three-dimensional ultrasonic imaging software. A geometric asymmetric monitoring layout mode is adopted to form a three-dimensional monitoring grid. The sensors are coupled with the three-dimensional geological model using a pre-embedded manner, the sensors according to sequential numbers are connected to the high-power ultrasonic phase control apparatus, and the sensors of each chain sensor array are excited one by one according to a pre-set delay time; and the three-dimensional ultrasonic imaging software inverts and analyzes a three-dimensional wave velocity field of the monitoring areas according to a relationship of echoes, transmission wave signals and the three-dimensional grid, and reflects rock fracture positions and degrees through changes in the wave velocity field.

The invention relates to a method for inverting internal fracture parameters of a rock mass based on a ground penetrating radar image. The method comprises the following steps: acquiring the ground penetrating radar image of the rock mass; based on the ground penetrating radar B-scan image, through a CNN-based image identification model, identifying a crack on the image as one of preset crack distribution forms; and based on the distribution form of the fracture, determining a geometric parameter type corresponding to the distribution form, and inverting the geometric parameter of the corresponding type of the fracture in combination with the image feature I of the ground penetrating radar B-scan image and the image feature II of the ground penetrating radar A-scan image. According to the method, the distribution form of the fracture on the image is identified based on the B-scan image, then the parameter type corresponding to the fracture distribution form is determined, the geometric parameters of the corresponding type of the fracture are inverted in combination with the image features on the B-scan image and the A-scan image of the ground penetrating radar, and then the length, the inclination angle, the position parameters and the like of the fracture are determined. And a more reliable basis is provided for rock mass stability analysis. The method is suitable for the field of rock mass fracture detection.

This invention relates to the technical field of deep well mining, and particularly to a real-time analysis and early warning method for true triaxial hydraulic fracturing test data. The method includes the following steps: acquiring multi-source monitoring data during the true triaxial hydraulic fracturing test, wherein the multi-source monitoring data includes mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; assigning verification weights matching the test conditions based on the heterogeneous attributes of the mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; and verifying the acquisition timestamps and range matching of each data point using the verification weights to generate a standard dataset. The real-time analysis and early warning method for true triaxial hydraulic fracturing test data provided by this invention can simultaneously capture the stress field, fluid transport, deformation state, and internal fracture evolution characteristics of rock samples, improving the comprehensiveness of rock sample condition characterization and solving the problem of one-sided condition perception.

The invention provides a combined fracture internal fixing device which comprises a fixing rod and a plurality of sets of sliding fixing pieces installed on the fixing rod in a sliding mode, torsion locking pieces are rotatably installed above the sliding fixing pieces, an upper half clamping cover is installed on one side of each torsion locking piece in a sliding mode, and a lower half clamping cover is installed on the other side of each torsion locking piece. The torsion locking piece is used for twisting the using direction of the upper half clamping cover, and the upper half clamping cover is used for eliminating installation deviation of surgical screws in a matched mode. The device can adapt to more operation schemes and can match differences caused by partial bone difference factors so as to solve the problems that an existing screw mounting hole site is often fixed in advance and cannot be adjusted, due to factors such as fracture parts and types of different patients and bone individual differences, the design of the fixing hole site is often difficult to accurately adapt, and the fixing hole site is difficult to adjust. And even a secondary operation is needed to adjust the fixing mode.

The invention discloses a dangerous rock mass fracture dynamic tracking method based on magnetic-visual bimodal fusion. The method comprises the following steps: preparing a magnetic fluid; a magnetic induction monitoring module is arranged on one side of the dangerous rock body; a visual monitoring module is installed on the rock mass opposite to the dangerous rock mass; pouring the magnetic fluid into a crack on one side of the dangerous rock body; and monitoring the dynamic expansion condition of the crack. According to the dangerous rock mass fracture dynamic tracking method based on magnetic-visual bimodal fusion, real-time, lossless and full-dimensional monitoring of the dynamic expansion path of the internal fracture of the dangerous rock mass can be realized.

The application discloses a kind of rock energy release effect evaluation method, comprising: taking multiple rock samples in the region to be measured;Take one of them to obtain its internal fracture degree, obtain the fracture development characteristic value P1 before drop hammer test;Setting counterweight and contact speed carries out drop hammer test and is observed with high-speed camera;Obtain the fracture development characteristic value P2 of sample after drop hammer test, according to P2 and P1 obtains fracture development characteristic value variation ΔP;Replace sample and repeat the above steps, adjust counterweight, contact speed each time drop hammer test, and the relationship between release amount and release speed and ΔP is fitted;Uniaxial compression test is carried out on complete rock sample to calculate its energy release amount and release speed, according to energy release amount, release speed combines curved surface diagram to obtain fracture development characteristic value variation ΔP, and energy release effect is evaluated.The application fully considers the speed of energy release, so as to more accurately reflect the impact tendency of surrounding rock.

The invention discloses a method and a system for determining the elastic modulus of an internal fixation block for fracture, and relates to the field of medical instruments, and the method comprises the following steps: building a parameterized biomechanical model, extracting features from the parameterized biomechanical model, and selecting the elastic modulus of the internal fixation block based on a gradient boosting decision tree model. An artificial intelligence algorithm combined with pathological state correction is used for accurately determining the elastic modulus required by the fracture internal fixation block, and the elastic modulus is creatively fused into the physiological state index of a patient to dynamically adjust the weight coefficient. Objective customization of personalized elastic modulus is achieved, it is ensured that the internal fixing block is highly matched with the bone mechanical property of a patient, stress conduction and distribution of a bone fixing interface are effectively optimized, the stress shielding risk is reduced to the maximum extent, fracture healing quality and speed are remarkably improved, complications are reduced, and fixing stability and long-term curative effect are improved. The system is a key breakthrough for intelligent and precise orthopaedic treatment.

The invention discloses a reservoir fracture evolution stage and pore permeability parameter collaborative characterization method which comprises the following steps: screening rock samples, and preparing two sets of samples A and B; carrying out a rock mechanics experiment on the sample A, and determining a rock stress-strain curve; determining a CT scanning point of the sample B according to the stress and strain curve; carrying out a rock mechanics experiment on the sample B, and carrying out CT scanning on corresponding scanning points; carrying out digital core modeling on a two-dimensional image obtained by CT scanning, and calculating the porosity and tortuosity of the rock in different fracture stages; based on a particle flow software PFC modeling method, determining a macroscopic structure evolution stage of the fold thrust belt; according to the macroscopic structure evolution stage and the strain size of the research area, combining digital core modeling, the reservoir fracture evolution stage and the porosity and permeability response; in the application, real-time monitoring of the internal fracture process of the rock can be achieved, meanwhile, efficient and lossless perspective of the morphology characteristics of the internal space structure of the sample is met, the fracture development process is revealed, and rock fracture visualization is achieved.

The invention provides a minimally invasive fixation method, system and terminal for tarsometatarsal joint internal fracture based on reinforcement learning, and the method comprises the steps: carrying out the preprocessing of collected tarsometatarsal joint three-dimensional CT data and real operation screw scanning point cloud data, and importing the obtained tarsometatarsal joint three-dimensional model data and operation screw three-dimensional model data into Unity; and acquiring a three-dimensional tarsometatarsal joint and a three-dimensional screw in the operation simulation scene, calculating an initial implantation point position of the three-dimensional screw and an implantation target area, and obtaining an optimal orientation for guiding the three-dimensional screw to be implanted so as to determine an optimal implantation path of the three-dimensional screw. The problem that in the prior art, the continuous three-dimensional structure characteristics of the fracture in the tarsometatarsal joint are ignored, and consequently the screw implantation path planning result is not accurate is solved. According to the method, the optimal implantation path of the screw-fixed tarsometatarsal joint internal fracture is found in the three-dimensional model on the basis of reinforcement learning in combination with a clinical experience design optimization algorithm, and the operation precision and safety are greatly improved in actual clinical application.

The application provides a goaf cross-medium seepage-stress-structure coupling experimental device and method, relates to the technical field of rock mass mechanics testing, and comprises a structure simulation system, a gradient force loading system and a tracing seepage system; goaf accumulation rock samples are coaxially stacked on in-situ rock layers, and the in-situ rock layers are configured to simulate the floor rock layer close to the coal seam in the real goaf and are internally provided with water outlet micro flow channels. The gradient force loading system is used for dynamically applying uniform or gradient distribution axial pressure and confining pressure to the rock sample. The tracing seepage system comprises a water storage tank containing seepage water with an isotopic tracer and multiple camera modules. The internal fracture structure characteristics of the rock sample are output through the transparent shell, the tracing signal generated by the isotopic tracer and the seepage images collected by the camera modules. The problems that the existing experimental structure cannot truly reproduce the seepage-stress-structure three-field coupling and cannot accurately realize the internal fracture three-dimensional visualization and quantitative characterization are solved.

The application discloses a coal body hydraulic fracturing fracture three-dimensional space network reconstruction and characterization method, which is based on real CT three-dimensional body data, can realize the transformation of fracture structure from geometric visualization to parameterization and evaluation, can directly reflect the real connection relationship of the fracture in the three-dimensional space by identifying and three-dimensionally reconstructing the internal fracture of the coal body before and after fracturing, avoids the connection misjudgment and scale deviation caused by two-dimensional slice inference, improves the authenticity of the evaluation result from the source, and simultaneously adopts skeletonization and node-edge modeling on the fracture network, converts the three-dimensional voxel fracture structure into a node-edge form fracture network model, significantly reduces the calculation complexity under the premise of ensuring the fracture space connection relationship, enables the connectivity and flow conductivity characteristics of the fracture network to be expressed in the form of unified parameters, and is especially suitable for the fracture network characterization of the laboratory true triaxial test and the digital coal rock sample data based on CT scanning.

The invention relates to the technical field of geotechnical engineering, and discloses a rock mass three-dimensional visualization and disaster early warning method based on velocity structure tomography. The method comprises the following steps: acquiring mechanical signals and fracture data of a rock mass under different load effects by utilizing devices such as acoustic emission monitoring and a split Hopkinson pressure bar, inverting the internal speed structure change of the rock mass by adopting a delay double-difference tomography technology, constructing a three-dimensional visual model of a rock mass fracture partition, and finally determining the fracture partition of the rock mass in combination with a rock mass fracture mechanism and a spatio-temporal evolution law. And establishing a disaster early warning mechanism. According to the invention, the problem that the traditional monitoring technology cannot accurately capture the crack extension and dynamic fracture partition in the rock mass in real time is solved, reliable technical support can be provided for rock mass stability evaluation and disaster prevention and control in the scenes of mining, tunnel engineering and the like, and the engineering safety and production efficiency are improved.

The invention discloses a preparation method of internal fractures of a cement sample based on magnetic powder and a magnetic suspension technology, and belongs to the technical field of manufacturing of rock-like material prefabricated fractures. The method comprises the following steps: preparing a crack template with a set shape by adopting a mixture of ice blocks and iron oxide powder; accurately suspending the crack template at a preset position in the mold by utilizing a magnetic suspension technology to avoid contacting with the inner wall of the mold; then cement grout is slowly poured into the mold till half of the crack formwork is immersed; after the slurry is initially set, stopping the magnetic suspension device, and pouring until the mold is filled with the slurry; and finally, the ice blocks are soaked in water to melt and carry out the iron oxide powder, and internal cracks are formed. The crack position is controlled through magnetic suspension, the error is small, residue interference is almost avoided, and the influence of fine cotton threads or 3D printing sheets on a mechanical test is reduced. The method is simple in structure, accurate in control and suitable for preparing internal hidden cracks of different shapes and sizes.

The invention discloses a grouting hole positioning method based on an internal crack characteristic trend. The method comprises the following steps: S1, acquiring internal structure information of a road structure; s2, data processing and map generation; S3, crack automatic identification and slice map export; s4, crack trend positioning based on plane coordinate conversion; and S5, grouting hole positioning. According to the positioning method, the real trend of the crack can be automatically recognized, the position of the internal crack is accurately positioned, it is ensured that the grouting holes are distributed along the crack, and the repairing precision is improved.

The utility model provides a bone fracture internal fixture scrap collecting device which comprises a first connecting rod, a second connecting rod, a rotating shaft, a first collecting part and a second collecting part, and the first connecting rod and the second connecting rod are located on the same horizontal plane and rotatably connected together through the rotating shaft. The first collecting part and the second collecting part are installed at one end of the first connecting rod and one end of the second connecting rod respectively, and the first collecting part and the second collecting part can be driven by the first connecting rod and the second connecting rod to be combined to form a scrap collecting groove. According to the metal scrap collecting device, all metal scraps can be collected, it is guaranteed that all the metal scraps do not make contact with a wound, and therefore relevant complications such as wound infection, osteomyelitis and wound non-healing caused by metal scrap residues and the fact that the metal scraps make contact with the wound are avoided.

The present invention provides a design method for a fracture internal fixation system based on bone morphology big data, which can complete the design of an overall solution for an internal fixation system for a specific bone part of a target population. The present invention is based on CT scan bone digitization data of a large sample of real cases, and based on verified three-dimensional measurement technology and measurement schemes, reliable and repeatable measurements are performed on a large sample of digitized cases, and internal fixation design is performed based on the obtained large sample anatomical morphological parameters. By establishing an image screening operation platform, a large sample matching degree detection can be performed on the designed internal fixation system in a relatively short time, and improvements can be made based on the matching results, saving a lot of economic and time costs.

The application provides a method for optimizing mixing ratio of temporary plugging agents with different particle sizes based on visualized experiment, which comprises the following steps: carrying out internal fracture temporary plugging experiment of temporary plugging agents with different particle sizes mixed in different ratios; calculating maximum length L of plugging layer, permeability K and fluctuation degree F of fracture flow channel at the position of plugging layer formed by temporary plugging agents with different particle sizes mixed in different ratios under the conditions of same temporary plugging agent dosage and concentration, carrying fluid viscosity and discharge capacity; calculating optimal index I, mixing mass ratio of temporary plugging agents with different particle sizes corresponding to the maximum optimal index I according to the maximum length L of plugging layer, permeability K and fluctuation degree F of fracture flow channel, and obtaining optimal result. The method has reliable principle, simple operation, can effectively optimize mixing ratio of temporary plugging agents with different particle sizes, improve internal fracture temporary plugging effect, and effectively supports the development of internal fracture temporary plugging technology of deep shale gas horizontal well fracturing.

This invention relates to the field of bio-erosion detection technology and discloses a method for evaluating internal fracture characteristics based on surface fracture distribution. The method includes: generating a three-dimensional initial roughness model; generating a fracture erosion surface feature distribution model; calculating the fractal dimension of bio-erosion using fractal geometry methods; and combining the permeability calculation results to identify the bio-erosion pattern of the fracture. Compared to existing technologies that rely on relatively coarse methods for identifying bio-erosion patterns in rock fractures, especially in complex environments such as high humidity or areas with high biological activity, this invention addresses the problem of inaccurate identification of erosion patterns by introducing a multi-parameter model combining fractal geometry methods and permeability. This model quantifies the erosion depth, roughness, and fractal dimension characteristics of the fracture surface, achieving accurate classification of fracture erosion patterns. This avoids the inaccurate identification problems of existing technologies and improves the accuracy and reliability of identifying bio-erosion in fractures.

The invention discloses an engineering test piece internal crack occurrence visualization method based on piezoelectric ceramics. The method comprises the following steps: uniformly arranging three groups of piezoelectric ceramic signal monitoring points on six surfaces of an engineering test piece; calculating the difference value of the peak values of the piezoelectric ceramic signals monitored at each position point before and after the blasting test, if the difference values of the three pairs of piezoelectric ceramic signals corresponding to one position point exceed a threshold value, determining that the position point has a crack and recording the position point as a crack point, and traversing all the position points to obtain all the crack points; fracture points are divided into different clusters by adopting a clustering analysis method, and then plane fitting is performed to obtain different fracture planes. According to the method, the cracks in the engineering test piece after the engineering blasting model test can be accurately identified, the occurrence of the cracks can be visualized, destructive operation does not need to be carried out on the engineering test piece of the engineering blasting model test, and therefore the method can be used for damage monitoring under the action of the cyclic blasting load.