9 results about "Internal fracture" patented technology

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.

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 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 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 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.