103 results about "Residual strength" patented technology

The invention provides a method for rapidly evaluating the residual strength of a damaged composite stiffened wallboard structure, which is applied to the evaluation of the residual strength of a composite stiffened wallboard in an undetectable area in an actual aircraft structure under possible accidental source damage, and comprises the following steps: (1) damage identification based on a piezoelectric sensing system; (2) carrying out damage equivalence on a damage identification result; (3) constructing a residual intensity database; (4) training a neural network model of the residual intensity database; and (5) quickly evaluating the residual strength of the actual damaged wallboard based on the sensing system and the neural network model. After a flight task of a flight product is completed, on the premise that database construction and model training are completed in the earlier stage of the ground, the method can greatly shorten the evaluation period of the residual strength performance of the composite material stiffened wall plate, and therefore the method serves for identifying the re-flight capacity of an aircraft.

The invention relates to an additive fatigue life and residual strength prediction method based on random defects, and the method comprises the steps: obtaining the specific features and random distribution forms of the defects, and focuses on the calculation of three defects, i.e., corner cracks, surface cracks and embedded cracks, which are liable to cause structural failure in an actual working condition; compared with a traditional continuous medium mechanical calculation method, the obtained fatigue life is more consistent with the dispersity of an actual fatigue life experiment result, compared with a common equivalent area projection method, the method generates defects in a panel where a critical failure plane is located during life calculation, higher design precision and reliability are achieved, and the method is suitable for large-scale popularization and application. The defect model and the calculation process are simplified, the operation is more convenient under the condition that the precision is close, and particularly, the calculation is faster when the calculation target is a large-scale structural member.

The invention discloses a method for analyzing the strength stability of a composite material wallboard, which comprises the following steps of: 1) carrying out a wallboard strength test on a wallboard structure of a T-shaped stringer disconnected at a rib position to obtain test data required in the method for analyzing the strength of the wallboard; 2) performing finite element simulation on the BVID damage with the lowest residual strength in the wallboard in the same configuration and same loading mode in the wallboard strength test; 3) based on the finite element simulation in the step 2), establishing a multi-configuration wallboard finite element model; and 4) based on the multi-configuration wallboard finite element model in the step 3), fitting to obtain a correction coefficient, and determining a strength stability analysis method.According to the method, the defects of a classical wallboard strength engineering algorithm in stringer support condition simulation, layering applicability, BVID damage and initial geometric defect influence are overcome.

The invention discloses a monitoring and strength measuring system for welding cracks, which comprises a monitoring unit, a data processing unit, a strength evaluation unit, a control unit and an output unit, and is characterized in that the monitoring unit is used for acquiring various physical parameters of crack formation and expansion of a welding joint in an operation process; the data processing unit preprocesses and analyzes the received physical parameters to generate crack state monitoring data; the strength evaluation unit dynamically evaluates the residual strength of the welding joint in combination with the mechanical property of the material; the control unit automatically adjusts welding process parameters, such as welding heat input, welding speed and cooling rate, according to crack monitoring data and strength evaluation information; the real-time monitoring and dynamic adjustment in the welding process are achieved by comprehensively monitoring crack propagation and evaluating the structural strength, the service life of a welding structure can be effectively prolonged, and the safety and reliability of the welding structure can be ensured.

The invention discloses a residual strength evaluation method, device and equipment of a gas compressor impeller, and relates to the technical field of data processing. The method comprises the steps that when it is detected that the compressor impeller has a crack defect, the defect size and the defect type of the crack defect are determined; wherein the defect type is a surface defect or an internal defect; calculating the defect area of the crack defect by using the defect size; determining a geometric correction factor corresponding to the defect type; and calculating the maximum residual strength of the compressor impeller by using a preset fatigue crack propagation threshold value, the defect area and the geometric correction factor. According to the method, the real operation condition of the compressor impeller can be accurately reflected, and the accuracy of the evaluation result of the residual strength of the compressor impeller is improved.

The invention provides an optimization design evaluation method for a labyrinth welding drum based on a parameterized model, and belongs to the technical field of aero-engines, and the method comprises the steps: building a drum parameterized mathematical model, and determining a drum stress expression; determining a dangerous part of the drum at the maximum working rotating speed, and determining the section average stress of the dangerous part based on the stress expression; aiming at the welding part, determining the residual strength reserve coefficient of the drum based on the initial defect, and determining the stress reserve coefficient of the welding part; for the maximum stress part, the ratio of the minimum self-sustaining radius of the two wheel discs connected with the drum to the pitch diameter of the drum is obtained; when the ratio does not meet the preset condition, the stress reserve coefficient of the maximum stress part is determined; and carrying out optimization design on the structural parameters of the drum by taking the lightest weight of the drum as an objective function and taking the condition that the residual strength reserve coefficient and the stress reserve coefficient do not exceed the material performance as a constraint condition. A complete evaluation system is established, the design period is shortened, and the evaluation accuracy is improved.

The application discloses a rock residual strength determination method based on an energy drop ratio parameter and belongs to the technical field of geological engineering. According to a rock stress-strain curve obtained through a rock triaxial test, the energy of each component in a failure process is calculated according to the rock stress-strain curve characteristics, and based on the energy evolution law in the rock failure process, an energy drop ratio parameter is proposed to quantitatively represent the strength drop. A residual strength determination method considering the whole rock failure process is proposed through the energy drop ratio parameter. The application comprehensively considers the influence of the pre-peak stage and the post-peak stage on the residual strength, proposes a rock residual strength determination method suitable for different post-peak drop trends, and calculates the stability of the broken rock mass through the residual strength, which has an important guiding role for the excavation, design and stability evaluation of the rock mass engineering.

The invention discloses a method for evaluating the residual strength of a multi-scale fiber-reinforced flexible pipe under a stretch-bending load, and relates to the technical field of structural strength evaluation of ocean engineering composite materials, and the method comprises the following steps: extracting fiber distribution characteristics by adopting digital image processing based on a scanning electron microscope image; a Monte Carlo method is combined to construct a two-dimensional RVE geometric model of the fiber reinforced structure containing the damp-heat degradation, and macroscopic elastic parameters are predicted; a VUMAT user material subprogram containing dynamic damage is written based on Fortran, damage starting and evolution failure criteria of a fiber reinforced structure are embedded, and the nonlinear coupling evolution process of multiple damage modes such as fiber fracture, matrix cracking and interface debonding is simulated. According to the method, a material-damage-response multi-scale analysis framework is constructed by coupling microscopic material components, a microscopic damage model and macroscopic pipeline structure analysis, the problem that a traditional method lacks multi-scale damage coupling analysis under a complex load is solved, and the residual strength evaluation precision of the pipeline under the action of a stretching-bending combined load is improved.

The invention provides a method and a system for predicting post-impact compression residual strength of an intercalation toughened composite material, and belongs to the technical field of electric digital data processing. According to the method, the interlayer fracture toughness is measured through a test, a finite element model is established, and initiation and evolution of intra-layer and interlayer damage are accurately captured by adopting a progressive damage theory in combination with a Hashin criterion and a cohesion method; after the impact, extracting a damage state variable of each unit, importing a deformation grid into a compression model, and synchronously reducing modulus, strength and fracture energy based on the damage variables to construct a high-precision post-damage material constitutive; and finally, obtaining the residual intensity through compression simulation. According to the method, initial oscillation and residual stress interference in a traditional restart method are avoided, automatic damage mapping and performance reduction are achieved through the Python script, the calculation efficiency and universality are remarkably improved, and a reliable simulation tool is provided for optimization design of the toughening layer.

The present application relates to the technical field of strength evaluation, in particular to a method for intelligent evaluation of residual strength of a marine low-temperature tank box outer container based on deep learning, comprising the following steps: collecting three-direction acceleration pressure wall temperature strain and outer container images, identifying crack angle, weld direction, crack depth and weld projection section, determining dangerous anchor points according to load principal vector method direction angle difference and strain peak value, extracting pressure temperature strain drop characteristics and calculating equivalent stress retention, and combining wall thickness stress intensity factor and fracture toughness threshold to output residual strength results. In the present application, the low-temperature lagging pressure peak stress retention of ship motion and the crack geometry are unified and mapped to the dangerous anchor points through the linkage of multi-source time sequence load and image crack information, the weld neighborhood risk is separated from the overall working condition, the timeliness of dangerous crack identification and the adaptability of residual strength judgment to low-temperature continuous action transient impact are improved, and the risk of conservative or dangerous evaluation is reduced.

This application relates to the field of mining anchoring technology, and provides a method and system for predicting the residual strength of anchor cables after corrosion. In this method, the corrosion influence parameters of the anchor cable in a corrosive environment are determined based on the changes in the physical parameters of the root wires constituting the anchor cable before and after corrosion. Based on the corrosion influence parameters and a pre-constructed residual strength model of the anchor cable after corrosion, the residual strength of the anchor cable after corrosion is predicted. Thus, by establishing the relationship between the residual irregular shape of the anchor cable after corrosion and its mechanical properties, the residual strength of the in-service anchor cable after corrosion can be predicted without conducting destructive pull-out tests. This provides a direct and reliable technical basis for the safety assessment and life prediction of in-service corroded anchor cables, and provides core support for the safe operation, remaining life prediction, and maintenance decisions of engineering structures.

An indication device for monitoring the structural integrity of a repair location on a laminate structure, produced from a composite material, of a part of an aircraft outer skin is specified. The indication device has at least one elongate, thin indicator strip. The indicator strip is detachably applied to the outer layer of the laminate structure in the immediate vicinity of the repair location. The indicator strip is designed to indicate a predefined residual strength of an adhesive joint of a repair patch to the surrounding composite material.

The invention provides a method for calculating the safety coefficient of a core pile-cement soil interface of a stiff composite pile. The method comprises the steps that statistical characteristic parameters of interface peak strength and residual strength are obtained according to an indoor shear test; geometric parameters of the pile foundation are obtained, and an interface is dispersed into micro units; a random field is constructed based on the coordinates of the micro-units, and correlation between the micro-units is calculated; setting a target failure probability, a safety coefficient initial interval and calculation precision; performing secondary Monte Carlo sampling to generate an intensity random variable, and assigning each micro-unit after correlation correction; judging the strength state of the micro-unit through a strength triggering threshold value, calculating the overall total resistance of an interface and a design external load, and performing statistics to obtain a failure probability; and adjusting the safety coefficient interval through reverse iteration and linear interpolation based on the target failure probability until the precision requirement is met, and outputting a final safety coefficient. The calculation result is accurate and reliable, and a scientific basis is provided for design and safety evaluation of the stiff composite pile.

The application discloses a method for evaluating the residual strength of a pipeline with corrosion defects under blasting vibration, and belongs to the technical field of oil and gas pipeline safety evaluation. In view of the problem that the traditional method only considers the corrosion geometric thinning and ignores the material dynamic performance degradation and spatial non-uniform distribution, leading to distorted evaluation, the application reconstructs the corrosion morphology based on detection data, constructs a corrosion damage variable, calibrates the damage-strain rate-material parameter mapping relationship through a mechanical test, establishes an explicit dynamic model of a pipeline-defect-soil-blast source, realizes non-uniform assignment of material performance in the corrosion area by using the UMAT subprogram of LS-DYNA, obtains stress, strain and damage state through nonlinear dynamic analysis, and completes the residual strength evaluation. The application couples the geometric defects and material degradation effect for the first time, greatly improves the evaluation accuracy and engineering applicability, and provides support for the safety control of pipeline blasting construction.

The invention provides an oil field well casing residual strength evaluation method and system based on numerical simulation, and relates to the technical field of oil field development casing safety evaluation. Based on the casing damage evaluation basic data of the target oil field block, establishing a block scale fluid-solid coupling numerical model reflecting an injection-production dynamic and formation mechanical response coupling relationship, and obtaining redistributed crustal stress field data around a shaft; redistributed crustal stress field data are used as boundary conditions, a three-dimensional coupling mechanical model containing a stratum, a cement sheath and a casing pipe is established in combination with the casing pipe structure and material parameters, and the stress distribution and the maximum equivalent stress of the casing pipe under the injection-production load effect are obtained through numerical simulation; and based on the maximum equivalent stress and the yield strength of the casing material, performing residual strength evaluation and damage risk grading on the casing according to the strength utilization rate and the residual strength coefficient. Therefore, the accuracy and the dynamic prediction capability of the residual strength evaluation of the oil field casing are improved, and a scientific decision basis is provided for casing damage treatment.

The invention discloses a chamber excavation surrounding rock failure area simulation method and related equipment, and relates to the field of geotechnical engineering stability evaluation.The method comprises the steps that an underground chamber excavation process is simulated through an underground chamber initial model without setting support measures, a plastic zone range is obtained, and principal stress information of a corresponding unit of a failure area is extracted; calculating the damage degree of the surrounding rock based on the surrounding rock stress state; performing zoning operation on the damage area according to the surrounding rock damage degree to obtain refined zoning information; on the basis of a triaxial compression test, rock mechanical parameters related to the residual strength of the surrounding rock under different damage degrees are obtained; assigning values to different partitions with different damage degrees according to the rock mechanical parameters related to the residual strength; and excavation numerical simulation is conducted again to obtain a new plastic zone range and main stress distribution, and final partition assignment and refined simulation are completed. According to the method, the authenticity, engineering adaptability and reliability of numerical simulation are improved, and the method has clear technical progress and engineering practical value.

The invention belongs to the field of structural strength analysis, and particularly relates to a complex metal structural strength analysis method which comprises the following steps: simulating a material elastic-plastic behavior of a complex metal structure through a nonlinear finite element method; checking a nonlinear finite element calculation result and ensuring that the maximum equivalent plastic strain in the result exceeds the ultimate plastic strain of the metal material; drawing a change curve of the equivalent plastic strain along with the structural load according to a nonlinear finite element analysis result; the failure load of the structure is determined through the ultimate plastic strain of the material; and the safety margin of the complex metal structure is accurately given through the relation between the working load and the failure load of the structure. According to the method, the residual bearing capacity after the metal material enters plasticity is considered, and the precision of a traditional linear strength calculation method of a complex metal structure can be improved; meanwhile, the accurate safety margin of the complex metal structure is calculated through the load relation, and engineers can conveniently and visually analyze and judge the residual strength of the structure.

The application provides a kind of magnesium slag based filling body damage constitutive model construction method based on energy dissipation, and relates to filling body damage analysis technical field.The method first makes magnesium slag based filling body test piece under different magnesium slag powder grinding time conditions, and obtains the stress-strain curve of each test piece by test, analyzes the energy evolution curve of each test piece;Then the damage dissipation energy is introduced into the energy balance equation of filling body, and the damage variable related to damage dissipation energy is obtained;Then compare the damage constitutive model, construct the energy modified damage constitutive model of magnesium slag based filling body considering the compaction stage and residual strength;Finally, verify the effectiveness of the model.The energy modified damage constitutive model constructed by the application is reasonable and effective, which can well describe the damage evolution process of magnesium slag based filling body under uniaxial compression, realize quick and accurate magnesium slag based filling body damage analysis, and provide scientific reference for the safety of mine filling mining engineering.

The invention discloses a rock residual strength determination method based on energy drop ratio parameters, and belongs to the technical field of geological engineering. According to a rock stress-strain curve obtained by a rock triaxial test, energy of each component in the damage process is calculated according to characteristics of the rock stress-strain curve, and based on an energy evolution rule in the rock damage process, an energy drop ratio parameter is proposed to quantitatively characterize strength drop; a residual strength determination method considering the whole rock damage process is provided through an energy drop ratio parameter; according to the method, the influence of the pre-peak stage and the post-peak stage on the residual strength is comprehensively considered, the rock residual strength determination method suitable for different post-peak descending trends is provided, the stability of the fractured rock mass is calculated through the residual strength, and the method has an important guiding effect on excavation, design and stability evaluation of rock mass engineering.

The present invention discloses a method for optimizing the structure of a composite hydrogen storage bottle, comprising: obtaining mechanical performance parameters of the hydrogen storage bottle, wherein the mechanical performance parameters include elastic modulus and shear modulus; inputting the mechanical performance parameters into a pre-constructed progressive damage model, adjusting the mechanical performance parameters through an environmental correction function to obtain the mechanical performance parameters of the hydrogen storage bottle under different working conditions, and simulating the damage evolution of the hydrogen storage bottle under different use conditions to obtain the change trend of the damage variable D, the service life and the residual strength R of the hydrogen storage bottle; based on the mechanical performance parameters of the hydrogen storage bottle under different working conditions, the change trend of the damage variable D, the service life and the residual strength R of the hydrogen storage bottle, designing the structural parameters of the hydrogen storage bottle, wherein the structural parameters include wall thickness, number of layers n and fiber angle.

The application discloses a kind of vanadium-added steel cylinder segment bearing performance prediction method considering uneven creep deterioration, it is related to data processing technical field, including the following implementation steps: the creep performance dataset of the material of different regions of vanadium-added steel cylinder segment is constructed;Creep performance dataset is implemented data enhancement using generative adversarial neural network;Using time fraction method, construct creep damage evaluation index;Residual strength dataset of the material after creep deterioration of different regions of vanadium-added steel cylinder segment is constructed;Using data-driven method, establish residual strength prediction model;Establish the finite element model of vanadium-added steel cylinder segment;Using time fraction method calculates its creep damage distribution;The residual strength distribution of the material after creep deterioration of vanadium-added steel cylinder segment is calculated;Realize the bearing performance prediction of vanadium-added steel cylinder segment considering uneven creep deterioration.The application has higher prediction accuracy, stronger reliability and lower implementation cost, and can provide scientific guidance for the suitability evaluation of over-service hydrogenation reactor.

The invention discloses a composite material hydrogen storage cylinder structure optimization method which comprises the following steps: acquiring mechanical property parameters of a hydrogen storage cylinder, the mechanical property parameters comprising an elastic modulus # imgabs 0 # and a shear modulus # imgabs 1 #; inputting the mechanical property parameters into a pre-constructed progressive damage model, adjusting the mechanical property parameters through an environment correction function so as to obtain the mechanical property parameters of the hydrogen storage cylinder under different working conditions, and simulating the damage evolution of the hydrogen storage cylinder under different working conditions, the change trend of the damage variable D and the service life and the residual strength R of the hydrogen storage bottle are obtained; based on the mechanical property parameters of the hydrogen storage cylinder under different working conditions, the change trend of the damage variable D, the service life of the hydrogen storage cylinder and the residual strength R, structural parameters of the hydrogen storage cylinder are designed, and the structural parameters comprise the wall thickness # imgabs2 #, the layer number n and the fiber angle # imgabs3 #.

This invention discloses a method and system for anomaly identification in multi-source monitoring data of steel structures, belonging to the field of steel structure monitoring data processing technology. The method includes acquiring multi-source monitoring data of steel structures and unifying time-scale alignment, generating a preprocessed dataset containing working condition features and quality markers. Based on the working condition features, the physical baseline prediction value is calculated; based on the preprocessed dataset, the data baseline prediction value is calculated, and dual residuals are obtained. The physical residual strength is calculated based on the dual residuals; and the residual inconsistency degree and sliding window adaptive threshold are calculated to output anomalies. This invention constructs a stable input through unified time-scale and quality marker constraints, generates physical and data dual baselines in parallel, and outputs dual residuals. Online discrimination is completed using correlation robustness strength + residual divergence adaptive weight + sliding window threshold, achieving an interpretable, traceable, and more robust anomaly identification process for long-term monitoring under working condition drift.

The present invention discloses a method for optimizing process parameters of high-efficient grinding of brittle materials, comprising the following steps: determining the critical speed of the tool; conducting grinding tests on the brittle materials; obtaining the surface roughness under different grinding parameters; calculating the remaining strength of the grinding surface; establishing a fitting formula for the relationship between the remaining strength of the grinding surface, the grinding force and the surface roughness; calculating the remaining strength of the grinding surface under all grinding parameters; respectively establishing fitting formulas for the relationships between the remaining strength σ of the grinding surface, the grinding force F and the grinding depth a p , the grinding feed rate v w ; and establishing an optimization model for selecting grinding parameters. The present invention greatly reduces the demand for test samples; can significantly reduce the sample size of damage detection, and the grinding force can indirectly reflect the influence of the grinding wheel state and the spindle vibration on the damage; and realizes the maximization of efficiency with the remaining strength of the surface of the part after grinding and the safety of the part during the grinding process as constraints.

This application discloses a rapid method for determining the macroscopic strength parameters of layered rock masses. For layered rock masses without discontinuous joints or fractures, the method includes the following steps: S1. Conducting conventional uniaxial triaxial compression tests on matrix rock blocks to obtain the stress-strain curves of the matrix rock blocks, and fitting the peak strength and residual strength of the matrix rock blocks under different confining pressures to obtain the strength parameters of the matrix rock blocks; S2. Conducting shear tests on bedding samples to obtain the stress-strain curves of the bedding surfaces, and fitting the peak strength and residual strength of the bedding surfaces under different normal stresses to obtain the strength parameters of the bedding surfaces; S3. Taking the average of the peak strength of the matrix rock blocks and the peak strength of the bedding surfaces, as well as the average of the residual strength of the matrix rock blocks and the residual strength of the bedding surfaces, to obtain the macroscopic equivalent strength parameters of the layered rock mass without discontinuous joints or fractures.

The present application relates to the technical field of composite material nondestructive testing and structure health monitoring, in particular to a new energy composite material micro-crack testing method based on ultrasonic echo; comprising: obtaining the time sequence ultrasonic echo signal of the target composite material in a continuous time period, and synchronously obtaining the soil volume water content and soil temperature; extracting the echo attenuation coefficient under different soil volume water contents, and analyzing the water saturation degree of micro-cracks; combining the soil humidity change curve and the water saturation degree change curve to calculate the capillary water absorption response coefficient; inputting the water machine coupling degradation prediction model to calculate the material degradation rate and the residual strength reduction coefficient; combining the future meteorological prediction data to extrapolate the water-sensitive micro-crack risk index, and obtaining the dynamic warning of the remaining safe life; the present application realizes the improvement from single static detection to the identification of the internal medium state of cracks.

The invention discloses a post-holing reinforcement method. The post-holing reinforcement method comprises the following steps: analyzing and summarizing the material of a to-be-holed structure, the physical and mechanical properties of the to-be-holed structure, the load condition of the to-be-holed structure, the holing position and size and the residual strength of the holed structure one by one to form an evaluation report; designing a holing reinforcement scheme based on the evaluation report; construction materials and construction instruments are prepared in advance according to the holing reinforcement scheme, and a construction site is prepared; holing is conducted based on the holing reinforcement scheme; reinforcing the surrounding structure of the hole based on the holing reinforcing scheme; and the punching quality and the reinforcing quality are checked and accepted, and through the reinforcing method, the post-punching reinforcing quality is improved.

The present invention discloses a design method for pressure-bearing equipment that resists explosion loads. The method first determines the working conditions, use requirements, explosion load types, explosion load impulses and main technical parameters of the pressure-bearing equipment, and then performs a preliminary design of the structural dimensions of the pressure-bearing equipment, and performs static strength verification. The finite element software is then used to perform elastic-plastic dynamic response analysis on the pressure-bearing equipment to obtain the distribution of plastic strain of the pressure-bearing equipment; the residual strength of the plastic strain concentration area of ​​the pressure-bearing equipment is calculated, and finally the residual strength of the pressure-bearing equipment is calculated, and the safety status verification standards for single use and multiple use of the pressure-bearing equipment are used to determine whether the explosion-proof performance of the pressure-bearing equipment meets the design requirements. The method of the present invention proposes a new calculation method for residual strength, and realizes the differentiated design of pressure-bearing equipment that resists single explosions and multiple explosions, which is highly targeted.

The present invention provides a mobile magnetically adsorbed non-uniform damage identification device and method for curved surfaces of steel structures, the device comprising a magnetic telescopic probe, a signal cable, a micro-voltage and current acquisition device, and an industrial computer, wherein the telescopic probe comprises a telescopic probe array, a four-point magnetic seat, a fixed bracket plate, a terminal block integrated board, a fastener, and a fastening nut. The magnetic telescopic probe adopts a four-point magnetic adsorption method and can be moved on the steel structure to be tested. The damage identification probe adopts the form of a telescopic probe array, which can be well adapted to the application scenario of curved steel structures. Based on the method for identifying non-uniform damage to curved surfaces of steel structures in which the fixed bracket plate is in the form of a flat plate or a curved plate, the square four-probe method and the reference model method are adopted to realize local damage area calculation, local damage thickness identification analysis, residual strength analysis and safety assessment, thereby obtaining the safety of the steel structure, and providing a feasible and efficient solution for the health management of curved steel structures.

This invention provides a method for determining the peak strength and residual strength of surrounding rock in underground caverns based on borehole data. The method includes arranging geological boreholes at one sidewall, the arch, and the face of the underground cavern; testing the longitudinal wave velocity of the rock mass at different depths within the boreholes; determining the thickness of the loosened and fractured rock mass to be excavated based on the wave velocity; calculating the volume and joint condition coefficient of intact and loosened / fractured rock mass blocks; and calculating the GSI value of the intact rock mass and the residual GSI of the loosened / fractured rock mass. r The peak strength of intact rock mass and the residual strength parameters of relaxed fractured rock mass are estimated using the generalized Hoek-Brown failure criterion. This invention can accurately and quickly estimate the peak strength of intact rock mass and the residual strength parameters of relaxed fractured rock mass, and has the advantages of good economy and convenient on-site operation. It can provide a reliable basis for the stability evaluation and support design of surrounding rock in underground engineering, optimize design schemes, and save engineering costs.