16 results about "Strength parameter" patented technology

The application discloses a kind of mesoscopic parameter multistage calibration method suitable for discrete element linear contact bonding model.The method follows the three-level progressive system of "single component-mixture-structure", and adopts the decoupling strategy of "stiffness first, strength later".Firstly, based on the uniaxial compression simulation of single component and mixture, the mapping relationship between macro modulus and mesoscopic normal stiffness is established to calibrate the stiffness parameter, and the parameter precision is further improved by structure load model fine tuning;then, based on the splitting simulation of single component and mixture, the mapping relationship between macro strength and mesoscopic tensile strength is established to calibrate the strength parameter.The method solves the problem of low efficiency and unclear physical meaning of traditional trial-and-error method, significantly improves the efficiency, accuracy and physical reasonableness of discrete element mesoscopic parameter calibration.

This invention discloses a stability analysis method for the bearing arch of a large-span tunnel based on compressive and tensile safety factors, belonging to the field of tunnel and underground engineering construction data analysis technology. The method includes the following steps: obtaining the tunnel geometry, surrounding rock mechanical strength, ground stress, and support parameters; simplifying the bearing arch formed by anchor spraying reinforcement into an arched beam elastically fixed to the sidewalls at both ends; determining the plastic loosening zone of the roof slab through numerical simulation, and using its self-weight as the main vertical load; calculating the internal forces and edge normal stresses of key sections of the bearing arch using structural mechanics, and classifying them into compressive and tensile stresses accordingly; calculating the compressive and tensile safety factors of each section based on the natural strength parameters of the surrounding rock, and using the minimum value as a quantitative index for evaluating the overall stability of the bearing arch. This invention establishes a quantitative mechanical model of the bearing arch, realizing accurate and convenient assessment of the safety of the anchor spraying support structure of the roof slab of ultra-large span tunnels.

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.

This invention relates to a method, system, equipment, and medium for determining the degree of weakening of passive soil strength in a foundation pit. The method includes: determining multiple target locations within the passive zone of the foundation pit and obtaining the first strength parameters of the soil at each target location before excavation; defining the weakened area within the passive zone, then obtaining and sampling multiple geological parameters within the weakened area to obtain multiple parameter samples; using a numerical analysis model to calculate the calculated deformation value corresponding to each parameter sample after excavation, thereby constructing a surrogate model; obtaining the actual deformation value of the support structure after excavation, using the surrogate model to obtain the geological parameters corresponding to the actual deformation value, and then using a finite element model to calculate the excavation of the foundation pit to obtain the second strength parameters of the soil at each target location after excavation; and obtaining the degree of soil weakening in the passive zone of the foundation pit after excavation based on the first and second strength parameters of each target location.

The application discloses a rainfall-flood coupling sliding probability prediction method based on physical model test, and the method is based on physical model test and multi-source monitoring data to construct a standardized multi-dimensional time sequence input matrix. Firstly, the effective normal stress sequence of the sliding zone is calculated in real time, the time-varying strength parameters are dynamically inverted through the nonlinear reduction model of the rock-soil body strength, and the geometric topology of the landslide is updated in real time. The improved limit equilibrium state equation considering the dynamic water pressure and the change of the geometric shape is established, and the deterministic safety factor at any time is solved. The probability distribution of the key mechanical and hydraulic parameters is determined, a plurality of parameter samples are generated by combining the Monte Carlo simulation random sampling, and the improved limit equilibrium equation is substituted to calculate the safety factor sample sequence in batches. Finally, the frequency of the values lower than the critical threshold is counted, the landslide instability probability at the current time is obtained, and the dynamic evaluation of the landslide stability under the rainfall-flood double action from the probability is realized.

The application discloses a kind of bank side slope rock-soil body strength parameter maximum weakening coefficient determination method, it is related to geotechnical engineering technical field, including, with structure main control area set as the main control factor of local mechanism model, the boundary condition and load condition of definition geological environment condition, set key response point observation position, construct local mechanism model with physical constraint;Multiple source sensing equipment is arranged in key response point observation position and monitoring data is collected, and difference optimization target is constructed with local mechanism model, difference optimization target is inverted, and the maximum weakening coefficient of target area is obtained;Maximum weakening coefficient is input, and numerical verification is carried out by local mechanism model, based on verification consistency, the maximum weakening coefficient of target area is extracted.The application can accurately depict the strength attenuation degree of bank side slope rock-soil body under limit working condition under the premise of keeping the consistency of geology and mechanics boundary, realizes the accurate determination and risk assessment of key unstable position.

The application relates to a method for calculating in-situ strength while drilling based on well-seismic fusion information, which comprises the following steps: step 1, constructing an initial mechanical parameter calculation model of a formation to be drilled according to well data and seismic data; step 2, obtaining geological mechanics basic parameters of the formation to be drilled in front of a drill bit according to the initial mechanical parameter calculation model; step 3, calculating geological mechanics strength parameters according to the geological mechanics basic parameters; step 4, calculating formation in-situ strength according to the mechanical strength parameters; and step 5, correcting the formation in-situ strength in combination with the well data to obtain in-situ strength while drilling under different working conditions. The application combines seismic data and drilling engineering data to establish a quantitative relationship between rock mechanics parameters and drilling parameters, and realizes rapid acquisition of in-situ strength while drilling under different working conditions in combination with Mohr-Coulomb strength criterion and experimental analysis correction.

The application discloses a rainfall-flood coupling sliding probability prediction method based on physical model test, and the method is based on physical model test and multi-source monitoring data to construct a standardized multi-dimensional time sequence input matrix. Firstly, the effective normal stress sequence of the sliding zone is calculated in real time, the time-varying strength parameters are dynamically inverted through the nonlinear reduction model of the rock-soil body strength, and the geometric topology of the landslide is updated in real time. The improved limit equilibrium state equation considering the dynamic water pressure and the change of the geometric shape is established, and the deterministic safety factor at any time is solved. The probability distribution of the key mechanical and hydraulic parameters is determined, a plurality of parameter samples are generated by combining the Monte Carlo simulation random sampling, and the improved limit equilibrium equation is substituted to calculate the safety factor sample sequence in batches. Finally, the frequency of the values lower than the critical threshold is counted, the landslide instability probability at the current time is obtained, and the dynamic evaluation of the landslide stability under the rainfall-flood double action from the probability is realized.

This invention relates to the field of data analysis and processing technology, specifically including a method and system for optimizing process parameters of a retaining ring press with reduced hydraulic column pressure based on strength parameters. The method includes: collecting and inputting temperature field data and pressure field data based on a high-temperature constitutive model corresponding to the retaining ring billet; constructing a joint optimization loop for parameters through L sets of pressing parameters; and coordinating the control of induction heating and infrared heating indices to converge the equivalent rheological strength parameters of each pass to the target strength range, thereby obtaining the optimal parameter combination. This solves the technical problem in the retaining ring pressing process where hydraulic column parameters and heating system are set independently, and process adjustments rely on empirical functions, easily leading to uneven microstructure and residual stress concentration. It achieves the technical effect of constructing a multi-pass joint optimization loop with equivalent rheological strength parameters as the core, driving the coordinated control of induction heating zone power, infrared radiation intensity, and pressing speed, force, and stroke of each hydraulic column, thereby improving forming consistency and microstructure density.

The application provides a method for determining the rock arch resistance height of a soft and hard alternating stratum tunnel and a firmware chip, relates to the technical field of tunnel engineering stability analysis and safety design, can combine the resistance failure mechanism of the key hole top part of the soft and hard alternating stratum tunnel, respectively consider the mechanical properties such as the elastic modulus, the cohesive force, the internal friction angle, the joint strength and the non-constant strength parameters of the soft layer and the hard layer, accurately depict the sequence characteristics and the spatial distribution of the soft and hard alternating stratum, so as to more truly reflect the load transmission path, the stress distribution law and the potential failure mode, and significantly improve the engineering fitting degree and the reliability of the calculation result. The application realizes the quantitative analysis of the supporting effect, takes the supporting stress as a clear external force component into the energy balance system, can quantitatively evaluate the influence of different supporting stresses on the rock arch resistance height, and provides a theoretical basis and a practical tool for the fine design and economic optimization of the supporting scheme.

This application discloses a method, equipment, medium, and product for constructing a physical model based on geomechanics, relating to the field of physical model testing. The method includes: determining a first geometric similarity ratio; determining a second geometric similarity ratio; establishing a dominant similarity law based on the first geometric similarity ratio to determine the baseline physical and mechanical parameters of the main material of the physical model; correcting the mechanical strength parameters of key structures based on the first and second geometric similarity ratios; constructing the main body of the physical model based on the baseline physical and mechanical parameters and the dimensions of the physical model, and constructing key structures based on the corrected mechanical strength parameters and actual fabrication dimensions; and integrating the constructed key structures with the main body of the constructed physical model based on the prototype geological body to be tested, obtaining the constructed physical model. This application can reflect macroscopic geological structures and reasonably characterize and control the mechanical effects of key structures within a limited physical model space.

The application discloses a kind of easy slip rock group fractured rock mass shear strength parameter fast estimation method, this method is first by standardized two-dimensional outcrop face conversion determination method, without equipment, quickly obtain field volume joint number J v ; further coupling J v With the rock mass strength parameter obtained by indoor rock test, the rock mass quality index BQ, the geological strength index GSI and the rock mass disturbance coefficient D are quantitatively calculated in sequence; wherein GSI is calculated by using the logarithmic closed solution formula conforming to the nonlinear evolution law of rock mass quality, and the value of D is solved by pure mathematical iteration algorithm, which completely avoids the dependence on wave velocity test equipment; finally, the improved Hoek-Brown criterion is used to complete the accurate estimation of cohesion c and internal friction angle. The application realizes the technical path innovation from equipment dependence to algorithm driving, is convenient to operate, low in cost, reliable in estimation result, and is suitable for rapid investigation and design of various easy slip fractured rock mass slopes.

This application discloses a method and system for characterizing the bonding strength of material interfaces, relating to the field of materials technology. By correlating the spatial coordinates and occurrence time of the full-field strain evolution field with acoustic emission events, this application can accurately identify the moment when the "first occurrence of a spatially concentrated acoustic emission event" and the "first occurrence of a strain concentration area" coincide in time and space, using this as the critical state for the initiation of interface damage. This judgment criterion overcomes the ambiguity of traditional methods that rely on post-hoc observation or single signal thresholds, achieving objective and quantitative capture of the damage initiation point. Based on this, key strain data under this critical state are extracted and input into a shear hysteresis model coupled with damage variables, and the equivalent bonding strength parameters of the interface are directly output through inversion calculation. This achieves integration from "damage initiation judgment" to "strength parameter extraction," providing a more accurate solution for characterizing the properties of material interfaces.

The present application relates to the technical field of three-dimensional geological model finite element analysis, in particular to a three-dimensional geological model simplification method and system introducing strength parameters, and specifically comprising the following steps: S1, establishing a three-dimensional geological model and extracting each stratum surface; S2, calculating normal vectors and normal vector entropy on all stratum surface grid nodes; S3, calculating Gaussian curvatures and Gaussian curvature entropy on all stratum surface grid nodes; S4, introducing corresponding strength parameters, and calculating the weight sum of the normal vector entropy and the Gaussian curvature entropy at the nodes according to the strength parameters; S5, traversing all stratum surface grid nodes, and eliminating nodes corresponding to an entropy value weight sum less than a preset threshold. The three-dimensional geological model simplification method introducing strength parameters can greatly restore the original geological model, greatly simplify the node quantity of the model, and further improve the accuracy of three-dimensional numerical simulation.