38 results about "Surface shear" patented technology

The invention discloses a plane sliding type rock slope seismic stability analysis model considering rough structural surface strength degradation. Aiming at the important defect that an existing structural surface strength vibration degradation model exaggerates the influence degree of a vibration wear effect influence coefficient and a relative movement speed effect influence coefficient on structural surface strength vibration degradation, the model is improved on the basis of a Barton criterion; therefore, a novel plane sliding type rock slope seismic stability analysis model considering the shear strength degradation of the rough structural surface is provided; parameter sensitivity analysis is adopted to research the influence rule of the seismic wave peak acceleration, the structural plane basic friction angle and roughness coefficient and the structural plane shear strength degradation factor influence parameters m and P0 on the slope seismic stability, and beneficial reference can be provided for slope seismic stability analysis.

The application discloses a micro-nano circular plate fracture analysis method considering coupling of surface effect and plastic zone, and firstly establishes a three-dimensional curved surface coordinate system suitable for a surface layer, and then further corrects a Dugdale cohesion force model according to a superposition principle after considering surface correlation of the plate, and then simplifies the Dugdale cohesion force model into a hyper-singular integral equation by using Hankel transformation, and finally obtains influences of the surface effect on the plastic zone size and crack surface displacement by numerically solving the hyper-singular integral differential equation.The method can accurately capture the nonlinear coupling relationship between the crack size, the surface shear modulus, the torsional displacement and the stress intensity factor under the micro-nano scale, effectively corrects calculation deviation generated by traditional classical theory when the surface effect is ignored, ensures the accuracy of the fracture analysis under different scales, and realizes more accurate and more comprehensive theoretical description of the elastic-plastic fracture behavior of the micro-scale material.

The application discloses a plane sliding type rock slope seismic stability analysis model considering rough structure surface strength degradation. In view of the important deficiency of the current structure surface strength vibration degradation model, that is, exaggerating the influence degree of the vibration wear effect influence coefficient and the relative movement speed effect influence coefficient on the structure surface strength vibration degradation, the application improves the above model based on the Barton criterion, thereby proposing a new plane sliding type rock slope seismic stability analysis model considering rough structure surface shear strength degradation, and adopts parameter sensitivity analysis to study the influence law of the peak ground acceleration of the earthquake, the basic friction angle and the roughness coefficient of the structure surface, the influence parameter m of the structure surface shear strength degradation factor and P0 on the slope seismic stability, so as to provide beneficial reference for the slope seismic stability analysis.

A stress-strain relationship estimation method according to the present invention comprises: a step (S1) for performing a torsion test on a first round bar test piece (10) to obtain a relationship between a torsion torque and a torsion angle; a step (S3) in which a torsion test is performed on a second round bar test piece (10) having a parallel section (11) having a smaller radius than the first round bar test piece (10), and the relationship between the torsion torque and the torsion angle is obtained; a step (S5) in which the relationship between the shear stress and the surface shear strain is obtained on the basis of the relationship between the torsion torque and the torsion angle obtained by the respective torsion tests of the first round bar test piece (10) and the second round bar test piece (10); and a step (S7) in which the shear stress and the surface shear strain are converted into uniaxial tensile stress and strain, and the relationship between the stress and the strain is estimated.

The utility model discloses a kind of stress regulation and control structures of anti steel bridge bridge surface shearing damage, belong to steel bridge technical field, for the uneven shearing stress distribution of steel bridge and pier contact surface caused by steel bridge surface stress concentration, easy to induce microcrack and gradually expand into structural crack, finally cause the problem of local or overall rupture of bridge surface, including pier, the bottom surface of pier inner side wall is fixed with horizontal plate, the top surface middle part of horizontal plate is fixed with double-shaft motor, two output ends of double-shaft motor are fixed with threaded rod respectively, the both sides of the top surface of horizontal plate are fixed with side block;The utility model cooperates with control box, adjusts the position of dispersion type support frame, so that the position of stress concentration of steel bridge can be supported, effectively disperses stress, avoids uneven shearing stress distribution of steel bridge and pier contact surface caused by concentrated stress, easy to induce microcrack and gradually expand into structural crack, finally cause the local or overall rupture of bridge surface.

This invention discloses a composite-structure wall shear-enhanced sintering raw material mixing and granulation device and method, belonging to the field of metallurgical sintering raw material processing technology. The device includes a storage cylinder and a stirring component disposed on its inner wall. The stirring component employs three optimized structures: a trapezoidal composite lifting component, a lifting plate and shear blade synergistic structure, or a lifting plate and inclined baffle synergistic structure. By optimizing the inner wall component structure, this invention can generate a three-dimensional composite force field of radial lifting, axial shearing, and diffusion on the material, significantly improving the mixing uniformity and granulation efficiency of the sintering raw materials, effectively controlling particle residence time, and reducing energy consumption. This invention has a simple structure, is easy to modify based on existing cylindrical equipment, and has extremely high industrial application value.

The invention discloses a rock mass structural plane shear evolution model establishment method and system and a medium, and belongs to the technical field of rock mass engineering numerical simulation. Comprising the following steps: acquiring characteristics of a rock mass structural surface in a shearing process in real time; constructing a heat-force-damage coupling model based on the rock physical parameters and the external acting force borne in the shearing process of the rock mass structural surface; dynamically optimizing the friction coefficient, the contact rigidity and the elastic modulus of the heat-force-damage coupling model through a deep reinforcement learning algorithm according to the characteristics of the rock mass structural surface in the shearing process, and outputting the heat-force-damage coupling model which accurately reflects the engineering practice; the heat-force-damage coupling model realizes real-time construction of a rock mass structural surface shear evolution model through real-time acquired characteristics of the rock mass structural surface in the shear process; according to the invention, high-precision real-time simulation of shear evolution of the rock mass structural plane is realized.

The utility model discloses a shear wall structure belongs to building construction technical field, including shear wall body and connecting component, the shear wall body both sides symmetry is provided with tenon, and the whole surface shear wall is formed to a plurality of groups splicing through tenon splicing, and longitudinal grouting cavity pouring fixed is formed, connecting component includes two connecting plates and fixed bottom plate, and connecting plate and fixed bottom plate perpendicularly weld in unison, and fixed bottom plate bolt fixed is on the beam body, and connecting plate is cooperated with the long groove of shear wall body lower part, forms horizontal grouting cavity and adopts bolt fixed, is used for vertical connection shear wall body and beam body. The utility model has the advantages of high installation stability, low construction precision requirement, simple construction process, reduces construction cost, and effectively shortens construction period.

A system and method for estimating the shear wall stress of an aerodynamic surface using a tuft visualization technique combined with a physics-informed neural network. The tuft visualization technique is a simplified method of generating velocity profile data of an aerodynamic model that can subsequently be used to generate a shear wall stress profile of the model. Systems and methods described herein also provide for additional input data using an augmented tuft and taps inputs for the physics-informed neural network to generate the shear wall stress profile.

The application discloses a kind of wave-current coupling scour simulation test methods in supergravity field, it is related to the cross field of geotechnical engineering and ocean engineering.This method synchronously collects multi-source observation signals under supergravity environment, constructs phase synchronous observation sequence with wave phase as index.Using low-dimensional filtering-inversion integrated method based on wave phase harmonic expansion, combined with adaptive basis function and scour starting physical constraint, high-precision inversion bed surface shear stress field.Through calculating the sensitivity of shear stress to wave-current phase difference and constructing nonlinear controllable domain, carry out shear stress controllability analysis.Based on this, adopt double-layer control strategy, outer layer planning target phase trajectory, inner layer combined with bed surface evolution state switch linear or nonlinear compensation control structure, generate control command of driving wave-making and flow-making mechanism.The application solves the problem that existing technology cannot simulate the dynamic change of wave-current phase and lacks real-time feedback of shear stress field, realizes the accurate closed-loop simulation of wave-current coupling scour.

The application discloses a construction method of a non-continuous structural surface shearing constitutive model, which comprises the following steps: obtaining peak value and residual stage shearing strength parameters; obtaining initial rock mass shearing strength τ of the non-continuous structural surface based on Jennings criterion; introducing coefficient ξ j and ξ r respectively to adjust normal stress at joints and rock bridges, and introducing coefficient ω to adjust cohesion in the rock bridges to obtain adjusted rock mass shearing strength τ of the non-continuous structural surface; obtaining three non-continuous structural surface failure criteria of tension, shearing and strength failure based on Lajtai rock bridge failure theory criterion; and obtaining corresponding non-continuous structural surface shearing constitutive models under tension failure conditions, shearing failure conditions and strength failure conditions of the rock bridges. The non-continuous structural surface shearing constitutive model can effectively describe the shearing behavior characteristics of the non-continuous structural surface and effectively improve the practicability of the constitutive model.

The invention provides an offshore energy island foundation seismic load simulation method and system, and relates to the technical field of offshore structure simulation analysis, and the method comprises the steps: constructing a finite element model comprising a structural steel pile foundation, a seabed soil body and a fluid domain, and defining a soil body structure coupling boundary; constructing a seismic wave sample library based on historical seismic wave data and dividing simulation step length; through a dynamic updating mechanism, geometric parameters, soil body attributes, fluid attributes and structural material parameters of the scouring pit are updated in real time in simulation, and structural characteristic data and dynamic response parameter time history including relative horizontal displacement, maximum bending moment and contact surface shear stress are output; extracting a maximum value of each response parameter to carry out probability statistical analysis, fitting out a feature response value under a specific exceeding probability, and comparing the feature response value with an allowable value to obtain a safety coefficient, thereby realizing multi-dimensional safety assessment; according to the method, the seismic scour coupling effect is comprehensively considered, and the simulation precision and the evaluation reliability are improved.

The invention relates to an arc wind tunnel conduit test wall surface shear force determination method, and belongs to the field of aircraft ground aerodynamic heat test research, the conduit test wall surface shear force determination method provided by the invention can rapidly and accurately obtain the wall surface shear force of an arc wind rectangular conduit test based on actually measured heat flow and pressure; according to the correction method based on development, rapid evaluation of the arc wind tunnel rectangular conduit test wall surface shear force can be realized, and shear force determination of a typical aerodynamic heating environment can be realized within seconds; based on heat flow and pressure measurement, a developed correction method is combined, the wall shear force of the arc wind tunnel rectangular conduit test can be evaluated more accurately, and the error is increased by at least one time compared with that of a conventional engineering method.

The invention discloses an atomization assembly and an atomization device. The atomization assembly comprises a piezoelectric ceramic piece, a focusing type amplitude-change pole and a liquid guide piece. The focusing amplitude-change pole is arranged on the piezoelectric ceramic piece and comprises an amplitude-change part and a liquid bearing part connected to the top end of the amplitude-change part; the side, away from the variable amplitude part, of the liquid bearing part is provided with a liquid bearing surface, the liquid guiding piece is used for guiding the liquid to be atomized to the liquid bearing surface, and the liquid to be atomized forms a liquid film on the liquid bearing surface. In the embodiment of the invention, high-frequency longitudinal vibration generated by the piezoelectric ceramic piece is transmitted to the focusing type amplitude-change pole, same-frequency resonance and amplitude amplification are realized at the amplitude-change part in the focusing type amplitude-change pole, and the amplified high-frequency high-amplitude longitudinal vibration is transmitted to the liquid bearing part, so that the liquid bearing part is excited to generate surface shear transverse waves; therefore, liquid molecules of a liquid film on the liquid bearing surface are fragmented and atomized, fine atomized particles are generated, and the atomization effect that the atomized particles are small in diameter and high in uniformity can be achieved.

The invention provides a method for preparing a natural structural plane of a dangerous rock and testing shear strength, which comprises the following steps of: judging the saturated compressive strength of the rock through a point load test to determine whether the rock is a hard rock; constructing a three-dimensional coordinate system by adopting a drilling television method, calculating an included angle between a normal vector of a structural plane and a normal vector of a rock wall surface, and drilling and coring according to the angle; the rock sample is poured into an Acm * Acm * Acm test piece, the structural surface contact area is kept to be Bcm * Bcm, then maintenance is conducted, A is not smaller than 15, and B is not smaller than 10; carrying out CT scanning three-dimensional reconstruction on the maintained rock sample to calculate a structural surface combination complete area and an opening area so as to obtain a correction coefficient; carrying out a direct shear test to obtain a cohesive force and an internal friction angle; and performing correction according to the correction coefficient to obtain the shear strength parameter of the natural structural plane.

The invention belongs to the technical field of shearing and grinding equipment, and discloses a multi-stage shearing, grinding and emulsifying device and an underground and ground shearing, grinding and emulsifying method. The multi-stage shearing, grinding and emulsifying device comprises an outer cylinder, a central shaft, at least one group of shearing units, at least one group of grinding units, a bearing bracket, a bearing system and a submersible motor, the shearing unit comprises a shearing rotor and a shearing stator guide shell, and the grinding unit comprises a grinding rotor and a grinding stator guide shell. The stator guide shells are sequentially fastened and connected through inner and outer steps at the ends to form a series stator assembly, all units are accommodated in an outer cylinder, and the outer diameter of the outer cylinder is smaller than the inner diameter of an oil well casing. The submersible motor drives the central shaft and all the rotors to synchronously rotate at a high speed, and the mixed liquid forms stable oil-in-water emulsion under the action of multi-stage shearing and grinding. The device is compact in structure, capable of being combined in a multi-stage mode, resistant to high pressure, capable of running into an oil well shaft for operation and suitable for underground emulsification viscosity reduction and ground pipeline blocking prevention, and the thickened oil recovery efficiency and conveying safety are remarkably improved.

The application discloses a tunnel or roadway ventilation resistance measuring and calculating method based on a circular tube cross-section flow velocity, which is composed of the following steps: calculating average air density and potential pressure difference, calculating wall surface shear stress, calculating reference velocity, calculating reference Reynolds number, calculating integer coefficient n and dimensionless shear stress s, calculating friction resistance coefficient, measuring channel cross-section area and circumference and calculating ventilation resistance; according to the application, the ventilation resistance of tunnel or roadway and rigid wind tube ventilation can be calculated by measuring air volume, pressure gradient and air velocities at two positions in the cross-section, and the measuring time and labor cost are greatly reduced under the premise of ensuring the measuring accuracy.

The utility model provides a sealed underwater wall surface shear resistance direct measuring device. The device comprises a square pipeline, a cover plate, a pressure sensor, a force transmission shaft, a sample carrying table and a to-be-measured sample piece. The device can simulate underwater navigation conditions through flowing liquid, so that shear resistance is generated between the liquid and a to-be-tested sample piece. And the resistance is transmitted to the pressure sensor through the force transmission shaft, so that the direct measurement of the underwater shear resistance is realized.

The present application relates to a kind of joint development stratum tunnel surrounding rock instability determination method, comprising the following steps: based on the joint occurrence information of working face based on multiple data acquisition;Based on the joint occurrence information of working face, draw the isodensity map, group joint, and the grouping result includes single group joint, two group joints and three groups and above joint;Based on different joint grouping situation, using corresponding tunnel surrounding rock instability determination method obtains instability determination result, specifically: for single group joint, respectively, the crushing and bending of weak part are calculated and the sliding failure calculation of structure surface shear strength control, judge its instability mode and instability range;For two group joints, on the basis of judging the instability block of tunnel free face, using cyclic search method, realize the determination of tunnel collapse range;For three groups and above joint, based on the homogenization thought, the broken surrounding rock is equivalent to homogeneous medium calculation, obtains instability determination result.Compared with prior art, the present application has the advantages of rapid determination, improve calculation efficiency and the like.

The invention provides a structural plane shear failure model under the cooperative influence of freeze-thaw cycle and compression-shear load. In the formula, the stress is normal stress; the friction angle is a basic friction angle; the angle is a characteristic angle; the uniaxial compressive strength of the number of freezing and thawing cycles is considered; the parameters are fitting parameters; the characteristic angle represents a corresponding critical apparent inclination angle when the contact area ratio of the shear side is 1 / e. According to the method, the feature angle lambda is mainly adopted to measure the rough features of the structural surface, a new model based on the feature angle lambda is provided, and the relation between the critical apparent dip angle and the potential contact area can be well represented; compared with a Grassselli model and a JRC-JCS model, the new model has remarkable advantages in the aspects of prediction precision and simplicity. Compared with a Grassselli morphology characterization method, the new model gathers the potential contact area of the shear facing side, the maximum apparent dip angle with unstable value is removed, a better fitting effect is achieved, and the problem of multi-parameter combination is avoided.

The application provides a water-force coupled anchoring structural surface shear performance test system and method, the system comprises: a prestress loading device, which provides prestress for the anchoring body sample to make the structural surface have a controllable water flow channel; a shearing device, which applies shearing force to the anchoring body sample to make the structural surface slide to damage the mortar protective layer; a high-pressure corrosion device, which provides a penetration pressure environment for the anchoring body sample to make the corrosion solution penetrate into the structural surface to corrode the anchor cable; a data acquisition device, which is used for monitoring the structural surface sliding displacement, shearing force, tension, water pressure and ion concentration; an anchor cable corrosion damage coefficient calculation device, which is used for obtaining the anchor cable corrosion damage coefficient in the anchoring structural surface; a residual shear strength calculation device, which is used for obtaining the residual shear strength of the anchoring structural surface after corrosion; and an anchoring body safety evaluation device, which is used for evaluating the safety state of the anchoring body. The application solves the problem of residual shear strength test of the anchoring structural surface considering the anchor cable corrosion damage under the synergistic action of multiple factors.

The invention discloses a wave-current coupling scouring simulation test method in a high gravity field, and relates to the crossing field of geotechnical engineering and ocean engineering. According to the method, multi-source observation signals are synchronously collected in a supergravity environment, and a phase synchronous observation sequence with a wave phase as an index is constructed. A low-dimensional filtering-inversion integrated method based on wave phase harmonic unwrapping is utilized, and a bed surface shear stress field is inverted with high precision in combination with an adaptive basis function and scouring starting physical constraint. And carrying out shear stress controllability analysis by calculating the sensitivity of the shear stress to the wave current phase difference and constructing a nonlinear controllable domain. Based on this, a double-layer control strategy is adopted, an outer layer plans a target phase trajectory, an inner layer is combined with a bed surface evolution state to switch a linear or nonlinear compensation control structure, and a control instruction for driving a wave generation and current generation mechanism is generated. According to the invention, the problems that the dynamic change of the wave flow phase cannot be simulated and the real-time feedback of the shear stress field is lacked in the prior art are solved, and the precise closed-loop simulation of the wave flow coupling scouring is realized.

The invention provides a quantitative evaluation method for shear mechanical parameters of a natural hard structural plane of a dangerous rock, which comprises the following steps of: acquiring a natural rock structural plane sample, and drilling and coring upper and lower wall rock masses of the structural plane to obtain a cylindrical rock sample; adopting a three-dimensional scanning method to obtain apparent morphology data of the rock mass structural plane samples, grouping the apparent morphology data, and respectively determining the joint roughness of each group; respectively placing the three groups of rock mass structural plane samples in molds, pouring concrete on the structural plane, and manufacturing three groups of concrete-rock mass structural plane shearing samples with different roughness; performing a uniaxial compression test on the cylindrical rock sample to obtain the structural surface rock strength; respectively carrying out direct shear test on the three groups of concrete-rock mass structural surface shear samples to obtain tangential stress data under different roughness and different normal stress; fitting the test data of the three groups of samples, and calculating the shear strength under any roughness condition by adopting a coefficient obtained by fitting.

The shearing machine comprises a machine box, the top of the machine box is connected with a machine frame, an air cylinder is arranged on the top of the machine frame, a piston rod of the air cylinder penetrates through the machine frame in a sliding mode and then is connected with a cutter assembly, an opening is formed in the surface of the top of the machine frame, and a discharging assembly is arranged in the opening. After shearing is completed, the motor drives the conveying belt to move, the push plate moves along with the conveying belt and pushes the sheared materials to move towards the inclined groove and make contact with the rotating roller to slide downwards, and therefore automatic discharging is achieved, manual discharging is not needed, the production efficiency is greatly improved, and the problem that the manual discharging efficiency is low is solved. When the conveying belt works and drives waste materials generated after the surface of the conveying belt is sheared to move to the top of the collecting box, the conveying belt continuously moves to enable the waste materials to fall into the collecting box under the action of gravity, and therefore the sheared waste materials can be collected, and follow-up recycling of the waste materials is facilitated.

The invention discloses an ice rock contact structural surface shear strength prediction method based on roughness and temperature, belongs to the technical field of ice rock contact structural surface shear strength prediction, and solves the problem that an existing ice rock contact structural surface shear strength prediction method does not consider the influence of roughness and temperature factors. The method comprises the step of predicting the shear strength of the ice rock contact structural surface through an ice rock interface shear mechanical model. According to the invention, the shear strength value of the ice rock structural surface under different temperatures and roughness can be directly predicted according to the size of the ice rock contact sample, the JRC value, the temperature, the ice mechanical property, the rock mechanical property and the normal stress, the interface strength characteristic can be predicted on site under the field condition, and the interface mechanical parameter value can be further estimated.

The utility model relates to a numerical control light flying shear straightening machine, which belongs to the technical field of metal processing and comprises a machine body, a first mounting frame, a second mounting frame, a straightening machine and a shearing frame are fixedly mounted on the machine body, and a cam shearing mechanism is arranged on the shearing frame. The cam shearing mechanism comprises a shearing motor and a sliding support which are fixedly installed on the surface of the shearing frame. According to the numerical control light flying shear straightening machine, the shearing motor directly drives the cam to rotate, then the lower pressing block is driven to slide on the sliding support, the shearing telescopic rod is triggered to do telescopic motion, and the cutter is driven to move rapidly. The shearing efficiency is remarkably improved, meanwhile, the cutter can obtain larger power support in the shearing process, so that the shearing force is enhanced, the shearing equipment can adapt to steel wire diameters in a wider range, the adaptability of the equipment is improved, and the application range of the equipment is widened.

The application discloses a shear capacity prediction method and system based on an intelligent algorithm: test data of a double-sided laminated shear wall laminated surface shear capacity test is acquired; three second-order interaction features are constructed through feature multiplication according to a seven-dimensional input feature vector, and combined with original seven-dimensional features to form a ten-dimensional enhanced feature vector; the ten-dimensional enhanced feature vector is normalized; a standardized data set is divided into a training set and a test set; a three-layer BP neural network including an input layer, a hidden layer and an output layer is constructed; the training set is used to train the BP neural network by using a back propagation algorithm, and network weight and bias parameters are updated by using a gradient descent algorithm until a loss function converges or a maximum iteration number is reached; the prediction accuracy of the trained BP neural network is evaluated according to the test set; and the shear capacity of a to-be-tested sample is calculated by using the BP neural network that has passed evaluation. The application improves the bearing capacity prediction accuracy.

The invention belongs to the technical field of seaside sediment movement, and provides a seaside sediment model construction method and device and a medium, and the seaside sediment model construction method comprises the steps: obtaining initial seaside environment data; acquiring a seaside shallow water model and a seabed surface shear stress according to the initial seaside environment data; critical shear stress is obtained, and the sediment movement state is judged according to the seabed surface shear stress and the critical shear stress; the bottom bed deformation model is constructed, the bottom bed elevation is obtained according to the sediment movement state and the bottom bed deformation model, through the steps, real-time prediction of the bottom bed elevation of the seabed is achieved, then the prediction result is more accurate, and meanwhile the cost is reduced.