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191 results about "Surface shear" patented technology
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Shear surface. [′shir ‚sər·fəs] (geology) A surface along which differential movement has taken place parallel to the surface. Also known as shear plane.
Soil slope stability analysis method based on limit equilibrium theory and stress analysis
The present invention discloses a soil slope stability analysis method based on limit equilibrium theory and stress analysis, wherein the method comprises the following steps: 1) respectively preinstalling two slip surface starting points on the slope base and the next-to-top position of slope; 2) preinstalling a plurality of slip surface starting points on natural interface of slope between the two slip surface starting points; 3) setting the preinstalled safety factor corresponding with each slip surface starting point, and calculating out the critical slip surface corresponding to each slip surface starting point through calculating the found preinstalled safety factor satisfying the condition; and 4) selecting the critical slip surface with least preinstalled safety factor as the critical slip surface of whole soil slope, wherein the least preinstalled safety factor is used as the stability safety factor of whole slope. The soil slope stability analysis method of the invention has the following beneficial effects: (1) no requirement for pre-supposing the shape or position of slip surface, and only requirement for supposing the starting point position of slip surface (namely the position of so-called slip surface shear crack); and (2) translation of problem for searching the critical slip surface to the problem for searching the position of critical shear crack, and overcoming the problems of leaked solution or a plurality of solutions in the traditional method.
Owner:昌泰建设集团有限公司
Earth-structure interaction contact surface shearing test visualization device
InactiveCN101846606ARealize a full range of observationAchieve distortionMaterial strength using steady shearing forcesData acquisitionEngineering
The invention relates to an earth-structure interaction contact surface shearing test visualization device. The device mainly comprises an upper shear box (1), a lengthened lower shear box (2), a perspective window (3), a camera head (15), a connecting seat (16) and the like. The device shoots the shear band deformation and the earth grain change process in the whole shear test process by using the camera chain to acquire a series of shear band digital images at different time points and a whole-journey video, and provides references for quantitative analysis tests on the range, deformation and thickness of the earth-structure contact surface shear band. The invention has the characteristics of reasonable structure, convenient disassembly, high test load, large sample dimension, visualized shear test process, automatic data acquisition and the like, and ensures the rigidity of the shear box while realizing the overall visualized observation on the contact surface shear band. The invention can be widely used in contact surface mechanical parameter testing, and qualitative and quantitative analysis on the macroscopic and microscopic properties of the shear band under the earth-structure interaction in geotechnical engineering.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
Surface wave liquid sensor
InactiveUS6186005B1Reduce distractionsHigh measurement sensitivityAnalysing fluids using sonic/ultrasonic/infrasonic wavesAnalysing solids using sonic/ultrasonic/infrasonic wavesSurface shearShear waves
A liquid sensor has comb-shaped electrodes, applied to a piezoelectric substrate, as interdigital transducers for generating an electroacoustic wave from a transmitting transducer to a receiving transducer. The number of finger pairs of the interdigital transducers and the material out of which the electrodes are made are so chosen that a surface shear wave generated by the transmitting transducer and a bulk shear wave generated by the transmitting transducer have different frequencies.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Rock mass structural surface shear test method and device
InactiveCN104749049AGuaranteed shear strengthGuaranteed StrengthMaterial strength using steady shearing forcesHorizontal axisSurface shear
The invention discloses a rock mass structural surface shear test method, which comprises the following steps of firstly, cutting a rock mass test piece into a cuboid and marking a vertical axis line and a horizontal axis line; then adjusting an adjusting rod, fixing the rock mass test piece by a movable steel baffle, enabling the vertical axis line of the rock mass test piece to coincide with the vertical axis line of a normal loading mechanism, enabling the horizontal axis line of the rock mass test piece to coincide with the horizontal axis line of a shear loading mechanism, and enabling the structural surface of the rock mass test piece to be located above the movable steel baffle; carrying out grading force application on the rock mass test piece by the normal loading mechanism from the vertical direction, and carrying out grading force application on the rock mass test piece by the shear loading mechanism from the horizontal direction; receiving the force application data of the normal loading mechanism and the shear loading mechanism and the displacement values of a normal displacement sensor and a horizontal displacement sensor by a computer, and analyzing and calculating the data. The invention also provides a rock mass structural surface shear test device. According to the invention, the stress bearing condition of a rock mass in the reality can be simulated, and test data are accurate and reliable.
Owner:WUHAN UNIV OF TECH
Multi-fractal evaluation method for three-dimensional rock structure surface shear mechanical behavior
InactiveCN103926156ABig subjectivityOvercome the pitfalls of artificial valuationMaterial strength using steady shearing forcesClassical mechanicsStructural engineering
The invention provides a three-dimensional rock structure surface shear strength evaluation method. The method comprises the following steps of (1) acquiring three-dimensional topography data of a rock structure surface; (2) calculating multi-fractal characteristic parameters delta D (q) and delta a (q) of the structure surface according to a multi-fractal calculation formula, and representing the roughness of the three-dimensional rock structure surface by using the delta D (q) and the delta a (q); (3) carrying out a shear mechanics test on the rock structure surfaces with different roughness degrees to obtain shear mechanics parameters, and calculating the values of the delta D (q) and the delta a (q) of all the structure surfaces according to the step (1) and the step (2); and (4) testing a Barton shear formula improved by calculation data fitting by the step (3) to obtain the three-dimensional rock structure surface shear strength formula expressed by the delta D (q) or the delta a (q). Therefore, the rock structure surface shear strength can be evaluated by the three-dimensional rock structure surface shear strength formula in the engineering practice. The formula overcomes the defect that the Barton formula only considers about the two-dimensional characteristic and artificial estimation of joint roughness coefficient (JRC) of the structure surface, so that a method for comprehensively evaluating the shear strength characteristic of the rock structure surface is provided.
Owner:INNER MONGOLIA UNIV OF SCI & TECH
Apparatus and method for detecting surface shear force on a display device
ActiveUS20150242056A1Practical and inexpensive to manufactureImprove Sensing PerformanceInput/output processes for data processingDisplay deviceSurface force
A display device includes: a pixel array including a plurality of pixels; a plurality of infrared (IR) emitters to emit IR light towards a surface of the display device; a plurality of IR detectors to detect IR light; a deformable layer on the pixels, on the IR emitters, on the IR detectors, and at the surface of the display device; and a plurality of tracers at the deformable layer to reflect the IR light emitted by the IR emitters towards the IR detectors and to, while a shear force is being applied at a point of contact at the surface of the display device, shift ones of the tracers around the point of contact in a direction of the shear force such that IR reflectance at the surface of the display device is changed.
Owner:SAMSUNG DISPLAY CO LTD
Method for optically measuring shear stress of boundary layers of flow fields
ActiveCN106768822AImprove color recognitionImprove test accuracyAerodynamic testingFluid pressure measurement by optical meansOptical measurementsMeasurement precision
The invention discloses a method for optically measuring shear stress of boundary layers of flow fields, and relates to the technical field of wind tunnel tests. The method includes main steps of (1), anodizing and blackening wind tunnel test models; (2), smearing liquid crystal coatings; (3), acquiring relation curves of colors of the liquid crystal coatings and shear force; (4), mounting 6 test cameras; (5), simultaneously photographing the liquid crystal coatings by the 6 test cameras to obtain images of the liquid crystal coatings; (6), removing position difference of the images photographed by the different test cameras; (7), carrying out distortion removal processing; (8), correcting identical colors of the images photographed by the various cameras; (9), acquiring model surface shear stress vector distribution results. The method has the advantages that the obtained images are clear and visual, and the method is high in measurement accuracy and sensitivity and can be used for displaying the flow fields of wind tunnels, diagnosing transition and quantitatively measuring model surface friction drag.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS
Method for evaluating intracranial aneurysm rupture risk, device and computer equipment
PendingCN109961850ASolving a major challenge in fracture risk assessmentThe conclusion is accurateDiagnostic signal processingHealth-index calculationAneurysm ruptureIliac Aneurysm
The invention relates to a method for evaluating an intracranial aneurysm rupture risk. The method comprises the steps of acquiring image data; acquiring a starting point and a terminal point in a to-be-evaluated blood vessel for obtaining a segment of a target blood vessel; cutting the target blood vessel through a cutting plane for segmenting an aneurysm wall and a vessel wall; performing analysis and acquiring parameter information of the aneurysm and the blood vessel around the aneurysm; distributing the blood flow amount according to the parameter information of the aneurysm and the bloodvessel, and performing blood flow simulation on the blood vessel and the aneurysm through a volume simulating algorithm, and extracting multiple wall surface shearing stress parameters of the aneurysm and the corresponding blood flow dynamic parameter according to a simulating result; acquiring multiple kinds of data of clinical parameters; and performing calculation on the clinical parameter, the multiple wall surface shearing stress parameters of the aneurysm, the corresponding blood flow dynamic parameter and the parameter information of the aneurysm and the blood vessel which bears the aneurysm according to a machine learning algorithm for calculating the aneurysm rupture risk.
Owner:广州新脉科技有限公司 +1
High/low concentration-adaptive sediment movement numerical simulation method
ActiveCN107798176ACalculation results are reasonable and credibleDesign optimisation/simulationComplex mathematical operationsRiver mouthWater flow
The invention discloses a high / low concentration-adaptive sediment movement numerical simulation method. The method comprises the following steps of: (1) establishing a high / low concentration-adaptivesediment movement mathematic model; (2) calculating a boundary condition, a suspended sediment settlement speed, a bed surface shearing stress, a stability function and correction adapted to a high / low concentration sediment condition; (3) solving the high / low concentration-adaptive sediment movement mathematic model; (4) carrying out water flow verification on the sediment movement mathematic model by adoption of practically measured data, verifying a sediment concentration and verifying channel deposit distribution; and (5) analyzing influences, on river-mouth channel sediment deposit, of each factor according to a sediment movement mathematic model result. According to the method, a three-dimensional sediment transportation simulation technology is provided, a sediment movement numerical simulation technology which considers a water-sediment interaction mechanism and a sediment suspension mechanism under high / low concentration sediment conditions is provided, so that numerical simulation research is carried out on engineering problems such as river-mouth channel sediment deposit and the like, action process and mechanism of sediment transportation are analyzed, and scientific and technological support is provided for engineering practice.
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
Rock structure surface shape anisotropism evaluation method
The invention provides a rock structure surface shape anisotropism evaluation method which comprises the steps that (1) rock structure surface three-dimensional shape data are obtained; (2) according to an experiment variation function formula, a point pair in the structure surface analyzing direction is computed, and a development tendency chart following changing is drawn; (3) a variation function model is determined, function model fitting is carried out, and then a model parameter range a and a base table C are determined; (4) a dimensional method is used, and H (represented by a and C) is used for representing structure surface anisotropism features; and (5) values in all directions of structure surfaces are computed according to the steps (2), (3) and (4), and accordingly the anisotropism features of the rock structure surfaces are analyzed. According to the method, the rock structure surface shape anisotropism can be effectively represented in a quantification mode, convenience and accuracy are achieved, and a basis is provided for further and comprehensive evaluation of rock structure surface shearing strength.
Owner:INNER MONGOLIA UNIV OF SCI & TECH
Experimental apparatus for determining runway lawn protection-slope impact-proof performance
InactiveCN101074557AOvercoming the difficulty of generating high flow rate water flowAchieve direct marketingCoastlines protectionHydraulic modelsWater flowEngineering
The invention relates to the test device to detect the riverway dirot protecting slope and anti rushing character. It includes the reservoir, the water pump, the test flume, the drainpipe and the flow pipe. The valve and the flowmeter are set on the flowpipe and the test flume is a close flume with the rectangular cross section. The vegetation module box installing hole is set at the bottom of the test flume which is connected with the vegetation module box or the movable soleplate. The water pressing flume can generate water flow with big flow speed; the module test result is the bed surface shear stress and the frictional flow speed, which can module the rushing process of the river to the vegetation. So it has the big engineer using value.
Owner:HOHAI UNIV
Rock structural surface shear test method and implementation apparatus thereof
ActiveCN102735555ASolve the problem of not being damagedResolve Shear DeformationMaterial strength using steady shearing forcesFilling materialsRock sample
The invention discloses a rock structural surface shear test method and an implementation apparatus thereof. The method mainly comprises the steps that: an upper part and a lower part of a rock sample are respectively fixed in an upper opened shearing box and a lower opened shearing box with opposite opening surfaces through filling, wherein a certain distance is kept between the opening surfaces of the upper and lower shearing boxes, such that the rock sample block shear test structural surface is exposed between the opening surfaces of the upper and lower shearing boxes; a pair of shear loads with opposite directions are implemented on the upper and lower shearing boxes, and the loads act upon the rock sample block through the filling materials in the shearing boxes; the loads further act upon the rock sample block structural surface, such that the shear strength parameter of the rock sample block structural surface is obtained. According to the invention, the rock structural surface is subjected to a shear test, such that structural surface damage of the rock sample block during a moving process is effectively avoided, and test failure caused by damaged structural surface is prevented. The influence of cement upon sample block tests in prior arts is completely eliminated, and the true shear strength parameter of the rock structural surface can be obtained.
Owner:SICHUAN UNIV
Rock structure surface shearing device and method
ActiveCN103884608AGet the shear strengthGet propertiesMaterial strength using steady shearing forcesHeater RodData acquisition
The invention relates to a rock structure surface shearing device and method. The rock structure surface shearing device comprises a test piece system, a pressure plate system, a loading system and a data acquisition system, wherein the test piece system comprises an upper rock and a lower rock with heating holes on a rock structure surface, the loading system can be used for performing normal pressure loading, left shearing force loading and right shearing force loading, and the pressure plate system comprises two 7-shaped loading plates; the rock structure surface shearing device also comprises a roll set system which includes four groups of press rolls for connecting the loading system and the pressure plate system to reduce friction of a test piece and the loading system; the rock structure surface shearing device further can comprise a heating system which adopts heating rods to control the temperature of high-quality heat-resisting silicone oil in the heating holes to heat the upper rock and the lower rock on the rock structure surface; the data acquisition system can be used for acquiring data of pressure, displacement and temperature. The rock structure surface shearing device can bidirectionally shear the test piece of the rock structure surface and realize research to the shearing characteristic of the rock structure surface at different temperatures.
Owner:HUNAN UNIV OF SCI & TECH
High-speed moisture corrosion loop experimental device for simulating corrosion environment in natural gas pipeline
PendingCN109668824AMake up for the shortcomings that cannot meet the actual working conditionsEasy to operateWeather/light/corrosion resistanceGas phaseEngineering
The invention provides a high-speed moisture corrosion loop experimental device for simulating corrosion environments in a natural gas pipeline, and belongs to the technical field of corrosion tests.The device comprises a deaerating system, an external gas supply system, a gas phase circulating system, a liquid phase filling system, an external control system, a heating and insulating system, anexperimental test system, a waste liquid and waste gas treatment system and the like. The device has the advantages that the conditions such as internal medium flow state, flow speed, pressure and temperature of the natural gas pipeline can be simulated; the operating corrosion environments of low water content, high gas phase flow speed and high wall surface shear force station are represented tothe maximum extent, and corrosion behavior study and corrosion inhibitor evaluation can be realized by an inductance probe, electrochemical testing and a corrosion coupon; and the high-speed moisturecorrosion loop experimental device has an important significance for application of corrosion mechanism study of the natural gas pipeline and protecting methods for corrosion inhibitors and the like.
Owner:UNIV OF SCI & TECH BEIJING +1
Wave aberration measuring device and method
ActiveCN102608870AFast measurementImprove real-time performancePhotomechanical exposure apparatusMicrolithography exposure apparatusGratingWave aberration
The invention relates to a wave aberration measuring device and method. An illumination system produces an illumination beam; an object surface small hole comprises at least two object surface small hole marks, the at least two object surface small hole marks are arranged along a first direction, the object surface small hole marks comprise two object surface small hole sub marks, the two object surface small hole sub marks are arranged along a second direction, the first direction is vertical to the second direction, the grating directions of the two object surface small hole sub marks are respectively an X direction and a Y direction, and the illumination beam irradiates the object surface small hole to form a measuring beam; the measuring beam passes through a projection objective lens and then shoots an image surface shear grating so as to form a shear interference pattern; and a two-dimensional array photosensitive element obtains a plurality of shear interference patterns in the two directions through repeatedly changing the relative positions of the object surface small holes and the shear interference pattern, so as to calculate the wave aberration of the projection objective lens. According to the wave aberration measuring device and method, the wave aberration of multi-view-field points can be measured, so that the parallel measurement on the wave aberration of the multi-view-field points of a photoetching device is realized; and the measuring speed is fast, and the real-time performance is high.
Owner:SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
Low-viscidity flexible cement paste for well cementation with slim hole and single channel
ActiveCN103923628AAddress rheological requirementsMeet construction requirementsDrilling compositionEmulsionReducer
The invention discloses a low-viscidity flexible cement paste for well cementation with a slim hole and a single channel. The low-viscidity flexible cement paste for well cementation comprises the following components in parts by weight: 100 parts of cement, 37.0-56.0 parts of water, 3.5-5.0 parts of filtrate reducer, 1.0-2.0 parts of elastic emulsion, 0.5-2.0 parts of dispersing agent, 6.0-9.0 parts of pore proppant and 0.5-1.0 part of foam inhibiting and defoaming agent. The cement paste in the invention has the characteristics of relatively low dehydration property and relatively high stability, adjustable thickening time, short gelling strength development time and good invading and pollution resistance. The set cement permeability of the cement paste in the invention after solidification is reduced effectively, and excellent anti-corrosion and anti-fluid-channeling effects can be achieved. The preservative effect of the cement in the invention is improved by over 80 times compared with that of common set cement, the wall surface shearing effect is improved by over 30%, and the anti-fluid-channeling property is improved by over 40%.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Low-compression-ratio and thick-specification X70-grade gas transmission pipeline steel and production method
Low-compression-ratio and thick-specification X70-grade gas transmission pipeline steel is prepared from, by weight percent, 0.03-0.075% of C, 0.15-0.35% of Si, 1.30-1.90% of Mn, not larger than 0.015% of P, not larger than 0.002% of S, not larger than 0.006% of N, 0.035-0.065% of Nb, 0.025-0.05% of V, 0.015-0.025% of Ti, 0.1-0.40% of Cr, 0.1-0.2% of Ni and 0.10-0.25% of Mo. Production steps include heating of casting blanks with the thickness ranging from 225 mm to 235 mm, rough rolling, high-pressure water descaling, fine rolling, cooling, straightening and standby application. According to the low-compression-ratio and thick-specification X70-grade gas transmission pipeline steel, the X70-grade pipeline steel with the thickness being 30 mm or above can be produced through the continuous casting blanks with the thickness being 230 mm, the Rt0.5 of the product ranges from 500 MPa to 580 MPa, the Rm of the product ranges from 600 MPa to 650 MPa, the ratio of the Rt0.5 to the Rm is not larger than 0.90, and the elongation A50 is not smaller than 24%; at -20 DEG C, the impact energy KV2 is not smaller than 250 J; at -15 DEG C, the DWTT fracture surface shear rate SA is not smaller than 95%; and HV10 <=235.
Owner:武汉钢铁有限公司
Anisotropy evaluation method for rock structural surface shear strength
InactiveCN108446431AComprehensive quantitative evaluationGeometric CADSpecial data processing applicationsAdditive ingredientSpectral density
The invention discloses an anisotropy evaluation method for rock structural surface shear strength. The method comprises the following steps that: S1: obtaining the rock structural surface outline curve models of different shearing directions; S2: on the basis of the one-side PSD (Power Spectral Density)* of the rock structural surface, calculating the comprehensive power index Pf of each frequency ingredient which forms the rock structural surface for the roughness contribution of the rock structural surface; S3: calculating a corrected gradient mean square root Z2<*>; S4: on the basis of thecomprehensive power index Pf and the gradient mean square root Z2<*>, calculating the roughness parameter PZ of the rock structural surface; and S5: calculating the shear strength in different sheardirections of the rock structural surface. By use of the method, on the basis of the power spectral density, the contribution of each frequency ingredient which forms the rock structural surface for the roughness of the rock structural surface and the anisotropy characteristic of the roughness of the rock structural surface are analyzed, and therefore, the anisotropy of the shear strength of the rock structural surface can be more comprehensively subjected to quantitative evaluation.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Contact surface shear seepage test device and test method considering temperature effect
InactiveCN111896446AImplementing Shear Seepage TestsClear clipping pathEarth material testingMaterial strength using steady shearing forcesTemperature controlControl system
The invention discloses a contact surface shear seepage test device and test method considering a temperature effect. The contact surface shear seepage test device comprises an upper shearing box, a lower shearing box, a sealing system, a normal loading system, a horizontal loading system, a seepage water pressure system and a temperature control system. A concrete sample is placed in the lower shearing box and the lower shearing box slides in the X direction in a friction-free manner; a clay sample is placed in the upper shearing box; a sample contact surface is formed between the clay sampleand the concrete sample; the seepage water pressure system applies seepage water pressure in the Y direction to the sample sealing surface, and the seepage direction of the seepage water pressure ishorizontally orthogonal to the shearing direction of the shearing load; the temperature control system is used for controlling the temperature of the concrete sample. The three-field coupling effect of the stress field, the seepage field and the temperature field is considered at the same time, the state of the soil and concrete contact surface in actual engineering is truly simulated, and the device can be used for carrying out experimental study on the seepage characteristics of the soil and concrete contact surface under the action of different shear deformation and temperature changes.
Owner:HOHAI UNIV
Construction method of rock structural plane damage statistical constitutive model considering size effect
PendingCN110135113AVerify correctnessWell formedDesign optimisation/simulationSpecial data processing applicationsBreakage probabilityShear stress
The invention discloses a construction method of a rock structural plane damage statistical constitutive model considering a size effect, which comprises the following steps of: firstly, simplifying astructural plane into an equivalent thin layer, and determining damage variables according to the number of damaged mesoscopic microelements and the total number of the mesoscopic microelements in the thin layer; secondly, obtaining a damage probability density function of the mesoscopic unit body; then, determining a reasonable damage initial stage, simulating the structural plane load condition, and obtaining a statistical damage constitutive model of the structural plane under the shearing effect; secondly, according to stress balance in the shearing process, determining the relation amongnominal shearing stress, effective shearing stress borne by the undamaged infinitesimal body and shearing stress borne by the damaged infinitesimal body, and obtaining a damage evolution model and astructural surface shearing deformation damage constitutive model of the structural surface in the shearing deformation process; determining parameters m and u0 of the structural plane shear deformation damage constitutive model, and establishing a structural plane shear constitutive model considering the size effect based on the nonlinear relationship between the parameters and the size; finallyverifying the correctness.
Owner:CENT SOUTH UNIV
Near-surface shear wave interval velocity model establishment method
ActiveCN107561589AImprove accuracyHigh precision dispersion dataSeismic signal processingApparent velocitySurface shear
The invention discloses a near-surface shear wave interval velocity model establishment method. The method includes: A, sorting original shot point arrangement data according to a preset spatial sampling interval and source-receiver azimuth to acquire input data; B, analyzing the input data to acquire pure surface wave data; C, calculating surface wave dispersion data of a receiving point according to the pure surface wave data; D, correcting velocity parameters of the surface wave dispersion data of the receiving point from surface azimuth apparent velocity to true velocity according to a surface inclination angle of the source-receiver azimuth; E, subjecting surface wave dispersion data of each co-receiving point to true velocity curve statistics to form unique dispersion data of each co-receiving point; F, calculating a near-surface shear wave interval velocity model according to the unique dispersion data of each co-receiving point. The near-surface shear wave interval velocity model established according to the method is high in accuracy, three-dimensional seismic data surface waves can be effectively extracted while high-precision dispersion data are acquired, and converted shear wave correction accuracy in multiwave seismic data processing is improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
Electric double-surface shear apparatus
InactiveCN105758738ASmall sizeImprove the problem of shear stress concentrationMaterial strength using steady shearing forcesEngineeringRock sample
The invention relates to an electric double-surface shear apparatus.An upper shear box, a middle shear box and a lower shear box are arranged on a foundation base, a bearing plate is arranged on the upper end surface of the upper shear box, a pressurizing plate is arranged on the bearing plate, an A pull-pressure sensor is arranged on the pressurizing plate and connected with an extension bar of a perpendicular pressurizing electric cylinder, and a perpendicular displacement sensor is mounted on one balanced vertical column and is in contact with the pressurizing plate; the middle shear box is further connected with a B pull-pressure sensor which is connected with a horizontal pressurizing electric cylinder on a slide rail base, and a displacement infrared emitter is arranged on the middle shear box; a control cabinet is further arranged on the foundation base, controls travel adjustment of all electric cylinders and processes sensor date in real time; the apparatus can be used for shearing strength test of an undisturbed soil sample, a disturbed soil sample and a soft rock sample, the whole test process comprises sample installation, sample performance and sample collection after test, and sample mounting and dismounting operation is convenient.
Owner:XI'AN PETROLEUM UNIVERSITY
Comprehensive structural surface shearing strength evaluation method for rock mass based on mean value function
ActiveCN105606463AImprove accuracyMaterial strength using steady shearing forcesImaging processingStatistical analysis
The invention discloses a comprehensive structural surface shearing strength evaluation method for a rock mass based on a mean value function. The method comprises the following steps: selecting a structural surface of an engineering rock mass to be analyzed, and judging a potential sliding direction; uniformly distributing structural surface measurement sections in the potential sliding direction; drawing a contour curve of each measurement section with a contour curve instrument; extracting coordinate data on the contour curves with an image processing method, and thereby measuring a structural surface roughness coefficient of each measurement section; performing statistical analysis on the coordinate data of the structural surface under a condition of each size L independently to determine a minimum value and a maximum value of the roughness coefficient; fitting the distribution rule of the maximum values and the minimum values of the roughness coefficients of the structural surface under different size conditions respectively adopting exponential functions to obtain an interval function; combining the interval function of the structural surface shearing strength and an experimental structural surface shearing strength formula of Barton to obtain the mean value function expression of a structural surface shearing strength tao (JRC). According to the method, the accuracy of surface shearing strength evaluation for the rock mass can be effectively improved.
Owner:SHAOXING UNIVERSITY
Buried type composite water drainage tube
InactiveCN108506599AEffective protectionBlock water deliveryRigid pipesPipe protection against damage/wearWater resourcesTransmission channel
The invention discloses a buried type composite water drainage tube. The buried type composite water drainage tube comprises an outer protective layer and a transmission main tube which is arranged inthe middle of the outer protective layer, wherein a main conveying channel is arranged in the middle of the transmission main tube; one or more fixed clamping sleeves are arranged on positions, around the primary of the transmission main tube, of the outer part of the transmission main tube; the fixed clamping sleeves are mounted on the outer part of the transmission main tube at equal distance;and the outer part of each fixed clamping sleeve is equipped with a clamping cavity, a protective tube is arranged in the clamping cavity, and an auxiliary transmission channel is arranged in the middle of the protective tube. The buried type composite water drainage tube has very protective performance, can effectively protect the transmission main tube on the middle, utilizes the external protective tube to achieve the safety protection effect, effectively resists cutting, can block water intake by only needing to rotate the protective tube while the protective tube at the corresponding sideis damaged, is very convenient, and effectively saves water resources; and moreover, the whole transmission main tube can carry all protective tubes to rotate in the external protective layer, so that side surface shearing force is resisted.
Owner:董帅
Heat-variable surface shearing stress sensor
InactiveCN101520351AMiniaturizationHigh-resolutionTelevision system detailsSemi-permeable membranesElectricityEngineering
The invention discloses a heat-variable surface shearing stress sensor, which comprises a heating / heat-variable coil, a support film, a heat insulating groove, a support beam, a heat-variable electrode, an electric insulation film, a silicon bulk and a lead electrode. The sensor forms the support film and the electric insulation film by depositing on the surface of the silicon bulk, an substrate under the support film is etched which plays a role in supporting the heating / heat-variable coil; the support film is connected with the electric insulation film through the support beam; mutually independent heat-variable electrodes on the electric insulation film are prepared; and the heat-variable electrodes are evenly distributed on the outer edge of the heating / heat-variable coil; the heat insulating groove is arranged between the heating / heat-variable coil and the heat-variable electrodes; and the heating / heat-variable coil and the heat-variable electrodes are connected with an outside circuit through the lead electrode respectively. The sensor can determine the direction of liquid in a plane, and simultaneously measure the surface shearing stress on the solid surface generated by the liquid.
Owner:NANJING UNIV OF SCI & TECH
Method and system for advanced early warning and forecasting of earthquake disasters
The invention discloses a method and a system for advanced early warning and forecasting of earthquake disasters. The method comprises the following steps of: arranging a monitoring cable and a mechanical sensor in an earthquake-zone fault to detect the earthquake-zone fault surface shearing force, wherein the mechanical sensor is connected with the monitoring cable to sense the tension of the monitoring cable; calculating the earthquake-zone fault surface shearing force based on the following formula, wherein P is the earthquake-zone fault surface shearing force, M is the tension of the monitoring cable, alpha is the strengthening angle for the tension of the monitoring cable, theta is the included angle between the earthquake-zone fault surface and the horizontal plane, phi is the weighted average of all soil-layer internal friction angles in a shattered fault zone, and C is the weighted average of all soil-layer internal cohesions in the shattered fault zone; and sending out earthquake early warning and forecasting when the earthquake-zone fault surface shearing force is larger than an early warning value. The invention can send out earthquake early warning and forecasting signals before and after the movement of the earthquake fault, thereby actually realizing advanced and real-time early warning and forecasting of earthquake disasters.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Rock structural surface shearing method
ActiveCN105699212AGet the shear propertiesShear properties obtainedMaterial strength using steady shearing forcesStructure of the EarthData acquisition
Owner:HUNAN UNIV OF SCI & TECH
Underwater wall surface shear stress sensor calibration device having temperature control function
The invention discloses an underwater wall surface shear stress sensor calibration device having a temperature control function, belonging to the hydrodynamics test research field. The underwater wall surface shear stress sensor calibration device comprises a flat-wide long straight rectangle pipeline, a fixing installation support, a water pipe, an electromagnetic flow meter, a triangle measuring weir, a temperature constant water tank, a power water pump, a blending water pump, a heating rod, a temperature sensor, a temperature-control system and a corresponding calibration method. The beneficial effects of the invention are that: the invention provides a device for calibrating the underwater heat membrane type shear stress under the condition of the aqueous medium and the turbulent flow; the shear stress sensor calibration device can perform stable calibration on the heat membrane type shear stress sensor under various temperatures; and the device can perform research on effect of the suspended load and the electrolyte concentration on the measurement result of the underwater heat membrane type shear stress sensor.
Owner:NANJING HYDRAULIC RES INST +1
Dual-spindle surface shearing stress sensor
InactiveCN101482441AEasy to integrateEase of mass productionTelevision system detailsPiezoelectric/electrostriction/magnetostriction machinesBraced frameMicroelectromechanical systems
The invention discloses a double shaft surface shear stress sensor, belonging to the micro electromechanical system technology field, which consists of an upper and a lower layer; the upper layer is a surface shear stress mechanical structure manufactured on a monocrystalline silicon chip; and the lower layer comprises signal leading wires manufactured on a glass substrate. the upper layer mechanical structure of the surface shear stress sensor comprises a fixed pedestal, an outside fixed comb electrode, an outside sensitive comb, an outside support beam, a bracing frame, an inside support beam, an inside fixed comb electrode, an inside fixed comb, an inside sensitive comb and a floating unit; the inside fixed comb and the inside sensitive comb are used for measuring the surface shear stress in horizontal direction; and the outside fixed comb and the outside sensitive comb are used for measuring the surface shear stress in vertical direction. Applying the invention can determine the direction of the surface shear stress in a plane, and measure the magnitude of surface shear stress.
Owner:NANJING UNIV OF SCI & TECH
High-precision sensor verifying apparatus
ActiveCN104819806AEasy to calibrateSteady flow environmentFluid pressure measurementSurface stressTest channel
Disclosed in the invention is a high-precision sensor verifying apparatus for calibration and benchmark checking of an underwater surface shearing strength sensor. The apparatus comprises a water inlet tank, a water outlet tank, a test channel, and a return channel, wherein the test channel and the return channel are arranged between the water inlet tank and the water outlet tank. The test channel consists of a stable segment, a contraction segment, a verifying sensor experiment segment, a transmission segment, and an extension tube. The verifying sensor experiment segment includes an upper wall board and a lower wall board; static pressure measuring holes are formed in the center line of the lower wall board; and a die mounting hole is formed in the upper wall board. The return channel is formed by connection of a rectangular bending corner pipe, an outlet square-circular transition pipe, an upper-lower bending pipe, a water pump outlet bending pipe, and an inlet square-circular transition pipe. Besides, a centrifugal pump, a pressure regulating valve, and an electromagnetic flow meter are installed at the return channel. The Reynolds number is high; the apparatus is suitable for the laminar flow / turbulent flow conditions; and an objective of convenient, rapid and accurate verification of an underwater surface stress sensor can be achieved.
Owner:中国船舶重工集团公司第七〇二研究所
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