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70 results about "Soil dynamics" patented technology
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Simple instrument method for test of internal stress of soil mass under cyclic loading
ActiveCN105181498AMaterial strength using repeated/pulsating forcesAutomatic controlData acquisition
The invention relates to a soil dynamic characteristic test technique for geotechnical engineering and especially relates to a simple instrument and a method for test of an internal stress of a soil mass under cyclic loading. A large quantity of researches and reports record that the roadbed soil under the cyclic loading is suffered from dynamic stress accumulation, but the academics does not pay attention to the phenomenon. The simple instrument can be mainly used for measuring the response conditions of the internal stress in the soil on factors such as different cyclic loading magnitudes, loading waveforms, loading frequencies and soil compaction rate, and acquiring the parameters, such as settlement curve, dynamic elastic modulus, total deformation modulus, static elastic modulus, of the soil mass under the cyclic loading effect. The method provided by the invention belongs to an innovative technology which is simple in laboratory test and convenient in soil dynamic characteristic acquisition; with the help of a lever pressure meter, the instrument can realize 10-times load output and can save instrument consumable materials and power sources; a computer system can be utilized to realize the automatic control on the instrument control and the data collection.
Owner:SUN YAT SEN UNIV
Frozen soil dynamic load direct shear apparatus
ActiveCN103175742ASolve the problem of not being able to test fine-grained soilsConstantly monitor the temperatureMaterial strength using steady shearing forcesControl systemComputerized system
The invention discloses a frozen soil dynamic load direct shear apparatus comprising a shearing box. The shearing box comprises an upper shearing box and a lower shearing box. An ejection head seat is arranged outside the right side of the upper shearing box. A fixed seat is fixed on the end of the right side of a workbench. An ejection head is fixed on the fixed seat. The ejection head matches the ejection head seat of the upper shearing box. The right end of the upper shearing box is fixed. The left end of the upper shearing box is fixed through a fixing device arranged on the workbench. A pushing head is arranged outside the left side of the lower shearing box. The pushing head is connected with an actuating shaft of a loading head through a pin. The loading head provides horizontal dynamic load for the lower shearing box through the actuating shaft. The loading head is fixed on the left side of the workbench through a fixing plate, and is connected with an oil pump. A displacement meter ejection plate is arranged on the actuating shaft. The displacement meter ejection plate cooperates with a displacement meter, and the two are used for measuring real-time displacement of the lower shearing box. A force feedback device is also arranged on the actuating shaft. The displacement meter and the feedback device are connected with a digital measurement and control system and a computer system through a data acquisition device.
Owner:BEIJING JIAOTONG UNIV
Method for evaluating resistance of sandy soil on embedded submarine pipeline under action of waves
InactiveCN105424466AResolve yieldSolve technical problems of soil damageMaterial strength using steady torsional forcesMaterial strength using steady shearing forcesOcean bottomLoad time
The invention discloses a method for evaluating resistance of sandy soil on an embedded submarine pipeline under the action of waves. The method comprises the steps that soil body samples with different relative densities are prepared by obtaining sandy soil samples; different initial static stress ratios are selected for soil body samples with the corresponding relative densities, different dynamic cyclic stress ratios are applied to the soil body samples, the frequency of dynamic cycle and loading time are controlled, and a dynamic stress-strain change rule curve and a cyclic strength change rule curve are obtained; according to the dynamic stress-strain change rule curve and the cyclic strength change rule curve, a sandy soil dynamic strength-deformation and pore water pressure growth mode theoretical model is established, horizontal force and vertical force are applied to the pipeline, the size of constraint force of a sandy seabed on the embedded submarine pipeline is further obtained according to a load-displacement relationship, and a basic theoretical method is provided for design of embedding the pipeline in the seabed and evaluation of stability.
Owner:BC P INC CHINA NAT PETROLEUM CORP +2
Weak soil dynamic behavior testing system for continuously and finely tracking in overall-process manner
InactiveCN102636391ARealize continuous fine trackingRealize multi-scale panoramic three-dimensional observationMaterial strength using tensile/compressive forcesMaterial strength using repeated/pulsating forcesComputerized systemEngineering
The invention discloses a weak soil dynamic behavior testing system for continuously and finely tracking in an overall-process manner. The weak soil power property testing system consists of a pressure chamber, a pressure control system, an excitation system, a measurement system, a servo control system, a microscopy observing system and a computer system. The weak soil power property testing system provided by the invention has the main advantages of overall-process continuous and fine tracking and high-precision measurement under the action of water. Furthermore, the multi-scale panorama three-dimensional observation can be realized, so as to finally show power properties of weak soil.
Owner:SUN YAT SEN UNIV
Method for dividing density degrees of gravelly soil foundations through surface-wave inversion shear wave velocities
ActiveCN104711965ASimple and automatic determinationQuick and automatic determinationIn situ soil foundationSurface wave inversionCrushed stone
The invention discloses a method for dividing the density degrees of gravelly soil foundations through the surface-wave inversion shear wave velocities. Compared with the prior art, the method has the obvious advantages that as Rayleigh waves have the different propagation velocities in the gravelly soil dynamic-compaction foundations with the different density degrees, the propagation velocity of the Rayleigh waves in a surface slack layer serves as the standard, and the relationships between the Rayleigh waves and the density degrees in the gravelly soil dynamic-compaction foundations with the different density degrees are built. The density degrees of the gravelly soil dynamic-compaction foundations are simply, rapidly and automatically determined, and the problems that during current detection, the exploration difficulty is large, time is long, cost is high, and the detection depth is limited are solved.
Owner:WUHAN SURVEYING GEOTECHN RES INST OF MCC
Soil sampler directly used for undisturbed-sample dynamic characteristic test
The invention relates to a soil sampler directly used for an undisturbed-sample dynamic characteristic test. The problems that an I-grade sand-soil undisturbed sample collected by an existing soil sampler is difficult during processing and preparing in a laboratory, and is prone to disturbing the undisturbed structure of a sand-soil sample are effectively solved. An outer upper cylinder and an outer lower cylinder are rotationally installed; sliding grooves are formed in the two sides of the outer lower cylinder, a spring in the lower portion of the outer upper cylinder is pressed at the top of an inner cylinder body in the outer lower cylinder, side lugs are arranged at the top of the inner cylinder body, flexible pipe holes are formed in the portions, below the side lugs, on the two sides of the inner cylinder body, and the inner cylinder body is rotationally installed on a waste soil pipe; the waste soil pipe is connected with a soil sampling pipe, and the soil sampling pipe is connected with the upper end of a pipe boot. The soil sampler is simple in structure and convenient to assemble and disassemble, and is one of ideal tools for collecting the I-grade sand-soil undisturbed sample for the soil dynamic characteristic test in drilling.
Owner:GEOPHYSICAL EXPLORATION CENT CHINA EARTHQUAKE ADMINISTATION
Method for quickly grading terrene surrounding rock in real time on basis of while-drilling parameters
ActiveCN106157181ASolve problems that cannot be used in one wayAvoid disturbanceData processing applicationsGuidelineSoil science
The invention discloses a method for quickly grading terrene surrounding rock in real time on the basis of while-drilling parameters. The relational expression between a clay soil liquidity index and the while-drilling parameters, the relational expression between the sandy soil standard penetration hammering number and the while-drilling parameters and the relational expression between the gravel soil dynamic sounding hammering number and while-drilling parameters can be established, in actual underground engineering, the soil variety of a terrene tunnel is firstly judged, drilling detection is conducted, the obtained while-drilling parameters are substituted into the relational expressions to obtain the liquidity index I<L> of clay soil surrounding rock, the standard penetration hammering number N of sandy soil surrounding rock and the dynamic sounding hammering number N<63.5> of gravel soil surrounding rock, and then quick and real-time grading is conducted on the surrounding rock in front of a tunnel face according to the Guidelines for Design of Highway Tunnel. According to the method for quickly grading the terrene surrounding rock in real time on the basis of the while-drilling parameters, only drilling testing needs to be conducted on the surrounding rock through a drilling machine at an engineering site, other tedious indoor tests or site tests are not needed, quick and real-time grading is conducted on the terrene surrounding rock, the grading efficiency is high, and operation is easy.
Owner:SHANDONG UNIV
Dynamic pore water pressure measuring method
InactiveCN1560581AFluid pressure measurement using elastically-deformable gaugesIn situ soil foundationPore water pressureEngineering
The invention discloses a moving aperture water pressure measuring method, the method uses the normal pressure sensor as the basic measuring component, a sealing cover made up of hard material are arranged on the pressure sensor, the sealing cover buckles the sensing detector mangle of the pressure sensor into a space, the space is connected to exterior through several aperture with proper diameter arranged on the sealing cover, the pressure sensor with sealing cover is put into the soil to be measured, when the aperture water in the soil fills up the space containing the sensing detector, the measurement can be carried on, the water in the space also can be filled manually. The invention can be applied to research work of sand and soil dynamic mechanics in lab, detection of aperture water pressure in road base, detection of underground water level and so on.
Owner:INST OF MECHANICS - CHINESE ACAD OF SCI
Pile head fixed end pile-soil dynamic interaction vibration table test device and construction method thereof
InactiveCN105067212ASolve problems such as cumbersome collectionVibration testingMeasurement deviceData acquisition
The invention provides a pile head fixed end pile-soil dynamic interaction vibration table test device and a construction method thereof. The device comprises a vibration table board, a test pile, load sensors, an abutment and strap, a concrete mass block, a sand box, corbels, and a displacement measurement device. The test pile is consolidated at the bottom of the sand box. The top of the test pile and the abutment and strap are consolidated as a whole. The counter weight is placed on the abutment. The horizontal load sensor and the vertical load sensor are respectively placed on the top ends of the corbels at the two sides. According to the pile head fixed end pile-soil dynamic interaction vibration table test device and the construction method thereof, by optimizing the experimental model structure, the defect that a conventional test device of the kind cannot truly simulate the interaction between an integral bridge abutment support pile and soil dynamic and cannot comprehensively collect the end support force, horizontal displacement and the like of the abutment and the strap in the test process is solved. The top end of the corbels is equipped with a flexible and light dowel bar device for measuring the horizontal displacement and force of the abutment, and therefore, the problem that test data acquisition is cumbersome is solved.
Owner:FUZHOU UNIV
Multi-load coupling loading device for testing ocean engineering pile foundation-soil dynamic response
InactiveCN109724864AImprove simulation accuracyMaterial strength using repeated/pulsating forcesCouplingSoil dynamics
The invention discloses a device for loading an ocean engineering pile foundation under the action of horizontal and vertical cyclic loads and an impact load, and particularly relates to a testing device and a testing method for ocean engineering pile foundation-soil dynamic response under the multi-load coupling action. The testing device comprises a cuboid model box, a model steel pipe pile, a fixed support, a horizontal cyclic load loading device, a vertical cyclic load loading device and a horizontal impact load loading device. A load-bearing state of the ocean engineering pile foundationin the whole life cycle is considered; the horizontal cyclic load, the vertical cyclic load and the horizontal impact load can be simultaneously or separately applied, and a soil-around-pile rigidityweakening rule caused by the dynamic response of the ocean engineering pile foundation under the multi-load coupling action and the pile-soil interaction also can be obtained; and the testing device and the testing method have important significance for ocean engineering pile foundation design, construction and maintenance.
Owner:OCEAN UNIV OF CHINA
Roadbed gravel soil dynamic resilience modulus estimation method
ActiveCN111474029AImprove estimation accuracySolve the problem that the dynamic rebound modulus value of subgrade gravel soil cannot be accurately estimatedPreparing sample for investigationEarth material testingSoil scienceTriaxial shear test
The invention discloses a roadbed gravel soil dynamic resilience modulus estimation method which comprises the following steps: respectively configuring roadbed gravel soil with different stone contents, carrying out a compaction test on the roadbed gravel soil, and determining the optimal water content and the maximum dry density of the roadbed gravel soil with different stone contents; preparingtriaxial roadbed gravel soil samples with different compaction degrees by adopting the configured roadbed gravel soil with different stone contents, and carrying out dynamic triaxial test on the triaxial roadbed gravel soil samples to obtain dynamic resilience modulus values of the roadbed gravel soil samples under different working conditions; comparing and analyzing the dynamic resilience modulus values of the roadbed gravel soil sample under different working conditions, and establishing a roadbed gravel soil dynamic resilience modulus estimation model; fitting the roadbed gravelly soil dynamic resilience modulus estimation model to obtain model parameters, and finally estimating the roadbed gravelly soil dynamic resilience modulus under different working conditions by adopting the roadbed gravelly soil dynamic resilience modulus estimation model with the known model parameters. The problem that the dynamic resilience modulus of the roadbed gravel soil cannot be accurately estimated is solved.
Owner:CHONGQING JIAOTONG UNIVERSITY +1
Method for determining distributed explosive source triggering parameters
The invention provides a method for determining distributed explosive source triggering parameters. The method comprises the steps of (a) adopting a near-surface survey method to delimit a rock-soil layer horizon of a surface layer and determining basic physical parameters; (b) performing gun testing and triggering, and monitoring and recording ground vibration; (c) according to gun testing arrangement and rock-soil layering of the earth surface, establishing a finite element model of explosion action in rock-soil of the explosive source; (d) performing comparing regression analysis by finite element model calculation and test monitoring records, and determining rock-soil dynamic deformation model parameters; (e) performing analysis comparison on initial elastic wave energy and frequency in multiple distributed explosive source triggering schemes on the basis of the established on-site rock-soil layer model, combining exploration target layer characteristics and requirements, and determining that the distribution satisfying the energy and resolution is explosive source triggering parameters. The method for determining the distributed explosive source triggering parameters, provided by the invention, is rapid in speed, wide in application scope, low in cost, simple and convenient, and easy to implement.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Open trench vibration isolation design method based on quantitative analysis
InactiveCN108416182AThe analysis result is accurateGeometric CADDesign optimisation/simulationNODALTransient analysis
The invention discloses an open trench vibration isolation design method based on quantitative analysis. The method includes the steps that 1, a finite element calculation model related to the foundation is established; 2, foundation soil dynamic material parameters and a dynamic load time travel curve are determined; 3, a dynamic finite element basic equation is established, vibration isolation trenches with different depths are set on the finite element calculation model, the finite element calculation model is analyzed, and the dynamic finite element basic equation is solved by utilizing the dynamic material parameters and dynamic load of foundation soil to obtain mass matrixes, damping matrixes, stiffness matrixes and nodal load vectors of all node units of the finite element calculation model; 4, transient analysis is conducted to acquire a post-trenching surface vertical velocity response value; 5, according to the post-trenching surface vertical velocity response value, a post-trenching vibration velocity maximum value and distance relation curve of the vibration isolation trenches with different depths is obtained by fitting, and the range of a velocity response enhancementzone and a building and vibration isolation trench distance corresponding to an expected vibration isolation effect of the vibration isolation trenches in later engineering construction of the reinforcement zone are obtained through the curve.
Owner:CHANGAN UNIV
Pipe-soil dynamic coupling effect analysis method
ActiveCN105184102ASolving Dynamic Coupling ProblemsEffective analytical approachSpecial data processing applicationsOcean bottomDamping factor
The invention discloses a pipe-soil dynamic coupling effect analysis method. The method comprises steps as follows: establishment of a pipe-soil dynamic coupling effect analysis model, determination of a nonlinear hysteretic loop of soil mass according to the maximum depth of a pipeline structure embedded into the soil mass, and the like. The pipe-soil dynamic coupling effect analysis method has the advantages as follows: the influence of various factors such as undrained shear strength of seafloor mud surface soil mass, vertical increment of undrained shear strength of the soil mass, the pipe trench shape, surface roughness of the pipeline structure, the nonlinear hysteresis effect of the soil mass and the like are taken into consideration, support stiffness of seabed soil mass on the pipeline structure and the damping coefficient of the soil mass are determined according to the position and the direction of motion of the pipeline structure, the maximum depth of the pipeline structure embedded into the soil mass is updated in real time according to the motion condition of the pipeline structure, so that one novel pipe-soil dynamic coupling effect analysis method is established, the problem about the dynamic coupling effect of the pipeline structure and the seabed soil mass is solved, and an effective analysis method and reliable theoretical basis are provided for the dynamic coupling effect between the seabed soil mass and the pipeline structures such as a seabed pipeline, a catenary stand pipe and the like.
Owner:TIANJIN UNIV
Rock-soil dynamic information processing system and method based on cloud GIS platform
PendingCN111612405ARealize mobile officeFlexible change of office locationOffice automationGeographical information databasesData packInformation processing
The invention provides a rock-soil dynamic information processing system and method based on a cloud GIS platform. The system comprises a client, a cloud GIS platform server and an office data terminal. The client is configured to collect rock-soil survey data by using the mobile terminal, perform corresponding authority processing on the collected data, package and upload the data to the cloud GIS platform server and the office data terminal, call information to be queried according to an input instruction, and display a query result. The cloud GIS platform server side is configured to receive, set and manage survey tasks, distribute the survey tasks to the corresponding mobile terminals according to different set authorities, and receive and store information fed back by the corresponding mobile terminals. The office data end is configured to interact with the cloud GIS platform server end, acquire field survey data, download survey tasks according to set permission, acquire rock andsoil survey data packets uploaded by the client, perform recheck and comparison, and provide a comparison result and a query data source for the client.
Owner:SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
Vertical layered soil dynamic resistance test method
ActiveCN108761208AEffective simulation of vertical delamination conditionsAccurate assessmentResistance/reactance/impedenceCopper electrodeEngineering
The invention relates to a vertical layered soil dynamic resistance test method. The test method comprises the following steps: a vertical layered soil dynamic resistance test platform is built, and aleft copper electrode and a right copper electrode are arranged on the left side wall and the right side wall of a test box of the test platform; the output end of an impact current generation moduleis connected with the high-voltage end of a high-voltage voltage divider module; the high-voltage end of the high-voltage voltage divider module is connected with the left copper electrode; the rightcopper electrode is connected with the grounding end of the impact current generation module; the grounding end of the impact current generation module is connected to a grounding module; a current acquisition module is used for measuring current flowing through the left copper electrode and the right copper electrode; and when an insulating partition plate is inserted into an experiment box, theexperiment box is divided into more than two spaces from bottom to top. The test method also comprises the steps of measuring the pH value of a soil test product, filling vertical layered soil, measuring the voltage and the current of a soil sample at the current pH value and evaluating the dynamic resistance of the soil. By the vertical layered soil dynamic resistance test method, the surrounding soil vertical layered working condition of the grounding system can be effectively simulated and the dynamic resistance of the soil can be evaluated accurately.
Owner:SOUTHWEST JIAOTONG UNIV
Layered soil dynamic resistance characteristic testing method under different water contents
ActiveCN108872709AEasy to operateImprove accuracyEarth resistance measurementsElectrical resistance and conductanceDrip irrigation
The invention discloses a layered soil dynamic resistance characteristic testing method under different water contents. The method comprises a step of building of a testing system. The testing systemcomprises a soil box with a left copper electrode and a right copper electrode, a digital controller and a drip irrigation device and the like capable of realizing accurate control on a water contentin the box; the output end of an impulse current generator is connected to a high voltage end of a voltage divider, and the high voltage end of the voltage divider is connected with the left copper electrode; the right copper electrode is connected with the grounding end of the impulse current generator; and insulation baffles are also included to divide the soil box to more than two pieces of space from left to right. The testing method also comprises steps of soil filling, water content control, evaluation of voltage and current of a soil ample under the current water content, evaluation ofsoil dynamic resistance characteristics and the like. The surrounding soil horizontal layering working condition of a grounding system can be effectively simulated, the water content can be accuratelycontrolled, and the correlation between the water content in the layered soil and the soil dynamic resistance can be analyzed.
Owner:SOUTHWEST JIAOTONG UNIV
A numerical simulation method for dynamic response centrifuge test of pile foundation in liquefaction site is provided
InactiveCN109214106ASolving Analytical ChallengesEffective prediction of responseDesign optimisation/simulationSpecial data processing applicationsElement modelEngineering
A method for numerically simulating the dynamic response centrifuge test of pile foundation in liquefaction site includes such steps as setting up correct sand-soil solid element model to correctly simulate the experiment environment, and setting up pile-soil dynamic response centrifuge. In the finite element model of soil-soil interaction, the beam element is introduced to simulate the length andthe bar element to simulate the volume. A spring element is added to the soil action node to characterize the pile. At last, the centrifuge test of dynamic response of pile foundation in liquefactionsite is simulated accurately by using proper boundary condition and seismic wave loading method. The centrifuge test numerical simulation method of the invention simplifies the modeling step, improves the calculation efficiency, guarantees the calculation precision, and solves the problem of pile. The analysis of soil-soil interaction is a difficult problem, so it has a wide application prospect.
Owner:JIANGNAN UNIV
Load-displacement relation estimation new method of liquefaction field bridge pile foundation covered with clay bed in earthquake process
ActiveCN104462748AFoundation engineeringSpecial data processing applicationsSoil scienceSoil dynamics
The invention provides a new method for establishing the liquefaction field pile covered with a clay bed-soil dynamic interaction load-displacement to overcome the defect that the soil reaction force solving precision is poor in the process of establishing the dynamic load-displacement, effectively obtain the relativity displacement y of pile soil and ensure the correctness of the liquefaction field pile covered with the clay bed-soil dynamic interaction load-displacement. The new method for establishing the liquefaction field pile covered with the clay bed-soil dynamic interaction load-displacement relates to the technological approach for solving the pile-soil dynamic interaction load-displacement in the field of geotechnical engineering and mainly relates to the five parts of content of the dynamic load-displacement establishing basic theory, the soil layer boundary pile bending moment interpolating function processing method, the pile-soil dynamic interaction force calculating, the pile lateral dynamic displacement solving and the pile soil relative dynamic displacement determining.
Owner:唐亮 +1
Small high-frequency low-stress amplitude soil dynamic triaxial apparatus
PendingCN109060565AReduced measurement accuracyLow costMaterial strength using repeated/pulsating forcesMeasurement precisionMechanics
The invention discloses a small high-frequency low-stress amplitude soil dynamic triaxial apparatus. The apparatus comprises a loading system, an acceleration measuring system, an axial force measuring system, a water pressure measuring system, an air pressure measuring system and a displacement measuring system. The loading system comprises a small electromagnetic vibration table, a piston, a cylinder, a weight, a pushing rod and a pressure chamber and can control static load and dynamic load. The static load is controlled by controlling axial stress and confining pressure. The axial stress is controlled by controlling thrust of the piston and weight of the weight, and the confining pressure is provided by the pressure chamber to achieve a high static stress level. The dynamic load is controlled by the small electromagnetic vibration table which applies inertial force to a sample in form of dynamic load through high-frequency vibration, to realize high vibration loading of high-frequency dynamic load and high measuring precision.
Owner:SHANGHAI JIAO TONG UNIV
Wetland dynamic boundary determination method based on three elements of hydrology, plants, and soils
PendingCN113821925ALow time scale requirementsReduce workloadDesign optimisation/simulationSatellite radio beaconingSoil scienceWetland soils
The invention discloses a wetland dynamic boundary determination method based on three elements of hydrology, plants, and soils. The method comprises the following steps: step 1, extracting a wetland hydrological dynamic boundary; step 2, acquiring wetland vegetation data; step 3, acquiring wetland soil data; step 4, simulating a wetland vegetation and soil dynamic boundary according to the data in the step 1 to the step 3; step 5, determining a wetland dynamic boundary. According to the method, wetland dynamic boundaries under multiple dimensions can be comprehensively and accurately reflected.
Owner:BEIJING NORMAL UNIVERSITY
Multi-data-source roadbed monitoring system and multi-data-source roadbed monitoring evaluation method for saline soil regions
ActiveCN109653185ARoadwaysIndication of weather conditions using multiple variablesAccelerometerData acquisition
The invention discloses a multi-data-source roadbed monitoring system for saline soil regions. The system comprises a micro weather station. The micro weather station mounted in a roadbed site comprises a heat radiation sensor, a wind speed sensor, a rain gauge and a relative humidity meter. A displacement meter, a salt sensor, a volume and moisture content sensor, an accelerometer and an earth pressure sensor, which are buried in a roadbed along the depth direction of the roadbed in a layered mode, are electrically connected with a data acquisition and transmission device mounted in the roadbed site through connection lines. The multi-data-source roadbed monitoring system has the advantages that multi-data sources of the roadbed are acquired by the micro weather station and the data acquisition and transmission device, the acquired data are converted into the soil dynamic modulus, net evaporation rate, salt content and roadbed cumulative deformation before correlation analysis, damageto roads in the saline soil regions, such as pavement frost heaving, roadbed settlement and pavement cracking, are monitored, and the evaluation basis is provided for causes and improvement methods of the damage to roadbeds.
Owner:LANZHOU UNIVERSITY
A pile foundation dynamic reaction centrifuge test numerical simulation method
InactiveCN109241653ASolving Analytical ChallengesEffective prediction of responseGeometric CADDesign optimisation/simulationElement modelEngineering
The invention discloses a pile foundation dynamic reaction centrifuge test numerical simulation method. An experiment environment is correctly simulated by establishing a correct sand soil solid element model. When the finite element model of soil-pile interaction is established, two-dimensional four-node solid pile element is introduced and the constitutive model of pile material is the same as that of the experiment. A spring element is added to the pile-soil action node to characterize the pile-soil dynamic reaction. Finally, the centrifuge test of the dynamic response of the pile foundation in the actual liquefaction site is restored as much as possible by adopting the appropriate boundary conditions and seismic wave loading mode, so that the simulation method can effectively predict the reaction of the free field, single pile and pile group under the dynamic condition. The method simplifies the modeling step, improves the calculation efficiency, ensures the calculation accuracy, and solves the problem that the analysis of soil-soil interaction is a difficult, so it has a wide application prospect.
Owner:JIANGNAN UNIV
Method and device for measuring potential radon concentration of soil by using surface soil dynamics
ActiveCN109030785AStable radon concentrationStable concentrationWithdrawing sample devicesEarth material testingPorosityMeasurement cost
A method and a device for measuring the potential radon concentration of soil by using surface soil dynamics are provided. The method comprises the steps of establishing a differential equation of migration and distribution of radon in soil, sampling surface soil, then establishing a change rule equation by using the change rule of the radon concentration in a closed-loop gas path measuring device, changing the volume of the measuring device to obtain the changes of the radon concentration in the measuring device under different measuring volumes, calculating the generation rate A of radon andthe porosity eta of soil, and calculating the potential radon concentration of soil by using the calculated generation rate A of radon and porosity eta of soil. The values of n measurement periods inthe measuring device are used for nonlinear fitting, without waiting for the radon concentration in the device to be stable, thereby saving the measurement time, simplifying the sampling measurementprocess and the calculation method, reducing the measurement difficulty and saving the measurement cost.
Owner:HENGYANG NORMAL UNIV
Roadbed soil dynamic rebound modulus predicting system and method
ActiveCN104142279BHigh degree of automationQuick calculationBiological neural network modelsInvestigating material hardnessRadial basis function neuralEngineering
The invention relates to a roadbed soil dynamic rebound modulus predicting system and method. The system comprises a soil sampler, an electronic balance, a drying box, a volume-weight tester, a liquid-plastic limit combined tester, a triaxial experiment instrument and a computer. The liquid-plastic limit combined tester comprises a support, an electromagnet, a cone penetrator with a scaleplate, a sample cup, a control switch and a lifting base, wherein the electromagnet is installed in an upper frame of the support, the cone penetrator with the scaleplate is adsorbed to the portion below the electromagnet, the lifting base is installed in a lower frame of the support, the sample cup is located on the lifting base, and the control switch is located on the side face of the lower frame of the support. Compared with the prior art, the roadbed soil dynamic rebound modulus predicting system and method are based on a radial basis function neural network, selected input indexes have defined meanings, a predicting model is high in automation degree, and the roadbed soil dynamic rebound modulus predicting system has the advantages of being high in calculation speed and accuracy, and suitable for engineering realization.
Owner:SHANXI PROVINCIAL RES INST OF COMM +1
Soil sample film loader for earth motion triaxial test
ActiveCN113432941ANot easy to damage the shapeNot easy to break strengthPreparing sample for investigationStrength propertiesSoil scienceTriaxial shear test
The invention discloses a soil dynamic triaxial test soil sample film loader which comprises a triangular fixing device and a film loading device, the triangular fixing device can be divided into a triangular base fixing device and a triangular top frame fixing device through disassembly, and the film loading device can be divided into a soil sample vertical pier, a soil sample sleeve, a soil sample sleeve lifting rod and a rubber film pressing ring through disassembly. One set of film loading device is prepared for each of common soil samples with the diameter of 39.10 mm and the diameter of 50.00 mm; and according to the invention, the problem that the appearance and dynamic strength of soil are easily damaged when a soil sample is loaded by a film loading device in the prior art is solved, the success rate of soil sample film loading is increased, the speed of soil sample film loading is increased, and the labor cost is reduced.
Owner:TIANJIN UNIV
Soil dynamic test device
PendingCN108760541AEffective simulation of liquefactionTrue reflection of dynamic characteristicsMaterial strength using repeated/pulsating forcesPore water pressureEngineering
The invention provides a soil dynamic test device, and relates to the technical field of marine test equipment. The soil dynamic test device comprises a test box. Soil is paved on the bottom of the test box. Seawater is filled in the test box. A pressure measuring mechanism is arranged on the test box. A loading plate mechanism is connected to the upper part of the test box. The loading plate mechanism is connected to a circulation dynamic mechanism and a displacement measuring mechanism. The pressure measuring mechanism is connected to a computer control mechanism. The loading plate mechanismcomprises a plate body with a plane structure and a conical body arranged on the upper part of the plate body. The loading plate mechanism loads a pressure on a plane, the pressure on the middle of the plane is large, and the pressure on the periphery of the plane gradually decreases. A wave like (from wave peak to wave trough) loading effect is generated. The liquefaction situation of soil on asea bed is effectively simulated under the action of waves. The dynamic characteristics of the soil can be represented practically under the action of waves, the pore pressure and soil pressure of thesoil can be accurately measured during the liquefaction process, the operation is convenient, and the test device is practical and economic.
Owner:OCEAN UNIV OF CHINA
Saturated soft soil dynamic triaxial model test device and method
ActiveCN112945725AEasy to installEasy to disassembleMaterial strength using tensile/compressive forcesModel testSoil dynamics
The invention discloses a saturated soft soil dynamic triaxial model test device and method, and belongs to the field of soft soil test devices. The saturated soft soil dynamic triaxial model test device comprises a triaxial apparatus body, the triaxial apparatus body comprises a base and a pressure chamber body, and the lower end of the pressure chamber body is fixedly connected with a connecting base; according to the scheme, an electromagnet adsorption mode is adopted to replace an existing screw connection mode, mounting and dismounting are convenient and fast, the sealing performance is enhanced by arranging the sealing block, the sealing strip and the pressure sealing ball, when leakage occurs, water penetrates through the sealing strip and enters the pressure sealing ball, the color developing block floats upwards to the perspective pipe, a tester can timely know the leakage condition so as to timely close a test instrument and avoid larger leakage, and leaked water is stored in the pressure sealing ball and the perspective pipe and cannot leak to the outside, so that the instrument is protected, and the trouble of cleaning is saved.
Owner:ZHEJIANG UNIV
Tubular pile static bearing capacity testing method and system based on traveling wave tracing principle
ActiveCN114482154AOvercome the disadvantages of time-consuming and labor-intensiveEconomical and convenient testing processFoundation testingEvaluation resultSoil dynamics
The invention discloses a tubular pile static bearing capacity testing method and system based on the traveling wave tracing principle, and the method comprises the steps: arranging sensors on the inner wall of a tubular pile in the axial direction of a pile body, and arranging various types of sensors on the pile body in a one-to-one correspondence manner in a ring shape; hammering the pile top of the tubular pile, and synchronously collecting and recording force wave signals and velocity wave signals of each measuring point of the pile body along the axial direction of the pile body; force waves propagating in the axial direction of the pile body are decomposed into upward waves and downward waves through a traveling wave decomposition method, and pile body traveling wave tracing is achieved; calculating to obtain a dynamic resistance time history curve and a pile end soil dynamic resistance time history curve of each pile section, and determining pile side soil dynamic resistance and pile end soil dynamic resistance; and determining the maximum static bearing capacity of the tubular pile and the ultimate bearing capacity of the pile. According to the method, the static bearing capacity of the pile is directly evaluated through the actually measured pile body dynamic signal, the calculation process does not involve specific parameters of soil around the pile and human factors, and the influence of the property complexity of the soil around the pile and the subjectivity of testers on the bearing capacity evaluation result is effectively avoided.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
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