168 results about "Shear displacement" patented technology

This invention relates to a rock cleavage shearing - seepage coupling test box, the characteristic lay in: box shell includes upper box and lower box, both fitting surface are flat. Inter of upper box and lower box have similar size flute, and two flute together form cavity that can hold rock test piece; Near upper end of left and right wall sheet of lower box have set up water entry and water exit; box shell executed by metal or alloy that has high compressive strength, good water erosion bearing quality. This invention can carry out rock cleavage shearing - seepage coupling test under high infiltration water pressure. because of the designing of sealing device, in the test process water current leakage will not occur when up and down cleavage test piece in conjunction with upper and lower box occurring relative shearing displacement, and still flowing according to predesigned path and mode, so strained condition more fit for nature, data more sincerity, conclusion can serve practical engineering better.

The invention provides a simple, accurate and field airbag-loading potable soft and weak interlayer direct shear apparatus. In the direct shear apparatus, airbag loading is adopted to apply a normal force, and a piston system arranged on the upper part of a reaction frame can guarantee the verticality and application uniformity of the normal force when a sample produces shearing displacement; and a ball screw system applies a tangential force and linear guides under a sample seat can guarantee the horizontality of the application direction of the shearing force and the continuity and smoothness of the tangential force. A normal force applying system avoids bearing load, and airbag pressurization is accomplished by a potable pressurizing device and is high in precision, simple and easy to implement. A tangential force applying system uses a screw handle to apply force and the force application is steady and highly operable. Both the normal force applying system and the tangential force applying system are fixed, small in volume, high in reliability and convenient in on-site test. The test device can perform the quick shearing of field soft and weak interlayer and consolidated drained quick and slow shear tests and is simple, precise and high in operability.

An exhaust pipe decoupler for vehicles including a bellows (10), an outer braid member (20) spaced from the bellows and braided with a predetermined angle, a retainer (30) having a support (31) inwardly curved at both ends thereof for engaging to a ring damper (40), the retainer being affixed to the ends of the bellows (10) and installed between the outer surface of the bellows (10) and the outer braid member (20) to prevent direct contact thereof, the ring damper (40) located outward the support (31) formed in the retainer (30), a fixing cap (50) coupled to the outer diameter of the outer braid member (20) in order that the outer braid member (20) and the retainer (30) are located outward the bellows (10), wherein the outer braid member (20) absorbs tension in excessive outer forces, i.e., displacement of tension and compression, and the ring damper (40) controls the displacement of compression and shear displacement by the ring damper (40), thereby controlling the bellows within the elastic range.

The invention relates to a site large-scale direct shearing test device of the shearing strength of a concrete and basement adhesion surface, comprising two sets of independent pile foundation static load test systems, a bracket stand column, a cross beam, a counter-force beam, a longitudinal beam, a protective cylinder, a base plate and a force transferring block. One set of pile foundation static load test system controls the vertical displacement data collection application to the load and is connected to the top surface of a trail body below the counter-force beam; the other set of pile foundation static load test system controls shearing load application and shearing displacement data collection and is arranged between a concrete backseat and the side of the trail body; the cross beam is arranged above the bracket stand column; the counter-force beam is connected below the cross beam; the protective cylinder is connected with the cross beam through the longitudinal beam; and one side of the force transferring block is connected with the pile foundation static load test system and the other side is connected with the concrete trail body through the base plate. Compared with the prior art, the invention solves the problems of unstable loading system and complex counter-force system, really realizes full automation of static load test and has the advantages of strong applicability, wide application and higher precision.

Methods and systems for improving correlation of shear displacement waveforms are presented. The method includes delivering one or more reference pulses to a plurality of target regions to detect corresponding initial positions. Further, a plurality of pushing pulse segments are delivered to one or more pushing locations, where one or more parameters corresponding to the plurality of pushing pulse segments are adapted for generating a shear displacement waveform with a desired wave shape. Additionally, one or more tracking pulses may be delivered to the plurality of target regions for detecting displacements of at least a subset of the target regions as a function of time. Particularly, the displacements are determined as time samples of the shear displacement waveform. Subsequently, a shift between the shear displacement waveform detected at least two different target regions in the subset of the plurality of target regions is detected.

The invention discloses a high-precision geotechnical single-shear instrument and a use method thereof. Grooves are arranged on the outer wall of each shear ring in the upper shear stack ring group, and a plurality of horizontal displacement sensors and a lower horizontal displacement sensor box are arranged in the horizontal displacement sensor box. The shearing box and the upper shearing ring group are connected; two vertical displacement sensors are placed on the loading top cover; the horizontal electromagnetic exciter is fixed on the base through a jack; the shearing box is connected to the horizontal electromagnetic exciter The level pipe is arranged on the dowel rod horizontally of the device. When in use, the shear force is guaranteed to be applied in the horizontal direction through jack adjustment and level pipe monitoring; the shear displacement generated by each shear ring in the lower shear box and the upper shear stack ring group is collected through the horizontal displacement sensor box; A vertical displacement sensor collects the normal displacement of the sample in the upper shear stack ring group under the action of cyclic shear force. The invention has a simple structure, is easy to implement, and can measure the deformation characteristics of the contact surface between the soil and the structure with high precision.

The invention discloses a tension-shear coupling characteristic tester of an asphalt concrete material. The tester comprises a temperature control box, vertical uploading control system for shearing a load, a transverse uploading control system for tensioning or compressing the load, and a coupling characteristic testing centre for controlling the temperature of the temperature control box, the vertical uploading and the transverse uploading and obtaining a tensioning stress and a shearing stress in the horizontal direction according to fitting of a tensioning-compressing displacement and a shearing displacement; a station platform for placing the asphalt concrete material to be tested is arranged in the temperature control box; the vertical uploading control system comprises a vertical oil cylinder, a vertical servo valve, a vertical displacement sensor and a vertical uploading controller; the transverse uploading control system comprises a transverse oil cylinder, a transverse servovalve, a horizontal displacement sensor and a transverse uploading controller; and the vertical uploading controller and the transverse uploading controller both are connected with the coupling characteristic testing centre. The tension-shear coupling characteristic tester of the asphalt concrete material can test the tension-shear coupling characteristic at controllable temperature.

The invention discloses a test system for the water tightness test of a tunnel deformation joint waterstop, which comprises two steel tanks mounted, in a sealed manner, at two sides of a waterstop to be tested, a steel structured test bench, an atmospheric pressure test bench, a hydraulic pressure test bench, an air compressor, a remote-distance full-automatic observing and reading apparatus and a safety protection device. The test device of the invention can be used for the water tightness test of a plurality of waterstops, realize random opening displacement and shear displacement accurately, and simulate the stress condition of deformation joint waterstop structure under different working conditions by applying atmospheric pressure in balloon to a tested object through the atmospheric pressure test bench and applying hydraulic pressure to the steel tanks through the hydraulic pressure test bench to simulate seawater pressure. The system and the method are suitable for the test of OMEGA and GINA waterstops as well as expandable waterstop.

To predict residual settlement quantity and residual horizontal deformation quantity of ground where a liquefaction phenomenon has occurred due to earthquake. Soils in situ (stratum B to stratum D) are sampled from ground, and are made to be element test object stratums. A stratum whose characteristic is well-known, or the like may be substituted for a numerical model (stratum A). Next, setting of input conditions is performed, and vertical stress, horizontal stress and initial shear stress, which are equivalent to applied load that the ground at a depth of the point suffers, are worked on to each stratum. This recreates a stress status of soil before earthquake occurs. Then, shear displacement and the movement quantity of interstitial water by earthquake are given to the test piece, and the quantity of shear stress and pore water pressure, which have occurred, is obtained. In the element test execution stratum, displacement computed for stratum element and the movement quantity of interstitial water are actually given to each element to measure restoring force and the pore water pressure. By sequentially repeating the steps, it is possible to simulate the behavior of the liquefaction phenomenon.

The invention discloses an anti-pulling, limiting and earthquake-insulating device integrated by guide rails and vertical ropes, wherein the device comprises an upper connection plate, a lower connection plate, a bearing main body, an upper guide rail, a lower guide rail, sliding blocks, limiting baffles and vertical ropes, wherein the vertical ropes are connected with the bearing main body in parallel; the upper guide rail and the lower guide rail are respectively connected with the upper connection plate and the lower connection plate; the upper guide rail and the lower guide rail are cross-shaped; sliding cavities are formed in the guide rails; the sliding blocks can slide in the cavities along the guide rails; the limiting baffles are arranged at two ends of the cavities; the vertical ropes are fixed between an upper sliding block and a lower sliding block. According to the anti-pulling, limiting and earthquake-insulating device, the sliding blocks slide along the guide rails; the ropes retain the vertical state all the time, so that the ropes can supply effective tension when a bearing of the device has the designed shear displacement; meanwhile, when the bearing has great deformation, the sliding blocks move to the limiting baffles; the ropes obliquely pull and can limit the continuous great deformation of the bearing, so that the anti-pulling and anti-overturning performances of building structures under the action of multi-dimensional earthquake and wind load can be improved.

The invention relates to a mechanical property test device, in particular to a test device for observing the mechanical property of an interface between underwater soil and a structure, which is especially suitable for researching the mechanical property of the interface between the underwater soil and the structure in a hydraulic building (structure). The test device comprises a fixing mechanism, a horizontal movement mechanism, a soil box and a loading system, and an electro-hydraulic servo movable and static universal testing machine is used as a main machine frame. A designed soil material is loaded in the soil box fixed on the horizontal movement mechanism. A structure test block is arranged on an upper chuck of the electro-hydraulic servo movable and static universal testing machine, a normal stress is applied through the vertical loading system, and the shear mechanical behavior of the interface between the underwater soil and the structure under normal stress and complex stress paths can be represented through the horizontal loading system. The normal force and the shear force in the interfere shear test are measured through a load sensor, a vertical displacement meter arranged on the top surface of the structure test sample is used for measuring the normal displacement of the interface in the test, and horizontal displacement meters arranged on two sides of the soil box are used for measuring the shear displacement in the test.

The invention provides a symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength. The symmetrical direct shear apparatus comprises a bracket; two shearing deviceswhich are distributed symmetrically are arranged on the bracket; each shearing device comprises a shearing box, a fan-shaped distribution type normal force providing mechanism which is used for applying normal force to a soil sample in the shearing box, a shearing displacement mechanism which is used for measuring the shearing displacement of the shearing box, and a counterweight which is used forapplying shearing force to the shearing box. The invention also provides a method for the in-situ testing of the pile-soil interface shear strength. The symmetrical direct shear apparatus and the method have the beneficial effects that the normal force which is distributed uniformly is applied by utilizing the fan-shaped distribution type normal force providing mechanism without externally connecting a pressure source or loading equipment; the magnitudes of the normal force at various points of the interface are the same and point to a circle centre by applying the normal force through the fan-shaped distribution type normal force providing mechanism in the centre of a sample, so that a shearing surface is stressed uniformly, and the deviation of test results caused by the fact that the sample is loaded eccentrically is avoided.

The invention provides an apparatus and method capable of simulating action of a soaking-air drying cycle and used for direct shear test of soil. The apparatus comprises a testing stand, an air-water exchanger and a support, wherein the air-water exchanger is connected with a water storage tank through a pipeline, the water storage tank is communicated with a water storage groove pm the testing stand via a water inlet pipe, and the testing stand is installed on the support. In a shearing device on the testing stand, the two interior side surfaces, located at a non-shear displacement direction, of the water storage groove are provided with heating plates; the heating temperature and time of a temperature sensing and controlling instrument are set to control the process of heating and drying of a soil sample by the heating plates; and the air-water exchanger communicated with the water storage tank realizes monitoring and measurement of water pressure in the water tank by converting air pressure into hydraulic pressure. The apparatus can directly carry out drying-wetting cycle operation and related direct shear test on a soil sample in a shearing box, avoids tedious manual operation, improves testing efficiency and reduces errors brought by manual operation.

The invention discloses a method for testing dynamic shear properties of an aggregate-mortar transition region. The test method comprises the following steps of A, manufacturing a test piece divided into two parts of an aggregate part and a cement mortar part along the axial direction, B, applying an axial load to the test piece, applying shear loads to the test piece and measuring corresponding shear displacements simultaneously, and drawing a shear load-shear displacement curve of an aggregate-mortar interfacial layer of the test piece according to the shear loads and the corresponding shear displacements, wherein the shear displacements occur under the axial load, C, adjusting a value of the axial load and repeating the step B to obtain shear bearing capacities under different axial loads, and D, drawing a shear bearing strength line, wherein axial loads are utilized as abscissa values; shear bearing capacities are utilized as ordinate values; an included angle of the shear bearing strength line and its abscissa axis is equal to an internal friction angle of the aggregate-mortar interfacial layer; and the ordinate axis intercept is equal to a cohesive force of the aggregate-mortar interfacial layer. The invention also discloses a device for testing dynamic shear properties of an aggregate-mortar transition region. Through the invention, dynamic shear mechanical properties of a concrete interfacial layer under different strain rates can be determined accurately.

The invention belongs to the technical field of the civil engineering (rock-soil) and geological engineering, and discloses a full-automatic direct shear apparatus for densely compacted bentonite unsaturated shear property study. The apparatus mainly comprises a shear system, a normal pressure loading system, a measurement system, an automatic control and data collection system, a gas-phase methodsuction control system; the shear system realizes a shear rate or continuous loading and unloading of shear force by adopting a servo motor; the normal pressure loading system adopts realize the continuous loading and unloading of normal stress by adopting an air compressor and a rolling diaphragm cylinder; the measurement system measures normal displacement, shear displacement and the shear force by adopting a high-precision sensor; the automatic control and data collection system automatically controls test process, data collection and display through computer software; and the gas phase method suction control system controls environment humidity in a shear box seal housing through a saturated salt solution and a combined seal housing. The automatic test on the densely compacted bentonite unsaturated shear property is realized.

The invention relates to a test method for studying rock joint surface morphology evolution in a whole shear process. The method includes: using an artificial rock material to copy a rock joint surface to obtain multiple groups of joint samples with completely identical surface morphology, scanning all the joint samples before testing to obtain joint surface initial morphology data; conducting a group of joint shear test to obtain a complete joint shear displacement-shear stress test curve; in the follow-up study process, selecting shear displacements corresponding to different joint shear stress states, and performing multiple groups of joint shear test, stopping each group of test at different shear displacement positions, then scanning the joint surface morphology data obtained by the groups of test, and performing comparison with the morphology data of each sample before test so as to obtain morphology evolution data in the joint shear process. Compared with the prior art, the method provided by the invention has the advantages of simplicity and convenience, more accurate and reliable test result, good repeatability and wide application range, thus having very good application prospect.

The invention provides a rheological direct-shear test device based on an electromagnetic force. The rheological direct-shear test device based on the electromagnetic force comprises an electromagnetic force loading system which uses the electromagnetic force to apply a tangential force to a soil sample or an axial force and the tangential force to the soil sample. According to the invention, the electromagnetic force loading system applies pressure to the soil sample, essentially, the electromagnetic force generated between electromagnets is applied to the soil sample in a certain way to carry out a rheological direct-shear test on the soil sample by using electromagnet principles. Through the method, the force applied to the soil sample is controllable and adjustable, and loaded stably; and the rheological direct-shear test device based on the electromagnetic force can accurately test to obtain a shear force value applied on a critical point when the soil sample has shear deformation, and can accurately measure a relationship between a soil sample applied force and shear displacement, thereby helping to deeply study rheological properties and rules of the rheological properties to effectively improve the operability of the test and the accuracy of test data, so that the rheological direct-shear test device based on the electromagnetic force disclosed by the invention has broad application prospects in the aspect of the rheological direct-shear test on the soil sample, and is small in size, low in cost and suitable for general application.

An elastic roll out boom includes a thin wall, tubular, elongate structure having a plurality of interlocking elements disposed in spaced-apart relation along the surface thereof. The elastic roll out boom is configured to be flattened and rolled tightly to form a roll in a stowed configuration. The plurality of interlocking elements are positioned such that a first interlocking element engages a second interlocking element when the elastic roll out boom is in the stowed configuration. This prevents shear displacement between layers of the roll out boom.

The invention discloses a sealing device for a shear test under multi-field coupling action of rock fracture. The sealing device comprises upper pressure blocks, lower pressure blocks and seal rubber sheets, and the seal rubber sheets are used for crimping and deforming along with increase of shear displacement in a shear process. Rock samples are put in rigid shear boxes, the upper pressure blocks and the lower pressure blocks are placed on two sides of the rock samples in the shear direction, and a gap allowing placement of each seal rubber sheet is reserved between each upper pressure block and the corresponding lower pressure block. The upper end of each seal rubber sheet is connected with the corresponding upper pressure block, and the lower end of each seal rubber sheet is connected with the corresponding lower pressure block. A hollow water storage chamber is formed between each seal rubber sheet and a fracture seepage surface of the corresponding rock sample, the hollow water storage chamber on one side is communicated with a water inlet, and the hollow water storage chamber on the other side is communicated with a water outlet. The sealing device for the shear test under multi-field coupling action of rock fracture is effective in avoiding of water leakage and high in stability.

The invention relates to a contact surface bidirectional shear test device, comprising an upper shear box, a lower shear box, a normal pressure device, an X/Y direction shear transmission device, an X/Y direction thrusting device, an X/Y direction moving device and a data collection device. According to the device provided by the invention, the upper shear box is fixed, the lower shear box can perform shear in the X/Y direction by means of the X/Y direction shear transmission device to generate a shear displacement, the contact area of upper and lower samples remains unchanged during the test,and there is no need to correct the area. The device can also study the mutual embedding characteristics of soil bodies made of different materials by applying normal loads. The device provided by the invention can test the stress deformation characteristics in the X/Y direction and the mutual embedding characteristics in the normal direction of the contact surfaces of soil bodies with differentengineering characteristics, and the indoor experimental research on the stress deformation characteristics of the contact surface in different directions is achieved. During the test, the applicationof load, shear displacement and shear rate setting and data collection are all controlled by a computer, and the test device has high measurement accuracy, simple and easy operation, and a low test cost.

The invention provides a double-structural surface direct shear test method for researching sliding type rockburst mechanism. The method comprises the following steps: manufacturing a rock sample with a square cross section; successively forming double parallel structural surface by the rock sample under a brazilian split condition; performing 3D scanning on the double parallel structural surface, thereby acquiring a three-dimensional digital model of the double parallel structural surface and calculating roughness thereof; putting the rock sample onto a shear tester, mounting an acoustic emission monitoring probe on the bottom lateral surface, and performing direct shear test on the sample under normal stress condition while monitoring an acoustic emission signal of the rock test piece; collecting the shearing time, shearing stress, shearing displacement and acoustic emission signal data in the shear test process; accordingly analyzing the sliding type rockburst mechanism of the rock sample. According to the invention, a simplified rock system with mutual effect and mutual influence of structural surface and rock is constructed in a laboratory, so that a more reliable test method can be supplied for researching, early warning for and forecasting the sliding type rockburst mechanism.

The invention discloses a control method for the dynamic shearing displacements of a flying shear of a hot continuous rolling mill. The control method comprises the following steps: setting a standard roll speed and initial head shearing lengths, and obtaining the thicknesses of strip steels through measurements; calculating according to the standard roll speed and through an experimental combination with an actual roll speed during actual working to obtain the velocity compensation factors of the strip steels; obtaining a primary shearing compensation quantity; carrying out a secondary amendment on the primary shearing compensation quantity by virtue of the velocity compensation factors of the strip steels, and finally obtaining actual head shearing displacements. According to the control method disclosed by the invention, the shearing displacements are compensated by combining with the changes of the shearing angles of the strip steels with different thicknesses during the shearing of the flying shear and the depreciation condition of the flying shear, and then a compensation result is secondarily amended according to the characteristics of the strip steels during a shearing process and by virtue of the velocity factors, thus realizing high-accuracy shearing control.