189 results about "Surface shear" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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%.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention relates to an embedded short strut structure and a construction method of the embedded short strut structure. According to the embedded short strut structure, a position for a short strut is reserved about one third the span away from the area where a steel pipe column is located, other foundation slabs meet the design requirement, a fixing steel angle is arranged at the lower end of the short strut, grouting surface shear-resistant steel bars are arranged between the short strut and a bearing platform, embedded bolts are arranged around the short strut, steel bars are reserved at the broken position of a ground beam or a plate, a water stop steel plate is also arranged, a sleeve is arranged on one side of each reserved steel bar in a straight-thread connection mode, and the other sides of the reserved steel bars are welded. The reserving and embedding operation of the short strut meets the requirement for parallel cross operation of all processes, as a result, the construction period is the shortest, and cost is also lowered.