247 results about "Internal friction" patented technology

The invention belongs to a complex lithofacies shale reservoir structure weak plane mechanical parameter determination method and system, and belongs to the field of unconventional shale oil and gas reservoir transformation. The method comprises the following steps: carrying out a nanoindentation experiment test on a rock core sample containing a structural weak plane to obtain a macroscopic uniaxial elastic modulus and macroscopic fracture toughness of the structural weak plane; constructing a particle flow discrete element numerical model; on the basis of construction of the particle flow discrete element numerical model and the macroscopic uniaxial elastic modulus and the macroscopic fracture toughness of the structure weak plane, particle flow micromechanical parameter calibration is carried out; and obtaining the mechanical parameters of the weak plane of the structure based on particle flow microscopic mechanical parameter calibration. According to the method, the compressive strength, the elastic modulus, the Poisson's ratio, the cohesion, the internal friction angle, the fracture toughness and the tensile strength of the structure weak plane can be rapidly and accurately predicted, the defect that an existing indoor physical experiment device cannot measure mechanical parameters of a non-standard sample is effectively overcome, and input parameters are provided for fine simulation of hydraulic fracturing of a complex lithofacies shale reservoir.

The invention discloses a narrow foundation pit upheaval resistance stability calculation method, which comprises the following steps: acquiring actual length, width and depth dimensions of a foundation pit and a consolidation undrained strength index, cohesion ccu and an internal friction angle phi cu of a field soil layer, and calculating a type critical width according to an improvement formula considering the internal friction angle of soil and a first width calculation coefficient, and whether the foundation pit is the narrow foundation pit or not is determined according to the comparison result of the actual foundation pit width and the type critical width. When the actual foundation pit is determined to be the narrow foundation pit, the width of a sinking soil body on the side face of the foundation pit is reversely solved through an improvement formula considering the internal friction angle of soil and the width of the actual foundation pit, and the upheaval-resistant stability coefficient of the narrow foundation pit based on the foundation bearing capacity mode is calculated and compared with the upheaval-resistant stability coefficient of the arc sliding mode. And taking the smaller value as the anti-upheaval stability coefficient of the narrow foundation pit so as to evaluate the anti-upheaval stability of the pit bottom of the foundation pit. Therefore, the problems that in the related technology, the judgment standard of the narrow foundation pit and selection of the slip plane are unreasonable, preconditions for checking calculation according to the narrow foundation pit design are unknown, and the friction angle in the stratum is not considered are solved.

The invention provides a method and a system for determining a failure mode and an anchoring length of a steep dip thin-layer slope. The method comprises the following steps of: performing a drilling experiment in a partially excavated area of a slope to be supported; obtaining a rock mass relaxation depth test value LM, a rock mass longitudinal wave velocity mean value Cp1 within a relaxation range, a rock mass longitudinal wave velocity mean value Cp0 outside the range and a layer thickness delta of a side slope lamellar rock mass; establishing a spreading joint model for the slope to be supported; a damage coefficient D is constructed based on a material constant R, a rock mass longitudinal wave velocity mean value Cp1 within a relaxation range, a rock mass longitudinal wave velocity mean value Cp0 outside the range and a layer thickness delta of a side slope lamellar rock mass; based on the rock mass relaxation depth test value LM and the damage coefficient D, the deformation modulus E0, the layer cohesive force cL0 and the friction angle phi L0 in the layer of the spreading joint model are corrected; and calculating the relaxation depth by adopting the corrected spread joint model so as to determine failure modes and anchoring lengths of different anchoring points.

The invention relates to the field of bevel gear pair friction-flash temperature characteristic calculation, and particularly discloses a bevel gear pair friction-flash temperature characteristic calculation method under real machining surface conditions. Comprising the following steps: calculating oil film shear stress, shear modulus and tooth surface micro-bulge contact shear stress in a helical gear meshing process by adopting a non-Newtonian fluid model and a micro-bulge contact model; summing the shearing stress of the oil film and the shearing stress of the micro-bulge, and performing integration to solve the friction force of the contact domain in the meshing process of the bevel gear and the friction coefficient in the single-tooth meshing period of the bevel gear; coupling oil film shear stress, micro-convex body contact shear stress and relative slippage of two interfaces, and solving heat generated by a tooth surface contact domain in the meshing process through a heat distribution model; substituting the obtained heat into a second kind of Volterra integral equation based on a fast moving heat source model, and calculating the interface flash temperature by adopting an iteration method; and the obtained interface flash temperature is reversely brought back to the non-Newtonian fluid model, and repeated iteration is carried out until convergence.

The novel high-damping foil aerodynamic bearing with the negative Poisson's ratio effect is mainly characterized in that a 3-D double-V-shaped honeycomb supporting structure serves as a flexible supporting unit and is integrally formed through 3D printing, and damping material silica gel is poured into the bearing. In the operation process, a high-pressure gas film generated by a wedge-shaped space formed by matching of the rotor rotating at a high speed and the top foil can cause deformation of the 3-D double-V-shaped honeycomb supporting structure in the radial direction, and the negative Poisson's ratio effect is stimulated. At the moment, coulomb friction is generated between the supporting structure and the top foil and between the supporting structure and the bearing sleeve, meanwhile, shrinkage deformation of the supporting structure is limited by damping material silica gel poured in the supporting structure, and internal friction is generated in the damping material silica gel to consume energy. Therefore, coupling of the 3-D double-V-shaped honeycomb supporting structure and the damping material silica gel can provide proper rigidity and high damping capacity for the foil aerodynamic bearing.

The invention discloses a special fluidizing agent for covering C70 concrete outside an arch ring as well as a preparation method and application of the special fluidizing agent. The fluidizing agent is formed by compounding nano silicon wafers, superfine limestone powder, floating beads and superfine talcum powder, all the components have a synergistic effect, and the flowability of the concrete is improved through different mechanisms. The nanometer silicon wafer provides high specific surface area and active surface groups, lubrication among particles is promoted through electric coupling and ion excitation effects, internal friction resistance of the concrete is reduced, and the later strength of the concrete is improved through a volcanic ash reaction after hardening. The superfine limestone powder releases free water by destroying a flocculation structure, and plays a filling role. The floating beads serve as micron-sized spherical particles, and friction force among the particles is reduced. The superfine talcum powder has a sheet structure, and plays a role in dispersing and lubricating the cementing material. The fluidizing agent can be applied to large-flow-state and high-crack-resistance C70 concrete wrapped outside an arch ring, the problems that high-strength concrete is insufficient in fluidity and high in shrinkage cracking risk are effectively solved, and the construction performance and the engineering quality are improved.

A tunnel grouting reinforcement testing device suitable for stratified rock mass comprises the stratified rock mass formed by mutually stacked rock slices, the stratified rock mass is inserted into a mounting groove of a rock mass mounting frame, and the rock mass mounting frame is placed in a grouting model device. The grouting model device is matched with a water injection device, a grouting device, a ground stress loading device and a standard test piece processing device. The layered rock mass is mounted through the rock mass mounting frame, and the grouting reinforcement effect of the layered rock mass with different grouting pressures, different joint cohesion and internal friction angles and different joint crossing angles under the combined action of different water pressures and different ground stress environments is simulated and obtained in the grouting model device.

The invention discloses a prediction method, device and equipment for the abrasion loss of a hob and a shield tunneling machine, and relates to the technical field of tunnel construction, and the prediction method for the abrasion loss of the hob comprises the steps that first positive force borne by rolling rock breaking of the hob is determined through rock strength, penetration and geometrical parameters of the hob; determining a second positive force borne by the hob when the hob slides to cut the soil layer according to the geometrical parameters, the internal friction angle, the cohesive force and the penetration of the hob and the mechanical action between the hob and the muck; determining a basic hob abrasion loss model based on the sum of the first energy action of the hob in the rock stratum and the second energy action of the hob in the soil layer, the hob ring hardness of the hob and the abrasion coefficient; and predicting the accumulated abrasion loss of the hob according to the shield tunneling ring number and the basic hob abrasion loss model. By executing the steps, the prediction accuracy of the abrasion loss of the hob can be improved.

The invention discloses a numerical simulation method for a shear test of rock mass structural surfaces with different roughness, and belongs to the technical field of metal mine mining methods. According to the technical scheme, five typical structural plane contour lines are selected as models, a joint roughness coefficient JRC is checked by solving a root-mean-square Z2 of discretized mesoscopic node coordinates on a structural plane curve, and a check result is taken as a selected joint roughness coefficient JRC value to carry out a triaxial compression numerical simulation experiment; constructing a numerical model of a three-axis compression numerical simulation experiment of rocks penetrating through the structural plane with different roughness, and selecting structural plane model features and parameters; analyzing the influence of the roughness and the friction angle on the mechanical property of the structural surface; and carrying out structural surface shear strength comparison verification of different strength criteria and equivalent internal friction angle parameter verification analysis of structural surfaces with different roughness on a simulation result. According to the method, the interference of test equipment and uncertain factors is reduced, many factors which are not considered in tests are considered, and the numerical simulation result is more scientific and reasonable.

The invention discloses a slope instability assessment method based on deformation monitoring data, and relates to the field of slope engineering monitoring data analysis, and the method comprises the steps: obtaining the related data of the landform, stratum, foundation monitoring points and the like of the surrounding range of a slope; fitting a potential sliding surface according to the distribution and deformation of the deformation foundation monitoring points; establishing a three-dimensional finite element model of the side slope, and determining the cohesive force and the internal friction angle of a potential sliding surface through inversion; carrying out reduction calculation on the inversion cohesive force and the internal friction angle of the sliding surface by adopting a strength reduction method, and determining the safety coefficient of the slope; determining the sliding direction of the side slope according to the horizontal displacement direction of the foundation monitoring point and the potential unstable slope body; and finally, the side slope, the potential unstable slope body and the sliding direction of the potential unstable slope body are displayed through a visual platform, and the volume of the potential unstable slope body and the safety coefficient of the side slope are displayed through characters. According to the method, the three-dimensional sliding surface of the side slope is determined through curved surface fitting, the safety coefficient of the side slope is calculated through parameter inversion and a strength reduction method, and early warning description of the side slope instability form including the instability volume, the instability direction and other characteristics is achieved.

The invention discloses a damping rubber composition for a track fastener and a preparation method thereof. The damping rubber is characterized by being prepared from the following raw materials in parts by weight: 100 parts of composite rubber, 25-35 parts of damping particles, 15-20 parts of sheet structure filler, 5-10 parts of a plasticizer, 5-10 parts of a tackifier, 3-5 parts of high-temperature-resistant fibers, 2-4 parts of a vulcanizing agent, 3-5 parts of an activating agent, 2-2.5 parts of an accelerant and 1-3 parts of an anti-aging agent, the composite rubber is a compound of ethylene propylene diene monomer, natural rubber and nitrile rubber; the damping particles are elastic particles obtained by filling aerogel nanopores with asphalt and a glycidyl methacrylate modified elastomer. The damping particles are dispersed in a rubber system, the activity capacity of a rubber molecular chain is enhanced, remarkable internal friction is generated to consume energy and generate hysteresis deformation, and the damping particles are used for an elastic cushion of a track fastener and have excellent damping performance, ageing resistance and load impact fatigue resistance.

The self-adaptive staged energy consumption friction-shear yield composite damper comprises a friction energy consumption unit, an inner friction plate, an outer friction plate, at least two shear energy consumption units and an H-shaped steel plate, wherein the inner friction plate and the outer friction plate are located on the friction energy consumption unit, and the H-shaped steel plate is located at the tail end of the friction energy consumption unit and used for fixing the friction energy consumption unit. The prestressed bolt sequentially penetrates through the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit and is connected with the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit through at least one pair of linkage rods, and the two ends of the friction energy dissipation unit are connected to beam-column joints respectively. The linkage rod does not make contact with a linkage rod penetrating hole of the shearing energy dissipation unit during displacement, and only the friction energy dissipation unit works; and the linkage rods make contact with the linkage rod penetrating holes in a displacement mode, the shear energy dissipation devices are fixed, the shear plates are subjected to shear deformation, and the earthquake displacement response of the structure is effectively reduced through staged energy dissipation and the displacement amplification effect.

The invention discloses a strong-combination wide-temperature-range wear-resistant composite coating, and relates to the technical field of solid lubricating materials, the composite coating comprises a transition layer, a functional inner layer, a diffusion barrier layer and a functional outer layer which are sequentially formed on the surface of a matrix, the transition layer is a Mo layer and a Mo2N layer, the functional inner layer is a MoAgN layer, the diffusion barrier layer is a Mo2N layer, the functional outer layer is a MoAgN layer, and the functional inner layer is a MoAgN layer. The functional outer layer is a MoAgN layer, and the MoAgN layer comprises a Mo2N phase and an Ag phase. The invention further discloses a preparation method of the composite coating and application of the composite coating in the field of solid lubrication protection. The composite coating is good in film-substrate binding force and low in friction coefficient and wear rate in a wide temperature range, damage to key mechanical parts in the air foil bearing caused by high-temperature lubrication failure can be avoided, and the tribological performance of the bearing parts under the working condition of the wide temperature range is improved.

The present invention discloses a rapid eject hole saw having a serrated shape at the top and being provided with a projection on its inner face, the saw being provided with a guide drill bit which includes a projection on its surface, so that the projection of the guide drill bit is aligned in the same direction as the inner projection of the crown. Advantageously, the defined configuration allows the external projection of the drill bit to also reach the surface at the same time as the top of the crown reaches the surface, and initiates the process of tearing the material to be drilled around the guide drill bit to thus create a gap between the guide drill bit and the waste disc of the drilled material.

The invention provides a water-based damping coating and a preparation method thereof, and relates to the technical field of coatings. An amine compound reacts with polyurethane to form a urea bond, so that a highly-crosslinked polyurethane network structure is formed, and the damping performance is enhanced; meanwhile, a modified nano material is introduced to increase the internal friction force of the material, and a dispersed multi-phase structure can also be formed in a polyurethane matrix, so that crack expansion and energy transfer are effectively hindered, and more mechanical energy is consumed; in the introduced surface acid etching hindered phenol / epoxy microspheres, large groups in an antioxidant AO-80 structure can generate internal friction in a deformation process so as to increase energy dissipation; the epoxy resin is used as a matrix of the microspheres, and can form relatively strong interface interaction with a polyurethane matrix, so that energy can be further dissipated, and the damping effect can be enhanced; the surface roughness of the hindered phenol / epoxy microspheres is increased through surface acid etching, and the physical binding force between the microspheres and a polyurethane matrix is enhanced.

The invention belongs to the technical field of metal ropes, and provides a high-oil-content coated metal rope and a preparation method and application thereof.The coated metal rope comprises a metal rope body and a plastic outer layer coated on the outer surface of the metal rope body, and the metal rope body comprises a core wire containing first lubricating oil and a side wire containing second lubricating oil; the side wire is wound on the outer surface of the core wire, and the flash point of the first lubricating oil is 20-30 DEG C higher than the melting temperature of the plastic outer layer; the flash point of the second lubricating oil is 50 DEG C higher than the melting temperature of the plastic outer layer. According to the method, in the plastic outer layer coating process, the oil volatilization amount can be greatly reduced, plastic outer layer swelling, bubble existence and coating failure are avoided, the prepared high-oil-content coated metal rope is good in self-lubricating performance, internal friction and breakage of the metal rope can be greatly reduced, and the high-oil-content coated metal rope can be applied to a driving mechanism of a vehicle side sliding door.

The present application provides a friction material, a brake friction pad and a preparation method thereof, and a brake friction pair. The friction material includes the following components: 20% to 60% of a first damping material, 8% to 29% of a second damping material, 10% to 20% of an adhesive, 3% to 15% of spherical alumina, 3% to 20% of zirconium silicate, 3% to 10% of stannous sulfide, and 3% to 15% of chromite; wherein the first damping material includes a chrome steel alloy, a manganese copper alloy, and a cast iron alloy; and the second damping material includes vermiculite and porous graphite. The present application uses a first damping material with an excellent attenuation coefficient and an inorganic second material with a porous structure to prepare a friction material; the first damping material can convert external mechanical vibration energy into internal friction heat energy, thereby reducing vibration intensity; the porous structure of the second damping material can absorb and reduce the transmission of brake vibration energy, thereby reducing brake vibration and noise.

The invention discloses a high-damping NiTip / Al composite layer on the surface of an aluminum alloy and a preparation method of the high-damping NiTip / Al composite layer. NiTi particles are introduced into the surface of the aluminum alloy through a stirring friction machining technology, and the NiTip / Al surface composite layer is successfully prepared. The NiTip / Al composite layer on the surface of the aluminum alloy has excellent low-temperature and room-temperature damping performance, and the damping performance of the NiTip / Al composite layer is obviously superior to that of an aluminum matrix material. The maximum internal friction values of the surface composite layer can reach 0.0126, 0.0116, 0.0120, 0.0122 and 0.0105 respectively at room temperature (27 DEG C),-90 DEG C,-55 DEG C, 0 DEG C and 60 DEG C respectively, and are 2.17 times, 2.64 times, 2.31 times, 2.18 times and 1.78 times of the internal friction values of the corresponding aluminum matrix material respectively, and the internal friction values of the surface composite layer can reach 0.0126, 0.0116, 0.0120, 0.0122 and 0.0105 respectively at room temperature (27 DEG C),-90 DEG C,-55 DEG C, 0 DEG C and 60 DEG C. NiTi particles in different aging states are adopted as reinforcing phases, so that the damping performance of the surface composite layer can be effectively improved, and the phase change damping temperature zone of the surface composite layer can be regulated and controlled according to actual needs.

The utility model discloses a damping bearing seat assembly, including bearing body, bearing sleeve frame and bearing seat, bearing body is fixed in bearing sleeve frame, the bottom end of bearing sleeve frame is fixed connection with mounting plate, threaded rod passes through the through-hole on mounting plate and then is threaded connection with threaded groove, the bottom end of mounting plate is fixed connection with the flashboard, and the flashboard is fixed on the bearing sleeve frame. The two sides of the insertion plate are fixedly connected with external damping layers, and the insertion plate is inserted into an insertion groove in the bearing seat. According to the vibration reduction bearing seat assembly, when the bearing body operates and vibrates, the mounting plate is fixedly mounted in the butt joint groove to achieve the primary rigid vibration reduction effect, meanwhile, the bearing body and the bearing sleeve frame transmit vibration to the inserting plate, internal friction is generated between the external damping layer on the outer side of the inserting plate and the internal damping layer on the partition plate, and the vibration reduction effect is achieved. Vibration energy is converted into heat energy through internal friction between the external damping layer and the internal damping layer, and the vibration reduction effect is achieved.

Motor unit (1) with an electric motor (11) which is arranged in a housing (12), wherein the motor unit (1) comprises a lubricant circuit which lubricates and cools the electric motor (11), wherein- the electric motor (11) comprises a stator (111) and a rotor (112) which is rotatably mounted in the stator (111) which is rigidly connected to the housing (12), wherein a rotor gap (RS) is located between the stator (111) and the rotor (112), wherein the stator (111) is at least partially surrounded by a stator housing (121) which is arranged within the housing (12), wherein the stator housing (121) is at least partially filled with lubricant and belongs to the lubricant circuit,- at least one lubricant pump (13) which is fluidically connected to the stator housing (121) and receives lubricant from the stator housing (121), wherein the lubricant pump (13) has at least one has an outlet for lubricant,which is fluidly connected to the stator (111) and the rotor (112), wherein the lubricant pump (13) delivers lubricant to the electric motor (11) via the outlet, characterized in that a flow generation unit (15) is provided, which sucks air from the housing (12) and blows it into the rotor gap (RS) in order to remove lubricant from the rotor gap (RS) in order to reduce the internal friction in the electric motor (11), wherein the rotor (112) forms a pump of the flow generation unit (14) and, during its rotation, delivers air into the rotor gap (RS) or to the rotor gap (RS), wherein the flow generation unit (15) comprises an oil separator (151) which is arranged in front of the rotor (112) in the direction of flow of the air through the flow generation unit (15),wherein the oil separator (151) separates lubricant contained in the air in the housing (12) and passes air with reduced lubricant content or lubricant-free air to the rotor (112) acting as a pump.

The utility model relates to a composite cover plate used for an automobile inverter, the composite cover plate comprises a lower layer aluminum cover plate, a viscoelastic fiber high polymer layer and an upper layer aluminum cover plate, the composite cover plate comprises the lower layer aluminum cover plate, the viscoelastic fiber high polymer layer and the upper layer aluminum cover plate from bottom to top in sequence, and the lower layer aluminum cover plate is provided with reinforcing ribs. Compared with the prior art, by designing the reinforcing ribs and using the viscoelastic fiber high polymer layer, the damping effect is adjustable, and the impedance performance can be adjusted to reach the maximum at the resonance frequency according to the resonance characteristic of an electric drive system so as to restrain the resonance peak value; the composite cover plate is integrally punched and formed, and compared with a traditional sound insulation foam pasting mode, the composite cover plate is more reliable in structure; the viscoelastic fiber high polymer layer has a high internal friction angle, vibration energy is converted into internal energy of the viscoelastic fiber high polymer layer and dissipated, and the effects of reducing mechanical vibration and lowering noise are achieved; mounting holes are uniformly formed, so that the fixing effect is better, and the stress is more uniform.

The invention discloses a dynamic real-time measurement method and device for the friction coefficient in a rotary shear type granular material, and belongs to the technical field of granular material measurement. The dynamic real-time measurement device for the friction coefficient in the rotary shear type granular material comprises a rotary shear rheological experiment cavity which is connected to a bottom plate through a mounting bracket; the filler is filled with a to-be-detected granular material; the normal load monitoring unit comprises an upper pressure sensor and a lower pressure sensor which are located on the upper portion and the lower portion of the rotary shear rheological experiment cavity, in-situ real-time measurement of the internal friction coefficient of the granular material in the shear flowing process is achieved, and the technical problem that the internal friction characteristic of the granular material is difficult to measure through a traditional method is solved. A cooperative working mechanism of an axial constraint type dynamic loading platform, an annular medium distribution structure and a rotary shear rheological experiment cavity is innovatively designed, shear flow in the granular material is achieved, and the internal friction coefficient of the granular material is measured.

The present application belongs to the technical field of metal materials, and particularly relates to a method for in-situ measuring MC carbide solid solution and precipitation temperature by internal friction. The present application uses pure iron and pure chromium to prepare Fe-Cr based alloy samples, processes the samples into internal friction samples after solid solution and rolling; in a vacuum environment, the samples are heated to a preset target temperature covering the expected solid solution characteristic temperature range of MC carbide at a constant rate and are kept at the temperature, then are cooled at the same rate, the internal friction value and modulus are continuously measured, and a first and second in-situ internal friction temperature spectrum is drawn; the frequency dispersion characteristics of grain boundary relaxation peak, the internal friction value mutation and the modulus change in the two temperature spectra are compared to determine the solid solution temperature and precipitation temperature of MC carbide. The method has high sensitivity and simple operation, and is suitable for in-situ characterization of grain boundary precipitates in low carbon content Fe-Cr based alloys.

The invention belongs to the technical field of heat conduction materials, and discloses a high-heat-conductivity liquid metal thermal interface composite material and a preparation method thereof.The composite material comprises, by weight, 60-90 parts of gallium, 10-25 parts of indium, 0-20 parts of tin, 1-3 parts of nickel-coated carbon and 0.01-1 part of silicon carbide; the nickel-coated carbon and the silicon carbide are compounded into the liquid metal gallium indium tin, so that the high-thermal-conductivity liquid metal thermal interface composite material can be obtained; wherein the nickel-coated carbon is added, so that the heat-conducting property of the gallium-indium-tin liquid metal can be remarkably improved, because on one hand, a nickel layer is used as a thermal bridge for connecting a carbon material and the liquid metal, the interface thermal resistance can be reduced, the wettability of nickel and gallium-indium-tin is good, and on the other hand, the viscosity of gallium-indium-tin can be improved to a certain extent; therefore, random flowing of the liquid metal is inhibited; and silicon carbide does not react with gallium indium tin at normal temperature, so that the internal friction resistance of the liquid metal can be increased, and the silicon carbide can be embedded into the interface of the liquid metal and the substrate, thereby improving the affinity of the material.

The invention relates to a tunnel grouting reinforcement test device and test method suitable for stratified rock mass, the device comprises the stratified rock mass formed by mutually laminated rock slices, the stratified rock mass is inserted into a mounting groove of a rock mass mounting frame, the rock mass mounting frame is placed in a grouting model device, and the grouting model device is connected with the stratified rock mass. The grouting model device is matched with a water injection device, a grouting device, a ground stress loading device and a standard test piece processing device; the ground stress loading device comprises a press for applying pressure to the movable side surface of the box body; the grouting model device comprises a box body formed by hermetically connecting steel plates; the water injection device comprises a height-adjustable water tank. The layered rock mass is mounted through the rock mass mounting frame, and the grouting reinforcement effects of the layered rock mass with different grouting pressures, different joint cohesion and internal friction angles and different joint crossing angles under the combined action of different water pressures and different ground stress environments are simulated and obtained in the grouting model device.

The application relates to a drainage asphalt mixture grading design method based on a single particle size main skeleton concept, which comprises the following steps: selecting raw materials; adding 6mm, 8mm and 11mm screen meshes to finely divide coarse aggregate particle size subintervals; designing coarse aggregate grading, selecting single particle size coarse aggregates with different particle size subinterval proportions to construct a coarse aggregate main skeleton structure; proposing a particle size distribution index, calculating the particle size distribution index corresponding to the single particle size coarse aggregates with different particle size subinterval proportions; designing fine aggregate grading; adopting a coarse aggregate void filling method to determine asphalt content and coarse and fine aggregate ratios; forming test pieces to conduct mechanical property verification tests and drainage performance evaluation tests; and taking the particle size distribution index value to guide coarse aggregate grading design. The coarse aggregate main skeleton structure has good embedding and extruding capacity and internal friction resistance, the mixture prepared by optimizing grading has the characteristics of good skid resistance and strong drainage performance, and the rain environment high-speed driving safety can be significantly improved.

The utility model relates to the technical field of embedded scraper conveyors, in particular to a vertical embedded scraper conveyor, which is characterized in that the other end of a middle section of an inclined section is fixedly connected with a bent section, one end of the bent section is fixedly connected with a horizontal feeding section, and a plurality of partition plates are arranged among the middle section of the inclined section, the bent section and the horizontal feeding section; a scraper chain is connected between the head part and the tail part; the scraper chain comprises a plurality of chain rods, the chain rods are connected through pin shafts, the bottom end of each pin shaft is connected with a check ring, the two sides of each chain rod are fixedly connected with scrapers, and each scraper is fixedly connected with a side baffle. The two side baffles are symmetrically arranged on the scrapers of the scraper chain, so that materials can be effectively prevented from sliding downwards from the gaps between the scrapers and the shell, transverse side pressure and internal friction force between the materials are guaranteed, the materials form stable material flow in the shell of the inclined section, and the material conveying capacity is guaranteed.

The utility model discloses a kind of viscous damping wall devices for bridge, belong to damping equipment technical field, comprising: movable member is movably inserted in damping wall, damping cavity is provided in the damping wall, damping liquid is provided in the damping cavity, the movable member sliding connection with damping cavity can be with damping liquid and shear motion occurs, the movable member includes the fixed connection of fixed part with bridge superstructure, the fixed part bottom end sliding connection has the plugboard connecting piece that can be along bridge transverse sliding, plugboard connecting piece is fixedly connected with plugboard, the plugboard sliding connection is in damping cavity.The utility model is converted into heat energy dissipation by the internal friction effect between fluid molecules, and the mechanical vibration energy of structure is continuously converted into heat energy dissipation, to effectively reduce the dynamic response of structure.

The present invention relates to a method for calculating the anti-uplift stability coefficient taking into account the shear strength of the soil above the caisson blade foot, and the method comprises the following steps: (1) determining calculation parameters, which mainly include the thickness, density, internal friction angle, cohesion, ground overload, soil plug height in the well, and geometric dimensions of the caisson; (2) determining the type of the caisson according to the width and sinking depth of the caisson; (3) according to the determined different caisson types, substituting the calculation parameters into a calculation expression to calculate the anti-uplift stability coefficient of the caisson structure; the method for calculating the anti-uplift stability coefficient taking into account the shear strength of the soil above the caisson blade foot proposed by the present invention can quickly and accurately analyze the anti-uplift stability of the caisson in actual engineering, and provide theoretical support for design and construction.

This invention relates to a design method for reinforcing rock mass structures with small-diameter piles under post-load conditions in the field of slope protection. The method first obtains the inclination angle θ of the outward-dipping structural surface, the internal friction angle and cohesion c, the sliding mass weight γ, the sliding mass height H, the stress ratio n between the pile and the rock mass at the structural surface, the vertical load q applied to the upper part of the sliding mass after the construction of a single deeply embedded small-diameter anti-slide pile, the sliding mass width b, and the horizontal extension length l. Then, using these parameters, it calculates the initial axial force of the deeply embedded small-diameter anti-slide pile before sliding, the deflection angle of the deeply embedded small-diameter anti-slide pile when the anti-slide force is at its maximum, the minimum compressive stiffness of the small-diameter anti-slide pile, and the axial force and anchorage length of the deeply embedded small-diameter anti-slide pile caused by compression after minor deflection deformation at the structural surface. This invention saves resources compared to empirical design methods.