177 results about "Internal friction" patented technology

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 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 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 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 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.

The present application belongs to the technical field of highland tunnel construction, in particular to a tunnel side and upward slope collapse treatment method, the treatment method comprises S5, parameter inversion and model calibration: comparing the displacement data monitored in step S2 with the predicted value of the model in step S1, when the deviation exceeds the preset threshold, the slope geometric model is kept unchanged, the geomechanical parameters in the model are systematically inverted and adjusted by using the iterative algorithm, the stability state calculated by the three-dimensional wedge method is matched with the actual state of the slope reflected by the monitoring data, so as to calibrate the model, and the geomechanical parameters at least include the effective cohesion and effective internal friction angle of the sliding surface. The tunnel side and upward slope collapse treatment method accurately identifies the geometric shape and size of the potential unstable wedge body from the beginning through three-dimensional geological modeling and stereographic projection analysis, so that the treatment measures are more targeted, and blindness is avoided.

The invention discloses an efficient double-spindle boring and milling machine, which relates to the technical field of boring and milling machine tools, and comprises a spindle machine tool, mounting frames which are symmetrically mounted on the spindle machine tool and have a lifting function, driving components and water tanks which are arranged in the mounting frames, and external spraying components which are mounted on the outer walls of the mounting frames and are communicated with the water tanks, the heat dissipation main shaft is rotationally arranged on the outer wall of the mounting frame and can be opened and closed in a self-adaptive and staggered mode based on heat of the friction surface, the tool bit is arranged in the heat dissipation main shaft and drains water from inside to outside to cool the friction surface, and a water injection cavity for cooling water to enter is formed in the tool bit. According to the invention, heat dissipation of the internal friction surfaces of the main shaft and the tool bit is realized, the phenomenon of tool bit deformation caused by thermal wear of the main shaft under long-term operation is reduced, and the problem that the tool bit is damaged due to relatively large friction between the interiors of the main shaft is solved. And an existing external spraying mode obviously cannot achieve an effective heat dissipation effect on the part where telescopic friction is generated.

The invention relates to the technical field of precision manufacturing of automobile parts, and discloses a flexible machining process for a shaft head of an automobile driving system, which comprises the following steps: firstly, immersing the shaft head to be machined into a liquid low-melting-point alloy, and forming full-surface profiling coating and holding after cooling and phase change; then, in the rough machining stage, the medium temperature is reduced and maintained in a low-temperature high-rigidity interval, and a high-rigidity support obtained after medium hardening is used for resisting large cutting force; in the finish machining stage, the medium temperature is actively increased to a near-melting-point high-damping interval, and high-frequency flutter energy is effectively dissipated by utilizing the friction characteristic in crystal boundaries in cooperation with ultrasonic vibration cutting; and finally, melting an interface layer by utilizing a high-frequency induction skin effect to realize rapid lossless unloading. The rigidity and damping characteristics of a medium are dynamically regulated and controlled through a thermal-force coupling feedback mechanism, the problems of clamping deformation and machining chatter of a thin-wall hard workpiece are effectively solved, and the geometric dimension precision and the surface quality of a shaft head are improved.

The invention relates to a high-strength and high-damping ZA22 / 6061 layered composite material and a preparation method thereof. The composite material is of a five-layer sandwich structure formed by sequentially and symmetrically overlapping an outer layer, a middle layer, a central layer, a middle layer and an outer layer, in the preparation method, through the solid solution and aging heat treatment process, the optimization requirements of the microstructures of the two alloys can be met at the same time; and meanwhile, an interface layer which consists of fine grains and is proper in thickness is formed in situ at the interlayer interface. The inherent problem that two alloy heat treatment systems are incompatible is successfully solved, the yield strength of the obtained material is larger than or equal to 180 MPa, the tensile strength is larger than or equal to 190 MPa, the ductility is larger than or equal to 20%, and meanwhile the room-temperature internal friction value of the material at the testing frequency of 0.5 Hz is not lower than 0.028.

The present invention discloses a method for determining the constant m in the Hoek-Brown criterion based on digital drill parameters. i The cutting force F is obtained by using the Hoek-Brown criterion and the relationship between the digital drill parameters. t With thrust F n The relationship curve of the drill bit rake angle α and the rock contact friction angle θ between the drill bit cutting surface and the end face are calculated; the friction angle between the compression zone and the intact rock #imgabs0# and the internal friction angle of the rock #imgabs1# are calculated to draw the cutting force F t About Thrust F n The relationship curve is obtained, the curve intercept b is obtained, and the constant m in the Hoek-Brown criterion is calculated. i ; Substitute θ and #imgabs2# intercept b into the equation of rock cohesion c to calculate cohesion c, and then calculate the rock uniaxial compressive strength UCS; Substitute the calculated constant m i The uniaxial compressive strength UCS is substituted into the H-B criterion to calculate the triaxial compressive strength TCS of the rock. i The accuracy, scientificity and simplicity of the method cannot be guaranteed.

The application discloses a rock stratum horizontal stress measuring method based on a digital drilling technology, and steps of the method comprise the following steps: step 1, a rock digital drilling test is carried out by using a digital drilling device, a relationship between a cutting stress and a feed force is obtained, and then a contact friction angle θ between a cutting surface of a diamond blade and a compression crushing zone is calculated; step 2, the contact friction angle θ obtained in step 1 is used to solve an internal friction angle φ of the rock; and step 3, α, θ, φ', φ obtained in steps 1 and 2 and a rock cohesion c measured are used to solve a confining pressure P of surrounding rock f The method has the advantages of low cost, simple calculation and high precision.

The present invention discloses a damping rubber composition for rail fasteners and its preparation method. The damping rubber composition is characterized by comprising the following raw materials, measured by weight: 100 parts of composite rubber, 25-35 parts of damping particles, 15-20 parts of sheet structure filler, 5-10 parts of plasticizer, 5-10 parts of tackifier, 3-5 parts of high-temperature resistant fiber, 2-4 parts of vulcanizer, 3-5 parts of activator, 2-2.5 parts of accelerator, and 1-3 parts of antioxidant. The composite rubber is a composite of EPDM rubber, 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 the rubber system, enhancing the mobility of the rubber molecular chains, generating significant internal friction to dissipate energy and induce hysteretic deformation. The elastic pad used in rail fasteners exhibits excellent damping performance, aging resistance, and load impact fatigue resistance.

The present invention provides a shield tunnel segment structure deformation adjustment support device and method, which belongs to the field of tunnel maintenance technology and is used for shield tunnel segment deformation adjustment and repair. The device includes a mobile carrier and a support ring. The mobile carrier carries the support ring to move in the tunnel. The support ring includes at least one group. The axial direction of the support ring is consistent with the axial direction of the tunnel. The outer ring direction of the support ring faces the inner ring surface of the tunnel. The inner ring side of the support ring is connected to the mobile carrier. The outer ring side of the support ring is provided with a support structure. The support structure includes a support plate and an expansion structure provided between the support plate and the support ring. When the expansion structure expands, the support plate moves away from the support ring and approaches the inner ring surface of the tunnel. This method is combined with the device to first inject bentonite slurry before the formal grouting adjustment to reduce the internal friction angle of the sand behind the segment, improve fluidity, create favorable conditions for subsequent grouting adjustment, improve adjustment efficiency and accuracy, simplify the construction process, and shorten the construction period.

The application discloses a kind of based on deformation monitoring data's slope instability evaluation method, it is related to slope engineering monitoring data analysis field, method is: obtaining the related data such as topography, stratum, foundation monitoring point in the range around slope;According to the distribution of deformation foundation monitoring point and deformation fitting potential sliding surface;Establish three-dimensional finite element model of slope, and determine the cohesion and internal friction angle of potential sliding surface by inversion;The inversion cohesion and internal friction angle of sliding surface are calculated by strength reduction method, and the safety factor of slope is determined;According to the horizontal displacement direction of foundation monitoring point and potential unstable slope body, the sliding direction of slope is determined;Finally, the slope, potential unstable slope body and its sliding direction are displayed through visual platform, and the volume of potential unstable slope body and the safety factor of slope are displayed by text.The application determines the three-dimensional sliding surface of slope by surface fitting, and then calculates the safety factor of slope by parameter inversion and strength reduction method, realizes the early warning description of slope instability form including instability volume, direction and other characteristics.

The application discloses a method and device for determining an anti-overturning coefficient of a pit-in-pit double-row-pile supporting structure, and relates to the technical field of foundation pit engineering. The method comprises the following steps: determining a trapezoidal cross-section earth covering rupture angle and an earth covering rupture surface of a trapezoidal cross-section earth covering between a pit-in-pit structure and a double-row-pile supporting structure according to an internal friction angle of soil; determining an anti-sliding force of soil above the earth covering rupture surface according to the size of the trapezoidal cross-section earth covering between the pit-in-pit structure and the double-row-pile supporting structure, the trapezoidal cross-section earth covering rupture angle and the shear strength of the soil layer; and determining the anti-overturning coefficient according to the anti-sliding force of the soil above the earth covering rupture surface, the earth pressure outside and inside the foundation pit, the distance between the anti-sliding force action point and the bottom of the double-row-pile supporting structure and the self-weight of the double-row-pile and the soil between the piles. The method solves the problem that the embedded depth of the supporting structure is generally designed according to experience and is too conservative in the prior art, and the embedded depth of the supporting structure is too deep, which greatly increases the construction cost.

A testing device for simulating cohesive force of a tunnel passing through a layered rock mass comprises the layered rock mass formed by mutually stacked rock slices, the layered 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 matched with a water injection device, a grouting device and a grouting reinforcement effect device; 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 grouting device comprises a grouting steel pipe drilled into the stratified rock mass, and grouting openings arrayed in the axial direction are formed in the grouting steel pipe in the radial direction. The stratified rock mass is installed through the rock mass installation frame, and the cohesive force and the internal friction angle of the stratified rock mass after grouting under the real water pressure environment are simulated and obtained in the grouting model device.