64 results about "Stress redistribution" patented technology

The invention relates to a method for extracting coal bed methane through down-hole bedding long borehole consecutive cave building and a hydraulic mechanical drill with the diameter changed and enlarged while drilling. A coal bed bedding long borehole is combined with a cave building technology, and the permeability of low-permeable coal reservoirs and the coal bed borehole extraction capacity are improved. A hole is opened at 1/3 coal thickness or 1.5m upwards away from the coal heading floor on the extracting drill site coal wall of an underground coal mine along with the coal bed, the hydraulic mechanical drill with the diameter changed and enlarged while drilling performs cave building on the borehole from inside to outside successively after the borehole reaches the preset depth, and the cave diameters and distances can be calculated through formulas. Coal bed stresses around the cave are released and coal bed prior cracks are widened and lengthened after the caves are completed, tensional and shear failures occur to the coal bed, novel cracks are produced, and accordingly, the coal bed crack connectivity is increased, the permeability is improved, the coal bed methane can be depressurized and desorbed rapidly, the coal bed methane extracting efficiency is improved dramatically, and the coal bed methane extracting time is shortened.

The invention provides a variable cross-section beam damage identification method based on node curvature and wavelet analysis. The method is based on the assumption that structure microdamage has a little effect on stress redistribution of a variable cross-section beam. At first, displacement signals generated when concentrated loads pass through a damaged variable cross-section beam at a constant speed are measured, node curvature matrixes generated before and after the variable cross-section beam is damaged are calculated based on an undamaged single-scale finite element model, damage location identification is achieved, the structure damage degree is precisely calculated on the basis of a space-time multi-scale model, and finally the damage condition of the variable cross-section beam is obtained.

A technique for maintaining-designs tolerances and reducing stress during welding of closures on nuclear waste containers.

The invention provides a preparation method of a silicon-based lithium ion battery negative electrode material. The method mainly comprises the steps of designing a nitrogen-doped graphene-coated silicon sphere three-dimensional network of which defect induced stress is arranged again; preparing spherical nanometer silicon by a thermal plasma method; preparing a nanometer silicon template by a mechanical method; and preparing the nitrogen-doped graphene-coated silicon-based lithium ion battery negative electrode material by the nanometer silicon template and by a chemical vapor deposition method. A stress concentration principle in elastic mechanics is applied to design of the material, kilometer-scale nanometer silicon powder is prepared by the thermal plasma technology, nitrogen-doped graphene-coated silicon is prepared by the chemical vapor deposition method, and industrial production on a large scale is achieved; the stress concentration principle is introduced, the nitrogen-dopedgraphene-coated silicon is designed and optimized and has more stable structure, and more stable circulation is achieved; and the nanometer silicon prepared by the method has the advantages of smallergrain size, relatively good dispersing performance, relatively high yield and the like.

The invention provides an anchor rod and an anchoring method used for soft rock deformation in a deep roadway. The anchor rod comprises a first anchor rod, a hollow anchor rod, an anchor rope and a second anchor rod; the rear end of the first anchor rod is connected with the front end of the second anchor rod through the hollow anchor rod, and the hollow anchor rod is internally provided with the anchor rope; the two ends of the anchor rope are correspondingly connected with the rear end of the first anchor rod and the front end of the second anchor rod; a barrier plate is mounted on the first anchor rod and is positioned at the rear end of the first anchor rod; the second anchor rod is sleeved with a barrier plate, and the barrier plate is positioned at the front end of the second anchor rod. The anchor rod is simple in structure, convenient to operate and low in cost; during being anchored, the first anchor rod is anchored by adopting an anchoring cartridge, the second anchor rod is bond by adopting a grouting method, a deformation space of an extendable member is fully reserved in the hollow anchor rod, the bearing capacity of stress redistribution of surrounding rock can be automatically controlled, the hollow anchor rod is deformed when the surrounding rock is deformed, the anchor rope can bear the huge resistance, and prevention and control over roadway deformation are realized.

The invention discloses a method for testing the blasting instability law of a jointed rock slope based on a model test, and the method comprises the following steps: S1, obtaining a slope profile, determining various profile parameters and sizes of the slope, and determining the geometric similarity ratio, time similarity ratio and strength similarity ratio of a slope physical model; and S2, setting a model box special for the jointed rock blasting test, and determining model building blocks. A model box special for a jointed rock blasting test is arranged by building similar materials; the phenomenon that the side slope is subjected to instability damage due to blasting vibration can be visually and accurately presented; stress analysis is carried out on a test result, so the stress distribution of a research object in each stage of damage development and the stress redistribution situation caused by deformation and local damage are obtained, and the stress characteristics of naturalrock mass in engineering can be visually, qualitatively or quantitatively reflected; the equipment operation, installation and debugging are simple and easy to understand, test results can meet engineering requirements, and engineering construction is protected.

The invention belongs to the machine manufacturing and machining technology, and particularly discloses a low-deformation machining method of a large aluminum alloy thin-wall mesh barrel section. Themethod comprises the steps of barrel section cleaning, clamping alignment, deformation laser measurement, rough-milling mesh sinking and finish-milling mesh sinking. The low-deformation machining method of the large aluminum alloy thin-wall mesh barrel section is achieved, deformation in the machining process is reduced, and the product quality is improved. A machining path of achieving machiningfrom the middle of the barrel section to the upper end and the lower end is adopted, on one hand, part machining stress can be reduced, on the other hand, part internal stress can be redistributed more averagely, and machining deformation can be effectively reduced. Compensation methods are adopted for achieving precise machining of the large aluminum alloy thin-wall mesh barrel section, part theoretical appearance deviation is eliminated through the laser compensation method, and part mesh thickness precise machining is achieved through the ultrasonic thickness compensation method.

An interconnection structure and a fabrication method thereof. A first organic low-k material layer, a stress redistribution layer, a second organic low-k dielectric layer are formed in sequence over a substrate, followed by forming an opening in the first organic low-k material layer, the stress redistribution layer, and the second organic low-k dielectric layer. The opening is then filled with a conductive material to form an interconnection structure. The stress redistribution layer has a heat expansion coefficient closer to that of the substrate, while such heat expansion coefficient differs more significantly from those of the first and second organic low-k material layers.

The invention discloses a segmented unloading method for underground chamber static explosion excavation in a rock explosion area. The segmented unloading method for the underground chamber static explosion excavation in the rock explosion area comprises the steps that a dense conical cuthole, a horizontal empty hole, a horizontal auxiliary hole and a horizontal periphery hole with different depths are drilled at the front of the tunnel surface to be used as a first stress relief process, and high ground stress is transferred to the interior of rock mass with different depths; then a static rock cracking agent with cyclic penetration is poured into the conical cuthole, the horizontal auxiliary hole and the horizontal periphery step by step, the excavation rock mass is pushed forward expansion pressure more than 30-80 MPa generated by hydration reaction depend on rock cracking agent itself, local stress near the tunnel surface is relieved step by step under the action, the rock mass tobe crushed is subjected to safe static crushing under the condition of no vibration, no noise, no slungshot and no hazards in the excavation process, and a rock explosion control idea of short footage, multi cycle, weak explosion, less disturbance, control of smooth explosion effect and the like at present is meet. The energy accumulation level of stress redistribution caused by rock mass excavation is removed or reduced, and the surrounding rock strength is weakened and the surrounding rock is not damaged excessively.

The invention discloses a micro-stress shelter pile foundation strengthening method, relating to the bridge pile foundation strengthening technology adopted in underground construction under the pile foundation of an urban bridge. The method comprises the step that micro-stress shelter piles are arranged around the bridge foundation or the pile cap for separating the stratum under the bridge foundation and within the surrounding range of the micro-stress shelter piles from the stratum beyond the surrounding range thereof. During the construction and installation of the micro-stress shelter piles, layered high-pressure grouting is implemented, and the piles are connected into a whole through the high-pressure grouting and due to the spreading the grout, thus forming a separation wall, reducing the stress redistribution effect transmission caused by underground space excavation, avoiding the great reduction of side frictional resistance of the piles, reducing the decrease of pile bearing capacity, simultaneously being capable of preventing the shifting of surrounding soil displacement towards the original pile body, effectively controlling the transverse deformation of bridge foundation and inhibiting the settlement of the original bridge piles caused by underground space excavation, and realizing convenient, fast and high-efficiency construction in restricted space.

The invention relates to a tri-linear shape in-plane bending yielding type energy dissipater and a manufacturing method therefor. The energy dissipater comprises a top plate, energy-consuming steel plates, a bottom plate and a connecting plate, wherein the energy-consuming steel plates are arranged between the top plate and the bottom plate; the connecting plate is arranged on the lower bottom surface of the bottom plate; and each energy-consuming steel plate consists of a plurality of steel columns with tri-linear shapes, which are arranged in a plane. According to the tri-linear shape in-plane bending yielding type energy dissipater, sufficient initial rigidity can be provided when small earthquake acts, and energy input by the earthquake can be consumed when major earthquake acts; the energy-consuming steel plates adopt the tri-linear shapes for transition, so that the stress redistribution is caused, the stress concentration of the in-plane yielding type energy dissipater is effectively improved, the multi-point yielding is realized, and the plastic deformability and low-cycle fatigue performance of the energy dissipater are enhanced. The energy dissipater is wide in application prospect and can be applied to reinforcement and reconstruction of new buildings and existing buildings.

The invention discloses structure construction of an assembly type anti-subsidence well lid product. Through the assembly type anti-subsidence well lid, subsidence and collapse of inspection well foundations can be resisted and eliminated, and the phenomena of cracking and damage of the pavement around the well lid are prevented and reduced. The assembly type anti-subsidence well lid has wide application prospects in the fields of municipal newly-built road engineering and municipal current situation road inspection well reconstruction engineering. Due to the fact that the unique design concept and idea that a solid integral well ring is formed on an inspection well lid support, a reinforcement cage and poured C30 concrete and the stress distribution mode of original inspection well foundations, a well lid support and connected pavement subgrade is structurally changed are adopted for the structure construction of the assembly type anti-subsidence well lid product, when external force acts, through stress redistribution and stress transfer, uneven settlement and collapse are avoided, and the purposes that well lid subsidence and cracking of the pavement around the well lid are prevented are achieved. The structure construction of the assembly type anti-subsidence well lid product is not only suitable for municipal newly-built road engineering but also suitable for municipal current situation road inspection well reconstruction engineering.

The invention discloses a construction track slippage monitoring method, and belongs to the technical field of the construction monitoring. The method comprises the following steps: security monitoring; synchronism monitoring; structure stability monitoring; track smoothness detection and monitoring; slippage speed monitoring; and monitoring early-warning. The stress and the deformation are monitored for at least 48 hours after the slippage, and the monitoring is finished after the stress redistribution is sufficiently accomplished and the structure is stabilized. Through all-directional monitoring and early-warning, the security in the slippage construction process is effectively ensured, and the change conditions of various parameters of the structural component in the slippage process can be effectively, accurately, stably and online reflected in real time, and the method has extensive application prospect.

The invention provides a control method for workpiece machining deformation. Reinforcing ribs conforming to a certain condition can be reserved in the primary rough machining stage, so that the bending rigidity of a workpiece is enhanced, and the machining deformation in the primary rough machining stage can be reduced to a great extent; and a middle workpiece with the reinforcing ribs reserved inthe primary rough machining stage is placed for 72 hours or above, then the stable middle workpiece is obtained, and finally the reinforced ribs reserved in the stable middle workpiece are removed through the secondary cutting; and due to the fact that the internal stress of the workpiece is fully released and material needing secondary cutting is little, large stress redistribution is avoided, so that after the reinforcing ribs are cut off, the finally obtained machined workpiece cannot generate large deformation. According to the method, carrying out secondary cutting machining by adoptingthe reserved reinforcing ribs can effectively improve the bending rigidity of the workpiece, so that the final machining deformation is reduced and the method can be used for guiding the structural design of a thin-wall weak-rigidity part.

The invention discloses a mining fault activation tendency discrimination method based on differential stress, and the method comprises the following steps: building a standard two-dimensional fault activation analysis geomechanical model, and analyzing the relation among the normal stress, shear stress, maximum principal stress and minimum principal stress of a fault surface according to the built model; establishing the relationship between the fault activation tendency and the fault surface normal stress, shear stress and fault surface friction strength; constructing a fault activation tendency state function expressed by differential stress; establishing a fault activation tendency discrimination criterion based on a state function; analyzing the activation tendency of the mining faultaccording to the surrounding rock stress redistribution rule under mining disturbance, and analyzing the activation stability of the mining fault. According to the mining fault activation tendency discrimination method based on the differential stress, the influences of fault characters, the ground stress state of the regional environment, the mining stress and the like are considered, and the mining fault stability analysis and evaluation method is more comprehensive and scientific.

The invention relates to a steel and concrete combined structure, and discloses a microwave shrinkage type connection structure of a combined structure and a construction technology. The microwave shrinkage type connection structure comprises a wave-shaped steel web plate (1), a flange plate (2) with micro strain waves (21) and concrete (4), wherein one surface of the flange plate (2) is welded to the wave-shaped steel web plate (1), and the other surface of the flange plate (2) is combined with concrete (4); the roughness of the flange plate (2) is 50-500 micron. The construction technology comprises the steps as follows: A, pressing the micro strain waves (21) of the flange plate (2); B, welding the flange plate (2) to the wave-shaped steel web plate (1); C, performing concrete construction; D, performing concrete curing. According to the invention, since the micro strain waves are arranged on the flange plate, the flange plate and the concrete can be in coordinated change and shrinkage, so that shrinkage cracks of the concrete and stress redistribution of the combined structure are reduced.

The invention relates to a preparation method of an antiskid abrasion-resistant rubber sole material, belonging to the technical field of rubber materials. The preparation method comprises the following steps: by using desulfurized gypsum as a raw material, carrying out screening, grinding, acid treatment, floatation and ball milling treatment, and preparing gypsum whiskers under the action of a mixed nucleation agent; taking a hard alloy, carrying out surface roughing treatment, and coating a polyisohydrogen acid ether adhesive to obtain pretreated hard alloy particles; sequentially adding rubber, the gypsum whiskers, sulfur and the like into a Banbury mixer and a calender to perform compounding and calendering, thereby obtaining a sizing material; and putting the sizing material into a sole mold, spreading the pretreated hard alloy particles on the upper surface, carrying out press mold vulcanization forming in a vulcanizer, and demolding to obtain the antiskid abrasion-resistant rubber sole material. Under the action of stress, the rubber can skid on the alloy particle surface, so that the stress in the material is redistributed, thereby avoiding the stress concentration, enhancing the outside friction resistance of the rubber, and further enhancing the abrasion resistance of the rubber.

The invention relates to a method for examining water blocking effect of cracked surrounding rocks of tunnels after grouting. The method comprises the following steps: step one, subjecting a sample to circumferential loading so as to form cracks in the sample, and recording the acoustic emission signals during the loading process; step two, subjecting the sample to pressure grouting, and recording the acoustic emission signals during the grouting process; step three, after the slurry cures, subjecting the cured slurry to penetration tests, and recording the seepage flow and seepage pressure of loaded end surface during the experiment process. The method can realistically represent the crack growth characteristics of rocks after rupture, and characteristics of stress redistribution after excavation.

The invention discloses a rock mass elastic-plastic damage-seepage coupling calculation method under a complex disturbance condition. The method comprises the following steps: S1, establishing a rock mass elastic-plastic damage coupling model under complex disturbance; S2, establishing a rock elastic-plastic damage-seepage coupling model under complex disturbance; S3, modifying the elastic-plastic damage model of the rock mass into a probability expression form obeying Weibull distribution; S4, establishing a rock elastic-plastic damage-seepage coupling model considering the time effect; and S5, performing analysis on the rock mass elastic-plastic damage-seepage coupling field considering the time effect under complex disturbance to obtain corresponding safety evaluation data. According to the method, a rock mass damage criterion under the dual effects of disturbance factors and stress redistribution is established, and the rheological characteristics of the rock mass are considered at the same time; and the rock elastic-plastic damage-seepage coupling model considering the time effect under complex disturbance is applied to stability evaluation of actual engineering, and a certain design basis is provided for safety construction of similar engineering.

The invention discloses a multilayer functional gradient vertical shaft wall structure. The shaft wall structure comprises a plurality of coaxial concrete functional layers, wherein the using functions of the functional layers of the whole shaft wall structure are changed in a gradient mode from outside to inside, a functional gradient shaft wall can be composed of an anti-seepage layer, a water pressure resisting layer, an anti-corrosion layer, a fire resisting layer and other functional layers, the water pressure resisting layer is composed of multiple coaxial and equal-thickness structurallayers with the elasticity modulus changed in a gradient mode in the radial direction, the elasticity modulus of the structural layers of the water pressure resisting layer is gradually reduced from outside to inside, the structural layers of the water pressure resisting layer can be in direct contact connection or connected through connecting pieces, and the functional layers are in direct contact connection. The water pressure resisting layer of the functional gradient shaft wall enables stress in the shaft wall to be redistributed by changing the elasticity modulus, the strength of concreteon the outer side of the shaft wall is fully utilized, and the bearing capacity of the shaft wall is fully exerted. The functional layers such as the anti-seepage layer, the water pressure resistinglayer, the anti-corrosion layer and the fire resisting layer of the functional gradient shaft wall are combined for use, the using performance of the shaft wall under the complex geological conditionis improved, and the application range is widened.