31 results about "Natural stress" patented technology

The invention discloses a method for determining the construction sizes of a tunnel and a cavern. The method comprises the following steps of: determining the rock mass natural horizontal stress sigmahav and vertical stress sigmah of a position where a tunnel is positioned, and determining a natural stress ratio coefficient; determining rock mass natural horizontal stress sigmahav and vertical stress sigmah of a position where a tunnel is positioned, and determining a natural stress ratio coefficient mu=sigmahav / sigmah; checking a tunnel construction size envelope line curve chart to obtain the range of a construction size ratio eta; initially determining the vertical semi-axis size n of a construction tunnel; and calculating the horizontal semi-axis size m of the construction tunnel. According to a tunnel / cavern construction size obtained by using the method, a surrounding rock structure can adapt to natural stress gravity distribution variation caused by underground cavern excavation to the maximum extent, the surrounding rock structure is stressed reasonably in a redistributing process, and the self-carrying capability of surrounding rock is positively brought into play. The method is simple, economic and practical; the surrounding rock structure stress characteristic principle basis is embodied, the requirements on the quality of design and construction personnel are lowered greatly, and excavation support costs on the tunnels and caverns can be greatly lowered.

The invention relates to a device capable of measuring limited filling pressure and displacement produced when a retaining wall rotates around a wall bottom. The device comprises a limited filling model box system, a system of the retaining wall rotating around the wall bottom and a PIV testing system. The testing device can truly simulate the natural stress state existing when the limited filling retaining wall rotates around the wall bottom, in other words, the soil stress state is the same as the soil state in the actual engineering. According to the testing device, high-precision soil pressure sensors are arranged on the retaining wall at equal height intervals, so that the limited filling soil pressure can be measured in real time; and a high-precision camera is arranged in right front of the model box, and meanwhile the PIV technology is adopted, so that a soil displacement image produced in the whole process when the retaining wall rotates around the wall bottom is measured in real time. According to the model testing device, operation is convenient, and related instruments are simple in structure and easy to master.

The invention relates to a device capable of measuring limited filling pressure and displacement change in the translation process of a retaining wall in real time. The device comprises a limited filling model case system, a retaining wall translation system and a particle image velocimetry (PIV) testing system. According to a testing device, the natural stress state of the limited filling retaining wall in the translation process can be simulated really, that is to say, the stress state of the soil body in the test process is the same as that in practical engineering; high-precision soil pressure sensors are arranged on the retaining wall at equal height intervals, so that soil pressure of limited filling can be measured in real time; a high-precision camera is arranged right ahead a model case, and soil body displacement images in the whole translation process of the retaining wall can be measured in real time through the utilization of a PIV technology at the same time. According to the device, the model testing device is convenient to operate, and the related instruments are simple in structure and easy to control.

Refracted energy travel time can help to derive anisotropic parameters in a target layer. These anisotropic parameters allow us to both explore for new reservoirs and to understand stress and fracturing in existing reservoirs. This information can be used to i) detect oil reservoirs, ii) spot naturally fractured, hence high production zones, iii) detect dominant natural stress directions, iv) better place horizontal wells to optimize production, v) monitoring man made fractures or induced directional stress changes. The method is demonstrated using synthetic and real data.

The invention discloses a bridge pier VSR (vibration stress relief) method for a steel structural bridge and relates to the technical field of stress relief treatment of steel structure parts. A bridge pier of the steel structural bridge is a high-rigidity and heavy large structural part, and stress relief treatment is difficult to perform with existing thermal stress relief, natural stress relief, ultrasonic impact stress relief and VSR methods. According to the method, the bridge pier is supported by a support pad, multiple sets of VSR equipment are used, multiple vibration exciters are adjacently fixed on a lower frame beam of the bridge pier, multiple vibration testers are adjacently fixed on an upper frame beam of the bridge pier, then, multiple vibration exciters are controlled by use of multiple controllers, co-frequency sub-resonance vibration is performed on multiple resonance peaks of the bridge pier for several hours, the purpose of effectively relieving the residual stressis achieved, the average relief rate of the residual stress reaches 43%, the problem of difficulty in relieving the residual stress of the bridge pier is solved, and the method can be applied to steelstructural bridges.

The invention relates to a novel method for preparing an artificial stress corrosion crack by utilizing a photoetching and powder metallurgy technology. The novel method for preparing the artificial stress corrosion crack by utilizing the photoetching and powder metallurgy technology comprises the steps of firstly acquiring geometric shapes at different depth parts of a true stress corrosion crack, adopting the photoetching technology for processing stress corrosion crack shape objects at the different crack depth parts, and adhering the stress corrosion crack shape objects so as to form a whole stress corrosion crack shape object; then putting the stress corrosion crack shape object and prepared stainless steel metal powder, dispersing agent, distilled water and an adhesive mixture into acontainer, and forming a compact specimen; and finally placing the compact specimen in a vacuum furnace, degumming and sintering, machining the sintered specimen, and obtaining an artificial stress corrosion crack specimen with the final target size and surface cracks. The specimen prepared through the method provided by the invention can artificially copy a natural stress corrosion crack in an actual structure, has the advantages of complicated crack shape and capabilities of being known and being prepared on a large scale, and can be widely applied to a detectability certification system ofa stress corrosion crack quantitative nondestructive detecting method.

Refracted energy travel time can help to derive anisotropic parameters in a target layer. These anisotropic parameters allow us to both explore for new reservoirs and to understand stress and fracturing in existing reservoirs. This information can be used to i) detect oil reservoirs, ii) spot naturally fractured, hence high production zones, iii) detect dominant natural stress directions, iv) better place horizontal wells to optimize production, v) monitoring man made fractures or induced directional stress changes. The method is demonstrated using synthetic and real data.

The invention discloses a new preparation method for an artificial stress corrosion crack accordant with a true crack shape. In the method, firstly an industrial CT is used for scanning and imaging atrue stress corrosion crack test block, to acquire a stress corrosion crack shape graph; 3D print is directly performed to acquire an artificial stress corrosion crack accordant with the shape of thetrue stress corrosion crack by using the stress corrosion crack shape graph in combination with a 3D printing technology. A test piece prepared by using the method provided by the invention can repeatedly processes and prepares natural stress corrosion cracks in an actual structure, and has the advantages that the shapes of the cracks are accordant with that of the true crack, and the cracks can be prepared in large quantity; and method can be widely applied to a detectability certification system of a stress corrosion crack eddy current quantitative nondestructive detection method.

The invention discloses a shear test device and a shear test method in an in-situ soil body pore. The test device is lowered to a test point by utilizing a drilling machine to bore, normal stress is provided by applying air pressure to facilitate the expansion of an airbag so as to drive a shear barrel to be expanded, a shear cutter on the periphery of the shear barrel can be inserted into a soil body so as to solidify the soil body, a steel rod is driven by applying hydraulic pressure through a gear to lift so as to drive the shear cutter to cut the soil body, the soil body is cut and destructed, and finally a shear index of the soil body can be calculated according to a coulombs law. The test method comprises the steps of boring, assembling the test device, lowering the device, solidifying, cutting and processing data. The invention also provides a shear test device in the in-situ soil body pore. According to the technical scheme, the strength index of the soil body can be determined under a natural stress state. The shear test device and the shear test method have advantages of low price, simplicity in operation, short test time and strong applicability.

The invention discloses a bridge pier VSR (vibration stress relief) method for a steel structural bridge and relates to the technical field of stress relief treatment of steel structure parts. A bridge pier of the steel structural bridge is a high-rigidity and heavy large structural part, and stress relief treatment is difficult to perform with existing thermal stress relief, natural stress relief, ultrasonic impact stress relief and VSR methods. According to the method, the bridge pier is supported by a support pad, multiple sets of VSR equipment are used, multiple vibration exciters are adjacently fixed on a lower frame beam of the bridge pier, multiple vibration testers are adjacently fixed on an upper frame beam of the bridge pier, then, multiple vibration exciters are controlled by use of multiple controllers, co-frequency sub-resonance vibration is performed on multiple resonance peaks of the bridge pier for several hours, the purpose of effectively relieving the residual stressis achieved, the average relief rate of the residual stress reaches 43%, the problem of difficulty in relieving the residual stress of the bridge pier is solved, and the method can be applied to steelstructural bridges.

The invention relates to the technical field of food additives, in particular to a modifier for glutinous rice products. The modifier comprises the following components in percentage by weight: 65 to 75 percent of trehalose, 5 to 10 percent of sucrose ester, 10 to 20 percent of glycerol monostearate, 5 to 10 percent of konjac flour and 1 to 10 percent of polyphosphate double salt. The modifier ischaracterized in that: through reasonable compatibility of a natural emulsifying agent, a natural stress-resistant preservative and functional components, which are synergic, the glutinous rice products have appropriate mouthfeel and flavor, stable quality, and the shelf life of six months or above; the problem that the glutinous rice products are difficult to digest is solved; and the products have certain health-care function.

The invention relates to a thermal / vibratory combined stress homogenizing device which is composed of a vibratory stress relief system (A) and a thermal stress relief system (B), wherein most of the vibratory stress relief system (A) is contained in an outer cover (13) of the thermal stress relief system (B); an internal bladder (12) of the thermal stress relief system (B) is covered on a vibratory platform (4) of the vibratory stress relief system (A); the bottom of the internal bladder (12) is in contact with the ground; and the relative positions of the internal bladder (12) and the vibratory platform (4) are positioned by regulating three internal walls among four side walls until the distances between the three internal walls and the contour of the vibratory platform (4) are equal. Traditional natural stress relief prolongs the production cycle of spare parts and also influences the quality of the product. According to the invention, the production efficiency can be effectively improved, the research and development cycle of the product can be shortened, and the quality of the product can be enhanced. Thus, the thermal / vibratory combined stress homogenizing device plays a very important role in actual industrial production.

The invention relates to a device capable of measuring limited filling pressure and displacement produced when a retaining wall rotates around a wall bottom. The device comprises a limited filling model box system, a system of the retaining wall rotating around the wall bottom and a PIV testing system. The testing device can truly simulate the natural stress state existing when the limited filling retaining wall rotates around the wall bottom, in other words, the soil stress state is the same as the soil state in the actual engineering. According to the testing device, high-precision soil pressure sensors are arranged on the retaining wall at equal height intervals, so that the limited filling soil pressure can be measured in real time; and a high-precision camera is arranged in right front of the model box, and meanwhile the PIV technology is adopted, so that a soil displacement image produced in the whole process when the retaining wall rotates around the wall bottom is measured in real time. According to the model testing device, operation is convenient, and related instruments are simple in structure and easy to master.

The invention discloses an assembled and detachable type in-situ test device for seepage of a fractured rock mass. The assembled and detachable type in-situ test device consists of a first fixed sealing device, a second fixed sealing device and a control system, wherein the first fixed sealing device and the second fixed sealing device are respectively and fixedly arranged in the rock mass, are respectively connected with the control system, and are respectively communicated with a fracture. The assembled and detachable type in-situ test device has the advantages that by performing the seepage test on the given fracture in the rock mass under different pressure conditions, the control system, the first fixed sealing device, the second fixed sealing device and the fracture form a closed loop, so as to automatically collect and store data; the structure is simple, and the assembly and detachment are convenient; the whole device is positioned in the original geological environment of the fractured rock mass, the natural structure and natural stress state of the fractured rock mass are maintained, and the hydraulic conduction coefficient of the fracture seepage is accurately obtained.

An apparatus for magnetic resonance imaging of patients with limbs, particularly lower limbs, under natural stress, which apparatus includes a magnet structure having an open or closed annular shape, and a predetermined axial extension, which structure delimits a cavity for receiving at least a part of the patient body, with at least two or three open sides, the open sides providing access to the cavity. The open or closed annular magnet structure being disposed with the axis of the open or closed annular shape oriented with at least one vertical directional component and devices being provided for vertical translation of the magnet structure or the patient relative to the magnet structure.

The invention discloses a breeding method of green super-rice. The method comprises the following steps: (1) taking rice parents for hybridization, to obtain an F1 generation; (2) performing selfing and back-crossing to the F1 generation to obtain a F2 generation and a BC1F1 generation; (3) placing the F2 generation or the BC1F1 generation in a natural stress environment for breeding, and screening according to target characters to obtain target single plant; (4) repeating the steps (2) and (3) until the single plant with stable characters is obtained. According to the method, the conventional breeding method and a multi-factor natural stress environment are combined, rice is not subjected to stress screening of water irrigation, fertilizer application and pesticide spraying environments after being transplanted, high-yield, drought-resistant, low fertilizer-resistant (efficient utilization of the fertilizer) and disease and pest-resistant green super-rice can be obtained through matching the screening of target characters; and the rice material obtained by adopting the breeding method has the characteristics of being high-yield, drought-resistant, low fertilizer-resistant (efficient utilization of the fertilizer) and disease and pest-resistant, and the hereditary character is stable.

The invention relates to a device capable of measuring limited filling pressure and displacement change in the translation process of a retaining wall in real time. The device comprises a limited filling model case system, a retaining wall translation system and a particle image velocimetry (PIV) testing system. According to a testing device, the natural stress state of the limited filling retaining wall in the translation process can be simulated really, that is to say, the stress state of the soil body in the test process is the same as that in practical engineering; high-precision soil pressure sensors are arranged on the retaining wall at equal height intervals, so that soil pressure of limited filling can be measured in real time; a high-precision camera is arranged right ahead a model case, and soil body displacement images in the whole translation process of the retaining wall can be measured in real time through the utilization of a PIV technology at the same time. According to the device, the model testing device is convenient to operate, and the related instruments are simple in structure and easy to control.

The invention discloses a method for determining the construction sizes of a tunnel and a cavern. The method comprises the following steps of: determining the rock mass natural horizontal stress sigmahav and vertical stress sigmah of a position where a tunnel is positioned, and determining a natural stress ratio coefficient; determining rock mass natural horizontal stress sigmahav and vertical stress sigmah of a position where a tunnel is positioned, and determining a natural stress ratio coefficient mu=sigmahav / sigmah; checking a tunnel construction size envelope line curve chart to obtain the range of a construction size ratio eta; initially determining the vertical semi-axis size n of a construction tunnel; and calculating the horizontal semi-axis size m of the construction tunnel. According to a tunnel / cavern construction size obtained by using the method, a surrounding rock structure can adapt to natural stress gravity distribution variation caused by underground cavern excavation to the maximum extent, the surrounding rock structure is stressed reasonably in a redistributing process, and the self-carrying capability of surrounding rock is positively brought into play. The method is simple, economic and practical; the surrounding rock structure stress characteristic principle basis is embodied, the requirements on the quality of design and construction personnel are lowered greatly, and excavation support costs on the tunnels and caverns can be greatly lowered.