40 results about "Seismic zone" patented technology

The embodiment of the invention discloses a landslide disaster evolution analysis method and system based on a coupling model, and the method comprises the steps: carrying out the multi-source data integration of geological structure monitoring data, landform distribution data and hydrological environment monitoring data of a target seismic region, and generating a comprehensive monitoring data set; based on the data set, establishing an interaction association relationship of the target equation set, and constructing a geology-landform-hydrology coupling model; performing dynamic simulation and quantitative evaluation on the instability probability and the landslide scale of the potential landslide mass by using the coupling model according to a preset scene parameter combination, and generating an image-text annotation quantitative evaluation report; and finally, carrying out vulnerability analysis and risk assessment on the disaster-bearing body based on the report, generating a comprehensive guidance report containing a disaster-bearing body vulnerability spatial distribution diagram, landslide risk prevention and control measure suggestions and a regional space planning optimization scheme, and providing a scientific basis for landslide disaster prevention and control and regional planning.

This invention provides a method and system for detecting exposed rebar in tunnel lining in strong earthquake zones, comprising: constructing a standard rebar structure for the tunnel in a strong earthquake zone according to tunnel construction drawings; determining several rebar sampling locations in the tunnel in a strong earthquake zone; performing image sampling on each of the rebar sampling locations to obtain several regional rebar features in the tunnel in a strong earthquake zone; reconstructing the constructed rebar structure in the tunnel in a strong earthquake zone based on the regional rebar features; identifying structural differences between the constructed rebar structure and the standard rebar structure; determining the exposed rebar defect features of the corresponding rebar sampling locations based on the difference attributes corresponding to each of the structural difference information; generating and displaying an exposed rebar defect report for the tunnel in a strong earthquake zone. This method utilizes the convenience and accuracy of image recognition to improve the quality of exposed rebar identification work and effectively improves worker efficiency.

The invention relates to the field of bridge damping, in particular to a near-fault bridge anti-seismic toughness improving device and a test method thereof.The bridge comprises T-beams, a cover beam, a diaphragm plate between every two adjacent T-beams and an ECC column located between the two T-beams; two pairs of SMA disc spring devices are arranged on the ECC column body, one pair of SMA disc spring devices are arranged towards the T beam, and the other pair of SMA disc spring devices are arranged towards the transverse partition plate; the SMA disc spring devices are used for enabling the T beams to recover to the initial positions through the recovery characteristic of the SMA disc spring devices after relative displacement of the bridge in the transverse bridge direction occurs, and the ECC column is arranged between the two T beams of the bridge, so that the T beams can be recovered to the initial positions. The limit tensile strain of the ECC (fiber cement-based composite material) material can reach more than 200 times that of the traditional concrete, and the ECC material is accompanied by the multi-crack cracking phenomenon of fine cracks, so that the strain hardening characteristic of a similar metal material under the tensile effect is formed, and the structural deformation caused by earthquakes can be effectively dealt with.

The present invention relates to the field of data visualization technology, and in particular to a method and system for rapid visualization of earthquake emergency information. The method comprises the following steps: acquiring real-time earthquake monitoring data; gridding the population density distribution and key facility locations in the earthquake zone based on the real-time earthquake monitoring data to generate a sensitivity matrix for the earthquake zone; dynamically simulating the seismic wave propagation process based on the real-time earthquake monitoring data and the seismic zone sensitivity matrix to generate wave propagation time series data; identifying epicenter topographic and geomorphological vector data from the real-time earthquake monitoring data, and separately evaluating the topographic relief and geological stability to obtain earthquake topographic relief index data and earthquake geological stability score data. The present invention utilizes data visualization technology to achieve rapid and accurate assessment and visualization of earthquake damage distribution, thereby improving the efficiency of earthquake emergency response and the scientific nature of disaster relief decision-making.

The invention relates to a method for inverting a high-resolution P and S wave velocity ratio time sequence based on seismic wave arrival time. The method comprises the following steps: S1, acquiring longitudinal wave and transverse wave arrival time difference data of a seismic pair; s2, carrying out linear relation fitting on longitudinal wave and transverse wave arrival time difference data, and extracting an average wave velocity ratio of an earthquake pair; s3, constructing an initial wave velocity ratio time sequence according to the earthquake generating moment of the earthquake sequence; s4, constructing a time sequence inversion matrix, and performing inversion solution on the time sequence inversion matrix to obtain a wave velocity ratio time sequence; and S5, judging whether the wave velocity ratio time sequence is stable or not, if the wave velocity ratio time sequence is stable, adding one to the unknown number of the time sequence, returning to S3, and if the wave velocity ratio time sequence is unstable, outputting the inverted wave velocity ratio time sequence. According to the method, the dynamic change rule of the wave velocity ratio of a natural seismic zone or an artificial blasting area can be more accurately revealed.

The current invention deals with a hybrid wood-concrete column, tackling the critical challenges of fire resistance, structural integrity, and environmental sustainability in today's construction. The column comprises three main parts including a wooden central core covered with the intumescent fire-retardant coating, an outer concrete jacket with additives like micro-silica and polypropylene fibers to boost both its thermal resistance and compressive strength, and a layer of insulation to greatly reduce heat transfers between the core and jacket. The hybrid design synergistically distributes tensile and compressive forces, enabling a high load-bearing capacity of at least 1.3 MN while maintaining lightweight properties for dynamic stability in seismic zones. This composite column shows a 63% reduction in heat transfer compared to conventional systems, ensuring prolonged fire resistance. It is ideal for tall buildings, infrastructure that can withstand disasters, modular construction, and projects that need updating, providing a strong, affordable, and eco-friendly answer to modern engineering issues.

The invention provides a fabricated steel structure column base anti-seismic reinforcing device, and relates to the technical field of steel structures, the fabricated steel structure column base anti-seismic reinforcing device comprises a steel column, an upper side column base bottom plate is welded to the bottom end face of the steel column, and a lower side column base bottom plate consistent with the upper side column base bottom plate in structural size is arranged below the upper side column base bottom plate; a double-elastic buffering system is formed through the rubber buffering compensation sleeve and the rubber anti-vibration buffering cushion, the rubber buffering compensation sleeve is in sliding fit with the limiting insertion column, horizontal and vertical vibration energy is absorbed through elastic deformation of the rubber buffering compensation sleeve, and a vibration transmission path is weakened; the rubber anti-seismic cushion further buffers vibration impact force through compression rebound deformation, meanwhile, the vibration amplitude is attenuated by means of the high damping characteristic of rubber materials, the structure resonance risk is effectively reduced, impact caused by medium-high-strength earthquakes can be better resisted, and the service life of the anti-seismic cushion is prolonged. The problems that an existing fabricated steel structure column foot is insufficient in anti-seismic buffering performance, weak in shear resistance and limiting capacity and inconvenient in structural state monitoring are solved.

This invention relates to a lightweight caisson and its construction method suitable for the construction of high-pile foundations for bridges in water. The caisson includes a base plate and side plates installed around the base plate. The base plate is composed of multiple precast blocks, which are connected as a whole by wet-joint concrete pouring. The base plate has multiple inverted arched grooves, each covered by a cover plate. The base plate also has through-holes for steel casings. For each pile foundation construction, a steel casing is inserted into one of these through-holes, and circumferential sealing concrete is poured into the gap between the inner wall of the through-hole and the outer wall of the steel casing. The inverted arched cavity in the base plate of this invention reduces the weight of the base plate without reducing its thickness, thus ensuring sufficient bonding force between the base plate and the steel casing. This effectively enhances the seismic performance of bridges in water in high-intensity seismic zones.

The present invention discloses a seismic support structure for a high slope locking section, comprising a seismic flexible support structure, wherein the seismic flexible support structure comprises a flexible concrete support frame provided on the slope surface and a plurality of seismic anchor rods; the seismic anchor rod comprises a rod body and an anchor head provided at one end of the rod body, an end of the rod body away from the anchor head is provided with a seismic section, and the anchor head comprises a pad movably sleeved on the outer wall of the rod body, a protective shell provided on the pad, a rigid support portion horizontally provided in the protective shell, and a seismic device provided at the connection between the rigid support portion and the rod body. The seismic section in the seismic anchor rod of this technical solution is in elastic contact with the hardened cement slurry poured into the slope through a damping boss, and at the same time, the axial and tangential seismic forces caused by the earthquake are absorbed and buffered by the compression between the first and second curved steel plate strips and the rigid support portion, thereby exerting stable seismic resistance and avoiding situations such as the anchor rod being pulled off and the anchor body being pulled out.

This application provides a method and system for assessing earthquake-induced landslide risk in transportation networks in high-intensity seismic zones, relating to the field of landslide risk assessment technology. The method includes: screening key influencing factors of earthquake-induced landslides; optimizing the construction of positive and negative sample libraries; using a spatial weighted machine learning model to evaluate landslide susceptibility and generate a susceptibility zoning map; extracting parameters of potential landslide source areas based on the high-susceptibility zone identification results; using a parallel particle discrete element method to simulate the entire landslide movement process to obtain hazard parameters; inputting the hazard parameters into a transportation engineering structure vulnerability model to quantitatively calculate the failure probability; and fusing the susceptibility probability and structural vulnerability results to generate a risk zoning map based on road network units. The final results of this application are directly applicable to the operation and maintenance management of transportation infrastructure. The provided risk zoning map can be directly used to guide the optimal allocation of risk control resources, the formulation of emergency plans, and the seismic resilience design of engineering projects, demonstrating clear application value.

The application discloses a method for forming an effective pile diameter vibro-replacement stone pile under an ultra-strong earthquake zone, which comprises the following steps: installing a detection element for detecting a vibroflot deflection parameter on a shock absorber or a guide rod; penetrating a pipeline for supplying water through the vibroflot and extending the pipeline from the bottom end of the vibroflot; controlling the perpendicularity of the vibroflot according to the vibroflot deflection parameter detected by the detection element during the vibroflot construction; when the perpendicularity of the vibroflot reaches a specified perpendicularity range, the vibroflot controls the water flow of the supplied water according to the current stratum compactness to perform a vibroflot hole forming construction; and vibrating the stone filler put into the stone pile to form a vibro-replacement stone pile with an effective pile diameter after the hole forming construction is completed. The method can accelerate the vibroflot construction of the stratum with a depth of more than 50 m and thick overburden according to the stratum condition and the required perpendicularity, and can make the stone pile formed by the vibro-replacement stone filler tightly combined with the soil layer.

This invention belongs to the field of tunnel cavity detection technology, and provides a three-dimensional lidar scanning system for tunnel lining cavities in strong earthquake zones. The system includes: a tunnel contour point cloud data acquisition module for collecting tunnel contour point cloud data; a cooperative positioning data acquisition module for collecting cooperative positioning data; a data fusion module for fusing multi-period tunnel contour point cloud data and cooperative positioning data; a standard tunnel contour model construction module for processing the fused data using radial basis function neural networks and clustering algorithms to establish a standard tunnel contour model; and a lining cavity detection module for identifying and detecting lining cavities based on the standard tunnel contour model and measured tunnel contour point cloud data. This invention enables high-precision and high-efficiency scanning and detection of tunnel lining cavities in strong earthquake zones, improving the accuracy and reliability of detection.

The invention belongs to the technical field of tunnel cavity detection, and provides a tunnel intense seismic zone lining cavity scanning system based on a three-dimensional laser radar, and the system comprises a tunnel contour point cloud data acquisition module which is used for collecting and obtaining tunnel contour point cloud data; the cooperative positioning data acquisition module is used for acquiring cooperative positioning data; the data fusion module is used for carrying out data fusion on the multi-cycle tunnel contour point cloud data and the cooperative positioning data; the standard tunnel contour model building module is used for processing the fusion data by using a radial basis function neural network and a clustering algorithm and building a standard tunnel contour model; and the lining cavity detection module is used for identifying and detecting a lining cavity based on the standard tunnel contour model according to the actually measured tunnel contour point cloud data. According to the invention, high-precision and high-efficiency scanning detection of the tunnel strong seismic zone lining cavity can be realized, and the detection accuracy and reliability are improved.

The utility model relates to a multilayer damping shock insulation device, which comprises a storage plate, a bottom plate and a damping body arranged in the middle, the storage plate is provided with a limiting support column, the bottom plate is provided with a circular slot position for placing the damping body, the damping body comprises at least two layers of annular damping rings, and a spacer ring is arranged between two adjacent layers of annular damping rings. The limiting supporting column is inserted into the annular opening of the middle annular damping ring and abuts against the inner wall of the annular damping ring. External force brought by earthquakes is applied to the middle positions of the damping bodies through the limiting supporting columns, and the external force is buffered and weakened layer by layer from inside to outside through the multi-layer damping body structure; and when the force is transmitted to the next annular damping ring, the buffering effect on the force is gradually increased. According to the damping device, the ideal damping effect can be achieved only through the damping body, the types of damping pieces are simplified, the manufacturing cost is reduced, the damping characteristics of multiple positions in the radial direction of the damping body can be efficiently utilized, and the damping effect is greatly improved.

The invention belongs to the technical field of oil-gas exploration, and particularly relates to a fracture identification method based on optimized sub-band RGB fusion, and the method comprises the steps: S1, carrying out the preprocessing of seismic data; s2, spectrum analysis and frequency range body attribute analysis; and S3, carrying out sub-band RGB fusion. According to the optimized sub-band RGB fusion method, a data enhancement body is decomposed into a low frequency band body, a middle frequency band body and a high frequency band body, the frequency band bodies have more advantages compared with a single frequency body, sensitive attributes are preferably selected for the three frequency band bodies for attribute fusion, and the characterization capacity of different frequency band bodies for fracture is enhanced. On the basis, layer attribute slices are extracted from sensitive attribute fusion bodies corresponding to different frequency band bodies for RGB fusion and illumination display, so that the generality reflecting fractures in low, medium and high frequency band ranges is further highlighted. According to the method, the generality of the seismic band ratio can be effectively highlighted, and compared with a conventional method, the fracture identification precision can be further improved.

The application discloses a frame structure, comprising a prefabricated frame, the prefabricated frame comprising frame columns, frame beams, secondary beams and floors; a post-cast rocking frame for making inter-story shear force distribution more uniform is arranged between adjacent prefabricated frames; the post-cast rocking frame comprises rocking columns, coupling beams, infill walls, hidden beams and cast-in-situ floors; energy dissipation devices for improving the seismic resistance of the frame structure are arranged between the frame columns and the coupling beams; base pads are arranged at the bottom of the prefabricated frame; and energy absorption pads for absorbing energy and mitigating impact are further arranged between the base pads and the rocking columns. The application further discloses a construction method of the frame structure, comprising foundation construction, assembling the prefabricated frame, assembling the rocking frame, assembling the coupling beams and the second floors, and assembling the energy dissipation devices. The prefabricated frame and the post-cast rocking frame are arranged to enhance the seismic toughness of the overall structure, and the energy dissipation devices and the energy absorption pads are arranged inside to further mitigate the impact caused by earthquakes; the whole structure is constructed by using the prefabricated method, which is convenient to operate.

The invention provides a novel bridge anti-seismic device and a construction method thereof, a damping block is arranged in a corresponding earthquake high-incidence area of a bridge, the cross section of the damping block is matched with the cross section of an inner cavity of the bridge in shape, and a plurality of damping pieces are distributed on the periphery of the damping block, so that the damping block is limited on the inner wall of the bridge in the circumferential direction through the damping pieces. The damping device is arranged in the box girder of the bridge, and the damping device is in buffer connection with the bridge, so that the anti-seismic property of the bridge in a seismic zone is effectively improved, and the damage of an earthquake to a bridge structure is reduced.

The application discloses a method for controlling water permeability of a vibro-replacement stone pile, which comprises the following steps: rapidly completing vibro-replacement construction of a stone pile hole; performing hole cleaning treatment on the stone pile hole, and obtaining mud density in the stone pile hole during the hole cleaning treatment by using a mud pump; controlling water flow and air flow according to the mud density obtained by the mud pump, so that the mud density in the stone pile hole meets the requirements; after the hole cleaning treatment is completed, the stone filling is put into the stone pile hole, and the stone filling in the stone pile hole is subjected to vibro-replacement compaction construction by using a vibrator, so as to form a vibro-replacement stone pile with an effective pile diameter. The method ensures that the water permeability in the stone pile hole meets preset requirements, so that the water permeability of an ultra-deep vibro-replacement stone pile formed under an ultra-deep overburden layer in a super-strong earthquake zone is good, and the vibro-replacement stone pile is safe and stable under strong earthquakes.

The application discloses a method for constructing a large-diameter slurry shield tunnel by using a multi-frequency seismic belt, and comprises the following steps: S1, acquiring tunnel size parameters and determining single-pipe size parameters according to the tunnel size parameters; S2, presetting first and last ring pipes, embedding a first steel plate on the outer side of the first and last ring pipes in the ring direction when the first and last ring pipes are formed, and arranging a waterproof rubber strip on the inner side of the first steel plate close to the first and last ring pipes; S3, assembling a shield tunneling machine and adjusting parameters of the shield tunneling machine, and stopping the shield tunneling machine when the shield tunneling machine is excavated to the first and last ring positions of the tunnel; S4, installing the first and last ring pipes, and controlling the first steel plates in each adjacent first and last ring pipe to be aligned in the ring direction, and the waterproof rubber strips to be aligned in the ring direction, so as to form a ring-direction waterproof ring; and S5, continuing shield tunneling and synchronously grouting between the installed pipe segments and the soil, so as to stabilize the peripheral soil. The technical scheme aims to improve waterproof sealing performance during shield tunneling construction and after the tunnel is completed.

The invention discloses a multi-frequency seismic zone large-diameter slurry shield method which comprises the following steps: S1, obtaining tunnel size parameters, and determining size parameters of a single segment according to the tunnel size parameters; s2, pre-arranging first and tail ring segments, when the first and tail ring segments are formed, pre-burying a first steel plate on the annular outer side of the first and tail ring segments, and arranging a water stop rubber strip on the annular inner side, close to the first and tail ring segments, of the first steel plate; s3, a shield tunneling machine is assembled, parameters of the shield tunneling machine are adjusted, and the shield tunneling machine is controlled to stop when tunneling to the head ring position and the tail ring position of the tunnel; s4, the first ring pipe pieces and the tail ring pipe pieces are installed, the first steel plates in the adjacent first ring pipe pieces and the adjacent tail ring pipe pieces are controlled to be aligned in the annular direction of the tunnel, the water stop rubber strips are controlled to be aligned in the annular direction, and annular water stop rings are formed; and S5, shield tunneling continues, and grouting is synchronously conducted between the installed pipe segments and the soil body so as to stabilize the peripheral soil body. According to the technical scheme, the waterproof sealing performance during tunnel shield construction and after a tunnel is completed is improved.

The invention discloses a double-limb steel reinforced concrete thin-wall pier suitable for a high-intensity area and a design method of the double-limb steel reinforced concrete thin-wall pier, and relates to the field of bridge construction design. The combined framework is arranged in the single-limb pier of the pier body; the combined framework comprises profile steel and longitudinal steel plates, the profile steel is arranged on the two sides of the interior of the single-limb pier in the width direction of the single-limb pier, and the profile steel is fixedly connected with main ribs in the single-limb pier; the two sides of the longitudinal steel plate are welded to the two pieces of profile steel respectively, and the longitudinal steel plate is parallel to the width direction of the single-limb pier; and the length directions of the profile steel and the longitudinal steel plates are arranged along the height direction of the single-limb pier. By adopting the scheme, the double-limb steel reinforced concrete thin-wall pier has good bending resistance and torsion resistance through the bending resistance of the section steel in the combined framework and the shearing resistance of the longitudinal steel plates, and the stability of the pier is ensured; meanwhile, due to the high toughness of the steel, the double-limb type steel thin-wall pier shows good anti-seismic performance under the action of an earthquake.

The invention relates to a hydroelectric generation device which is a power generation system which is arranged beside a water resource or in water such as an ocean, a reservoir, a river, a river, a lake and the like, utilizes inexhaustible water resources and is artificially controllable, so that the aim of generating power by recycling the water resources without exhaustion is achieved, and the power generation is generated for at least more than two times. By the implementation of the invention, the water of the power generation resource is inexhaustible, the power generation cost is low, the power generation process is environment-friendly and pollution-free, the structure is easy to arrange, the power generation can be carried out only by avoiding the dangerous areas and seismic zones with seawater backflow or tsunami, and the power generation cost is low. The water resource and man-made controllable power generation system provided by the invention can provide continuous electric energy supply.

This invention discloses a three-dimensional visualization construction management system and method, comprising the following steps: S1. Acquiring construction project information and constructing a three-dimensional digital modeling environment for the construction area; S2. Deploying a sensor network at the construction site and forming a dynamic load dataset; S3. Generating a preprocessed dynamic load dataset; S4. Constructing a gated cyclic element network prediction model using the preprocessed dynamic load dataset to simulate and predict the dynamic response of the construction structure under seismic loading; S5. Applying the Grey Wolf optimization algorithm to globally search and optimize the key hyperparameters of the gated cyclic element network prediction model to obtain an optimized gated cyclic element network prediction model; S6. Based on the three-dimensional visualization results, classifying the dynamic response of the construction structure into risk levels and providing early warning processing, generating construction management decision support information. This invention provides a practical and feasible intelligent management method for construction projects in seismic zones.

The utility model discloses a shock insulation support and relates to the technical field of shock insulation and shock absorption of building structures. In the shock insulation support, a second connecting part of a connecting piece abuts against the surface of a base, a first connecting part enters a storage cavity of the base, and a plurality of dampers are arranged between the first connecting part and the cavity wall of the storage cavity; the first connecting part is arranged in the storage cavity, and the ball is arranged at the joint of the first connecting part and the storage cavity, so that when an earthquake comes, the first connecting part quickly responds to vibration caused by the earthquake under the action of the ball, the connecting piece displaces, the damper is extruded after the first connecting part displaces, and earthquake energy is passively consumed through the damper. When the shock insulation support faces a high-frequency or small-amplitude earthquake, due to the existence of the ball body, the damper is matched, and the shock insulation support can quickly respond and do energy dissipation action to reduce the vibration influence caused by the earthquake.

The invention discloses a transformer used in a seismic zone tunnel and an anti-seismic simulation method thereof, and belongs to the technical field of transformer simulation detection, and the method comprises the following steps: building a transformer structure simulation model; performing static analysis to obtain the maximum stress of the transformer; the first-order vibration frequency of the transformer is obtained through modal analysis, and the first-order vibration frequency of the transformer is used for representing the lowest frequency vibration characteristic generated by the structure of the transformer due to the material attribute when the transformer has no external excitation; performing response spectrum analysis to obtain equivalent stress distribution and an equivalent stress value of the transformer under the simulated seismic load; performing fatigue analysis based on the equivalent stress value of the transformer, and estimating the fatigue strength of the transformer structure; according to the scheme, the transformer can be arranged in a split mode in a seismic zone tunnel, the anti-seismic performance of the transformer in an earthquake can be evaluated, and the structural safety of the transformer is verified by simulating the seismic load waveform and the vibration response.

This utility model discloses a prefabricated building structure for multi-earthquake zones, including a ground surface, prefabricated wall panels, composite beams, and composite slabs. The ground surface is equipped with connecting steel bars and steel shims. The bottom of each prefabricated wall panel has a first embedding groove and a casting groove at its lower part. The first embedding groove is fitted with the steel shims, and the connecting steel bars are embedded in the casting groove. Load-bearing walls are provided between the prefabricated wall panels. The top of each load-bearing wall panel has an upward-opening second embedding groove. The composite beam is embedded in the second embedding groove, and the composite slab is placed on top of the composite beam. This utility model achieves good stability by vertically placing the prefabricated wall panels on the ground and fixing them with grout, then supporting them with an "L"-shaped vertical frame and telescopic support rods. Load-bearing walls are set between the prefabricated wall panels, and the prefabricated wall panels and load-bearing walls are integrated by casting with second connecting steel bars. The two ends of the composite beam are embedded in the second embedding grooves, and the composite slab is placed on the composite beam to form an integrated structure. Reinforcing steel bars are provided on the top of the slab for easy casting, making it suitable for use in multi-earthquake zones.

The application relates to the technical field of data processing, and discloses a method for reproducing damage characteristics of a bridge component in a seismic zone based on a three-dimensional micro model, which comprises the following steps: collecting point clouds of an undamaged bridge and point clouds of a damaged bridge; marking a first target point and a second target point and determining local radii of the first target point and the second target point, and constructing a KD tree; performing point cloud matching on the point clouds of the undamaged bridge and the point clouds of the damaged bridge, determining a matching point of the second target point, defining a near neighbor point, obtaining a damage point cloud clustering cluster, determining an included angle threshold of points in the damage point cloud clustering cluster, continuing to perform point cloud matching in combination with a point cloud matching process, local radii and the KD tree, and obtaining all unmatched points and an unmatched number of the unmatched points; and reproducing damage characteristics of the bridge component according to the unmatched number of the unmatched points and spatial distribution. The application can improve the accuracy of reproducing damage characteristics of the bridge component.

This invention discloses a thin-layer seismic isolation foundation for nuclear power plants in high-intensity seismic zones and its construction method. The seismic isolation foundation includes the nuclear power plant building floor slab and the outer walls of the nuclear power plant building. The floor slab has multiple pre-drilled grouting holes. A foundation pit is sealed below the floor slab, and a pile foundation is installed below the foundation pit. A single-layer pebble cushion layer is laid between the floor slab and the foundation pit. A shallow diaphragm wall is installed below the ground on the outer side of the outer walls of the nuclear power plant building. A tire buffer layer is installed between the outer walls and the shallow diaphragm wall. This invention, by laying a single-layer pebble cushion layer, allows the particles to roll under strong earthquakes, thus isolating the seismic force from further upward transmission and significantly reducing the dynamic response of the nuclear power plant building and reactor building. Point grouting is performed in certain areas of the cushion layer, forming a semi-rigid connection between the floor slab and the foundation pit, allowing the seismic isolation pebble cushion layer to fully exert its seismic isolation effect, while the tire buffer layer provides displacement recovery force.

The invention discloses a curve stiffened band gap unit and a periodic plate structure formed by the curve stiffened band gap unit, the curve stiffened band gap unit comprises a base plate and curve stiffened ribs arranged on the base plate, and the multiple curve stiffened ribs are symmetrically arranged on the same face of the base plate in a crossed mode. The curve stiffened band gap unit is designed through the band gap effect, the stiffened plates can effectively prevent vibration propagation of a specific frequency band, and especially the stiffened plates have a good vibration isolation effect on medium-frequency vibration. The curve stiffened band gap unit is simple in structure and high in reliability, extra energy is not needed, and while the vibration and noise reduction requirements are met, the light weight and the bearing capacity are often difficult to consider at the same time. When the curved reinforced band gap unit is used in large-scale engineering buildings and seismic zone areas, the anti-seismic capacity of the buildings can be effectively improved. According to the curved reinforced band gap unit, through integrated design and machining, the production and construction efficiency is improved, and the building cost is reduced.

The application relates to a method for high-resolution P and S wave velocity ratio time series inversion based on seismic wave arrival time, which comprises the following steps: S1, obtaining P wave and S wave arrival time difference data of a seismic pair; S2, performing linear relationship fitting on the P wave and S wave arrival time difference data to extract average wave velocity ratio of the seismic pair; S3, constructing an initial wave velocity ratio time series according to a seismic time of a seismic sequence; S4, constructing a time series inversion matrix and performing inversion solving on the time series inversion matrix to obtain a wave velocity ratio time series; S5, judging whether the wave velocity ratio time series is stable, if the wave velocity ratio time series is stable, then returning to S3 with time series unknown number plus one, and if the wave velocity ratio time series is not stable, then outputting the inverted wave velocity ratio time series. The application can more accurately reveal the dynamic change rule of the wave velocity ratio of a natural seismic zone or an artificial blasting area.