124 results about "Gravity dam" patented technology

The invention discloses a monitoring and simulation mutual feedback correction concrete dam structure parameter intelligent identification method, and belongs to the technical field of dam safety monitoring, and the method comprises the steps: S1, building a finite element model, and generating a parameter set X through LHS; s2, calculating a water pressure component to obtain a data set Y, and normalizing a sample S = [X, Y]; s3, dividing the training set and the test set according to a ratio of 4: 1, and training a CBLA model; s4, the HST is used for separating the water pressure component, and ICPKO is combined with CBLA for optimization; and S5, iteratively terminating the output of the optimal parameter, and performing finite element verification. According to the concrete dam structure parameter intelligent identification method based on monitoring and simulation mutual feedback correction, the problem that a traditional algorithm is prone to being caught in local optimum is solved, the efficiency and precision of gravity dam structure mechanical parameter feedback are improved, the optimal combination of deformation moduli of a dam body and all partitions of a dam foundation meeting the actual situation is successfully inverted, and the method is suitable for popularization and application. And a new technical means is provided for structural response analysis of the gravity dam in the operation period.

The present application belongs to the technical field of mass concrete construction, and aims to solve the problem of high thermal resistance and slow heat dissipation of traditional cooling pipe laminar bottom layer, and discloses a gravity dam construction cooling water pipe based on destruction of laminar bottom layer and a method thereof. The cooling water pipe comprises a plurality of series water pipe units, each water pipe unit comprises a steel pipe, a flexible spring hose is arranged in the steel pipe, and the spring hose forms a spiral protruding turbulence structure along the inner wall of the steel pipe; the hose is fixed by pointwise anchoring and outer wall surface bonding with glue, and a ring is arranged at both ends for limiting and assisting turbulence. The present application breaks through the thermal resistance of laminar bottom layer, greatly improves the hydration heat conduction efficiency, is convenient to construct and has durable structure, and is suitable for mass concrete temperature control requirements.

The invention belongs to the technical field of gravity dam construction, and provides an assembled concrete cooling pipe structure and method for gravity dam construction. The cooling pipe is composed of a plurality of pipe body units connected in series, and lining pieces are arranged in metal pipes of the pipe body units. The lining piece and the elastic steel sheets form a criss-cross cage type structure through the strip-shaped plates, the strip-shaped plates are provided with pitted surfaces and notches, the steel sheets can stretch out and draw back to achieve variable-diameter adjustment, and water flow can be forced to generate turbulent flow to damage the laminar flow bottom layer. The method comprises the steps of raw material pretreatment, notch and pitted surface machining, lining piece assembling, metal pipe assembling and fixing and pipe body unit series connection. The structure is stable, manufacturing is convenient, boundary layer thermal resistance can be reduced, heat transfer efficiency is improved, concrete temperature cracks are reduced, and the gravity dam construction requirement is met.

The invention discloses a quantitative evaluation method for the ultimate seismic capacity of a gravity dam. The quantitative evaluation method comprises the steps that S1, a gravity dam-foundation system finite element analysis model considering strength and stable damage at the same time is constructed; s2, scaling a design earthquake to different earthquake intensity levels by adopting an incremental dynamic analysis method; s3, carrying out multiple groups of nonlinear dynamic response analysis to obtain a strong shock response result of the gravity dam-foundation system; s4, based on the response result, constructing an evaluation index for representing the anti-seismic performance of the gravity dam-foundation system; and S5, constructing a broken line graph in which different performance evaluation indexes change along with different zoom coefficients, and determining the ultimate seismic capacity of the gravity dam according to the zoom coefficient corresponding to the maximum slope in the broken line graph. According to the method, gravity dam-foundation system anti-seismic safety evaluation is developed from a single failure mode and a single index to comprehensive consideration of multiple failure modes and multiple evaluation indexes, the synergistic effect of multiple failure mechanisms in actual engineering is reflected, and a theoretical basis is provided for anti-seismic safety evaluation and risk management.

The invention discloses an open-web gravity dam deformation prediction and mechanism interpretation method, system, equipment and medium, and belongs to the technical field of dam and hydraulic structure health monitoring and state evaluation. Constructing the preprocessed monitoring data into corresponding feature vectors, dividing a time sequence data set, and performing XGBoost model training and hyper-parameter optimization to obtain a prediction model; calculating a corresponding SHAP value, and screening a key factor as an independent variable for model analysis; and selecting a control index to evaluate the performance of the model, and deploying the model to a dam safety monitoring system after verification so as to carry out real-time prediction and early warning. According to the method, while high-precision deformation prediction of the open-web gravity dam is realized, quantifiable mechanism explanation of the prediction result is provided, so that transparent and reliable decision support is provided for safety monitoring and early warning of the dam.

The invention discloses an in-situ shear test device and method for a new and old concrete junction surface of a gravity dam heightening project. The in-situ shear test device comprises a test platform, a shear loading groove, an L-shaped test block, a flexible shear plate, a shear loading device and a normal loading device, the shear loading groove is formed in the slope surface of the old concrete dam above the test platform; the transverse part of the L-shaped test block is embedded into the shear loading groove, and a flexible shear plate is arranged between the transverse part and the shear loading groove; the vertical part and the slope surface of the old concrete dam form a new and old concrete combination surface; the centroid of the L-shaped test block is positioned on a new and old concrete combination surface; a shear force application axis of the shear loading device is positioned on a new and old concrete junction surface coincidence; and the normal loading device is mounted on the outer side surface of the vertical part of the L-shaped test block and can apply a vertical normal force to the new and old concrete combination surface. The real interface working condition is constructed through the L-shaped test block, the embedded anchoring system and the two-way cooperative loading technology are combined, the problem of construction of the counter force of the inclined dam face is solved, and actually measured data support is provided for anti-sliding stable design of the high-gradient dam body.

The invention discloses a gravity dam safety risk management and control method based on a knowledge graph and a large model, and the method comprises the steps: constructing a gravity dam safety risk space-time knowledge graph which comprises an entity layer, a relation layer, an attribute layer and a time-space mapping layer, and achieving the full-life-cycle multi-source data structured association; constructing a knowledge enhanced large model, and embedding the space-time knowledge graph into a reasoning process; real-time and historical data of the gravity dam are collected and preprocessed, and the large model is input; calling a map association relationship and an evolution rule through a large model to complete risk anomaly identification, cause positioning and evaluation; historical cases and industry specifications in the atlas are retrieved, and a management and control decision scheme matched with the current working condition is generated; and collecting scheme execution data, extracting new knowledge and updating the graph. According to the invention, a closed-loop management and control mode is constructed, and the intelligent and refined level of risk management and control is improved.

The invention relates to the technical field of data processing, in particular to a concrete gravity dam operation period safety risk value calculation method and system.The method comprises the steps that structure monitoring data, environment data and operation data of a dam body in the operation period are continuously collected through a safety monitoring system; carrying out preprocessing and standardization, coordinate conversion and risk feature extraction on the collected data, and obtaining fusion state data through data fusion processing; constructing a dam body operation environment parameter set according to the environment data, and calculating a safety risk value by using a deep belief network model in combination with the environment parameter set and the fusion state data; and dividing risk levels according to the security risk values and outputting early warning information. According to the method, dynamic quantitative evaluation of the safety risk of the concrete gravity dam in the operation period is realized through multi-source data fusion and a deep learning technology, and a scientific basis is provided for dam body safety management and risk early warning.

The invention discloses a reservoir water fluctuation propagation direct numerical simulation method and device in gravity dam anti-seismic analysis, a medium and equipment. According to the method, fluctuation propagation in reservoir water under combined incidence of P waves and SV waves is considered, a reservoir water-foundation site free field is analyzed and calculated on the basis of the fluctuation theory and the potential function theory, then the site free field is converted into node counterforce on fluid and solid boundaries on the basis of a fluid and solid power artificial boundary substructure model, and the reservoir water-foundation site free field is obtained. Applying node counterforce on the reservoir water-foundation artificial boundary, and directly performing numerical simulation on reservoir water-foundation site free field response; based on a static-dynamic artificial boundary conversion method, considering the influence of the static effect of the gravity dam-reservoir water-foundation system on the dynamic effect of the system, and constructing a gravity dam seismic oscillation input model for directly simulating reservoir water fluctuation propagation; according to the method, the anti-seismic analysis precision of the gravity dam is improved, and the limitations of single-wave incidence during reservoir water fluctuation propagation simulation, failure to consider the static effect and the like are overcome.

The invention discloses a gravity dam structure defect identification method based on a knowledge graph, and the method comprises the steps: constructing a gravity dam structure defect knowledge graph based on a gravity dam structure defect-monitoring representation coupling mechanism; extracting abnormal data in the working feedback data of the gravity dam, performing standardized fusion processing on the abnormal data, and then accessing the abnormal data into the gravity dam structure defect knowledge graph; performing forward causal propagation and reverse traceability propagation in the gravity dam structure defect knowledge graph accessed with the abnormal data, and determining a defect forward evolution link and a defect reverse traceability link; and introducing an attenuation factor to carry out path weight reconstruction on the defect forward evolution link and the defect reverse traceability link, carrying out path screening according to the reconstructed total weight, and taking the screened path as a gravity dam structure defect identification basis. According to the method, the incompleteness of empirical knowledge based on historical cases and numerical analysis is effectively compatible, the uncertainty of an actual physical process is reflected, and the dynamic evaluation of the multi-defect co-evolution path is realized.

The invention provides a gravity dam crack control construction device and process based on strain gradient construction, and belongs to the technical field of gravity dams. The construction device comprises an outer pipe assembly and an inner pipe assembly used in cooperation with the outer pipe assembly. The technology comprises the steps of S1, construction preparation, S2, foundation treatment, S3, formwork steel bar installation, S4, outer pipe assembly installation, S5, concrete pouring, S6, hole cavity construction, S7, inner pipe assembly positioning and installation, S8, outer layer stress absorbing material filling, S9, inner pipe assembly pipe drawing and S10. And filling an inner-layer stress absorbing material to construct a concentric circle type strain gradient structure. A traditional'strong constraint 'anti-cracking thought is broken through, an active anti-cracking mode of'stress absorption + gradient buffering' is turned, two layers of materials can more uniformly share loads through a gradient conduction mechanism, the overall energy consumption efficiency is improved, the anti-cracking effect is more remarkable, the structural durability is enhanced, and the method is particularly suitable for construction of high dams and gravity dams under complex geological conditions and has a wide application prospect. And the method has obvious engineering application value.

The invention discloses a concrete gravity dam structure with a cavity and a construction method thereof, and belongs to the technical field of water conservancy and hydropower engineering. The structure comprises a dam body, an anti-sliding structure, a weight reduction cavity and a gallery structure. The dam body is composed of a dam foundation arranged in the rock mass and a dam body poured on the dam foundation. The anti-sliding structure is a concrete anti-sliding plug which is formed at the bottom of the dam foundation and embedded into the bedrock. The weight reduction cavity is formed in the dam body in the axis direction of the dam. The gallery structure comprises a plurality of galleries arranged along the axis of the dam, a dam foundation grouting curtain is arranged at the bottom of the upstream gallery, and drainage structures are arranged in the galleries. By arranging the cavity in the dam and the steep dam slope, the using amount of concrete can be obviously reduced; an anti-sliding plug is used for providing passive anti-sliding force instead of resisting sliding force through dam foundation anti-sliding force generated between the self weight of a common gravity dam and a dam foundation rock mass, and meanwhile, a pre-stressed anchor cable constructed from a corridor is used for actively reinforcing and adjusting pre-tightening force so as to regulate and control dam foundation stress, so that the requirement of the dam foundation stress is met; seepage is controlled by combining a curtain and a drainage system. On the premise that the safety and stability of the dam body are guaranteed, the construction cost is effectively reduced, and remarkable economical efficiency and technical advantages are achieved.

This invention belongs to the field of hydraulic structure analysis technology, specifically disclosing a gravity dam coupling analysis method, system, electronic equipment, and storage medium, including: models describing water flow in concrete, the relationship between water pressure and stress, the dissolution reaction process, and the coupling of ion diffusion with water flow. By acquiring influencing variables, parameters of each model are correlated, and a solubility function considering performance parameters is established and dynamically updated. The solubility function is iteratively trained using experimental data to construct a finite element model, and simulations are performed based on the trained function. Early warnings are generated based on the simulation results to predict the concrete deterioration process and optimize maintenance decisions. It has the following advantages: by coupling multiple models such as water flow, chemical dissolution, and hydraulic fracturing, the long-term deterioration process of concrete under the action of water flow and dissolution is accurately simulated. The introduction of a solubility function and dynamic updating of material parameters, considering time-varying deterioration effects, comprehensively improves the accuracy of deterioration prediction and simulation results.

The layered water taking system based on the gravity dam comprises a vertical shaft, three vertical shaft type water taking openings are sequentially formed in one side of the upstream of the vertical shaft, the three vertical shaft type water taking openings are arranged according to the dead water level and the normal water storage level elevation of a reservoir, and the three vertical shaft type water taking openings are each provided with an overhauling mechanism. The layered water taking system based on the gravity dam solves the problems that an existing conventional maintenance system of the gravity dam depends on a single valve form, when a valve breaks down, a reservoir needs to be emptied for maintenance, and water taking continuity is seriously affected, and later maintenance is facilitated.

The invention discloses a segmented quantitative analysis method for uplift pressure of a gravity dam. The uplift pressure of the gravity dam is influenced by various factors, and safety monitoring data of the gravity dam often have the problems of multiple collinearity and small samples. The method comprises the following steps: introducing a BFAST time sequence decomposition method, decomposing original uplift pressure monitoring data into a trend component and a seasonal component, and obtaining trend segment points and seasonal segment points; a Bayesian model average modeling method integrating Bayesian model selection is introduced, and a gravity dam uplift pressure statistical model is established in a segmented mode; and finally, upstream and downstream water pressure components of the uplift pressure are separated according to the average multiple models, and quantitative analysis of the uplift pressure of the gravity dam is achieved. According to the method, more accurate fitting and component separation effects can be obtained, and accurate quantitative analysis of the uplift pressure of the gravity dam can be realized.

The invention provides a tunnel system safety evaluation method based on a unit danger coefficient. The tunnel system safety evaluation method comprises the following specific steps that surrounding rock and lining structure unit danger coefficients are defined; an anchor rod unit danger coefficient is defined, and danger coefficients of an anchor rod body and an anchor rod interface are defined; defining a surrounding rock-anchor rod-lining system and a safety evaluation index, defining the surrounding rock-anchor rod-lining system formed by a rock mass, an anchor rod and a lining within an anchor rod reinforcing range, and establishing a danger coefficient index of the surrounding rock-anchor rod-lining system; and a damage grading standard is established, and a tunnel damage grading standard based on the unit danger coefficient EDC is established in combination with a gravity dam earthquake damage analysis result. According to the method, the surrounding rock-anchor rod-lining system can be used for evaluation, the danger degree of the surrounding rock, the anchor rod and the lining of each part of the tunnel and the danger degree of the surrounding rock-anchor rod-lining system can be visually given, the stability of the tunnel can be evaluated very conveniently, and engineering design can be guided.

The invention provides a fishway and dam integrated device integrating multi-depth entrances and exits and multi-direction water replenishing and fish luring and an operation method, and belongs to the technical field of fishways. The device comprises a gravity dam section, a stepped fishway integrated in the gravity dam section and a water replenishing pipeline pre-buried in a wall body of the gravity dam section; the upstream side and the downstream side of the gravity dam section are provided with multi-elevation entrances and exits and matched gates respectively, a fishway bottom plate and partition plates of the stepped fishway are distributed in a stepped mode, and the water supplementing pipeline is provided with multi-direction water supplementing sprayers around the fishway entrance. According to the operation method, through cooperative opening and closing of multi-depth inlets and outlets, multi-direction and multi-flow-speed fine regulation and control of water supplementing nozzles, stepped fishway energy dissipation and flow aiding and dam water retaining mode switching, fishway and dam structure function integration is achieved. Extra land acquisition and pouring are not needed, the engineering cost and construction difficulty are reduced, the method can adapt to dynamic changes of the water level of the reservoir, migration depth preferences of different fishes are considered, the fish luring and passing efficiency is improved, and the fish passing window period is prolonged.

The invention relates to the technical field of water conservancy and hydropower engineering design, in particular to a gravity dam forward design method and related products. Obtaining a standard cross section; generating a segmented three-dimensional entity model of the gravity dam; the anti-sliding stability safety coefficient of the target bank slope dam section is calculated; the stability of the target bank slope dam section is verified according to the anti-sliding stability safety coefficient, and a final design scheme of the gravity dam is obtained; according to the method, meteorological and hydrological parameter calculation, two-dimensional section design optimization and three-dimensional entity model generation are integrated, direct association and data linkage of a calculation model and a three-dimensional design model are achieved, the design cooperation efficiency is improved, and errors possibly introduced by manual data transmission are avoided.

The application belongs to the technical field of gravity dam construction, and proposes an assembled concrete cooling pipe structure and method for gravity dam construction. The cooling pipe is composed of a plurality of series-connected pipe body units, and a metal pipe of the pipe body unit is provided with an inner lining piece; the inner lining piece forms a longitudinal and transverse interlaced cage structure through a strip-shaped plate and an elastic steel sheet, the strip-shaped plate is provided with a rough surface and a notch, the steel sheet can be stretched and contracted to realize diameter adjustment, and can forcibly generate turbulent flow to destroy the laminar flow bottom layer. The method includes raw material pretreatment, notch and rough surface processing, inner lining piece assembly, metal pipe assembly and fixation, and pipe body unit series connection. The application has stable structure, convenient manufacturing, can reduce the boundary layer thermal resistance, improve the heat transfer efficiency, reduce the concrete temperature cracks, and is suitable for the construction requirements of gravity dam.

The present invention proposes a construction device and process for controlling cracks in a gravity dam based on the construction of a strain gradient, belonging to the field of gravity dam technology. The construction device includes an outer tube assembly and an inner tube assembly used in conjunction with the outer tube assembly; the process includes S1. Construction preparation, S2. Foundation treatment, S3. Installation of formwork reinforcement, S4. Installation of the outer tube assembly, S5. Concrete pouring, S6. Hole construction, S7. Positioning and installation of the inner tube assembly, S8. Filling the outer layer with stress-absorbing material, S9. Pulling out the inner tube assembly, and S10. Filling the inner layer with stress-absorbing material creates a concentric strain gradient structure. This invention breaks away from the traditional "strong constraint" crack resistance approach and turns to an active crack resistance mode of "stress absorption + gradient buffering." The gradient conduction mechanism allows the two layers of material to share the load more evenly, improving overall energy efficiency, achieving a more significant crack resistance effect, and enhancing structural durability. It is particularly suitable for the construction of high dams and gravity dams under complex geological conditions, and has significant engineering application value.

The application discloses a kind of semi-covering layer semi-bedrock foundation gravity dam foundation seepage prevention water stop design method, belong to the field of hydraulic engineering design.This application method is aimed at the complex conditions of semi-covering layer semi-bedrock foundation, adopts zoning combination seepage prevention scheme: bedrock region sets seepage prevention curtain, covering layer region sets seepage prevention wall;Comprehensive construction period structure dead weight, running period structure dead weight, water pressure, uplift pressure and other loads, design seepage prevention wall top and dam foundation embedded joint and dam bottom local structure, reserve deformation and with two purple copper water stop to realize water stop by asphalt mortar joint filling;Finally, the rationality of scheme is verified by three-dimensional finite element seepage deformation numerical calculation.This application breaks through the limitation of traditional design, provides quantitative design method, and has strong operability, provides technical support and reference for similar projects.

The invention relates to the technical field of water conservancy and hydropower engineering, and discloses a high-altitude gravity dam freeze-thaw cycle finite element simulation method which comprises the following steps: S1, establishing a gravity dam finite element discrete model; s2, constructing a pore water phase change physical model according to the global environment parameters; s3, establishing a full-coupling control equation set according to the ice saturation; and S4, solving the full-coupling control equation set through a multi-physics field coupling strategy, and obtaining field variable data. According to the method, accurate physical modeling of high-altitude environmental factors is realized, and the fidelity of a simulation result under a specific regional condition is greatly improved; a more complete multi-physical field coupling frame is constructed, and the internal mechanism of concrete performance degradation under the freezing and thawing effect is accurately captured; refined panoramic information of the internal state of the structure is provided, and the high-resolution data provides a scientific basis for deep understanding of a damage mechanism of the gravity dam, quantitative evaluation of the structure safety, prediction of the service life and formulation of a maintenance and reinforcement strategy.

This invention relates to the field of water conservancy and hydropower engineering design technology, specifically to a forward design method for gravity dams and related products. The method includes calculating the length of the maximum wind zone and determining the dam crest elevation; obtaining a standard cross-section; generating a segmented three-dimensional solid model of the gravity dam; calculating the anti-sliding stability safety factor of the target bank slope dam segment; verifying the stability of the target bank slope dam segment based on the anti-sliding stability safety factor; and obtaining the final design scheme of the gravity dam. This invention integrates meteorological and hydrological parameter calculation, two-dimensional cross-section design optimization, and three-dimensional solid model generation, realizing direct correlation and data linkage between the calculation model and the three-dimensional design model, improving the collaborative efficiency of the design, and avoiding errors that may be introduced by manual data transmission.

This invention proposes a method for treating seepage in transverse joints of concrete gravity dams, belonging to the field of water conservancy and hydropower engineering. The method includes the following steps: First, a first composite seepage interception layer is constructed at the transverse joint on the upstream dam face. This first composite seepage interception layer consists of a plastic water-stopping material embedded in the U-shaped groove of the transverse joint and a polyurea elastic coating covering the dam face and the transverse joint. Second, a second elastic water-stopping seepage barrier is constructed between the two water-stops at the dam crest. This second elastic water-stopping seepage barrier consists of a water-soluble polyurethane grout solidified and injected into boreholes along the joint. Third, a third drainage channel is constructed downstream of the second water-stop. This third drainage channel consists of drainage holes along the joint that penetrate the transverse joint to the lower gallery. This invention adopts a three-in-one technical concept of "interception-blocking-drainage." The upstream dam face intercepts and prevents reservoir water from directly entering the joint surface; the middle water-stop seals the seepage channels inside the transverse joint; and the downstream drainage holes drain residual seepage from the transverse joint. These three lines of defense work together to form a complete and reliable seepage prevention system.

The invention discloses a finite element analysis method for reducing concrete tensile stress through a transverse joint grouting measure. Comprising the following steps that a concrete gravity dam discharge dam section and foundation model is established, finite element software is imported, and numerical simulation parameters are set; grid division is carried out on the model, and grids in the runner are encrypted; constraint and load are applied, elastic support is applied to the side surface of the dam section, and transverse joint grouting measures are simulated; and solving the model by using finite element software, and evaluating stress results of an inlet section, a gate slot section and a breast wall section of the discharge dam section. The device has the advantages that elastic support is applied to the side surface of the dam section, and the effect of transverse joint grouting measures on the dam section is simulated. Quantitative calculation results show that transverse joint grouting measures can increase the lateral rigidity of the dam section, improve the stress state of concrete and reduce the tensile stress of the concrete in the flow channel, so that the use amount of steel bars in the flow channel is reduced, and the method is safe, economical and convenient to construct.

The application relates to a cleaning robot and a cleaning method suitable for various dams, belonging to the technical field of dam surface cleaning, and comprising a shell, a navigation assembly, a cleaning assembly, a sensor group and a pump group for providing suction power, wherein the navigation assembly comprises a posture adjusting water tank arranged in the shell, and direction water spraying devices are arranged in the circumferential direction and the axial direction of the shell; the cleaning assembly comprises cleaning water spraying devices arranged in the circumferential direction of the shell, and the cleaning water spraying devices are provided with water pipes; and the sensor group is arranged at the bottom of the shell. The application can be applied to the cleaning of the surface attachments of different dam types, such as face slab dams, gravity dams and arch dams, the landing posture and the moving direction of the robot are determined through the sensor group, the spatial posture of the robot is adjusted through the posture adjusting water tank, and the purposes of cleaning the dam surface, driving the robot to rotate and expanding the cleaning area are simultaneously achieved through the cleaning water spraying devices.

The invention relates to the technical field of construction of roller compacted concrete gravity dams in water conservancy and hydropower engineering, in particular to a construction method for continuous multi-dam-section rapid pouring of dam foundation cushion layer concrete of a roller compacted concrete dam. According to dam foundation cushion concrete, by means of measures of building a road in advance, directly replacing traditional bamboo plywood with asphalt cedarwood boards for formworks and the like, the situation that in the conventional pouring process, damage and pollution are caused to a dam section foundation surface due to the fact that an automobile enters a warehouse through adjacent dam sections, and then the foundation surface is cleaned repeatedly is reduced; compared with the tedious procedures of one-bin cleaning, one-bin checking and accepting, one-bin pouring and one-bin re-cleaning circulation in the prior art, the pouring efficiency of the low-slump distorted concrete of the dam foundation cushion layers of the adjacent dam sections is greatly improved, and the rapid and continuous pouring construction method is formed.

The invention belongs to the field of hydraulic explosion detection, and particularly provides a rapid identification method, system and equipment for underwater near-field explosion damage of a concrete gravity dam, and the method comprises the steps: building a corresponding relation among different striking positions, different damage degrees of the dam and different natural vibration frequencies of the dam to form a database; arranging a plurality of acceleration sensors in the dam body; when the dam is subjected to explosion attack, actual measurement data including time and acceleration of each measurement point are obtained through an acceleration sensor, and the actual measurement data are represented by an acceleration-time curve graph; according to the acceleration-time curve graph of each measuring point, the maximum acceleration value of each measuring point is obtained, the maximum acceleration values of all the measuring points are compared, and the elevation of the measuring point with the maximum value is the explosion source elevation; inverting the natural vibration frequency of the dam according to the obtained acceleration data, and comparing the natural vibration frequency with data in a database to determine the damage degree of the dam. The method is used for rapidly identifying the explosion source position when the gravity dam is hit and the dam damage degree caused by explosion.

The invention discloses a gravity dam foundation treatment structure used under the condition of a strong earthquake region soft rock foundation. The invention relates to the field of water conservancy and hydropower facilities, in particular to a gravity dam foundation treatment structure for solving the problems of bearing capacity and anti-sliding stability of a gravity dam foundation under the condition of a soft rock foundation in a strong earthquake region, which comprises a foundation surface of a gravity dam, a consolidation grouting layer, a cast-in-place pile and a concrete dam body, a consolidation grouting layer is arranged below the foundation surface, the cast-in-place piles are arranged below the concrete dam body, the tops of the cast-in-place piles are fixedly connected with the bottom of the concrete dam body, and the bottom of at least one cast-in-place pile is arranged below the three-type rock mass boundary. The method is particularly suitable for gravity dam foundation treatment construction under the condition of a soft rock foundation in a strong earthquake region.

The invention provides a polyurea anti-seepage gravity dam and a construction method thereof.The polyurea anti-seepage gravity dam comprises a dam body formed by filling low-strength homogeneous concrete, the dam body serves as a resistance main body of the gravity dam, and a foundation cushion layer and a reinforcing and anti-seepage structure are arranged between a dam foundation and bed rock of the dam body; a polyurea impermeable layer is integrally laid on the concrete surface of the dam face on the upstream side of the dam body. A plurality of vertical transverse joints are arranged in the dam body in the dam axis direction at intervals, a water stop structure is arranged at each vertical transverse joint of the dam body, and an expansion joint protruding towards the upstream is arranged at the upstream end of each vertical transverse joint. The polyurea impermeable layer comprises a permeable primer layer, a composite reinforcing layer and a sealing surface layer which are sequentially arranged outwards from the upstream dam face. The problems that in the construction and operation process of a traditional concrete gravity dam, cracks are prone to being generated, the overall structure is complex, and the construction quality of a water stop part is difficult to control are solved.