38 results about "Rockfill material" patented technology

The invention provides a rockfill material parameter multi-target inversion method and system based on parameter decision, and the method comprises the steps: simulating an obtained Duncan-Zhang E-B model parameter based on a finite element model for constructing a rockfill dam, carrying out the calculation to obtain a dual-target function value, and determining a key parameter of a measurement point; generating a sample data set based on the key parameters, inputting the sample data set into an XGBoost model for training, inputting the key parameters into the trained XGBoost model, performing calculation to obtain a multi-objective function value, constructing a candidate solution set based on a particle swarm, the multi-objective function value and a dual-objective function value, and performing individual optimization and iterative updating to obtain an optimal solution set; inputting the optimal solution set into a composite decision index model, calculating to obtain composite decision index values, extracting the optimal solution set corresponding to the minimum value in the composite decision index values, and obtaining optimal parameters; and inputting the optimal parameter into the finite element model, and calculating to obtain an inversion result. According to the method, the parameter inversion precision, the physical rationality and the engineering applicability are improved.

The present invention relates to the field of computers and the field of hydraulic structures. Disclosed is an integrated rockfill dam deformation analysis method based on the integration of multiple professional models, the method comprising the following step: S1, using a parameter back-analysis method to establish a constitutive model for rockfill materials. Further disclosed is a rockfill dam deformation analysis system based on the integration of multiple professional models, the system comprising a parameter back-analysis module, which is used for establishing a constitutive model for rockfill materials. Moreover, further disclosed is a rockfill dam deformation analysis device based on the integration of multiple professional models, the device comprising a cluster management host, which is responsible for resource allocation and management of an entire device network. Using containerized WebSocket technology greatly simplifies real-time data exchange and communication between containers; moreover, in a complex data processing flow, an output of step S1 can immediately serve as an input of step S2, and an output of step S2 can immediately serve as an input of step S3; and the "single communication, persistent connection" advantage based on the WebSocket technology reduces the communication load of servers.

The invention discloses a rockfill material humidification strain result prediction method, and relates to the technical field of hydraulic engineering, the method comprises the following steps: obtaining a humidification test result of a rockfill material sample; wherein the humidification test result records the humidification volume strain and the humidification shear strain under the action of the humidification ball stress and the humidification deflection stress; according to the humidification test result, a first relation curve between the humidification volume strain and the humidification ball stress and a second relation curve between the humidification shear strain and the humidification deflection stress are obtained; acquiring a humidifying volume strain result of the target rockfill material according to the first relation curve, and acquiring a humidifying shear strain result of the target rockfill material according to the second relation curve. According to the technical scheme provided by the embodiment of the invention, the labor cost and time cost consumed in the prediction process are reduced, the acquisition efficiency of the humidifying strain result of the rockfill material is improved, the experience dependence on designers is avoided, and the accuracy of the humidifying strain prediction result of the rockfill material is improved.

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a self-compacting rock-fill concrete dam body construction method which comprises the following steps: rock-fill body construction: screening out rock-fill materials with the particle size of not less than 300mm, and conveying the rock-fill materials to a foundation surface in a bin to form rock-fill bodies with gaps; self-compacting concrete body construction is conducted, specifically, self-compacting concrete is pumped to the upper portion of the rockfill body, the self-compacting concrete flows to fill gaps between the rockfill materials, and the self-compacting concrete is solidified and hardened into a self-compacting concrete body 3; the particle size of coarse aggregate in the self-compacting concrete is not larger than 20 mm, and the content of needle-sheet-shaped particles is not larger than 8%. According to the method, the particle size of the rockfill material is limited, and the particle size of coarse aggregate and the content of needle-sheet-shaped particles in the self-compacting concrete are limited; the self-compacting concrete can be fully filled into gaps between dam bodies of rockfill materials, so that the compactness of the dam bodies is improved, the risk of dam body engineering structure damage is reduced, and the construction quality of the dam bodies is improved.

The invention belongs to the field of geotechnical engineering, and relates to a method for determining particle strength distribution in a rockfill material humidifying process. According to the method, the change relation of the moisture content of the particles along with the humidifying time is tested in a particle soaking humidifying test, the probability distribution of the particle strength under different humidifying durations is given, and a probability distribution function of the particle strength under different moisture content conditions and a parameter determination method thereof are provided. The method lays a foundation for simulating the rockfill material humidifying process through a discrete element method, tracking particle structure evolution in the humidifying process, exploring the rockfill material humidifying deformation mechanism and finely analyzing the stress deformation state in the rockfill dam humidifying process. The method can be further applied to hydroelectric and wind-solar complementary power stations to determine reservoir water level operation schemes and provide technical support for increasing benefits of the complementary power stations.

The application discloses a rockfill material gradation detection method and device based on unmanned aerial vehicle aerial survey and instance segmentation, and comprises the following steps: establishing a conversion relationship between surface gradation and overall gradation by relying on local surface rockfill material images before density pit excavation and rockfill material screening results of the density pit; obtaining a rockfill dam filling bin surface image by using unmanned aerial vehicle close-range photogrammetry technology; generating an orthographic image of the filling bin surface; making an image dataset based on the orthographic image; training an instance segmentation model jointly constructed by YOLOv8 and Unet to obtain an instance segmentation model for rockfill material segmentation; obtaining an orthographic image of a rockfill dam filling bin surface to be predicted and cutting it into small blocks, using the instance segmentation model to perform prediction, realizing pixel-level instance segmentation and morphology extraction; splicing the predicted blocks, performing morphology quantitative analysis on the rockfill material instances obtained by prediction, and obtaining overall bin surface rockfill gradation through gradation conversion. The application realizes accurate and efficient gradation detection of overall bin surface rockfill.

The invention provides a rockfill material excavation efficiency monitoring method and device. The method can significantly improve the recognition precision of the interaction action of the excavator and the truck in a complex shielding scene, and improves the judgment accuracy of the working state of the equipment, thereby effectively calculating the utilization rate of the construction equipment and the collaborative operation efficiency, and optimizing the earthwork scheduling management.

The invention discloses a three-dimensional random field-based rockfill material space variability discrete element simulation method. The method specifically comprises the following steps of: 1, constructing a triaxial test discrete element model and determining related parameters; step 2, generating a three-dimensional random field based on Karhunen-Loeve expansion; and step 3, random interpolation and assignment of particle contact parameters. Aiming at the technical defect that the real mechanical behavior of the rockfill material cannot be accurately reflected due to the fact that homogeneous hypothesis, two-dimensional modeling and continuous medium analysis are generally adopted in the prior art, the method comprises the following steps: constructing a three-dimensional random field of the rockfill material and introducing a discrete element particle system; more reasonable and more practical description of rockfill material space variability, macroscopic mechanical characteristics and mesoscopic mechanism deformation is realized.

The invention discloses a dam rockfill material compaction quality prediction method based on THO-XGBoost, and the method comprises the steps: obtaining input parameters and output parameters of a dam rockfill material compaction process, the input parameters at least comprise a material source characteristic parameter and a rolling characteristic parameter, and the output parameter is rolling dry density; converting the material source characteristic parameters, the rolling characteristic parameters and the rolling dry density into a unified space-time reference coordinate system by utilizing multi-source heterogeneous information integration and space-time association, realizing space-time registration of input and output data, and generating a compaction quality data set; and constructing an XGBoost integrated learning model based on the compaction quality data set, performing global optimization on hyper-parameters of the XGBoost model by adopting a Heman optimization algorithm introducing Tent chaotic mapping, establishing a compaction quality prediction model based on THO-XGBoost, and realizing high-precision prediction of the compaction quality. According to the method, the precision and stability of rockfill material compaction quality prediction are effectively improved, the dependence on detection of a large number of test pits is reduced, and a basis is provided for construction quality control and process optimization.

The application discloses a construction method for content control filling of fine particle rockfill of a rockfill dam, and belongs to the technical field of design and construction of hydraulic and hydroelectric engineering buildings. The construction method can effectively improve the filling quality of the rockfill dam, and the particle size of the rockfill of each part of the rockfill dam meets the requirements. The construction method comprises the following steps: firstly, the rockfill dam body and the rockfill yard are divided into zones; then, the rockfill mining and the rockfill filling are carried out in a one-to-one correspondence according to the rockfill dam body zoning and the rockfill yard zoning; the quality of each rockfill dam layer is detected; the fine particles with excessive content are removed from the rockfill of the outer area of the rockfill dam body and / or the filling area of the upper part of the rockfill dam body in the rockfill transfer process; and the surface broken fine powder layer exceeding the standard after the paving and rolling of each filling layer are scraped off before the filling of the next layer of rockfill.

The application provides a rockfill dam seismic response randomness analysis method based on a test database, and belongs to the technical field of hydraulic engineering. First, a coarse-grained soil dynamic property database Geo-Gravel is constructed, and a deep learning model based on given physical parameters to generate corresponding dynamic parameters is trained; second, a finite element model and a material parameter random field are constructed, and the material parameter random field is assigned to the finite element model; third, the dam body dynamic response is obtained through calculation by using a finite element software; finally, the extreme values of the displacement and acceleration of the dam body dynamic response and the probability distribution thereof are counted, and the statistical results are analyzed to quantify the influence of the material physical parameter randomness on the dam body dynamic response. The application can effectively reduce the test cost, truly reflect the spatial variation characteristics of the rockfill material, and show through the probability distribution analysis that the parameter randomness significantly influences the dynamic response result, and the dispersion degree and the variation coefficient are positively correlated, thereby providing a reliable basis for seismic design.

The invention discloses a three-dimensional point cloud-based rockfill material grading detection method, and relates to the technical field of rockfill material grading detection. The method comprises the following steps: acquiring three-dimensional point cloud data of paved stone particles by utilizing laser scanning, and projecting the three-dimensional point cloud data along an overlook direction to generate a depth map; inputting the depth map into an instance segmentation model, and extracting a segmentation mask of each particle; the masks are mapped back to the point cloud, so that accurate segmentation of the three-dimensional particles is realized; further extracting the three-dimensional morphological characteristics of each particle, and predicting the particle volume and particle size based on the characteristics; and finally, finishing grading statistics and grading curve drawing of the rockfill material in combination with particle size and volume information of the particles. The rockfill material grading detection device can efficiently and accurately realize rockfill material grading detection, and has the advantages of high precision, high automation degree and the like.

This application discloses an in-situ measurement device, method, equipment, and medium for the elastic modulus of dam rockfill. The in-situ measurement device for the elastic modulus of dam rockfill includes: a pre-embedded component, installed on the previous compacted layer of the dam rockfill, used to measure the thickness of the current compacted layer; a counterweight, used to apply pressure to the rockfill in the area to be inspected in the current compacted layer, causing compression deformation of the rockfill; a leveling component, associated with the counterweight, used to measure the deformation of the rockfill caused by the counterweight; and a measuring unit, connected to both the pre-embedded component and the leveling component, to determine the in-situ parameters of the elastic modulus of the dam rockfill based on the thickness of the current compacted layer and the deformation of the rockfill. Using this application, the thickness of the compacted layer is measured by the pre-embedded component, and the deformation of the rockfill caused by the counterweight is read by leveling, thereby achieving efficient in-situ measurement of the elastic modulus of dam rockfill, providing reliable support for deformation calculation of high rockfill dams.

This invention discloses a method and equipment for synchronous acquisition of multi-source data on the surface of rockfill dams, belonging to the field of intelligent construction and quality control of water conservancy projects. The acquisition method uses a GNSS positioning system to obtain the velocity vector and real-time position coordinates of the acquisition equipment and converts these coordinates into rockfill dam engineering coordinates. Based on the velocity vector, the operating status of the acquisition equipment is determined. Image data of the rockfill material surface and data of the rockfill dam compacted layer are acquired, and dynamic survey line units are divided. Then, the image data of the rockfill material surface and the data of the rockfill dam compacted layer are processed for data time synchronization to generate a structured multimodal dataset. This invention is applicable to the quality inspection of rockfill dam construction, effectively overcoming the problem of heterogeneous data registration in rockfill dam quality inspection, and generating a structured multimodal dataset containing surface and internal quality features, providing reliable data support for the digital control and intelligent evaluation of rockfill dam construction quality.

The invention belongs to the technical field of carbon coating equipment, and particularly relates to a vertical shaft type water inlet / outlet foundation structure of a hydropower station and a construction method thereof. The vertical shaft type water inlet / outlet foundation structure of the hydropower station comprises a half-digging and half-filling type reservoir bottom, a vertical shaft type water inlet / outlet and a concrete foundation structure area. Wherein the half-digging and half-filling type reservoir bottom comprises a digging area reservoir bottom and a filling area reservoir bottom, the digging area reservoir bottom is formed by digging out redundant parts of a mountain body, and the filling area reservoir bottom is formed by backfilling reservoir bottom rockfill materials; the vertical shaft type water inlet / outlet extends downwards from the reservoir bottom and is connected with the diversion tunnel; the concrete foundation structure area is arranged between the vertical shaft type water inlet / outlet and the reservoir bottom filling area.

A triaxial test method for simulating the cyclic cumulative deformation of dam rockfill under reciprocating impoundment, belonging to the technical field of cyclic triaxial test method, the steps are: first, carry out rheological test under stress state of full impoundment; second, after the rheological test, continue to carry out triaxial cyclic test under water cycle load; third, repeat the first two steps to determine the frequency threshold; fourth, carry out rheological test under stress state from full impoundment to the lowest water level; fifth, carry out triaxial cyclic test under consolidation standard; sixth, remove rheological deformation to obtain the cyclic cumulative deformation of rockfill under water cycle load. The test consolidation standard, loading frequency threshold and rheological deformation separation method are proposed, which can significantly reduce the test deviation caused by rate effect and rheological effect, improve the accuracy of long-term deformation simulation of rockfill, shorten the test time and greatly improve the test efficiency.

The embodiment of the present application provides a method for determining the density related parameters of earth and rockfill dam rockfill by using the additional mass method. The method calibrates the established rockfill density detection simulation model by using the results of indoor small-scale physical model test; carries out simulation test on the rockfill to be detected by using the calibrated simulation model, substitutes the obtained vibration main frequency of the rockfill to be detected under different additional masses into the relationship between the fitted vibration mass and the vibration main frequency respectively, obtains the vibration mass of the rockfill to be detected under different additional masses, and then combines the vibration mass and the vibration volume of the rockfill to be detected under different additional masses to calculate the density of the rockfill to be detected under different additional masses. Since the vibration mass and the vibration main frequency used for fitting the relationship change with the change of the additional mass, the present application can detect the rockfill density with high precision under the conditions that the rockfill is impacted by different additional masses, the vibration stiffness and the vibration mass of the rockfill at the detection position change.

The application discloses a kind of rockfill material field maximum dry density determination method and related device considering similar gradation scale effect.The method first obtains field original gradation, determines field maximum particle size, indoor allowable maximum particle size and original over-diameter particle content P1;Similar scale multiple n is set to construct similar gradation curve, and the over-diameter content P2 after scaling is counted;According to whether P2 is greater than 30%, the equivalent coarse particle content P is determined in segments: when P2≤ 30%, P=P2 is taken, when P2> 30%, P=P1 / n is taken;Finally, the maximum dry density obtained by indoor compaction test is converted into field maximum dry density by density conversion formula.The size effect is quantitatively corrected by introducing scale multiple n, the system deviation of indoor test density "virtual height" is eliminated, the calculation precision of rockfill material field maximum dry density is significantly improved, and is suitable for two kinds of scale process of pure similar gradation method and mixed method.

The invention discloses a constitutive model building method for predicting mechanical characteristics of cyclic loading and unloading of rockfill materials, which comprises the following steps: on the basis of an elastic-plastic matrix of a generalized plastic model, introducing a function related to the number of cycles to describe the change of the elastic-plastic matrix along with the number of cycles; and the prediction capability of the loading and unloading modulus improvement model on the cyclic loading and unloading characteristics of the rockfill material under different confining pressure and stress levels is improved, and a new GPWHU constitutive model is formed. By adopting the technical scheme provided by the invention, the mechanical response of the rockfill material under cyclic loading and unloading can be accurately predicted.

The invention provides a triaxial active confining pressure Hopkinson test device for rockfill materials, the triaxial active confining pressure Hopkinson test device comprises a base, a confining pressure sealing assembly and a pressure loading assembly, a housing is arranged on the base, and a mounting cavity is arranged in the housing; the confining pressure sealing assembly comprises an annular cabin body, a replaceable bushing and two loading pressure heads, the annular cabin body is arranged in the mounting cavity, an opening is formed in the inner side wall of the annular cabin body, the replaceable bushing is detachably mounted at the opening, and the annular cabin body and the replaceable bushing define a confining pressure cavity; the two loading pressure heads are respectively plugged at the two ends of the replaceable bushing to define an accommodating cavity, the accommodating cavity is used for filling a rockfill material sample, and the outer end surfaces of the loading pressure heads are flush with the axial end surface of the annular cabin body; an incident bar and a transmission bar in the stress loading assembly are respectively propped against the two loading pressure heads so as to apply preset loading force to the loading pressure heads and the rockfill material sample. According to the invention, the loading force can be accurately transmitted to the rockfill material sample, and the test precision can be improved.

The invention belongs to the field of geotechnical engineering mechanics, and relates to a method for constructing the crushing strength of rock particles and the internal virtual crack length of the rock particles. According to the method, the weakest chain theory and the intensity distribution inversion technology are fused, and the goal of deducing geometric and spatial statistical characteristics of micro cracks in particles from macroscopic particle intensity test data is achieved, so that a construction method for establishing a rock particle intensity distribution model and internal virtual crack distribution is established. According to the method, on the basis of particle strength test data, an optimal statistical model of particle strength is researched, and on the basis of fracture mechanics and the weakest chain strength theory, the length, direction and spatial distribution characteristics of internal cracks of particles are obtained through inversion. The method can be applied to fundamental researches such as rockfill material discrete element numerical simulation, rock sample microscopic damage evolution analysis and granular mixture particle breakage prediction, and a foundation is laid for constructing a constitutive model of breakable granular materials such as rockfill materials.

The invention discloses a rockfill material filling quality multi-mode intelligent detection method, and belongs to the technical field of civil engineering filling quality detection. According to the method, aiming at the problems that traditional rockfill material grading detection is low in efficiency and insufficient in precision, high-resolution color images, three-dimensional point clouds and near-infrared data of the surface of a rockfill material are synchronously collected through multiple sensors, and multi-source data alignment is achieved through space-time registration; carrying out feature layer deep fusion by adopting an attention-guided multi-mode fusion network to generate a fusion feature map; an adaptive network based on neural architecture search automatically selects an optimal path to realize particle segmentation; reconstructing a particle three-dimensional model by using multi-view geometric constraints and minimizing energy functions of a fusion data item, a smooth item and a luminosity item; and finally, extracting grain composition characteristics to realize quality evaluation. The method is mainly used for rapidly and accurately detecting the filling quality of rockfill materials such as water conservancy projects and highway roadbeds.

The utility model discloses a stockpiling field rockfill material weathering influence comprehensive simulation experiment device, the device is provided with an atomization spraying mechanism, a sample placing chamber, a screening chamber and a drainage chamber in sequence from top to bottom, the atomization spraying mechanism is connected with the sample placing chamber, the sample placing chamber is communicated with the screening chamber, the screening chamber is communicated with the drainage chamber, a first screening barrel is arranged in the sample placing chamber, and a second screening barrel is arranged in the drainage chamber. A second screening barrel, a third screening barrel and a fourth screening barrel are arranged in the screening chamber, and a first screen, a second screen, a third screen and a fourth screen which are respectively arranged in the screening chamber and are sequentially reduced in mesh aperture are arranged in the screening chamber, and the measuring mechanism is respectively connected with the sample placing chamber, the screening chamber, the drainage chamber and the atomization spraying mechanism. According to the utility model, the sampling chamber and the screening chamber are separately arranged and are matched with the atomizing and spraying mechanism and the heating mechanism, so that the grading, particle size, permeability coefficient, quality and settlement change rules of the rockfill material in different weathering processes can be obtained, and reference can be provided for the selection of the compaction mode, crushing particle size and water and soil protection measures of the rockfill material before construction according to the change rules.

The invention discloses an identification method for interlayer type weathering of a metamorphic sandstone stock ground, and belongs to the technical field of rock-fill dam material preparation processes. The invention provides the identification method for the interlayer type weathering of the metamorphic sandstone stock ground, which can effectively identify the interlayer type weathering condition of the metamorphic sandstone. The method comprises the following steps: firstly, carrying out lithology and spatial distribution exploration on a metamorphic sandstone stock ground, then analyzing and judging whether interlayer type weathering exists in the metamorphic sandstone stock ground through regional geologic causes, and when the interlayer type weathering exists, introducing a saturated uniaxial compressive strength statistical analysis tool to carry out secondary judgment. When it is judged that the interlayer type weathering condition exists in the metamorphic sandstone stock ground again, a pre-rolling test is conducted on rockfill materials mined in the metamorphic sandstone stock ground through the pre-rolling test technology, final judgment is conducted, and finally the blasting mining mode is determined according to the final judgment conclusion and the characteristics of the interlayer type weathering sandstone stock ground. Therefore, the dam material which meets the required characteristics and is good in gradation is obtained.

A triaxial test method for simulating cyclic accumulative deformation of a damming rockfill material under the action of reciprocating water storage belongs to the technical field of cyclic triaxial test methods, and comprises the following steps: step 1, carrying out a rheological test in a full storage state stress state; 2, after the rheological test is finished, continuing to carry out a triaxial cycle test under the action of water cycle load; 3, repeating the previous two steps, and determining a frequency threshold value; 4, carrying out a rheological test from a full storage state to a water level lowest stress state; 5, carrying out a triaxial cycle test under the consolidation standard; sixthly, rheological deformation is removed, and rockfill material circulation accumulated deformation under the water circulation load effect is obtained. The test consolidation standard, the loading frequency threshold and the rheological deformation separation method are provided, the test deviation caused by the rate effect and the rheological effect can be remarkably reduced, the accuracy of rockfill material long-term deformation simulation is improved, the test time consumption is shortened, and the test efficiency is greatly improved.

This application provides a method for the continuous, layered construction of ultra-thick rockfill concrete gravity dams in confined spaces, comprising the following steps: cleaning, roughening, washing, and seepage prevention treatment of the dam foundation; erecting prefabricated cantilever formwork in sections along the dam axis to form construction sites; layering rockfill materials onto the construction site to form rockfill layers, with several protruding stones reserved on the surface of the rockfill layers as anchoring structures for interlayer bonding; injecting self-compacting concrete into the voids of the rockfill layers to form rockfill concrete layers; and repeating the aforementioned steps after the rockfill concrete layers reach a state capable of bearing the preset construction load, i.e., successively forming the next level of rockfill layers and rockfill concrete layers, repeating this process until the construction of the gravity dam is completed. The method for the continuous, layered construction of ultra-thick rockfill concrete gravity dams in confined spaces provided by this application eliminates the need for large trestle bridges and achieves continuous construction, making it suitable for rockfill concrete gravity dam construction operations in confined spaces.

The invention belongs to the field of geotechnical engineering mechanics, and relates to a rock particle strength probability distribution calculation method considering a strain rate effect. After Wenchuan earthquake, it is found that the section of the dam body of the terrace concrete faced rockfill dam shrinks inwards, and analysis considers that particles are broken due to shear shrinkage of rockfill materials in the earthquake. Therefore, in order to research the deformation mechanism and constitutive relation of rockfill materials under the earthquake action, the dynamic crushing strength of rockfill particles needs to be known firstly. Tests show that the strength of rockfill particles with the same rock quality and similar particle sizes has high discreteness, which reflects the inconsistency of internal defects of the particles. In addition, wide grading of damming rockfill is achieved, and the particle size of the damming rockfill is generally 0.5-800 mm. Obviously, the rockfill particles with the large particle size span and inconsistent internal defects have the large size effect, namely the large particles are low in strength, and the small particles are high in strength. Under the earthquake condition, the strength of the rock can be increased along with the increase of the strain rate, and rockfill particles are not added, namely, the strain rate effect exists. On the basis of a particle strength test, the advantage that Log-Logistic distribution is suitable for strength statistical characterization is combined with a rock strength dynamic improvement coefficient, a probability distribution function of the particle crushing strength under a dynamic strain rate corresponding to an earthquake working condition is deduced, and according to a particle crushing test result of a five-level particle size under a four-level loading rate, the probability distribution function of the particle crushing strength under a four-level loading rate is calculated. Model parameters are determined. Finally, the effectiveness and applicability of the method are verified, and reasonable description of the probability distribution characteristics of the static and dynamic strength of the rockfill particles is realized. And a foundation is laid for researching a rockfill material earthquake deformation mechanism and a constitutive relation by a discrete element method.

The application discloses a kind of panel dam model structures and design methods for dam-break test, the upstream slope of the rockfill area is paved with the transition layer of uniform thickness, the transition layer is paved with continuous graded sand, and the maximum particle size of the continuous graded sand is less than the minimum particle size of the rockfill material;The slope of the transition layer is paved with the cushion layer of uniform thickness, the cushion layer is paved with fine material with smaller particle size and continuous grading than the sand of the transition layer, and the slope of the cushion layer is paved with the panel layer of uniform thickness, the panel layer is spliced by multiple bamboo-rib panels, there are vertical expansion joints from the dam top to the dam bottom between adjacent bamboo-rib panels, the main material of the bamboo-rib panel is gypsum, and the bamboo-rib panel is internally provided with a bamboo-rib framework.The panel dam model structure disclosed by the application has regular fracture shape in the centrifugal test for simulating dam-break, can be used for technical analysis, and can improve the success rate and accuracy of the panel dam dam-break model test.

The utility model discloses a kind of rockfill material screening devices, it relates to stone processing technical field, it includes screening box, the upper side and middle part in screening box are all provided with a row of screening rods, the front end bottom side of two rows of screening rods is all provided with positioning rod.This kind of rockfill material screening device, by the two rows of screening rods of setting distribution, the gap between screening rod can be used to rockfill material screening, and the screening gap formed by the parallel arrangement between screening rod will not cause the blockage of rockfill material, while the spring set in mounting groove in the rear side of screening rod, after rockfill material falls on screening rod, the up and down deviation between multiple screening rods can be made, further avoid rockfill material to be stuck between adjacent screening rods, effectively improve the screening efficiency of rockfill material.