155 results about "Wet dry cycle" patented technology

The invention relates to an iron tower foundation safety analysis method considering the dry-wet cycle effect. The method comprises the following steps that 1, a soil body strength degradation constitutive model is established; 2, determining iron tower foundation structure parameters and soil body parameters; 3, establishing an iron tower foundation-soil body three-dimensional geometric model by utilizing three-dimensional modeling software and rock-soil finite element simulation software; 4, applying a load transmitted to the iron tower foundation by the power transmission iron tower in the iron tower foundation-soil body three-dimensional geometric model, defining initial parameters, and establishing a rainwater seepage and dry-wet cycle coupling effect analysis model; 5, analyzing and predicting the cycle index when the safety coefficient of the iron tower foundation is reduced to a threshold value from the two aspects of tower foundation ultimate bearing performance and iron tower foundation-soil body interaction on the basis of a rainwater seepage and dry-wet cycle coupling effect analysis model; according to the method, an efficient and accurate numerical analysis means can be provided for safety assessment of the power transmission tower foundation in the collapsible loess area.

The invention discloses a structural plane ring shear creep test method under real-time water pressure rise and fall and dry-wet cycle action, which comprises the following steps: S1, applying shear stress step by step to a preset peak strength ratio by adopting a constant normal stress and shear stress graded loading mode; s2, under the working condition of loading each stage of shear stress, performing dry-wet cycle and / or water pressure rising and falling cycle operation synchronously; s3, based on test data, analyzing creep deformation characteristics, long-term strength and failure rules of the structural plane; the device synchronously simulates reservoir water level rising and falling and dry-wet circulation in a ring shear creep test, and can be applied to long-term stability prediction and control measure optimization design of reservoir bank rock slopes and other rock shear tests needing to simulate water pressure change and dry-wet circulation conditions.

The invention provides a water bank slope structural surface rock mass shear creep test system and method under a dry-wet cycle, relates to the technical field of rock mechanical property test, and aims to accurately reproduce a dry-wet cycle-stress coupling working condition of a rock mass structural surface under a complex environment. In the device, the direct shear apparatus comprises a loading frame and a loading and sliding device mounted on the frame, and provides a stable mechanical loading basis for a test; the shear box is used for accommodating a rock sample containing a structural surface, and the lower shear box adopts a lengthened design, so that the shear area in the whole shear process can be ensured to be constant; the dry-wet cycle environment simulation cabin is fixed in the loading frame, hermetically wraps the shear box and is integrated with a water soaking subsystem and a drying subsystem, the water soaking subsystem can adjust the water level height and water pressure in the simulation cabin, and the drying subsystem can dry a rock sample, can reproduce the sun illumination radiation condition and is matched with the water soaking subsystem to realize periodic dry-wet cycle; and the coupling effect of dry-wet cycle and mechanical loading is realized.

The invention discloses a soil solidification effect detection and analysis system and method, and relates to the field of soil solidification effect detection.The soil solidification effect detection and analysis method comprises the steps that based on the sedimentation characteristics of a solidification material, soil is divided into a bottom sedimentation sudden change zone, a middle sedimentation gradual change zone and a top sedimentation stable zone in the depth direction, and the minimum operation thickness of a sampling tool serves as the reference layer thickness; dividing non-equidistant sampling layers according to different multiples in each settlement zone to intercept columnar soil samples; performing an initial dynamic load test on the original soil sample, then performing circulating saturated water drying treatment on the same soil sample, and applying the completely same dynamic load mode again; a water circulation effect in a natural environment is simulated by performing vacuum water saturation and constant-temperature drying circulation treatment on a soil sample for multiple times and combining a dynamic load test after water damage. Through non-equal-interval stratified sampling and multi-round dry-wet cycle testing, stratified dynamic and high-precision quantitative evaluation of the water damage resistance of soil solidification is achieved.

The invention relates to the technical field of concrete durability evaluation, in particular to a compound green concrete salt freezing resistance durability evaluation system under a frozen soil environment, which comprises a data input unit, a decision information table storage unit, a rough set analysis processing unit and an evaluation output unit, the data input unit receives a sample data set containing freeze-thaw cycle times, dry-wet cycle times, freeze-thaw-dry-wet cycle times, long-term soaking time, composite salt concentration, gas content and fly ash mixing amount, and the decision information table storage unit stores a decision information table constructed based on a rough set theory. The influence factor combination and the relative dynamic elastic modulus percentage are associated, the rough set analysis processing unit establishes a mapping relation through attribute reduction and rule extraction and quantifies the weight of each factor, and the evaluation output unit outputs a relative dynamic elastic modulus predicted value, durability grade classification and key factor contribution sorting. And the salt freezing resistance durability of the concrete under the multi-factor coupling effect is accurately evaluated.

The utility model relates to the technical field of water and soil conservation, and particularly discloses an ecological slope protection water and soil conservation device. Comprising grating blocks arranged on the surface of a soil layer of the ecological slope protection, the adjacent grating blocks are connected through mortise and tenon joint structures, and a plant protection area is formed in a central grating groove of each grating block; and the separating and positioning assembly is arranged in the soil layer on the lower side of the grating block, vertically penetrates through the slope protection floating soil layer and extends to the bearing layer. Through the arrangement of the grating blocks, the adjacent grating blocks are spliced through mortise and tenon joint structures, and an integral protective layer is formed on the surface soil layer of the ecological slope protection. And through the arrangement of the separating and positioning assemblies, the lower soil body can be divided into independent units, and the independent units are matched with the upper grating blocks to form a three-dimensional water and soil conservation frame, so that the overall stability of the slope protection is enhanced, and local water and soil loss and diffusion are prevented. The problems that a traditional slope protection structure is poor in synergistic protection effect and continuous water and soil conservation function, and interlayer slippage is likely to be generated under the long-term dry-wet cycle effect are solved.

The invention discloses a multi-scale research method for soil body strength degradation under the dry-wet cycle effect. The multi-scale research method comprises the following steps: S1, preparing a sample from collected test soil under the dry-wet cycle effect; s2, testing the macroscopic shear strength of the soil body by using the triaxial sample prepared in the step S1; s3, the cutting ring sample prepared in the step S1 is used for soil microcosmic fracture testing; s4, carrying out a soil body micro-pore test by utilizing the microstructure sample prepared in the step S1; and S5, analyzing the soil body strength degradation rule of the collected test soil under the dry-wet cycle action by using the test results of the soil body macroscopic shear strength test, the soil body microcosmic crack test and the soil body microcosmic pore test. According to the method, through multi-scale analysis, related enterprises can more comprehensively evaluate the degradation rule of the soil body under the dry-wet cycle effect, so that an engineering construction design scheme is optimized, and the risks of landslide, collapse and other engineering accidents caused by soil body strength reduction are reduced.

The invention provides a dangerous rock degradation and collapse simulation test system and method under a multi-field coupling effect, and the system comprises a flexible stress loading device which provides a vertical stress for a dangerous rock mass sample to enable the sample to have the same stress level as a natural state; a dangerous rock mass sample is used for simulating various collapse modes by controlling the angle of a soft belt and a hollowed-out area; the corrosion device is used for providing a dry-wet cycle and osmotic pressure environment for the dangerous rock mass sample; the data acquisition device is used for recording surface displacement, acoustic characteristics and external factors of the rock mass along the soft zone; the damage degree calculation device is used for calculating the damage degree of the dangerous rock mass under multi-field coupling; the safety coefficient calculation device is used for obtaining the safety coefficient of the dangerous rock mass under multi-field coupling; and the safety evaluation device is used for constructing an evaluation model and evaluating the safety state of the dangerous rock mass. According to the method, collapse simulation caused by degradation of the soft belt under the multi-field coupling effect is achieved, and the problems of early-stage safety evaluation and graded early warning of dangerous rock instability based on multi-index fusion are solved.

The invention provides a loess foundation dry-wet cycle settlement dynamic monitoring device and a using method thereof, and relates to the technical field of foundation settlement monitoring. The loess foundation dry-wet cycle settlement dynamic monitoring device comprises a first datum point, a liquid spraying assembly and a mounting base; the number of the first datum points and the number of the second datum points are both two, the two first datum points and the two second datum points are both fixed to the detected ground, and the two second datum points are located on the rear sides of the two first datum points. The mounting base and the liquid spraying assembly are both mounted on the ground, the liquid spraying assembly is composed of a mounting base, a mounting block, a liquid spraying pipe and an electric cylinder, the mounting base is fixed to the ground, the mounting block is slidably arranged on the mounting base, and the liquid spraying pipe is fixed to the right end face of the mounting block. According to the device, the two first datum points and the two second datum points are arranged and matched with the liquid spraying assembly, soil around the second datum points can be accurately wetted, foundation dry-wet cycle settlement monitoring is achieved, the monitoring range is effectively expanded, and a foundation is provided for comprehensively mastering the foundation settlement condition.

The invention relates to a bridge sling dry-wet cycle accelerated corrosion test device and test method under the stretch-bending coupling effect in the technical field of bridge component testing. The device comprises a sealing box, a support is arranged in the sealing box, baffles are arranged on the two sides of the support, a plurality of spray heads are arranged on the support, and the spray heads are connected with a corrosive liquid box through a pipeline and a conveying pump; a plurality of bent pipelines for placing bridge sling test pieces are arranged in the sealing box, a plurality of through holes are circumferentially formed in the middle of each bent pipeline to communicate the inside and the outside of the bent pipeline, and connecting plates at two ends of each bent pipeline are fixed on baffles; when the bridge sling test piece is placed in the bent pipeline, one end of the bridge sling test piece is relatively fixed with the baffle through the fixing piece, and the other end is connected with the tension stretching mechanism. According to the device, the corrosion working condition of the bridge sling under the stretch-bend coupling action is simulated through an artificial accelerated corrosion test, so that the corrosion resistance of a bridge sling test piece is more comprehensively evaluated, and the device has important practical application value.

The invention relates to the technical field of high polymer materials, in particular to a single-component polyurethane grouting reinforcement material as well as a preparation method and application thereof. According to the reinforcement material, polymethylene polyphenyl polyisocyanate, epoxy resin, low-functionality polyether polyol, high-functionality polyether polyol and polyester polyol are mainly used as raw materials, the adding proportion of all the raw materials is adjusted in a targeted mode, and the prepared single-component polyurethane grouting reinforcement material permeates into a permafrost region roadbed structure; the permeable material-soil stone body formed by chemical reaction with roadbed moisture has the properties of high strength and toughness, good freeze-thaw resistance, good dry-wet cycle property and low heat release. According to the formula system, the contradiction between high strength and low heat release in the traditional technology is successfully solved through the fine matching and synergistic effect of all the components, and an unexpected technical effect is achieved.

The utility model provides a pre-stressed anchor cable axial force loss and anchoring force deterioration test device under dry-wet cycle, which comprises a test water tank for accommodating a standard rock mass test block; the water injection and drainage device is arranged on the test water tank and used for controlling water level change in the water tank; the anchoring structure is composed of an anchor cable implanted into a preset hole channel of the rock mass test block and a grouting body poured between the preset hole channel and the anchor cable; the strain gauges are arranged at intervals in the axial direction of the anchoring section of the anchor cable; the pressure gauge is sleeved on the anchor cable; the plurality of hygrometers are buried in the grouting body; the strain gauges, the hygrometer and the pressure meter are connected with the data acquisition instrument through cables; and the heating assembly is arranged in the rock mass test block and the test water tank and is used for simulating a temperature change environment. According to the invention, the simulation of the dry-wet cycle working environment of the rock mass test block is realized, the drying process of the rock mass test block is accelerated through the heating assembly, the test time consumption is shortened, meanwhile, the hygrometer is matched to accurately control the dry-wet index of the test sample, and the accurate and controllable test variable is realized.

The invention discloses a chitin-silicon-calcium-based modified material for rammed earth wall repair and a weather resistance evaluation method thereof, and belongs to the technical field of rammed earth wall repair, the chitin-silicon-calcium-based modified material comprises metakaolin, calcium oxide, quartz and chitin; the ratio of chitin to metakaolin to calcium oxide to quartz is 1: 1: 2: 4; the method comprises the following steps: pre-treating at the earlier stage of a test, evaluating freeze-thaw cycle performance, evaluating dry-wet cycle performance, evaluating salt corrosion resistance, analyzing association between a microstructure and a strength performance, and finally, revealing a material degradation rule and mechanism by combining scanning electron microscope observation, unconfined compressive strength test and crack rate analysis. When the freezing and thawing cycle number N is less than or equal to 5, the dry and wet cycle number I is less than or equal to 9, and the salt solution concentration c is less than or equal to 0.3 mol / L, the characteristics of freezing and thawing resistance, dry and wet resistance, salt erosion resistance and the like of the modified material are obviously improved; after the modified material is added, internal pores of plain soil can be filled, unconfined compressive strength of a soil body is enhanced, and long-term durability of the soil body is improved.

The invention relates to an unsaturated soil pile foundation bearing characteristic model test device and method under a dry-wet cycle, and the device comprises a model box which is filled with model soil; the dry-wet circulation system comprises a drying system and a humidifying system, the drying system and the humidifying system are used for controlling drying and humidifying of the model soil respectively and used for simulating multiple dry-wet circulation working conditions, and at least one of dry-wet circulation paths, dry-wet circulation duration and dry-wet circulation times of any two dry-wet circulation working conditions is different; the model pile is inserted into the model soil; the loading device is fixed through a test reaction frame and is used for providing a vertical load for the pile sinking penetration and static load test of the model pile; and the data acquisition system comprises multiple types of sensors, and each sensor is arranged in the model soil or on the model pile. Compared with the prior art, the device can directly simulate the influence of the dry-wet cycle effect on the pile sinking, bearing and deformation characteristics of the pile foundation in the unsaturated soil in actual engineering, and is suitable for a large-scale model test with a relatively large soil layer thickness.

The invention discloses a method and equipment for weathering and digesting gravel based on dry-wet circulation, and belongs to the technical field of degraded sand field planting and ecological remediation, the equipment comprises a mounting seat, a liquid storage tank is mounted at the top of the mounting seat, the liquid storage tank is communicated with an equipment box through a pipeline, a pump body is arranged in the equipment box, and the pump body is communicated with a plurality of liquid outlets through pipelines; and the liquid outlet is communicated with a nozzle main body. According to the device, through the designed driving mechanism, an output shaft of a driving motor rotates to drive a driving gear to rotate, the driving gear rotates to drive a driven gear to rotate, the driven gear can drive a bottom equipment box to rotate through a shaft body, and a first electric push rod can drive a moving ring to move when working and extending; the movable ring moves to drive the range adjusting mechanism on the peripheral side to move, the radial spraying range of the range adjusting mechanism and the nozzle body can be controlled, the equipment can achieve accurate spraying control over dry-wet circulation according to different soil and climate conditions, and the spraying treatment effect is improved.

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

The application discloses a kind of equipment for studying the stability of MICP mineralization product under dry-wet-freeze-thaw cycle, comprising: soil column test unit, refrigeration cycle system, heating cycle system, temperature monitoring system and water injection unit;Soil column test unit includes temperature guide plate, soil column sample cylinder, heat preservation layer and water permeable plate;Refrigeration cycle system includes refrigeration device, cooling liquid inlet pipe and cooling liquid outlet pipe;Heating cycle system includes heating device, hot liquid inlet pipe and hot liquid outlet pipe;Temperature monitoring system includes temperature sensor and data acquisition equipment;Water injection unit includes water storage tank and peristaltic pump;Soil column sample cylinder is also provided with water outlet for discharging water in soil column sample cylinder.The equipment can simulate the dry-wet and freeze-thaw cycle environment of soil column sample, obtain the stability parameters of soil column sample under the action of dry-wet cycle and freeze-thaw cycle alone or coupling, and evaluate the stability effect of MICP technology in repairing heavy metal pollution, providing theoretical and practical basis.

The invention belongs to the field of inorganic mineral functional materials, and provides a pH-responsive tannic acid / attapulgite composite microsphere and a preparation method thereof. According to the preparation method, the design that epoxy silane grafted attapulgite and tannic acid are subjected to ring opening on epoxy groups through phenolic hydroxyl groups to form C-O-C covalent bond anchoring is adopted, and then spray drying and balling are performed to prepare the composite microspheres, so that low-viscosity atomized processing, controllable particle size balling and excellent mechanical stability and dry-wet cycle stability under the high-solid-content feeding condition are realized; the prepared inorganic mineral-polyphenol composite particles have high processability and mechanical stability and pH response water absorption performance, the problems that traditional inorganic mineral-polyphenol composite particles are difficult to give consideration to coupling contradiction between processability and mechanical stability and performance consistency is insufficient during metal coordination treatment are solved, and the inorganic mineral-polyphenol composite particles have wide application value in the fields of intelligent adsorption materials, environment response type functional fillers and the like.

This invention discloses a flexible wall device and method for measuring the gas permeability and diffusion coefficients of unsaturated soil. It mainly consists of a gas washing device, a confining pressure-volume change system, a wet-dry cycle control system, and a gas measuring device. The wet-dry cycle control system includes a humidity controller and valves. The gas measuring device includes a top cover, a cylindrical wall, a base, an upper cavity, and a lower cavity. The top cover, cylindrical wall, and base are connected by bolts and nuts. The base outlet is connected to the gas washing device, a gas supply device, the wet-dry cycle control system, and the gas measuring device. From bottom to top, the lower cavity, the sample, the upper cavity, and the control rod are arranged between the base and the top cover. This device offers high precision, overcoming the measurement errors of gas permeability and diffusion coefficients caused by the sidewall dominant flow in rigid wall permeameters. It can measure the gas permeability, diffusion coefficient, and volume change of samples under wet-dry cycles and different stress conditions, providing a reliable measurement tool and method for assessing gas migration in unsaturated soil.

The invention discloses a test device for simulating long-term durability of a grouting material under the action of a complex coupling environment, the device comprises a test box body, a steel spring plate, a ventilation system and a water circulation system, the test box body comprises a box body, a box cover, an observation window and a pedestal; the ventilation system comprises an air inlet, an air outlet, a hot air pump and a ventilation pipe; the water circulation system comprises an upper water injection port, a lower water outlet, an impermeability test water injection port, a hydraulic pump, a hydraulic pressure gauge and a water pipe. The device can simulate that the grouting material is in a complex environmental condition of dry-wet cycle, load (one-way or two-way), hydrostatic pressure and coupling effect of three factors, and can also be used for an anti-permeability test, a corrosion resistance test and a dynamic water test of a cubic grouting material test block. By assembling common materials and equipment, the effect of simulating the actual occurrence condition after the grouting material is solidified is achieved, and the device is suitable for simulating the situation of long-term action of loads and complex environmental conditions, and is particularly suitable for long-period durability tests with monthly and annual as time units.

The application discloses a kind of wet and hot marine environment under power transmission equipment surface condensation amount calculation method and device, it is related to power transmission equipment humidity management technical field, wherein method includes: obtaining the temperature and relative humidity parameters of the environment where target power transmission equipment is located, into salt moisture dissociation corrected condensation generation condition criterion, whether to meet condensation generation condition is judged, not meet then terminate calculation, meet then enter subsequent process;Based on salt moisture dissociation effect, through the surface tension of salt solution and equivalent curvature radius double correction, construct condensation amount calculation equation, enter environmental parameter and obtain the condensation amount of moisture dissociation correction after solution;Combining the salt density deposition amount and contact angle change caused by wet and hot marine environment dry-wet alternation, based on the salt space redistribution characteristics complete salt density dynamic correction, into parameter calculation dry-wet cycle condensation amount, realize the quantification of equipment surface condensation amount.The application realizes the accurate calculation of condensation amount, while guaranteeing long-term service of marine power transmission equipment.

The invention provides a strongly-weathered red layer soft rock dry-wet cycle testing device and method for monitoring quality change, and belongs to the field of rock mechanics. The test method comprises the following steps: putting a sample into a saturator, hanging the saturator in a vacuum pot, pumping the vacuum pot to a vacuum state through a suction filtration pump, pressing deionized water into the vacuum pot through atmospheric pressure, continuously performing suction filtration until the vacuum pot reaches a relatively vacuum state, and keeping the state for 12-24 hours, and meanwhile, when the state is reached, the mass sensor is used for testing, and measured data is transmitted to a computer in real time. The experimental device and method are easy and convenient to operate, economical and efficient, and can effectively solve the problem that a mechanical experiment cannot be carried out to obtain related mechanical parameters due to the fact that a sample is damaged after a strongly-weathered red layer soft rock dry-wet cycle experiment; meanwhile, the problem that the permeation water absorption capacity of the sample cannot be specifically quantified in the long-time water absorption process is solved by monitoring the quality of the sample in real time.

The invention relates to construction and application of a model for predicting the strength and corrosion resistance coefficient of coal gangue concrete under sulfate erosion based on multi-factor fusion, and aims to solve the problems that the deterioration rule of the coal gangue concrete is complicated and the precision of a traditional prediction model is insufficient due to multi-factor nonlinear coupling in a sulfate erosion environment. The method comprises the following steps: (1) constructing a multi-source database containing test data and literature data, wherein the multi-source database contains six types of input characteristics including water-binder ratio, dry-wet cycle age and the like; (2) developing a particle swarm optimization support vector machine (PSO-SVM) model, and quantifying feature importance in combination with an SHAP value analysis method; and (3) establishing a high-precision prediction model, and outputting a compression / breaking strength corrosion resistance coefficient. The method has the remarkable technical effects that the Rvalue of a PSO-SVM model test set reaches 0.912 (compression resistance) and 0.981 (fracture resistance), and the error is smaller than or equal to 20%; it is revealed that the dry-wet cycle age is a key negative influence factor, coal gangue substitution rate optimization design is guided (for example, the fine aggregate substitution rate is controlled to be larger than 20%, and the coarse aggregate substitution rate is controlled to be smaller than 50%), and a reliable tool is provided for concrete durability design in the sulfate erosion environment.

The invention discloses a reservoir area rock slope model test device and method, and relates to the field of slope model tests. The wave making module, the dry-wet cycle module and the water level control module are arranged in the rock slope model, the dry-wet cycle effect and the reservoir area wave erosion effect caused by water level change can be truly simulated, and the mechanical response and deformation conditions of rock slope rock mass in the reservoir area in the water level dynamic change process are truly reflected; according to the non-intrusive continuous testing device and method, the evolution process of dry-wet cycle and erosion coupling effect reservoir area rock slope slippage can be studied by simulating water level changes, slope rock mass dry-wet cycle and wave erosion; according to the invention, the complex and changeable water level change condition in the reservoir area rock slope can be accurately simulated, the coupling effect of erosion and dry-wet cycle is considered, and automatic control is realized to a certain extent.

The utility model provides a microwave drying type rock-soil body sample dry-wet cycle device. The microwave drying type rock-soil body sample dry-wet cycle device comprises a sealed box body and a microwave drying device, wherein the interior of the sealed box body is used for placing a rock sample; the mass measuring unit is arranged in the sealing box body and is used for measuring the mass of the rock sample; and the water storage unit is arranged on one side of the sealed box body. When the microwave drying type rock-soil body sample dry-wet cycle device provided by the scheme is used for testing a rock-soil body, the saturation and drying processes of the sample are integrated, the operation steps of the test are reduced, the waste of time is reduced, the drying condition of the sample can be monitored through a mass sensor, the test efficiency is improved, meanwhile, the rock-soil body is dried through a microwave generator, and the test efficiency is improved. The device can quickly increase the temperature of a sample to accelerate evaporation of moisture of the sample, can accelerate gas circulation through the fan, shortens the experiment time in the drying process, is economical and efficient, and can quickly cool a rock-soil body after drying is completed through the fan.

This invention discloses a soil-rock drying-wet cycle test system and method under continuous loading. The soil-rock drying-wet cycle test system under continuous loading includes a rock sample test chamber, in which rock samples are placed; a simulated precipitation system is located on the inner top of the rock sample test chamber; an electromagnetic load loading system is located inside the rock sample test chamber and on top of the rock sample to apply a moving load to the rock sample; and a ventilation and drying system is located on the side of the rock sample test chamber to ventilate and dry the rock sample. The electromagnetic load loading system includes a motion track located on top of the rock sample test chamber; an electromagnetic loading cylinder located on top of the rock sample; a lower pressure pad laid on the bottom of the rock sample; and an electromagnet located above the electromagnetic loading cylinder and within the motion track, which can reciprocate along the motion track under the drive of a magnet driving device; the end of the electromagnet near the electromagnetic loading cylinder has the same polarity as the electromagnetic loading cylinder. The system can automatically realize the drying-wet cycle, crushing, and screening of the rock sample.

The invention discloses a frozen soil tunnel support optimization control method and system based on digital twinning and reinforcement learning. The system comprises a multi-source monitoring unit, an intelligent support unit, an environment regulation and control unit, an intelligent drainage and humidity regulation unit, a digital twinborn control and prediction unit and a control and communication unit. The multi-source monitoring unit obtains multi-field information of the tunnel surrounding rock and the supporting structure; the digital twinning control and prediction unit is used for constructing a multi-physics field digital twinning model capable of being updated online, defining a comprehensive evaluation function and generating a control strategy of each partition under security constraints by adopting a reinforcement learning algorithm; the intelligent supporting unit achieves prestress self-adjustment and crack self-healing through a shape memory alloy anchor rod, a phase-change temperature-adjusting lining layer and a self-healing protection layer, and the intelligent drainage and humidity adjusting unit combines drainage, heat tracing and humidity control to reduce ice blockage and dry-wet cycle damage. The system can obviously improve the support safety of the frozen soil tunnel and reduce the operation energy consumption.

The present invention provides a prediction method and system for the uniaxial compression void ratio of rockfill aggregates considering the influence of wet-dry cycles, including: screening out multiple groups of rockfill aggregates that conform to the particle size distribution characteristics of rockfill; conducting wet-dry cycle tests under different established numbers of wet-dry cycles N; conducting uniaxial compression tests; constructing a prediction model for the uniaxial compression void ratio e of rockfill aggregates considering the influence of the number of wet-dry cycles N; and predicting the uniaxial compression void ratio e of rockfill aggregates that conform to the same particle size distribution characteristics of rockfill aggregates after experiencing different numbers of wet-dry cycles N under different axial stresses σ v . The present invention fully considers the influence of wet-dry cycles caused by the rise and fall of the reservoir water level on the deformation of rockfill, obtains data that is more consistent with the actual void ratio of rockfill, and provides a scientific and effective means for predicting the deformation of actual rockfill dams during operation under the influence of cyclic changes in the reservoir water level.

This invention discloses an ultra-long service life concrete and its preparation method, belonging to the field of building materials technology. The ultra-long service life concrete, by weight, comprises the following raw materials: 800-1000 parts of cementitious material, 1400-1600 parts of aggregate, 10.5-19 parts of admixture, 20-30 parts of toughening fiber, 0-20 parts of steel fiber, 6-11 parts of PVA fiber, and 160-200 parts of water; the toughening fiber is selected from fibers with a shrinkage rate of 4%-10% at 55-75℃. The concrete of this invention has a service life ≥120 years, a compressive strength ≥80 MPa, withstands ≥500 wet-dry cycles, exhibits excellent crack resistance, corrosion resistance, and impermeability, has widely available components, a simple process, and can be industrially produced. It is suitable for major infrastructure projects and can significantly reduce maintenance and reinforcement costs.

The invention discloses a polymer bentonite composite anti-seepage material, relating to the technical field of anti-seepage materials, comprising the following raw materials by weight: 3-5 parts of bentonite, 0.2-0.4 parts of amphoteric organic ion salt monomers, 0.1-0.2 parts of a cross-linking agent, 0.05-0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06-0.12 parts of a reactive beta-cyclodextrin quaternary ammonium salt, 0.05-0.1 parts of an alkoxy-containing monomer, 0.5-0.8 parts of volcanic ash, 0.1-0.3 parts of nanofibers, 0.05-0.08 parts of sodium tripolyphosphate, 0.005-0.01 parts of an initiator, 0.01-0.03 parts of 2,3-quinolinedicarboxylic acid, and 10-20 parts of water. The material has significant anti-seepage effect, good resistance to dry-wet cycles, good acid, alkali, and salt resistance, sufficient performance stability, and long service life.