299 results about "Freeze thawing" patented technology

The invention provides an ultrahigh bridge tower safety regulation and control method and system based on a concrete time-varying effect, and relates to the technical field of bridge tower regulation and control systems. Aiming at the problems that in the prior art, the prediction accuracy of long-term internal force redistribution caused by concrete shrinkage and creep is insufficient, the coupling effect of multiple risk factors and bridge tower concrete shrinkage and creep is insufficiently considered, so that the prediction accuracy of the state of a bridge tower is low, and a maintenance regulation and control guidance basis is lacked, multi-source heterogeneous data are fused, and the prediction accuracy of the state of the bridge tower is improved. Concrete shrinkage and creep, dynamic ice impact, static ice pressure, concrete freeze thawing and ice wedging influence indexes are calculated respectively, a comprehensive risk assessment model based on machine learning is adopted for fusion, and a comprehensive risk report containing risk levels and regulation and control suggestions is generated; according to the method, the accuracy of single risk factor assessment is remarkably improved, the comprehensive prediction precision of complex coupling risks is improved, and the decision robustness and maintenance efficiency of the system in a multi-risk concurrent complex scene are enhanced.

The invention provides a sediment concentration prediction method and system based on a freeze-thaw coupling physical constraint model, and relates to the technical field of sediment concentration prediction, and the method comprises the steps: obtaining hydrological data, meteorological data and various original data of soil and vegetation, and carrying out the preprocessing; constructing a benchmark sediment concentration physical model based on the multiple kinds of preprocessed original data, and constructing an input feature vector; inputting the input feature vector into a sediment concentration prediction ANN model, and outputting to obtain the sediment concentration; wherein in the training process of the sediment concentration prediction ANN model, reference sediment prediction and sediment mass conservation constraint of the physical model are introduced into an ANN model loss function, the loss function is enhanced by adopting a freeze-thaw weighting strategy, and the sediment concentration prediction ANN model in which the physical model and the ANN model are deeply fused is obtained. According to the invention, the stability and accuracy of prediction during extreme rainfall, runoff surge or frequent freezing and thawing are improved.

The invention discloses a triaxial acoustic emission test device and method for multi-field coupling rock microbial grouting. The triaxial acoustic emission test device comprises a core triaxial pressure chamber, a freezing and thawing temperature control system, a water pressure control system, an axial loading system, an acoustic emission detection system, a microbial grouting repair device and an assembly data acquisition and control system, the test sample temperature is controlled through the freeze-thaw temperature control system, the pore water pressure is applied through the water pressure control system, the mechanical load is applied through the axial loading system, the damage signal of the test sample is monitored in real time through the acoustic emission system, the test sample is prepared through the microorganism grouting repair device, and the assembly data acquisition and control system performs integrated control and synchronous data acquisition. The test method comprises the following steps: preparing and installing a microbial remediation rock sample, applying freeze-thaw cycle, pore water pressure and axial load in sequence or in a coupling manner, monitoring the whole process by using an acoustic emission technology, and finally comprehensively analyzing a damage evolution rule and a performance degradation mechanism of the sample under the action of multi-field coupling. The device can simulate a complex environment and evaluate the microbial grouting repair effect.

The invention discloses a method for evaluating rock mass fracture freeze-thaw fracture damage risk based on surface temperature, which comprises the following steps: S1, carrying out data acquisition on a target area based on a multi-source sensor carried by an unmanned aerial vehicle platform, and obtaining fracture geometric parameters, daily surface minimum temperature, daily surface maximum temperature, daily temperature difference and fracture moisture conditions; s2, on the basis of the geometric parameters of the crack, constructing a crack frost heaving force analytical model; obtaining a quantitative relation between the stress intensity factor and the environment temperature; s3, the I-type fracture toughness of the target rock mass is measured, and the critical crack initiation temperature of the rock mass is determined; determining the number of critical freezing and thawing cycles; s4, on the basis of the daily earth surface minimum temperature, the daily temperature difference, the fracture moisture condition and the critical crack initiation temperature, the annual accumulated effective freezing and thawing cycle number is obtained; and calculating a freeze-thaw damage ratio, and carrying out risk quantification and grading. According to the invention, the problem of inaccurate evaluation caused by limitation to local monitoring and lack of an environment factor and material parameter integrated evaluation framework in the prior art is solved.

The invention discloses a rock stratum drilling in-situ identification method based on physical information machine learning and an application thereof, which are used for solving the technical problem of in-situ sensing of unknown rock mass properties in a drilling process. Multi-source signal parameters including drilling pressure, drilling rod torque, drilling rod rotating speed, drilling speed and drilling vibration and acoustic emission signals are collected in the drilling process, CEEMDAN-VMD combined denoising and feature extraction are carried out, and fused feature vectors are input into a physical information machine learning model; and outputting the strength prediction value of the drilled rock stratum and the prediction value of the rock mass category on line in real time. The method is applied to innovative combination of freeze-thaw environment simulation, rock drilling process test and lithology intelligent identification, an advanced means is provided for drillability evaluation of freeze-thaw rock mass, data support can be provided for blasting parameter intelligent design and slope stability early warning, and the method has good engineering applicability and popularization value.

The invention discloses a cold region coating concrete critical freeze-thaw frequency estimation and service life prediction method and system, and the method comprises the steps: firstly obtaining a plurality of groups of indoor rapid freeze-thaw test data to construct a sample data set; and constructing a damage model for representing the relationship between the freezing and thawing cycle times and the freezing and thawing damage degree of the coating concrete. And then on the basis of the constructed sample data set, an optimization algorithm is adopted to search for a global optimal model parameter combination capable of enabling an output result of the damage model to be optimal, an optimal damage model is constructed on the basis of the searched global optimal model parameter combination, and a quantitative relation between the damage degree and the freezing and thawing cycle number is established. And finally, according to a damage degree threshold value specified by the coating concrete to be estimated, performing inversion calculation through the optimal damage model, accurately estimating the indoor critical freeze-thaw times required by attenuation of the coating concrete to the damage degree threshold value, and providing a basis for subsequent accurate prediction of the service life of the coating concrete.

The invention relates to preparation of stabilized soil, in particular to a freeze-thaw-resistant stabilized soil vegetation slope protection material and a preparation method thereof.The freeze-thaw-resistant stabilized soil vegetation slope protection material is prepared from, by mass, 100 parts of vegetation soil, 10 parts of cement, 8 parts of organic matter, 5 parts of greening additive and freeze-thaw-resistant additive, the freeze-thaw-resistant additive comprises polyacrylonitrile fibers, and the doping amount of the freeze-thaw-resistant additive is 0.25%-0.75% of the mass of the vegetation soil; the doping amount of the polyacrylonitrile fiber is 0.25%-0.75% of the mass of the plant-growing soil, the doping amount of the plastic steel fiber is 0.25%-0.75% of the mass of the plant-growing soil, the doping amount of the silicon powder is 1%-5% of the mass of the plant-growing soil, and the doping amount of the surfactant is 0.1%-0.3% of the mass of the plant-growing soil. The system can effectively inhibit crack initiation and expansion caused by freeze-thaw cycle. The strength loss rate after freezing and thawing is greatly reduced, and the freezing and thawing resistance is remarkably improved.

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 invention provides an Antarctic sea ice snow melting characteristic monitoring method and system based on wind cloud satellite active and passive microwave collaboration, and relates to the technical field of remote sensing satellites, and the method comprises the steps: constructing a characteristic parameter data set containing brightness temperature daily poorer and / or backscattering daily poorer; aiming at each space pixel, based on the time sequence data of the brightness temperature daily worse and / or the backscattering daily worse of the space pixel, automatically determining a freeze-thaw state discrimination threshold value of the pixel through an iterative optimization algorithm taking inter-class difference maximization as a target; for each pixel, comparing the day-by-day characteristic parameter value of the pixel with an adaptive threshold value, judging the freeze-thaw state of the pixel every day according to a preset continuity condition, and generating a time-space continuous freeze-thaw state sequence; and generating a snow melting monitoring result on the surface of the Antarctic sea ice based on the freeze-thaw state sequence. According to the invention, the accuracy of annual freeze-thaw state identification and spring and summer typical thawing initial day detection is improved.

The invention provides a mining ground fracture erosion prediction method, device and equipment under a freeze-thaw condition, and belongs to the field of geological research, and the method comprises the steps: obtaining the related data of a target mining ground fracture; calculating a frost heaving stress field and a mining-induced tensile stress field based on the related data, and performing superposition to obtain a total tensile stress field; when the total tensile stress field is greater than the tensile strength of the soil, calculating the coupling damage degree; based on the coupling damage degree, the effective cohesion and the effective internal friction angle of the soil are determined, and then the critical starting shear stress of the crack and the average flow velocity of the scouring critical state are determined; based on the critical starting shear stress and the average flow velocity, total energy consumed for erosion and collapse of the soil body in unit area is determined, and actual water flow power is calculated; and calculating the ratio of the total energy to the actual water flow power to obtain a physical index of the anti-erosion comprehensive capability of the soil so as to judge the erosion risk state of the soil crack. Therefore, space-time prediction and accurate early warning of the erosion risk can be realized.

The invention provides a power transmission and transformation project concrete mix proportion optimization method considering drought and cold region constraints, and relates to the technical field of design optimization. Key parameters are randomly allocated, and a time partition concept is adopted, so that the flowability and the hardening performance are respectively optimized in a concrete generation stage and a concrete hardening stage; through double screening of a fluidity index vector and a hardening index vector, the method ensures that the concrete has excellent resistance in a freeze-thaw cycle, and the service life of the structure is prolonged; the time position of the minimum freezing and thawing cycle number is selected through a simulation experiment, the defect that freezing and thawing influences are neglected in a traditional method is effectively overcome, the durability and reliability of concrete under the extreme weather condition are remarkably improved, and the optimization method can effectively reduce material waste and construction cost and is suitable for popularization and application. An economical and efficient solution is provided for concrete construction in the drought and cold areas, and the method has wide application prospects.

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 application relates to the technical field of building construction, in particular to a building foundation construction method based on digital twinning, which comprises the following steps: constructing a digital twin based on BIM technology; collecting the stress of a supporting structure and the soil temperature at a preset detection frequency during the overwintering period of a foundation pit, and synchronizing the stress and the soil temperature to the digital twin; calculating a freeze-thaw damage characteristic value of the supporting structure according to the area of a hysteresis loop surrounded by a stress-temperature curve in a preset temperature period, and determining the construction risk grade of the deep foundation pit according to the freeze-thaw damage characteristic value; when the construction risk grade is determined as the third type, collecting the displacement of the supporting structure at a key depth, obtaining a deformation recovery characteristic value, determining an adjustment strategy when the deformation recovery characteristic value does not meet the requirements, feeding back the adjustment strategy to a physical construction site for execution, and recording the data and the treatment result of this time to a case library to optimize the digital twin model. The application improves the intelligent level of building foundation construction.

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 discloses a prefabricated wind power mixed tower system and an assembling method. The prefabricated wind power mixed tower system comprises pipe pieces, a connecting assembly and an energy consumption assembly, and the multiple pipe pieces are spliced to form a mixed tower body; the connecting assembly is arranged between the two adjacent pipe pieces so as to fix the two adjacent pipe pieces; the energy dissipation assembly comprises a first plate and a second plate which are arranged in an overlapped mode, a part of section of at least one of the first plate and the second plate is an arc-shaped section, the first plate and the second plate can elastically deform and automatically reset, and the first plate and the second plate are each provided with a first end and a second end which are oppositely arranged in the first direction. The first end of the first plate and the first end of the second plate are connected with one of the two adjacent pipe pieces, and the second end of the first plate and the second end of the second plate are connected with the other one of the two adjacent pipe pieces. According to the embodiment of the invention, the overall structural stability is good, the assembling and connecting efficiency is high, the anti-seismic property is better, and the problems of freeze thawing and earthquake coupling damage in alpine regions are solved.

The invention relates to the technical field of geological disaster prevention and control, and particularly discloses a freeze-thaw collapse event risk early warning method based on an adaptive weighting algorithm and LSTM, and the method comprises the steps: S1, obtaining and collecting multi-source spatio-temporal data, and obtaining a unified data set; s2, obtaining an index vector of each moment; s3, obtaining a normalized feature vector; s4, obtaining a weighted feature vector at the moment; s5, obtaining prediction risk sequences from a short period to a middle period; s6, obtaining risk early warning output for emergency response and a repair strategy; according to the method, an adaptive weighting algorithm based on contribution degree evaluation is introduced, so that the model can dynamically adjust the relative importance of each input index under different time windows and environment conditions. Compared with a static weight method, the mechanism can automatically amplify physical driving factors directly associated with freeze-thaw collapse, such as the influence of short-term snow melting rate, ground temperature gradient or sudden rainfall accumulation, and meanwhile, inhibits event-independent or noise indexes.

The invention discloses a preparation method and application of a biomass-based low-temperature freeze-thaw resistant material, and belongs to the technical field of green packaging materials.The preparation method comprises the steps that a deep eutectic solvent (DES) is added into sodium alginate (SA) film forming liquid, and blended film forming liquid is obtained; and drying, crosslinking with an ethanol-calcium chloride crosslinking agent, spraying a beewax emulsion on the outer side layer after crosslinking, and volatilizing ethanol to obtain the biomass-based low-temperature freeze-thaw resistant material (SA-DES-WAX). The SA-DES-WAX prepared by the invention can reduce the entering of water molecules in the freezing and thawing cycle process, and meanwhile, an internal strong hydrogen bond system can inhibit the phase change crystallization of the water molecules, so that a biomass-based material capable of keeping the structural stability under the fluctuation of freezing and thawing temperature is obtained.

A mixture includes carbon-coated oil-treated plastic particles and particles that include geomaterial. Treating the soil at a building site includes combining carbon-coated oil-treated plastic particles and geomaterial particles to yield a mixture and providing the mixture in a built environment to enhance soil stability under freezing conditions.

The application discloses a seven-layer gradient function composite repairing construction method for concrete freeze-thaw damage, and the method comprises the following steps: investigating a freeze-thaw damage area, determining damage depth and range, removing all loose, peeled and cracked concrete by using mechanical tools until the base surface is exposed, carrying out rust removal and corrosion prevention treatment on the exposed steel bars, cleaning the interface by using high-pressure water jet, removing dust and debris, and coating, in sequence, a primer, anti-freezing repair mortar, nano-enhanced coating, cement-based anti-freezing, waterproof and corrosion-proof protective coating, alkali-resistant sealing primer and protective coating on the base surface, wherein the protective coating is coated in two layers, the damaged base body is reconstructed in a gradient mode, the structural integrity is restored, a long-acting protection system with the functions of active protection and passive barrier is constructed from inside to outside and with gradient transition of material properties, and the service life of the repaired structure in an extreme environment is significantly prolonged.

The application discloses a quaternary solid waste-based soil stabilizer (GSCP) for a base layer, which is composed of slag (GGBFS), steel slag (SSA), calcium carbide slag (CS) and phosphogypsum (PG) and has a weight ratio of GGBFS:SSA:CS:PG=56:24:12:8. The stabilizer forms C-S-H colloid and ettringite (AFt) through alkaline activation and sulfate activation, does not need to add cement or chemical activator, is used for stabilizing silty clay and steel slag mixed soil, and significantly improves the unconfined compressive strength, splitting tensile strength, water stability and freeze-thaw resistance. Compared with a traditional cement-based stabilizer, the application reduces carbon emission by 82% and cost by 31.25%, provides a low-carbon and economical solution for road engineering, and is suitable for the base layer and the subbase layer of a secondary road or above.

The utility model discloses rapid freezing and thawing equipment which comprises a water outlet pipe and a water return pipe and further comprises a refrigerating unit and a heating unit, the refrigerating unit comprises a cold water tank, a cold water pump, a compressor, a condenser and an evaporator, an inlet pipeline of the cold water pump is connected with the evaporator, and an outlet pipeline of the cold water pump is connected with the water outlet pipe; an inlet pipeline of the cold water tank is connected with the water return pipe; an outlet pipeline of the cold water tank is connected with the evaporator; the heating unit comprises a hot water tank, a hot water pump and a heater arranged in the hot water tank; an inlet pipeline of the hot water tank is connected with the water return pipe, and an outlet pipeline of the hot water tank is connected with the hot water pump. According to the technical scheme provided by the utility model, the refrigerating unit and the heating unit are integrated into a whole, and the same equipment can realize the function of switching between quick freezing and thawing at any time, so that the acquisition cost of the equipment can be greatly reduced, and the quantity and the operation cost of the equipment are reduced.

The application discloses a kind of solidified soil strength calculation method and system considering freeze-thaw cycle number and burying depth, propose the strength and modulus reduction factor concept of solidified soil under different freeze-thaw cycle;Then according to the test data obtained, the strength and modulus reduction factor of solidified soil under the action of freeze-thaw cycle under different burying depth is calculated;Strength and modulus reduction factor and burying depth, freeze-thaw cycle number composite exponential function model is established;Through composite exponential function model, the reduction factor of solidified soil under different freeze-thaw cycle is calculated, the strength and modulus of solidified soil without freeze-thaw cycle obtained by indoor test are combined, and the strength and modulus of solidified soil under different depth and freeze-thaw cycle are calculated.In practical engineering, the strength and modulus of solidified soil under different freeze-thaw cycle number at different burying depth can be used for long-term strength and deformation calculation of foundation.

The application discloses a kind of deep melting interlayer development area rigid pile composite foundation structure design method, it is related to rigid pile composite foundation field, including the following steps: step one, in the existing rigid pile bearing capacity calculation process, front-end increase subgrade-ground temperature field analysis;Step two, increase groundwater analysis;Step three, determine the compression modulus of the soil layer of seasonal freeze-thaw layer, (water-rich) melting interlayer, permafrost layer, bearing capacity characteristic value, check the single pile bearing capacity characteristic value of different positions in the cross section of roadbed using different pile length, pile diameter, pile body stiffness material;Step four, carry out zoned unequal design, adjust pile length, pile diameter, pile body stiffness, so that the range of all pile single pile bearing capacity characteristic values in cross section is lower than design allowable value.The application effectively optimizes pile foundation design, reduces material waste, reduces engineering cost, while ensuring the safety and stability of structure.

The application discloses a kind of based on bentonite-based mineral gel subgrade slope double-layer anti-seepage reinforcement method, belong to road engineering anti-seepage reinforcement technical field, including bottom coarse-grained anti-seepage layer, top fine-grained anti-seepage layer, slope anti-seepage layer, after mixing coarse-grained bentonite-based mineral gel particles with bottom coarse-grained soil particles, water curing, paving compaction forms bottom coarse-grained anti-seepage layer, after compaction, continue to fill in the slope anti-seepage layer near the slope of subgrade, layer by layer, finally, after mixing fine-grained bentonite-based mineral gel particles with top fine-grained soil particles, water curing, paving compaction forms top fine-grained anti-seepage layer.The application has the advantages of significant anti-seepage effect, strong freeze-thaw resistance and strong environmental adaptability using the above-mentioned based on bentonite-based mineral gel subgrade slope double-layer anti-seepage reinforcement method, effectively hinders groundwater rise, rain and snow water infiltration and slope seepage reinforcement effect, avoids cracking and collapse of subgrade in permafrost region during operation.

The utility model relates to the technical field of unfreezing machines, and discloses a submerged impingement flow low-temperature unfreezing machine which comprises a box body and an unfreezing device arranged in the box body, an upper cover plate is arranged at an opening in the top of the box body, a water inlet pipe penetrates through the upper cover plate, an upper pipe opening of the water inlet pipe protrudes out of the upper cover plate, and a lower pipe opening of the water inlet pipe downwards extends into the box body. The end of the lower pipe opening is sleeved with a water flow impact ball. The device can be used for efficiently unfreezing the freezing and thawing bags in a low-temperature environment, effectively reduces the generation of ice crystals in the unfreezing process through ultrasonic vibration, and is suitable for unfreezing small batches of freezing and thawing bags in a laboratory. The device is provided with the water flow impact ball, the water flow impact ball is connected to the bottom of the water inlet pipe in a sleeving mode, a proper hole is formed in the water flow impact ball, impact water flow conveniently penetrates through a water body to impact the freezing and thawing bag, and the freezing and thawing bag is unfrozen through low-temperature water in a low-temperature environment. A plurality of groups of sleeving structures of the water inlet pipes and the water flow impact balls are arranged in the box body, so that a plurality of freezing and thawing bags can be unfrozen at one time, and the unfreezing efficiency is high.

The application discloses a highland concrete freeze-thaw action environment zoning method, and belongs to the technical field of environment zoning of concrete structure design, and comprises the following steps: acquiring high-resolution daily weather data sets of a highland region in a future design reference period; determining the number of natural effective freeze-thaw cycles of each grid point in the highland region in the future design reference period based on the high-resolution daily weather data sets, and acquiring a salt acceleration factor of each grid point in the highland region; for each grid point, correcting the number of natural effective freeze-thaw cycles in the future design reference period based on the salt acceleration factor, and determining the number of corrected effective freeze-thaw cycles; and dividing the service environment of a concrete structure in the highland region based on the number of corrected effective freeze-thaw cycles of each grid point in the highland region. The method combines the influence of salt and freeze coupling damage on concrete, and can improve the accuracy of concrete freeze-thaw action environment zoning in the highland region.

The application discloses an anti-wind-pressure integrated assembly type external wall external thermal insulation system and a construction method thereof, and is suitable for ground buildings of pumped storage power stations in severe cold regions and comprises a main body structure, a non-load-bearing wall, a steel wire mesh frame composite rock wool board and the like. Through technologies such as anchor bar+anchor bolt double anchoring, steel keel frame overall support and integral connection of the steel wire mesh frame composite rock wool board and the structure, the problems of easy falling of the thermal insulation layer, wind pressure difference and freeze-thaw resistance are solved, the advantages of anti-wind-pressure greater than or equal to 5kPa, no damage after 200 times of freeze-thaw cycles at-40 DEG C and a construction period shortened by 40% are realized, and the application has good industrialization popularization value.

The invention relates to the technical field of earthen archaeological site ramming and supplementing, in particular to an earthen archaeological site layered ramming and supplementing method and system for resisting moisture and freeze thawing, and the method comprises the steps: constructing an earthen archaeological site digital model, obtaining a ramming and supplementing material group according to a homologous soil material and a preset moisture and freeze thawing resistant material group, and preparing an optimal fusion soil material based on a material ratio constraint condition, and identifying a to-be-tamped area group in the to-be-tamped earthen site based on the earthen site digital model, carrying out chemical solidification on the to-be-tamped area group by using a chemical reinforcement solution to obtain a target tamped area group, and carrying out multilayer tamping on the target tamped area group by using the optimal fusion soil material, the dynamic deformation modulus tester and the rammer to obtain a tamped area group. According to the method, the durability of the rammed complement and the compatibility of the original ruins can be improved, and the repeated repair risk caused by material degradation or interface failure is reduced.

The invention discloses a concentrated solution for a hydraulic support based on a coal-based Fischer-Tropsch synthesis technology and a preparation method of the concentrated solution, and particularly relates to the technical field of hydraulic support concentrated solutions, the concentrated solution comprises the following components: 30-45% of a coal-based Fischer-Tropsch synthesis oil derivative lubricant, 5-12% of a gasified ash modified additive, 8-15% of a composite antirust agent, 10-18% of a nonionic emulsifier, 3-8% of a freeze-thaw stabilizer, and the balance of water. And the balance water. The concentrated solution provided by the invention takes the Fischer-Tropsch synthetic oil derivative as a core lubricating component, and is combined with the gasified ash modified additive and the like, so that the problem of soap precipitation blockage caused by high-hardness mine water is effectively solved, and the concentrated solution has good freeze-thaw resistance and environmental protection property, meets the current environmental protection standard, and is particularly suitable for a highly-mineralized mining area environment in Shanxi.

The invention discloses a freeze-thaw cycle machine suitable for biochar freeze-thaw cycle experiment, which comprises a machine body bearing frame, a cycle freeze-thaw structure is arranged in the machine body bearing frame, a transfer structure is arranged at the upper end of the cycle freeze-thaw structure, and a material storage structure is arranged at the bottom end of the transfer structure. And the bottom surface of the machine body bearing frame is fixedly connected with a bearing base. According to the freeze-thaw cycle machine suitable for the biochar freeze-thaw cycle experiment provided by the invention, a storage box in a material storage structure is arranged and is connected with a telescopic rod of a lifting mechanism through a connecting frame, a connecting seat and an insertion locking mechanism consisting of an insertion rod, an insertion block and a second spring; by means of the design, an operator only needs to pull the pull ring to unlock, the storage box and the material storage box in the storage box can be easily taken down together, the replacing and cleaning processes of different batches of samples are greatly simplified, and the overall operation efficiency and operation convenience are remarkably improved.