401 results about "Frost heaving" patented technology

The invention provides a seasonal frozen earth region roadbed stability evaluation method, a seasonal frozen earth region roadbed stability evaluation device and a medium, and relates to the technical field of seasonal frozen earth region roadbed stability evaluation. Meanwhile, performing a freeze-thaw cycle experiment in a laboratory, and fitting to obtain a heat conduction coefficient and a moisture diffusion coefficient of the soil sample; inputting field data and experimental parameters into the finite element model, simulating hydrothermal transfer and mechanical behaviors under different seepage and drainage grating arrangement conditions, and analyzing dynamic change rules of a temperature field, a water content field and frost heaving stress; then, a hydrothermal dynamic behavior and rib-soil interface behavior prediction model is trained based on an LSTM network architecture, and hydrothermal changes and mechanical properties of the roadbed under different conditions are predicted; and finally, based on an output result of the prediction model, calculating a roadbed stability index by combining a comprehensive stability evaluation model.

The invention discloses an anti-freezing power transmission line tower supporting foundation suitable for a frozen soil area, relates to the technical field of power transmission line tower supporting, and aims to solve the problem that an existing power transmission line tower supporting foundation cannot resist freezing and cannot keep supporting efficiency under season replacement. Comprising a pile foundation cylinder, a pile foundation cylinder inner supporting column, an arc-shaped heat conduction pipe and a frost heaving piercing mechanism. A pile foundation cylinder top seat and a power transmission line tower connecting frame are mounted at the top of the pile foundation cylinder; the pile foundation cylinder inner supporting column is embedded in the pile foundation cylinder, circulating flow channels are designed between the pile foundation cylinder inner supporting column and the pile foundation cylinder and between the pile foundation cylinder inner supporting column and the arc-shaped heat conduction pipe, and an equipment mounting inner cavity is formed in the top of the pile foundation cylinder inner supporting column. When the soil body is subjected to frost heaving, the transverse anchor rods can pierce into the surrounding soil body, so that the pile foundation cylinder and the surrounding soil body are anchored together, and the frost heaving is further resisted.

The invention discloses a cold region tunnel freeze injury diagnosis, risk grading and control system and method, and relates to the technical field of tunnel engineering. The system comprises a basic data layer for storing disease, index and measure databases; the core analysis layer is used for diagnosing a frost heaving mechanism, identifying single-factor, double-factor and three-factor frost heaving types, calculating freezing depth and frost heaving force and analyzing sensitivity; the risk level evaluation layer is used for dividing a disease zone, a frost heaving level, a freezing injury risk and a freezing injury risk response level; and the intelligent decision-making layer constructs an intelligent comprehensive decision-making analysis platform to realize risk-measure accurate matching and closed-loop management and control. The method comprises the four steps of data acquisition and storage, frost heaving mechanism diagnosis and quantification, risk grade evaluation and intelligent decision measure matching, through multi-source data fusion, multi-factor coupling analysis and zoning and grading prevention and control, the whole-process accurate management and control of the cold region tunnel frost damage is realized, and the frost damage treatment efficiency and the tunnel operation safety are improved.

The invention discloses a rapid reconstruction method, device and equipment for a soil mass freeze-thaw hydrothermal field and a storage medium, and the method comprises the steps: building a one-dimensional soil column frost heaving-thaw collapse calculation model through finite element software, carrying out the simulation calculation to obtain a soil mass one-dimensional freeze-thaw transient temperature field and a moisture field, and obtaining a source domain data set containing the position, time, temperature and saturation; the position and time in the source domain data set serve as input, temperature and saturation serve as output, a deep neural network is established, and a loss function comprises data loss and physical loss and also relates to a temperature field and a moisture field; training the source task model to obtain neural network parameters; and training the target task model. On the basis of numerical simulation and deep transfer learning, the problem of multi-field coupling under the background of machine learning is solved, and meanwhile, the generalization performance of the model is improved, so that rapid reconstruction of the transient temperature field and the moisture field of the one-dimensional frost heaving-thaw collapse test of the soil body under the condition of sparse measuring points is realized.

The invention relates to the field of new-generation information technology and civil engineering, in particular to a frost heaving prevention technology of a roadbed in a seasonal frozen area, and particularly relates to a solar heating frost heaving prevention drainage roadbed in the seasonal frozen area and a construction method of the solar heating frost heaving prevention drainage roadbed. The method comprises the steps that environment sunlight data are obtained based on a solar heat collection device, heat energy is stored through an efficient heat storage material, and a heat energy output sequence is generated; acquiring soil temperature, humidity and frost heaving stress data from an environment sensor, predicting a frost heaving trend in combination with historical frost heaving characteristics, and generating regulation and control parameters; the heat energy output sequence and the frost heaving regulation and control parameters are input into a dynamic temperature control and drainage linkage module, heat distribution and optimization adjustment of a drainage path are carried out, and a linkage control strategy is generated; and performing feedback analysis on the operation condition of each module based on the data, and optimizing the control parameters of the dynamic temperature control and drainage linkage module. The temperature and humidity of the roadbed can be accurately adjusted, the frost heaving phenomenon is prevented, and roadbed drainage is optimized.

The invention discloses a multi-factor coupling action slope dangerous rock mass instability starting speed determination method which comprises the following steps: establishing a dangerous rock mass generalization mechanical model, simplifying a dangerous rock mass main control structural plane into two parts, namely a through section and a non-through main control structural plane, and controlling dangerous rock mass instability damage by a rock mass corresponding to the dangerous rock mass main control structural plane; carrying out stress analysis on the dangerous rock mass and the locking section rock mass based on the external load effect and the generalized mechanical model of the dangerous rock mass; the external load effect comprises horizontal and vertical earthquake force, frost heaving force, fracture water pressure or excess pore water pressure; determining elastic strain energy released by potential energy reduction in crack propagation of the main control structural plane of the dangerous rock mass based on a multi-factor coupling effect; and on the basis of the assumption that elastic strain energy released by reduction of potential energy in crack propagation of the main control structural plane of the dangerous rock mass is instantaneously released and converted into kinetic energy of dangerous rock mass movement, the instability starting speed of slope dangerous rock mass severe movement under the multi-factor coupling effect is determined. The invention further discloses a system, electronic equipment and a computer readable storage medium.

The invention provides a temperature control type anti-frost-heaving retaining wall structure and a design method thereof, and belongs to the technical field of infrastructure retaining engineering in cold regions, the temperature control type anti-frost-heaving retaining wall structure comprises a retaining wall body, a ground temperature energy conversion system and an intelligent control system, and the ground temperature energy conversion system is connected with the retaining wall body; the ground temperature energy conversion system is used for absorbing ground temperature energy, converting a gas-state heating medium from a low-pressure state into a high-pressure state, adjusting the flow of a liquid-state heating medium, reducing the pressure of the heating medium and dissipating the ground temperature energy into the retaining wall body, and the intelligent control system is electrically connected with the ground temperature energy conversion system; the controller is used for monitoring the temperature of filling soil on one side of the retaining wall body and controlling the ground temperature energy conversion system to operate according to the filling soil temperature so as to control the retaining wall body temperature and filling soil heat. The technical problems that the retaining wall frost heaving disease control difficulty is large, and the frost damage prevention and control effect is poor are solved, and the technical effects that the retaining wall and the filling temperature can be controlled, frost heaving disease control is easy, and the frost damage prevention and control effect is good are achieved.

The present invention discloses a system and method for preventing and controlling frost heave damage in railway subgrades adapted to severe cold climates. This system belongs to the field of seasonal frozen soil engineering technology. The prevention and control system includes several ground-source heat pump devices consisting of heating units, heating pipes, heat collecting pipes, and a detection assembly. Several heating units are arranged at the foot of the subgrade slope along the length of the railway. The heating pipes are laid in the frost heave development layer of the subgrade, and the heat collecting pipes are installed in the stable layers of the foundation on both sides of the subgrade. A heat carrier circulates through the pipeline consisting of the heating pipes, heating units, and heat collecting pipes. Temperature sensors, pressure sensors, and displacement sensors are used to monitor the subgrade freezing temperature, heat carrier temperature, compressor intake and exhaust pressures, and track deformation, respectively. A control assembly receives signals from the detection assembly and controls the operating mode of the heating units. The present invention ensures rapid compressor superheat establishment during startup in severe cold environments and rationally controls the compressor exhaust temperature range and operating mode during normal operation.

The invention discloses a frozen soil area shallow-buried self-anchored pile foundation freezing and pulling prevention and control device and a construction method, the frozen soil area shallow-buried self-anchored pile foundation freezing and pulling prevention and control device comprises an anchoring cylinder, a sleeve, a pile foundation and a base, the pile foundation and the base are installed in the anchoring cylinder, the pile foundation is installed at the top of the base, and the anchoring cylinder is sleeved with the sleeve; through the arrangement of the upper block, the lower block, the upper open groove and the lower open groove of the anchoring barrel, the effect of changing the cross section in real time according to frost heaving development is provided for the anchoring barrel. Meanwhile, the stress condition of the pile foundation in the frost heaving period is optimized through the synergistic effect of the clamping blocks and the supports, when the upper block inclines inwards and deforms in the frost heaving period, the supports are extruded to contract towards the pile foundation, the gaps between the clamping blocks and the supports are gradually reduced till the clamping blocks make contact with the supports, the clamping blocks press the supports downwards, the supports apply downward force to the pile foundation, and the pile foundation is prevented from being pulled upwards. In addition, the stability and the anti-freezing and anti-pulling capacity of the pile foundation are enhanced through the base, and the shallow-buried pile foundation is promoted to meet the strict deformation control requirement.

The invention discloses a railway roadbed frost heaving disease prevention and control system and method adapting to severe cold climate, and belongs to the technical field of seasonal frozen soil engineering.The prevention and control system comprises a plurality of ground source heat pump devices composed of heating units, heat supply pipes, heat collection pipes and detection assemblies, and the heating units are arranged at the slope toe position of a roadbed in the length direction of a railway; the heat supply pipe is laid on a frost heaving development layer of a roadbed, the heat collecting pipes are arranged on stable layers of the roadbed on the two sides of the roadbed, and the heat-carrying agent circularly flows in a pipeline composed of the heat supply pipe, the heating unit and the heat collecting pipes. A temperature sensor, a pressure sensor and a displacement sensor are used for monitoring the roadbed freezing temperature, the heat-carrying agent temperature, the suction and exhaust pressure of a compressor and the deformation amount of a track; and the control assembly receives a signal of the detection assembly and controls the operation mode of the heating unit. According to the method, rapid establishment of the superheat degree of the compressor in the starting stage in the severe cold environment and reasonable control over the exhaust temperature range and the operation mode of the compressor in the normal operation stage can be guaranteed.

A plateau mountain area road slope geological disaster automatic identification method fusing multiple data comprises the following steps: S1, acquiring multi-source heterogeneous data of a target slope area, including a time sequence satellite optical image, synthetic aperture radar interferometry (InSAR) deformation data, laser radar (LiDAR) point cloud data, meteorological and hydrological data and basic geological data, and generating fusion data; s2, constructing a space-time registration module, unifying the multi-source data obtained in the S1, establishing a unified space-time coordinate system for the multi-source data, and generating fusion data; and S3, processing synthetic aperture radar interferometry (InSAR) deformation data through a freeze-thaw cycle noise compensation model, and eliminating deformation noise caused by seasonal frost heaving and thaw collapse. According to the plateau slope disaster identification method, the plateau freeze-thaw compensation model is combined with a multi-modal dynamic decision-making mechanism, and physical mechanism complementation of InSAR and LiDAR is adopted, so that'earth surface deformation-rock mass structure 'two-dimensional verification is realized, and multi-data fusion is realized, and therefore, the automatic identification precision of plateau slope disasters is improved.

The invention discloses a normal frost heaving force prevention and control structure for a shallow-buried contact net pile foundation in a frozen soil region and a construction method. A plurality of combination grooves are uniformly formed in the side wall of a fixed cylinder in the circumferential direction, an upper heat insulation layer is arranged on the outer wall of the fixed cylinder, and an elastic buffer mechanism is arranged at the connecting position of the fixed cylinder and a bottom cylinder; a pile foundation is arranged in the fixing cylinder, a buffer gap is reserved between the outer wall of the pile foundation and the inner wall of the fixing cylinder, and a plurality of inclined struts are arranged in the buffer gap; the inclined struts comprise the upper inclined strut and the lower inclined strut, the two ends of the upper inclined strut are fixedly connected with the pile foundation and the fixing cylinder respectively, one end of the lower inclined strut is fixed to the pile foundation, and the other end of the lower inclined strut abuts against the inner wall of the fixing cylinder. A hydraulic buffering mechanism is arranged on the lower portion of the pile foundation. The horizontal frost heaving force from the side face is effectively dispersed through the arrangement of the inclined struts, the elastic buffering assembly and the hydraulic buffering mechanism work cooperatively, and the normal frost heaving force is effectively offset through the dual effects of elastic deformation and hydraulic damping.

The invention discloses a frozen soil column test device and method based on thermoelectric refrigeration and DIC monitoring, the device comprises a transparent soil column container, a temperature control system and a digital image acquisition system, the transparent soil column container is used for containing a soil column sample, and the transparent soil column container is formed by combining two double-layer cylinder wall acrylic semicircular cylinders; the frozen soil freezing process and the frost heaving behavior are visualized, and real-time monitoring and analysis are facilitated. During an experiment, internal and external temperatures are accurately adjusted through a temperature control system to simulate a frozen soil freezing process; the digital image acquisition system shoots a soil column surface image in real time through a high-resolution camera, digital speckles are combined, real-time monitoring and analysis of the soil body frost heaving amount and the freezing frontal surface position are carried out through a digital image related technology, and the soil body frost heaving characteristic and the freezing frontal surface dynamic change can be measured with high precision.

The invention provides an anti-freezing optical cable freezing expansion pressure detection analysis method and system, and relates to the field of optical cable freezing prevention. The method comprises the steps of analyzing strain and deformation of a protection steel pipe and an optical cable in the protection steel pipe according to an optical cable structure and a protection steel pipe structure, and constructing a strain and deformation calculation model; through basic parameters of the optical cable and the protection steel pipe, calculating a cross sectional area variation by using a strain and deformation calculation model; constructing an optical cable pressure calculation model according to the relationship between the cross sectional area variations; analyzing the pressure caused by the icing layer in the protection steel pipe and a frost heaving strain theory, and constructing a frost heaving strain distribution model under the continuous icing layer condition; and according to the constructed optical cable pressure calculation model and the frost heaving strain distribution model under the continuous icing layer condition, frost heaving pressure calculation and related factor analysis of the internal material of the protection steel pipe are carried out. According to the method, influence factors of optical cable freezing damage are deeply analyzed, and guidance is provided for improving the anti-freezing design of the directly-buried optical cable.

The invention discloses an extra-strong frost heaving area cast-in-situ bored pile protection structure and a construction method.The extra-strong frost heaving area cast-in-situ bored pile protection structure comprises a forming cylinder body, a displacement cylinder body arranged on the outer side of the forming cylinder body in a sliding and sleeving mode and a fixed cylinder body arranged on the outer side of the forming cylinder body in a sleeving mode, and the fixed cylinder body is located above the displacement cylinder body; the fixed cylinder body is fixed below the seasonal frozen soil through a fixing assembly, and a clamping assembly is arranged between the forming cylinder body and the displacement cylinder body, so that when the forming cylinder body moves upwards to a preset position, the forming cylinder body and the displacement cylinder body are fixed together through the clamping assembly to limit the ascending displacement of the forming cylinder body; a slip ring is arranged at the top of the displacement barrel, a fixing ring with a conical structure is fixed to the bottom of the outer side of the fixing barrel, and the inner circumferential inclined face of the slip ring is in sliding fit with the outer circumferential inclined face of the fixing ring. By means of the displacement of frost heaving and thaw collapse of the formed cylinder, returning of the formed cylinder and application of acting force of anti-frost heaving displacement are achieved, and the generation of the frost heaving amount is reduced.

The invention provides a concrete lining channel frost heaving strain experiment device, and relates to the technical field of freeze-thaw cycle test devices, the concrete lining channel frost heaving strain experiment device comprises a frost heaving body accommodating bin, the axis of the frost heaving body accommodating bin is uniformly provided with a plurality of temperature sensors from bottom to top at intervals; a frost heaving soil layer is filled in a frost heaving body accommodating bin below the simulated lining, and the axial displacement monitoring device is used for detecting the axial displacement of the simulated lining; freeze-thaw media are pumped into the medium containing bins, and the freeze-thaw media exchange heat with the frost heaving body containing bins above so as to promote frost heaving change of the frost heaving soil layer. A traditional prefabricated concrete lining structure is replaced with the simulation lining, the simulation lining can be repeatedly used, meanwhile, concrete of different grades and strengths can be further simulated, consumption of raw materials is greatly reduced, and the method is rapid, efficient, energy-saving and environmentally friendly; and meanwhile, the existing scattered structures are integrated, so that the occupied space is reduced.

The invention relates to the technical field of subway tunnel freezing method construction, in particular to an artificial stratum freezing wall thickness maintaining method based on freezing wall cooling capacity demand, which comprises the following steps: establishing an artificial freezing process hydrothermal phase change coupling numerical simulation method; introducing a freezing wall cooling capacity demand concept by considering a heat exchange relationship between the freezing wall edge and the surrounding environment; a freezing wall cold demand calculation model is established by considering various influence factors on the freezing wall cold demand; and finally, the freezing wall thickness control technology based on the cooling capacity requirement is applied to construction of an artificial stratum. According to the artificial stratum freezing wall thickness maintaining method based on the freezing wall cooling capacity requirement, the freezing pipe cooling capacity can be adjusted according to the freezing wall thickness, heat exchange dynamic balance between the outer wall of the freezing wall and the surrounding soil body is achieved by adjusting the freezing pipe cooling capacity, and it is guaranteed that the freezing wall thickness is kept unchanged; frost heaving caused by continuous expansion of the freezing wall can be avoided, the ground deformation is large in the freezing wall thawing process, and the influence on the environment is small.

The supporting foundation structure suitable for the frozen soil region comprises a pile foundation cylinder, a pile foundation cylinder top seat, a pile foundation cylinder base and a frost heaving piercing mechanism, the pile foundation cylinder top seat is fixedly installed at the top of the pile foundation cylinder, and the pile foundation cylinder top seat is used for being connected with a to-be-supported target; a pile foundation cylinder base is arranged at the bottom of the pile foundation cylinder, and a plurality of threaded drill rod assemblies are arranged on the pile foundation cylinder base and used for being fixed to a foundation. The frost heaving piercing mechanism is fixedly installed on the cylinder wall of the pile foundation cylinder. When frost heaving happens to a soil body, under the effect of frost heaving, the transverse anchor rod of the frost heaving piercing mechanism can transversely pierce into the soil body outwards, so that the pile foundation cylinder and the surrounding soil body are anchored together. In addition, due to the fact that the inner diameter of the vertical straight pipe section of the frost heaving piercing mechanism is larger than the inner diameter of the top bent pipe section, even if the soil body frost heaving deformation is small, the transverse anchor rod can generate large transverse piercing displacement.

The invention discloses a method and device for testing moisture migration in the frost heaving and thaw collapse process of fiber cement soil based on low-field nuclear magnetic resonance, and relates to the field of cement soil testing engineering.The method comprises the steps that T2 spectrums of the whole freezing process and the whole thawing process of a fiber cement soil sample are obtained; inverting a three-dimensional moisture distribution diagram of the whole freezing process and the whole melting process of the fiber cement soil sample according to the T2 spectrum; and determining moisture migration conditions of the whole freezing process and the whole melting process of the fiber cement soil sample according to the three-dimensional moisture distribution diagrams of the whole freezing process and the whole melting process of the fiber cement soil sample. According to the method, T2 spectrum data is mapped to a three-dimensional space position on the basis of a nuclear magnetic resonance (NMR) signal gradient positioning technology, and a pixel-level three-dimensional moisture distribution diagram of a fiber cement soil sample is obtained by performing data inversion on a T2 spectrum, so that pixel-level moisture migration conditions in the freezing process and the melting process of the fiber cement soil are visualized.

The invention provides a special-shaped freezing construction method suitable for shield butt joint asynchronous control frost heaving, and relates to the technical field of shield tunnel engineering.During shield butt joint freezing construction, an anterior shield and a posterior shield adopt asymmetric freezing, an anterior shield freezing pipe serves as a main freezing side, and a posterior shield freezing pipe serves as an auxiliary freezing side; and a freezing body formed by the previous shield freezing pipe completely envelops the butt joint position of the subsequent shield cutterhead. By designing an asymmetric special-shaped freezing hole arrangement form and combining the technical means of asynchronous freezing control, the forming time and range of a freezing wall and the bearing requirement can be effectively controlled, the requirements for shield butt joint and freezing hole drilling precision are effectively lowered, the shield butt joint frost heaving problem under a high-water-pressure strong permeable stratum is effectively restrained, and the construction efficiency is improved. The frost heaving effect on the shield body is reduced, the safety and stability of the shield shell are ensured, and safe and reliable frozen wall support is provided for subsequent butt joint excavation.

The invention relates to the technical field of buried natural gas cold transportation pipelines, in particular to a buried natural gas cold transportation pipeline foundation soil frost heaving prevention and treatment device and method.The buried natural gas cold transportation pipeline foundation soil frost heaving prevention and treatment device comprises a pipeline body, a soil layer is arranged outside the pipeline body, and a water tank is installed at the position, close to the right side, above the soil layer; the whole S-shaped water guide pipe is arranged in an arc shape around the pipeline body, the two ends of the S-shaped water guide pipe penetrate through the soil layer to be fixedly connected with the rear wall and the left wall of the water tank correspondingly, and the right end of the S-shaped water guide pipe penetrates through the left wall of the water tank, extends into the water tank and is provided with a water pump; through a series of structures, the device has the advantages of being good in frost heaving prevention and treatment effect, capable of automatically storing energy, good in energy-saving effect, convenient to adjust and the like.

The invention provides a real-time testing device for frost heaving force and deformation of a cylindrical concrete sample under the freezing-thawing-load coupling effect, and relates to the technical field of concrete testing devices.The real-time testing device comprises a testing box body and a box cover, and the interior of the testing box body is divided into a testing cabin and a mechanism cabin through a partition plate; a cylindrical concrete sample is placed through the bearing base, a sample side edge wrapping belt is arranged in the mechanism cabin in a winding mode through a winding roller seat and wraps the side edge of the cylindrical concrete sample by a circle, and a freeze-thaw liquid inlet and outlet is further formed in the bottom, located on one side of the test cabin, of the test box body. According to the invention, targeted design is carried out aiming at the special form of the cylinder sample, so that the detection requirements of the cylinder samples with different specifications can be met, a traditional detection means is abandoned in the side edge detection process, detection is carried out by adopting a side edge wrapping belt wrapping and winding mode, and compared with an existing abutting detection means, the detection efficiency is greatly improved. The change of the cylindrical sample can be amplified, so that the test data is more intuitive.

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 relates to the technical field of railroad bed structures, and discloses a deep season frozen soil area existing railroad bed heat preservation, water insulation and frost heaving prevention structure and a construction method of the deep season frozen soil area existing railroad bed heat preservation, water insulation and frost heaving prevention structure. The invention relates to a heat-insulating waterproof frost heaving-preventing structure for an existing railroad bed in a deep seasonal frozen soil region. The overall cross section of the existing railroad bed is of an axial symmetry structure along the center line of the railroad bed; the existing railway subgrade foundation bed is sequentially provided with a first gravel cushion layer, a waterproof geotechnical cloth layer, a second gravel cushion layer, a geogrid layer and a closed railway ballast layer from bottom to top. Polyurethane heat preservation layers are arranged on side slopes on the two sides of the existing railroad bed. A polyurethane heat preservation layer and a waterproof geotechnical cloth layer are sequentially arranged on the road shoulders on the two sides of the existing railroad bed from bottom to top. A drainage channel is arranged at the slope toe of the existing railroad bed; a polyurethane heat preservation layer is arranged on the connecting section of the slope toe of the existing railroad bed and the drainage channel. The thermal-insulation waterproof frost heaving prevention structure for the existing railroad bed in the deep seasonal frozen soil region can be suitable for treatment and maintenance of frost heaving disasters of the existing railroad bed in the deep seasonal frozen soil region, and has a good engineering application prospect.

The invention provides a method for improving the removal rate of heavy metals in cohesive soil based on a freeze-thaw method. The method comprises the steps of pretreatment, water replenishing saturation, freezing and freezing, heating thaw settlement, leachate collection, repeated leaching and the like. Wherein the pretreatment step comprises the steps of filling a compacted cohesive soil column with akadama soil and compacting the akadama soil in a layered manner to prepare a mixed soil column, that is, the akadama soil and the cohesive soil are filled in a layered manner, the akadama soil with strong frost heaving property is used as admixture soil, the akadama soil structure is seriously broken after freezing and thawing circulation, the number of pores is increased, and migration and storage of water are facilitated; meanwhile, the adsorption capacity of the akadama soil to lead, cadmium and other heavy metal elements is weak, and the akadama soil can be repeatedly used for repairing the heavy metal polluted cohesive soil, so that the method provided by the invention can effectively improve the intake of the eluting agent, improve the removal rate of the heavy metal elements and shorten the soil repairing period, and is beneficial to outdoor large-scale popularization and application.

The invention discloses an ecological maintenance structure for the geological environment of a slope in a high-altitude freeze-thaw area, and belongs to the field of ecological restoration and water and soil conservation of slopes in high-altitude frozen soil areas. Comprising a side slope platform, a slope surface is integrally formed on the rear surface of the side slope platform, a plurality of drainage channels are integrally formed in the front surface of the slope surface, a plurality of sedimentation tanks are formed in the position, located in front of the slope surface, of the upper surface of the side slope platform, and the drainage channels communicate with the sedimentation tanks correspondingly; the two adjacent sedimentation tanks are communicated with each other; a water pumping mechanism is arranged on the right side of the side slope platform; an irrigation mechanism is arranged on the upper surface of the slope surface; the irrigation mechanism comprises a mounting box; the water flow speed is slowed down through the interval variable angle design of the drainage channel; the surface runoff can be rapidly guided through the 30-degree slope section, and frost heaving caused by accumulated water permeation is avoided; the 5-degree gentle slope section promotes natural sedimentation of silt by reducing the water flow speed, reduces water and soil loss and disperses hydraulic scouring.

The present invention provides a construction control method and system for the frost heave and thaw settlement characteristics of a frozen soil layer, and relates to a technical field, including obtaining a plurality of engineering geological characteristic parameters at a construction site; establishing a multi-field coupled three-dimensional numerical analysis model that simulates heat conduction, water migration, and stress deformation of a frozen soil layer, and using comparative data to calibrate and verify the established multi-field coupled three-dimensional numerical analysis model; using the calibrated and verified multi-field coupled three-dimensional numerical analysis model, and determining a target threshold range for frost heave deformation control and a target threshold range for thaw settlement deformation control of a frozen soil layer through a multi-objective optimization algorithm; a data processing and analysis system performs real-time analysis and fusion on monitoring data uploaded by a wireless sensor network, and outputs corresponding construction control decision instructions.

The invention relates to the technical field of power transmission tower supporting, in particular to a frost heaving prevention device of a power transmission tower underground structure and a control method thereof.The frost heaving prevention device of the power transmission tower underground structure comprises a tower foundation body, the tower foundation body is inserted into soil during installation, and the tower foundation body comprises an upper part and a lower part; the upper part is of a conical tower-shaped stepped structure, and the small end of the upper part is arranged on the upper part, so that the horizontal frost heaving force can be reduced and guided downwards, the tower foundation main body is more stable, and the phenomenon that the tower foundation main body is pushed to be inclined or a tower collapse accident is caused by the horizontal frost heaving force is avoided; the segmentation reinforcers are configured to cut soil in the radial direction, so that the upward frost heaving force can be reduced, and the tower foundation body is prevented from being pulled out of the ground through the frost heaving force. An anchoring assembly is arranged on each segmentation reinforcing piece, and the anchoring assemblies are configured to be capable of anchoring the tower foundation body in soil.

The invention discloses a reinforced soil bridge abutment system in a frozen soil area and a construction method of the reinforced soil bridge abutment system. The reinforced soil bridge abutment system comprises a reinforced soil bridge abutment body, a ground source heat pump regulation and control system, a clean energy power supply system and a monitoring system. The reinforced soil bridge abutment body comprises filling soil, rib materials and a prefabricated modular wall face, a buried circulating pipe group of the ground source heat pump regulation and control system deeply penetrates through a frozen soil layer to a stable soil layer, and a heat pump host transfers heat of a bridge abutment base in a high-temperature season to prevent frozen soil from melting by means of a double-circulation pipeline and depending on temperature sensor data and weather forecast data. And reversely supplementing heat in low-temperature seasons to inhibit frost heaving. The heat pump host and the monitoring system of the clean energy power supply system supply power in a time-sharing manner to guarantee core functions. The monitoring system comprises a temperature sensor, a strain gauge and an inclinometer. The problems of stability and frost heaving and thaw collapse of the abutment in the frozen soil area are effectively solved, and economic and social benefits are achieved.

The invention provides a method for constructing an occurrence evolution model of a frozen capillary tube. The method comprises the following steps: step 1, calculating freezing temperature of liquid phase water of any interface; step 2, constructing a freezing model of the capillary tube; step 3, calculating a critical pore diameter change equation of the capillary tube; the larger the critical pore radius RGT is, the smaller the decrease amplitude of the permeability coefficient of the frozen edge is, and the smaller the critical pore radius RGT is, the larger the decrease amplitude of the permeability coefficient of the frozen edge is, and the decrease amplitude is amplified by-beta power. The frost heaving inhibition method comprises the following steps that freezing is carried out after pre-grouting to control the capillary water content, and freezing carried out after pre-grouting specifically comprises the steps that firstly, a grouting pipe is drilled, pore water is replaced with chemical grout, so that a capillary water migration channel is blocked, permeation resistance is increased, then a freezing pipe is drilled, and the capillary water content is controlled by utilizing the low-temperature cementation capacity of ice; and the strength, the deformation modulus and the impermeability of the freezing curtain are improved.