327 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 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 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 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 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 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 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 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 an intelligent digital platform based on cold region highway disaster emergency disposal, and relates to the technical field of cold region highway emergency management. Comprising a cold region highway disaster database and knowledge graph module, an intelligent emergency disposal scheme recommendation module, a dynamic resource allocation module, a data updating and maintenance module, a platform iterative optimization module and a man-machine interaction module. According to the method, by combining the geographical environment and the knowledge graph of the cold region, the recommendation scheme considers the particularity of disasters such as ice and snow, frost heaving and the like, such as snow-melting agent type selection at low temperature, avoiding blind application of a general scheme, improving the disposal accuracy by more than 40%, and by priority ranking and path optimization, the resource arrival time is shortened by 30-50%, resource idling and waste are avoided, and the method is suitable for popularization and application. The emergency cost is reduced by 20%, the efficiency of resource allocation of the platform is improved, and based on user feedback and new technology iteration, the platform can adapt to new disaster types in cold regions, such as road surface frost cracks caused by extreme cold waves, and the practicability is kept for a long time.

The invention discloses a construction method for a variable-pile-length anti-pulling bearing system of a concrete precast pile in a frozen soil foundation, and relates to the technical field of engineering construction, and the construction method comprises the following steps: S1, carrying out frozen soil foundation profile mechanical distribution identification and pile length initial section division; s2, an optimized segmentation model used for reflecting the influence of pile length changes on the pulling resistance is constructed; s3, constructing a pile section critical pulling resistance prediction model; s4, identifying a potential local overrun region, and constructing an anti-pulling risk model; s5, adjusting the material structure configuration of each pile section; and S6, verifying the adjusted material structure configuration. According to the method, fine analysis of stress conditions of different pile sections in the freezing environment is achieved by dividing the initial section of the pile length and introducing the optimized segmentation model, so that the pulling resistance of the pile sections can be matched with actual frost heaving force distribution; by means of a linkage simulation mechanism of an anti-pulling risk model and a structure freezing response function, a set of complete structure enhancement verification path is constructed.

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 discloses a roadbed construction control method and system for frost heaving and thaw collapse characteristics of a frozen soil layer, and relates to the technical field of roadbed construction control. Comprising the following steps: collecting different land types, construction control parameters and frozen soil layer characteristic parameter data, and recording corresponding frozen layer ice phase volume time sequence data; establishing a neural network prediction model based on the data set, inputting a land type, construction parameters and frozen soil layer characteristics, and outputting an ice phase volume prediction value; relevant parameters of a road to be constructed are collected and input into the model, and frozen layer ice phase volume time sequence data prediction is obtained. Analyzing the influence of soil structure characteristics and construction environment parameters on frost heaving and thaw collapse characteristics, correcting initial values of construction control parameters, and judging whether frozen soil layer conditions meet construction requirements or not; and finally, fixed control parameters are corrected based on temperature strain, and roadbed construction is completed through real-time adjustment. And the construction safety and efficiency under the complex frozen soil condition are effectively improved.

The invention discloses a damage quantitative diagnosis method and a freeze-thaw process monitoring method for a dangerous rock mass crack freeze-thaw process in a cold and cold mountainous area. Aiming at the defect that in the prior art, dangerous rock body risk investigation only relates to a crack freezing expansion stage, the invention provides a freeze-thaw whole-process diagnosis method, different states of a crack water-ice medium are taken as measurement objects, and different comprehensive stresses of crack contact surfaces are analyzed; and a measurement route for judging, widening, releasing energy and rubbing along the local stress and strength factors is established. According to physical states and deformation trends of media in different environments, stress measurement starting points can be divided into bottom end contact surface stress and frost heaving stress. The method is a dangerous rock damage quantitative diagnosis technology suitable for the four stages of complete ablation, freezing, complete freezing and thawing in the whole period of the freezing and thawing process, and suitable iteration quantitative diagnosis conditions are designed. The invention further provides a technical scheme for monitoring the freezing and thawing process of the dangerous rock mass in the cold and cold mountainous area, and further comprises rock mass instability and caving risk assessment.

The invention provides a test device for testing lateral frost heaving force and displacement of frozen soil. Comprising a support fixing device, a sample cylinder fixed in the support fixing device, a plurality of first test assemblies arranged at intervals along the height direction of the sample cylinder and used for measuring lateral frost heaving displacement and lateral frost heaving force of frozen soil, and a plurality of second test assemblies arranged at intervals along the height direction of the sample cylinder and used for measuring vertical frost heaving displacement of the frozen soil, and the temperature control device is positioned on the bracket fixing device. The multiple first test assemblies are arranged at intervals in the height direction of the sample cylinder and used for measuring lateral frost heaving force and displacement at different height positions, and the multiple first test assemblies are arranged on the other side of the sample cylinder in the height direction and used for measuring vertical frost heaving displacement at different heights. The method is of great significance in engineering construction and frozen soil frost heaving theoretical research.

The invention relates to the technical field of cold region rock mass and cold region tunnel engineering, and discloses a cold region tunnel frost heaving force calculation method under multi-factor random coupling. Comprising the following steps: S1, comprehensively considering the coupling effect of main frost heaving influence factors such as tunnel operation age limit, lining local cavity or defect, surrounding rock porosity and water content condition on the frost heaving force of the tunnel in the cold region; s2, a cold region tunnel frost heaving force calculation formula system under multi-factor random coupling is constructed, and cold region tunnel frost heaving is divided into a single-factor leading frost heaving type, a double-factor coupling frost heaving type and a three-factor coupling frost heaving type; and S3, selecting a corresponding calculation formula of the frost heaving force of the tunnel in the cold region according to different frost heaving types for solving. The method for calculating the frost heaving force of the tunnel in the cold region under multi-factor random coupling, provided by the invention, is suitable for various different types of tunnels in the cold region, has wide applicability, provides a scientific basis for design, construction and maintenance of the tunnel in the cold region, and is beneficial to improving the safety and stability of the tunnel.

The present application relates to the technical field of electric digital data processing, in particular to a numerical method and system for analyzing stress field of tunnel frozen soil curtain based on finite element, which obtains a three-dimensional model of a tunnel construction site and geological material characteristic data; performs grid division on the three-dimensional model to obtain a finite element grid model of the three-dimensional model; performs stress simulation on the finite element grid model based on the geological material characteristic data to obtain an initial stress field of the finite element grid model before freezing; analyzes the trend of change of soil density in the freezing process based on the stress distribution of each unit grid in the initial stress field in the finite element grid model to determine a frost heaving stress field of the finite element grid model; and superimposes the initial stress field and the frost heaving stress field to determine a comprehensive stress field of the finite element grid model. The present application effectively improves the accuracy of analyzing stress field of tunnel frozen soil curtain.