57 results about "Permafrost" patented technology

The invention discloses a permafrost hydrothermal state simulation method and system based on a physical model, and relates to the technical field of permafrost region engineering. The method comprises the following steps: acquiring meteorological driving data and land surface feature data; constructing a numerical model of a permafrost hydrothermal process by considering a permafrost freezing and thawing process and a soil ice effect by utilizing land surface feature data; preparing boundary constraint conditions of the numerical model according to the meteorological driving data and the existing temperature field data; and performing permafrost hydrothermal state simulation on the land surface characteristic data by using meteorological driving data, constraint condition data, key vegetation and soil parameters and a driving numerical model to obtain a sample set formed by key permafrost hydrothermal information. According to the method, the dependence of an existing model on data and structures is broken through, the multi-scale application requirement of the permafrost region is met, and finally a high-quality meteorological driving and boundary constraint condition data set suitable for permafrost simulation without an observation region can be generated.

The invention discloses a frozen soil upper limit intelligent identification method based on multi-source data and deep clustering fusion, and belongs to the technical field of frozen soil exploration. The method comprises the following steps: firstly, collecting and preprocessing ground penetrating radar and high-density electrical method data, and registering with drilling data; constructing a sample data set by using a sliding window; constructing a double-branch convolutional auto-encoder to carry out unsupervised pre-training so as to fuse multi-source data features; on the basis, a clustering layer is introduced, a joint loss function combining reconstruction loss, clustering loss and supervision loss is adopted, semi-supervised deep clustering optimization is carried out, and underground media are divided into three types including a covering layer, a transition zone and frozen soil; and finally, automatically identifying the frozen soil upper limit depth of each point on the measuring line by using the trained model, and outputting a confidence coefficient. According to the method, the problems that a traditional method depends on artificial experience and is low in efficiency are solved, and intelligent, high-precision and high-efficiency identification of the frozen soil upper limit is achieved.

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 tunnel surrounding rock supporting, in particular to a high-altitude permafrost region shallow tunnel soft rock supporting system and a construction method thereof. The supporting system comprises a temperature-adaptive stable protection composite arch frame structure, and the temperature-adaptive stable protection composite arch frame structure comprises a rigid outer protection temperature adjusting layer, an elastomer component and an arch frame. The rigid outer protection temperature adjusting layer comprises a steel protection layer, a heat preservation layer and a temperature adjusting layer which are sequentially arranged from outside to inside in the radial direction. The elastomer component comprises an elastic piece and a buffer layer, the two ends of the elastic piece abut against the inner side of the rigid outer protection temperature adjusting layer and the outer side of the arch frame respectively, and the space between the rigid outer protection temperature adjusting layer and the arch frame is filled with the buffer layer. Through temperature regulation and control and self-adaptive deformation capacity of the temperature-adaptive stable protection composite arch frame structure, dynamic adaptation of a supporting system to freeze-thaw deformation, temperature fluctuation and complex geological conditions is achieved, and tunnel construction safety and long-term stability are improved.

The invention discloses a permafrost evolution state evaluation method based on single-hole ground temperature, and the method is characterized in that the method comprises the following steps: 1, collecting single-hole ground temperature data; 2, effective negative temperature is determined, 3, space-time integration is conducted on the effective negative temperature, and space-time negative accumulated temperature is obtained; 4, selecting a reference year, and calculating the space-time negative accumulated temperature of the reference year; 5, calculating the space-time negative accumulated temperature of the target year, and calculating a frozen soil state index; and 6, judging the evolutionary or degenerative state of the frozen soil according to the frozen soil state index. According to the evolutionary state evaluation method for the permafrost based on the single-hole ground temperature, the original space curve of the ground temperature changing along with depth and time is converted into the integral quantity value capable of representing the thermal state characteristics of the permafrost, so that ground temperature data can be effectively integrated, and the integrity and reliability of the data are improved; and quantitative evaluation of the evolutionary trend of the permafrost can be realized, and the method can be widely applied to cold region environments and engineering practices under different regions and conditions.

The invention discloses a permafrost railway roadbed structure design method based on a high-power flexible hot rod, which comprises the following steps: measuring the thermal conductivity and the volumetric heat capacity of permafrost through in-situ drilling and indoor test, and constructing a three-dimensional permafrost thermal state model in combination with geological radar and ground temperature gradient data; calculating to obtain a frozen soil thermal stability index, and dividing the frozen soil area into refrigeration grades according to the frozen soil thermal stability index; aiming at the permafrost with different refrigeration grades, designing corresponding refrigeration parameters of the flexible hot rod; a corresponding roadbed structure is designed according to the refrigeration parameters of the flexible hot rod; under different working conditions, a hot rod refrigerating capacity attenuation rate test is performed, a hot rod power ground temperature feedback control model is established based on test data, and refrigerating parameters of the flexible hot rod are dynamically adjusted. Through the high-power flexible hot rod, the three-dimensional data model, hierarchical design, dynamic feedback control and other technologies, the refrigerating capacity and the space coverage uniformity can be effectively improved, and the operation and maintenance cost is greatly reduced.

This invention relates to the field of permafrost coring technology, and particularly to a permafrost coring device, coring system, and coring method. The device includes: a support and fixing module, a coring module, a protective chamber, a monitoring module, a compensation module, and a control module. The coring module includes a coring ejector, a coring chamber, and a drill bit assembly. A door is provided at the bottom of the protective chamber. The monitoring module is used to detect the temperature and pressure of the coring chamber and the protective chamber. The compensation module is connected to an external compensator and is used to compensate for the temperature and pressure of the coring chamber and the protective chamber based on the detection results of the monitoring module. The control module is used to control the working status of the coring ejector, the drill bit assembly, the door, the monitoring module, and the compensation module according to instructions from a control terminal, so as to maintain the in-situ temperature and pressure of the coring chamber and the protective chamber during the process of moving to the target location in the permafrost, ejecting the coring sample, and completing the coring process.

The present invention relates to the field of permafrost monitoring technology, and in particular to a thermodynamic tracking method and system for phase change of water storage in permafrost areas, comprising: obtaining spatiotemporal distribution data and temperature data of soil conductivity in a study area; correcting the temperature data based on the spatiotemporal distribution data of soil conductivity; constructing a topological mapping framework to calculate ice-water phase change latent heat data; constructing a nonlinear dynamic model to track the latent heat evolution process; calculating the moisture content and water storage of the active layer; deducing the freeze-thaw state of the active layer; and providing early warning of possible environmental disasters. Through innovative methods such as multi-source data fusion, topological dynamics modeling, and multi-scale spatiotemporal coupling, the temperature monitoring accuracy is improved by 30% to 50%, the moisture content derivation accuracy is improved by 40% to 60%, the water storage prediction accuracy is improved by 35% to 55%, and the early warning time is extended from the traditional 24 to 48 hours to 7 to 14 days, providing a powerful tool for environmental monitoring and disaster prevention in permafrost areas.

The present application relates to a kind of device for quickly estimating the content of permafrost block ice, which includes a closed cubic test space formed by side plate, bottom plate and cover plate. The center of the cover plate is inlaid with an infrared imager; the inside of the closed cubic test space is provided with a fixed constant temperature cold source, and the upper part of the fixed constant temperature cold source is provided with a frozen soil sample; the upper part of the frozen soil sample is provided with a movable constant temperature cold source, and a pair of constant temperature cold source handles are symmetrically arranged on both sides of the movable constant temperature cold source; the outside of the closed cubic test space is provided with a circulating pump, a constant temperature liquid storage tank and a cooling chamber connected together through pipes; the output end of the circulating pump is connected with the injection inlet of the movable constant temperature cold source and the fixed constant temperature cold source respectively; one end of the cooling chamber is connected with the outlet of the movable constant temperature cold source and the fixed constant temperature cold source respectively. At the same time, the use method of the device is also disclosed. The present application can be sampled on site to realize rapid testing, and reduce the cost of sample low-temperature transportation.

This invention discloses a non-destructive method for determining the dielectric constant of undisturbed permafrost, belonging to the technical field of permafrost dielectric property measurement. The method includes: experimentally measuring the dielectric constants of single-phase dry soil, pure water, and ice in undisturbed permafrost; non-destructively obtaining the porosity of undisturbed permafrost specimens; establishing calculation formulas for the volume ratios of ice, unfrozen water, and soil with respect to unfrozen water content and porosity, respectively; preparing a series of frozen specimens with different porosity ratios using thawed soil samples from the same source as the undisturbed permafrost; experimentally measuring the unfrozen water content at different sub-zero temperatures, obtaining a bivariate prediction model through quadratic fitting, and outputting the unfrozen water content corresponding to any temperature and porosity, thereby obtaining the volume ratios of ice, unfrozen water, and soil; and obtaining the overall dielectric constant of the same type of permafrost in the same region at a fixed temperature using a three-phase dielectric mixing model or a deep neural network model. This invention improves testing accuracy without damaging the permafrost structure.

The application discloses a kind of high altitude permafrost engineering disturbance area's vegetation recovery method, comprising the following steps: to meet sowing time period, turn over, supplement grass seed, sowing time period is: deep 0 cm place consecutive 10 days daily average ground temperature value is not less than first preset temperature value and deep 50~60 cm place consecutive 12 daily average ground temperature value is not less than second preset temperature value after the deadline 3~10 days;Cover multilayer covering net, until deep 0 cm place consecutive 8 days average ground temperature value is not less than third preset temperature value, remove part of covering net, only remain a layer of covering net;When grass seedling grows to 5~8 cm, remove last layer of covering net.The application is limited by the daily average ground temperature value of deep 0 cm in frozen soil disturbance area and deep 50~60 cm in frozen soil disturbance area, which helps to keep the endosperm cells inside active after seed sowing, increases the germination rate of grass seeds, and has good vegetation recovery effect.

The invention relates to a device for quickly estimating the content of massive ice in permafrost. The device comprises a closed cubic test space formed by side plates, a bottom plate and a cover plate. An infrared imager is embedded in the center position of the cover plate; a fixed constant-temperature cold source is arranged in the closed cubic test space, and a frozen soil sample is arranged above the fixed constant-temperature cold source; a movable constant-temperature cold source is arranged above the frozen soil sample, and a pair of constant-temperature cold source handles are symmetrically arranged on the two sides of the movable constant-temperature cold source; a circulating pump, a constant-temperature liquid storage tank and a cooling chamber which are sequentially connected in series through a pipeline are arranged outside the closed cubic test space; the output end of the circulating pump is respectively connected with injection ports of the movable constant-temperature cold source and the fixed constant-temperature cold source; and one end of the cooling chamber is respectively connected with the outlet of the movable constant-temperature cold source and the outlet of the fixed constant-temperature cold source. Meanwhile, the invention further discloses a using method of the device. The device can be used for on-site sampling to realize rapid testing, and the low-temperature transportation cost of the sample is reduced.

The application relates to the technical field of mineral exploration, and in particular to a multi-modal mineral prediction agent cooperation method and system based on LLM dynamic perception. The method comprises the following steps: acquiring surface multi-modal data of a permafrost layer mineral, analyzing the interaction between a surface methane-loving bacterial community structure and permafrost respiration gas in the permafrost layer above the mineral based on the surface multi-modal data, and obtaining a permafrost microorganism-gas coupling information set; based on the permafrost microorganism-gas coupling information set, simulating the migration path of the gas in the heterogeneous permafrost through an LLM generator, associating and mapping the migration path with the mineral type, and obtaining a mineral characteristic inference set; based on the mineral characteristic inference set, positioning the methane seepage and the microbial hotspot area through a discriminator, generating a grid sampling-fixed point deep digging cooperation decision, and outputting a multi-modal mineral prediction agent cooperation log of minimum invasion operation. The balance between accurate target positioning and minimum environmental invasion is achieved, and the reliability of mineral prediction is improved.

The invention belongs to the technical field of buildings, and relates to a construction method of an ice layer head-expanding self-locking anchor rod, which comprises the following steps of: S1, forming a drill hole (8) by using a drill bit, and enabling the drill hole (8) to penetrate through an accumulated snow and freeze thawing layer (6) and then penetrate into a perpetual freezing ice layer (7); s2, an ice layer head-expanding self-locking anchor rod is inserted into the drill hole (8), the ice layer head-expanding self-locking anchor rod comprises an anchor rod body (1) and a head-expanding device (2) arranged at the lower end of the anchor rod body (1), and the head-expanding device (2) is located in the bottom of the drill hole (8); s3, the drill hole (8) is filled with water; and S4, after irrigation water is frozen, a connecting part (1-1) reserved at the top of the anchor rod body (1) penetrates through a reserved hole of a foundation and is connected with the foundation, and construction of the ice layer head-expanding self-locking anchor rod is completed. No cementing material is adopted, pouring and maintenance are not needed, construction is convenient and fast, materials are light and convenient to transport and carry, and on-site zero pollution is achieved.

The invention relates to the technical field of frozen soil area monitoring, in particular to a thermodynamic tracking method and system for phase change of water reserves in a frozen soil area, and the method comprises the steps: obtaining soil conductivity spatial and temporal distribution data and temperature data of a research area; based on the soil conductivity spatial and temporal distribution data, correcting the temperature data; constructing a topological mapping framework, and calculating ice water phase change latent heat data; constructing a nonlinear kinetic model, and tracking a latent heat evolution process; calculating the water content and the water reserve of the active layer; deducing the freeze-thaw state of the active layer; possible environmental disasters are early warned; through innovative methods such as multi-source data fusion, topological dynamics modeling and multi-scale space-time coupling, the temperature monitoring precision is improved by 30%-50%, the water content derivation precision is improved by 40%-60%, the water reserve prediction precision is improved by 35%-55%, the early warning time is prolonged to 7-14 days from traditional 24-48 hours, and a powerful tool is provided for frozen soil area environment monitoring and disaster prevention and control.

The invention relates to the technical field of hydrology, and discloses a regulation and storage function evaluation method for a hot melt lake and pond in a high and cold frozen soil region, and the method comprises the steps: obtaining multiple types of monitoring data of a target permafrost region drainage basin, carrying out the correction and unified time processing, and carrying out the division of an effective rainfall event and an event window; in the event window, calculating a soil reserve variable quantity, an underground water reserve variable quantity and a hot melt lake and pond reserve variable quantity; calculating a normalized water storage efficiency index; acquiring a hysteretic curve, a peak time lag, a hysteretic loop area, a dynamic connectivity index and a statistical connectivity index; according to the hysteretic curve, judging a function mode of the hot melting pond, and dividing a rainfall threshold value of function conversion of the hot melting pond; comprehensive regulation and storage indexes are calculated, regulation and storage capacity analysis is carried out, and regulation and storage function evaluation of the hot melt lakes and ponds is achieved; according to the method, not only can water storage, water supply and storage regulation behaviors of the hot melting pond under the event scale be finely identified, but also the dynamic hydrological function of the hot melting pond can be accurately evaluated.

The invention discloses a screw anchor foundation frost heaving prevention early warning method and system, and belongs to the technical field of geotechnical engineering safety monitoring. According to the method, basic data are collected through temperature, frost heaving force and displacement sensors on a screw anchor structure, and analog signals are converted into digital signals through a data collection module; the data transmission module transmits the data to the data analysis and processing module, and basic quantization parameters such as the temperature change rate and the temperature gradient are calculated through a set algorithm; in combination with set historical data, analyzing by using a machine learning model to obtain a frost heaving risk level; the early warning module performs graded early warning according to the risk grades; and finally, storing the basic data, the quantitative parameters and the risk levels in a classified manner, and establishing a data index. Accurate monitoring and early warning of the frost heaving risk are achieved, the engineering safety and operation and maintenance efficiency of the spiral anchor foundation in the frozen soil area are improved, and the method is suitable for engineering scenes such as wind power and power transmission.

The utility model provides a frozen soil layer water feeding sampling tool which comprises a holding assembly and a sampling assembly, the holding assembly comprises an outer sleeve and a sliding piece, and the sampling assembly comprises a sampling pipe and a piston piece; according to the utility model, the holding assembly which can be held by an operator is arranged, the sliding piece is movably arranged in the outer sleeve, the sampling assembly can be mounted in the holding assembly, the sampling tube is fixed in the outer sleeve, and the sliding piece is connected with the piston piece; during use, water on a frozen soil layer can enter the sampling pipe by pulling the sliding piece, the sampling assembly is taken out from the holding assembly after collection is completed, and a collected water sample can be recycled by pushing the piston rod. Therefore, the water sampler can be matched with a soil auger for use, so that the water sampling process is more convenient, and the water sampler is applicable to sampling work of a deeper soil profile; one sampling point can be replaced and corresponds to one collecting pipe, so that water samples at different points are prevented from being polluted; meanwhile, the device is low in price, convenient to carry and suitable for field long-time sampling.

The invention discloses a dielectric constant lossless determination method for undisturbed permafrost, and belongs to the technical field of permafrost dielectric property determination, and the method comprises the following steps: testing to obtain the dielectric constants of single-phase coherence soil, pure water and ice in the undisturbed permafrost; losslessly obtaining the void ratio of the original permafrost test piece; establishing a calculation formula of the volume ratio of ice, unfrozen water and soil mass about the unfrozen water content and void ratio; the method comprises the following steps: preparing a series of frozen test pieces with different void ratios by using a thawed soil sample homologous with undisturbed frozen soil; under different negative temperatures, the unfrozen water content is measured through experiments, a double-variable prediction model is obtained through quadratic fitting, the unfrozen water content corresponding to any temperature and void ratio is output, and therefore the volume ratio of ice to unfrozen water to soil is obtained; and obtaining the overall dielectric constant of the same type of frozen soil in the same region at the fixed temperature through a three-phase dielectric hybrid model or a deep neural network model. The test precision is improved while the frozen soil structure is not damaged.

The invention relates to the technical field of frozen soil engineering equipment detection, in particular to a thermal rod performance self-display measuring system and a quantitative evaluation method, and the system comprises a thermal rod, a liquid industrial sensing unit, a measuring unit and a temperature sensing unit; the liquid industrial sensing unit comprises a floating ball and a sliding support, the vertically-arranged sliding support is fixed to the center of the inner side of the hot rod, the floating ball is slidably connected to the outer side of the lower portion of the sliding support, and a measuring unit is arranged on the hot rod; according to the invention, the liquid working medium induction unit, the measuring unit and the temperature induction unit are arranged to measure the stock of the liquid working medium and the temperature of the hot rod, so that the hot rod can be accurately, rapidly and quantitatively detected; the problem that the hot rod cannot be accurately, rapidly and quantitatively detected under the complex extreme environment condition in the field in the frozen soil region of the Qinghai-Tibet Plateau and the like for many years is solved, the problem that detection can only be carried out in winter or even under the working condition of the hot rod at night in winter by an existing detection method is solved, and the detection efficiency and accuracy of the hot rod are improved.

The invention discloses an active ice melting method and system for frozen soil of a high-ice-content frozen soil foundation. The method comprises the steps that S1, the position and the thickness of a high-ice-content frozen soil layer in a stratum are determined; s2, according to the position and the thickness of the high-ice-content frozen soil layer in the stratum, at least one center water injection vertical shaft and a plurality of water extraction vertical shafts formed around the center water injection vertical shaft are formed in the high-ice-content frozen soil foundation, and layered and fixed-point high-pressure hydraulic fracture forming is carried out in the center water injection vertical shaft, so that the high-ice-content frozen soil layer is obtained; enabling the crack to horizontally expand in the frozen soil layer until the crack is communicated with the water extraction vertical shaft to form a circulating convection field so as to melt frozen soil; s3, water injection is stopped, and foundation reinforcing slurry is injected into the settled and compacted soil body; and S4, backfilling the upper part of the settled earth surface area with filler layer by layer to a designed elevation. According to the method, the high-ice-content thermally unstable foundation can be safely and controllably reconstructed into the thermally stable composite foundation which meets engineering requirements and is high in bearing capacity.

The application provides a high-temperature unstable permafrost pre-melting and vacuum preloading reinforcement system and a reinforcement method, and the system comprises a pre-melting and thawing device, a sealing system and a steam generator, and the sealing system and the steam generator are connected with the pre-melting and thawing device. The pre-melting and thawing device is matched with the steam generator, the high-temperature unstable permafrost is pre-melted by using steam convection and heat conduction, the pre-melting and thawing efficiency is improved, the system has the characteristics of green environmental protection, and has no adverse effect on subsequent engineering construction. The sealing system is matched with the pre-melting and thawing device to realize the drainage consolidation of the high-temperature unstable permafrost foundation, the thawing pipe and the soil body are prevented from being empty, the pre-melting and thawing efficiency is ensured, the uneven subsidence problem caused by repeated freezing and thawing cycles is eliminated, the bad properties of the frozen soil are changed, and the stability of the foundation is effectively improved.

The application belongs to the field of cold region road engineering design method and frost damage prevention and control technology, and proposes a phase change energy storage differentiation configuration method suitable for permafrost and seasonal frozen soil highway subgrade types. The method first determines the frozen soil type according to the ground temperature field and freezing depth and other indexes, then combines different engineering goals required for permafrost thawing and thermal stability and seasonal frozen soil thawing and freezing depth control, realizes the systematic matching of phase change energy storage materials, structure configuration and key parameters through the steps of temperature zone matching, configuration selection, parameter combination, verification iteration and other steps, establishes the ternary mapping relationship of frozen soil type-engineering goal-technical route, improves the applicability and stability of the phase change energy storage temperature control measures under different frozen soil types, and the configuration scheme can be replicated and verified, which is conducive to the standardization of design and popularization, and can effectively improve the comprehensive effect of subgrade thermal stability and deformation control.

The present application relates to the technical field of climate monitoring, and specifically includes a permafrost and climate coupling response model based on multi-source data, a dynamic degradation threshold set according to permafrost types, timely triggering of risk reminders and labeling of abnormal regions, and improved permafrost degradation risk identification accuracy.

A constitutive model and parameter calibration method for permafrost considering temperature and time effects are proposed, including: construction of the basic model framework; laboratory experiments and construction of core equations; construction of elastoplastic constitutive relations; construction of stress-strain relations considering temperature and time effects; and inversion calibration of model parameters. Through the progressive and synergistic implementation of the above steps, this method realizes a systematic R&D process from theoretical framework to experimental verification and then to parameter calibration, effectively solving the problem of modeling the complex mechanical behavior of permafrost under the coupled effects of temperature and time.

This invention discloses a heat pipe-type insulated sampling drill bit and method for drilling polar ice cores and natural gas hydrates in terrestrial permafrost regions. The drill bit includes a double-walled drill rod, a refrigerant storage chamber, a direct-heating pipe, a spiral heat pipe, and a drill bit. The double-walled drill rod comprises an inner tube and an outer tube with an annular gap between them; the inner wall of the drill rod serves as a core sampler. The refrigerant storage chamber is located at the upper end of the drill rod and is filled with liquid nitrogen; a high-pressure air inlet is located at the upper end of the refrigerant storage chamber. The direct-heating pipe is located at the lower end of the refrigerant storage chamber and is situated within the annular gap of the drill rod. The spiral heat pipe is located at the lower end of the direct-heating pipe and is connected to it; the spiral heat pipe is situated within the annular gap of the drill rod and is filled with Freon. The drill bit is located at the lower end of the drill rod. This invention offers high sample collection efficiency and minimizes disturbance to the original state of ice cores and natural gas hydrates.

The invention discloses a permafrost refrigeration system control method based on a cold load, and belongs to the technical field of permafrost protection measures, and the method comprises the following steps: 1, predicting the cold load of a permafrost protection work site; secondly, a refrigerating system control module based on the cooling load is constructed. Intelligent control over the operation process of the refrigerating system is achieved through an intelligent algorithm, and the dual purposes of permafrost temperature control and refrigerating system energy saving are achieved. The permafrost cold load is predicted based on a machine learning model, a refrigeration system control module based on the cold load is constructed, the control module effectively integrates geological information and meteorological information of different time scales, the dynamic adaptability to key influence factors of permafrost degradation is improved, and the advantages of being high in generalization ability, energy-saving, efficient and the like are achieved; and according to the cold load prediction and feature recognition result, the control strategy of the refrigeration system is adjusted in time, a control instruction is generated, and therefore the permafrost intelligent protection method with the environment self-adaption function is achieved.

The invention provides an anti-frost heaving method and system for a salinized permafrost railway tunnel. The method comprises the steps that the coldest month average temperature of the place where the tunnel is located and the portal types of tunnel entrances and exits are obtained; determining a tunnel anti-frost heaving fortification scheme according to the coldest month average temperature of the location of the tunnel and the entrance types of the tunnel entrances and exits; analyzing the tunnel anti-frost heaving fortification scheme, and if the tunnel anti-frost heaving fortification scheme comprises a lining structure design scheme, supplementing and modifying the lining structure design scheme according to the type of an ice layer where a tunnel lining base is located. According to the method, the average temperature of the coldest month and the hole thermophysical characteristics are coupled and analyzed, and a graded fortification system is established. Differentiated fortification lengths are accurately determined according to the air temperature and the types of the holes, fortification of the low-end holes is strengthened, optimization design of the high-end holes is achieved, and unification of safety and economical efficiency is achieved. A comprehensive protection system is formed through lining reinforcement, active drainage, whole-course heat preservation and foundation treatment, and the long-term stability of the tunnel is remarkably improved.

The present invention discloses a method and system for detecting the spatial distribution of underground ice in permafrost areas of the Qinghai-Tibet Plateau. The method comprises the following steps: obtaining resistance information of underground ice in permafrost areas; obtaining spatial distribution information of underground ice in permafrost areas based on the resistance information; and generating a detection image based on the spatial distribution information of underground ice in permafrost areas; acquiring the underground distribution image of the permafrost areas using radar; generating a spatial distribution report of underground ice in the permafrost areas; establishing a dataset based on the spatial distribution report and constructing a permafrost area underground distribution detection model; training and testing the permafrost area underground distribution detection model; and inputting the spatial distribution report of underground ice in the permafrost areas into the trained and tested permafrost area underground distribution detection model to obtain detection results of the spatial distribution of underground ice in permafrost areas of the Qinghai-Tibet Plateau. The method utilizes an intelligent ground resistance meter and radar device to improve the accuracy of underground ice distribution detection in permafrost areas of the Qinghai-Tibet Plateau. Real-time updates of the distribution report improve the detection accuracy of the model and the accuracy of the detection results.

The present application relates to the field of cold region tunnel freeze damage prevention and control, and particularly relates to a full permafrost tunnel drainage system based on suction type heating. The system comprises two heat preservation water channels, the heat preservation water channels are arranged along the full length of the two sides of the tunnel, and the four walls of the heat preservation water channels are provided with heat preservation layers; a plurality of drainage systems, wherein the circumferential blind pipes are arranged circumferentially along the tunnel arch wall, the bottoms are communicated with the heat preservation water channels through longitudinal blind pipes and horizontal water guide pipes, and are used for guiding and discharging the seepage water of the surrounding rock, and the plurality of drainage systems are distributed at the set positions of the tunnel; a plurality of heating devices, part of the heating devices are arranged at the top of the tunnel and are used for heating the circumferential blind pipes, and the remaining part of the heating devices are arranged at one side of the heat preservation water channels and are used for heating the set positions of the heat preservation water channels, in other words, the plurality of drainage systems and the plurality of heating devices cooperate to carry out fixed-point concentrated heating on the drainage of the permafrost section in the tunnel hole, the upper limit of the permafrost layer and the shady place of the tunnel entrance, so as to ensure that the tunnel drainage system is unobstructed and is not easy to freeze.