315 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.