19 results about "Soil frost" patented technology

The invention discloses a numerical simulation method for a soil frost heaving rule. The simulation method specifically comprises the following steps: S1, constructing a model for calculation according to a soil frost heaving model; s2, correlating a temperature field model and a moisture field model; and S3, obtaining the optimized hydrothermal coupling model. According to the invention, model calculation is established based on the soil frost heaving model, a temperature field and a moisture field are respectively established and then are secondarily integrated into an overall model, and then consideration of a displacement field is added, so that the calculation efficiency of the overall model is increased, and meanwhile, an actual model calculation structure is similar to soil frost heaving parameters under actual working conditions; finally, simulation of actual working conditions can be completed based on the method before construction, a construction scheme formulated in the early stage is optimized based on a simulation conclusion, and the construction period and cost of the construction process are optimized while safety is guaranteed.

The invention provides a power grid multi-disaster coupling strength calculation method and system, and relates to the technical field of power emergency, and the method comprises the steps: collecting the weather forecast data of a target power transmission channel and the real-time operation parameters of a power grid; analyzing weather forecast data, and configuring virtual monitoring points at the midpoint of an ice-prone section of a line, the tower top of a tower in a thunder and lightning frequent area and the geometric center of a tower foundation in a soil frost heaving sensitive area; generating a dynamic feature point set based on the virtual monitoring points; analyzing real-time operation parameters of a power grid, and collecting an equipment state feature point set at monitoring points at four corners of a tower foundation platform, a joint of an insulator steel foot and a hanging point and an outlet of a wire strain clamp; and extracting a data point sequence with time-space continuous evolution characteristics in the dynamic characteristic point set as a core trajectory for constructing the three-dimensional dynamic ellipsoid. The method can improve the dynamic nature and accuracy of power grid risk assessment under the disaster chain effect, and guarantees the safe operation of a power transmission channel.

The application discloses a kind of anti-frost heaving pile foundation for installing photovoltaic support in frozen soil area and its construction method, belong to frozen soil area pile foundation technical field.The anti-frost heaving pile foundation includes photovoltaic support, prefabricated pipe pile, support connecting section, anti-frost heaving section and fixed section, support connecting section is located above prefabricated pipe pile for connecting photovoltaic support and pile foundation;Anti-frost heaving section is filled with anti-frost heaving material to eliminate the influence of soil frost heaving on engineering, and plays the role of anti-soil frost heaving;Fixed section is located at the lower end of prefabricated pipe pile to improve pile body stability and uplift resistance;The construction method includes: hole digging, hole cleaning, pouring core concrete, installing pile shoe positioner, vibration pile planting, installing centering positioner, filling anti-frost heaving material, sleeve and pouring filling core concrete etc.The application solves the problem of time and labor consumption of the original pile around frost heaving soil replacement technology, and the use of prefabricated pipe pile can save the time spent on pile maintenance, thereby speeding up the construction progress.

The invention provides a multi-dimensional multi-field coupling high-pressure frozen soil frost heaving and thaw collapse test device, which belongs to the technical field of frozen soil, and comprises a loading frame, a loading system, a water replenishing system, a temperature control system, a control system, a test box and a sensor group electrically connected with the control system, the temperature control system comprises a multi-channel temperature adjusting control device, a thermostatic bath A, a thermostatic bath B and a thermostatic water tank which are electrically connected with the control system, the thermostatic water tank comprises a plurality of thermotanks which are sequentially arranged from bottom to top, and the thermostatic bath A and the thermostatic bath B are communicated with the multi-channel temperature adjusting control device through pipelines. The multi-channel temperature regulation control device is respectively communicated with the plurality of thermotanks through pipelines with valves, and the plurality of thermotanks are respectively communicated with the thermostatic bath A and the thermostatic bath B through pipelines with peristaltic pumps. According to the invention, frost heaving and thaw collapse behaviors of frozen soil under different environmental conditions can be evaluated more comprehensively, and more real and reliable test data can be provided.

The utility model relates to the technical field of frozen soil detection, and discloses a directly-buried frozen soil frost heaving force in-situ testing device which comprises a pre-buried cylinder, a measuring through groove is formed in the outer periphery of the pre-buried cylinder, and a motor is installed at the top of an inner cavity of an installation cylinder; the driving gear is coaxially connected to the bottom end of the motor, a transmission gear is inserted in the position, corresponding to the driving gear, of the left side of the interior of the mounting cylinder through a bearing, the lower side of the exterior of the mounting cylinder is sleeved with a clamping ring, and an assembling ring frame is inserted in the clamping ring; and the gear ring is installed at the top end of the assembly ring frame, and a pressure sensor is inserted into the installation ring. According to the direct-buried frozen soil frost heaving force in-situ testing device, a motor drives a driving gear to rotate, so that a transmission gear can drive a gear ring to rotate, the circumferential angles of a mounting ring and a pressure sensor can be adjusted, and the pressure sensor can capture the change of frost heaving force at different angles; this helps to obtain more comprehensive and accurate data.

The invention discloses a model system based on a soil frost heaving rule, and the system comprises a soil detection module which comprises a soil temperature measurement unit and a soil cooling unit, and is used for testing the cooling performance of sampled target soil, and building a preliminary linear system model; the model optimization module comprises a data acquisition system, a model test box and a freezing refrigeration box; and the model detection module comprises a temperature sensor, a displacement sensor, a freezing pipe and a liquid separation pipe. The model system is formed according to the site construction environment by proposing the corresponding calculation model, preliminarily collecting the site data, optimizing the target model and finally constructing the model system, and the system has reproducibility according to the calculation model and can deal with soil frost heaving simulation in different construction environments.

The present invention relates to the technical field of road soil testing, and specifically discloses a soil frost heave deformation test system, which includes a base plate. A turntable is rotatably connected to the base plate. A plurality of sliding grooves are provided on the turntable. A slider is slidably connected in each sliding groove. A first spring is fixedly connected between the slider and the sliding groove. A suspension pipe is fixedly connected to each slider. An arc-shaped plate is fixedly connected to the lower end of the suspension pipe. A plurality of arc-shaped plates can be spliced into a circular pipe. A first cold source cavity is provided on each arc-shaped plate. A base pipe is fixedly connected to the center of the turntable. A suspension rod is slidably connected in the base pipe. A pressing plate is fixedly connected to the lower end of the suspension rod. A second cold source cavity is provided in the pressing plate. The beneficial effect of the present invention is that before the pressure test, the circular pipe is dispersed into arc-shaped plates again and separated from the soil column, so that the soil column will not be blocked when being pressed, and the test result has high accuracy.

The application relates to the technical field of soil mechanics characteristic measuring equipment, in particular to a soil frost heaving force measuring device which comprises a piezoelectric ceramic probe, a lower base and an upper base; wherein the lower base is an annular base, the lower base is fixedly connected with the upper base through a suspension, the lower base is provided with a plurality of horizontal probe mounting holes, a horizontal pressure measuring probe is mounted in the horizontal probe mounting hole and the convex film end thereof faces the outside; a vertical probe pedestal is arranged on the upper surface of the lower base, a vertical pressure measuring probe is mounted on the lower base through the vertical probe pedestal and the convex film end thereof faces upwards; the upper base is cylindrical, the vertical pressure measuring probe is mounted in the upper base and the convex film end thereof faces downwards; the upper and lower base structures are used to prevent the measuring device from moving under pressure during the soil layering freezing and thawing process, and the vertical force measuring surface is located on the same horizontal plane, so that the measuring device will not be out of alignment due to the time difference of the layering freezing and thawing.

The invention discloses a test device and a test method for frost heaving force of frozen soil under high load. The test device comprises a temperature control chamber arranged in a refrigeration device, a loading device arranged in the temperature control chamber, a frost heaving amount monitoring device and a temperature monitoring control device, a loess sample is placed on the loading device, the loading device is connected with the transmission stand column and the loading plates through the loading head of the upper loading fixing device, and the acting force of the transmission stand column is applied to the loess sample between the loading plates; a lever loading system connected to the transmission column is arranged below the loading device, and the test precision of the frost heaving force of the frozen soil under different loads is adjusted through different gravities applied to the loading arm, so that the frost heaving capacity of the loess sample under different dry densities and water contents is obtained. According to the invention, a non-contact combined temperature measurement mode and a lever ratio continuously adjustable loading device are adopted, so that high-stress working conditions in projects such as building foundations and heavy roadbeds can be simulated, and reliable data are provided for research on frost heaving characteristics of frozen soil under complex load conditions such as subway tunnels and bridge foundations.

The utility model relates to experimental equipment for soil frost heaving, which comprises an equipment main body, a cylinder body which is arranged on the equipment main body and is used for installing a soil sample, a low-temperature circulating pump, a regulating valve and a heating element, a cold-end temperature control disc and a hot-end temperature control disc are respectively arranged at two ends of the cylinder body, and the heating element is arranged on the hot-end temperature control disc. The low-temperature circulating pump is provided with a circulating pipeline used for conveying a cold working medium, and the circulating pipeline is sequentially connected with the cold end temperature control disc and the hot end temperature control disc. The adjusting valve is arranged on the circulating pipeline, and the equipment body is provided with a sensing assembly. According to the utility model, the low-temperature circulating pump, the regulating valve, the heating element and the sensing component work cooperatively, so that the temperature, the pressure and the humidity of the soil sample can be accurately controlled, the real-time monitoring function is realized, and the heating element can operate to transmit the temperature to a cold working medium of a circulating pipeline through the hot-end temperature control disc, so that the temperature of the cold working medium is increased and maintained; and the temperature stability in the experiment process is ensured.

This invention relates to the field of soil frost heave characteristic testing technology, and particularly to an improved soil frost heave characteristic testing device and method, comprising an acrylic mold, wherein several threaded holes are respectively opened on both sides of the acrylic mold along its height direction, and a special hole bolt is threaded into the threaded holes. The special hole bolt includes a bolt part and a flared mouth with an integral structure. A circular hole is opened in the middle of the bolt part, and the flared mouth is threaded on the outside. A matching rubber stopper is installed in the middle of the flared mouth. The matching rubber stopper is frustoconical and is divided into four equal parts. The matching rubber stopper fits tightly with the flared mouth. The contraction of the flared mouth causes the middle hole of the rubber stopper to shrink, thereby fitting tightly with the sensor cable. A hexagonal metal washer is threadedly connected to the outside of the flared mouth. The hexagonal metal washer is used in combination with the flared mouth to tighten the flared mouth.

The invention belongs to the technical field of cables, discloses an anti-freezing buried cable with a phase change sheath, and aims to solve the technical problem that a buried cable in a cold region is easily damaged due to soil frost heaving pressure, the cable comprises an anti-freezing cable and a low-temperature phase change sheath which is coaxially wrapped, and the sheath is formed by embedding six or more groups of arc-shaped splicing strips; the inner side of the splicing strip is provided with a phase change chamber filled with a phase change composite material, the outer side of the splicing strip is provided with an air bag buffer chamber, the end clamping groove is clamped with a heating belt, and the outer side of the sheath is sequentially coated with heat preservation cotton and a glass fiber wrapping belt anti-corrosion layer. The cable flexibility is improved while the anti-pressure capability is guaranteed, laying and installation are facilitated, frost heaving pressure can be effectively relieved, material aging is delayed, the operation safety of the cable is guaranteed, and the service life of the cable is prolonged.

The application relates to the technical field of frozen soil deformation detection, and discloses a frozen soil frost heaving deformation experiment device and method, which comprises a low-temperature test box, a lead screw shaft, a bearing plate, a sliding plate and a half gear. The lead screw shaft is arranged, after detection, the rotation of the lead screw shaft drives the rocker arm to change, the bearing plate with the frozen soil test block is ejected from the low-temperature test box, the operator can conveniently dismount the frozen soil test block and the bearing plate, the possibility of frostbite is reduced, the frozen soil test block and the bearing plate are mounted and dismounted together in the later stage, the dismounting efficiency is not affected by the fact that the frozen soil test block is bonded to the bearing plate, when the bearing plate moves upwards, the sliding plate can be finally moved out of the sliding hole, the automatic unlocking purpose is achieved, the guide rack on the sliding plate is engaged with the half gear to rotate, the rocker plate is driven to rotate to the vertical state, the dismounting efficiency is improved, and the safety is higher.

The utility model discloses a kind of roadbed anti-frost heaving structures for filling and digging transition section belong to roadbed anti-frost heaving technical field, the roadbed anti-frost heaving structure includes in vertical direction, from top to bottom sequentially arranged pavement structure layer, first medium coarse sand layer, heat insulation layer and second medium coarse sand layer;The heat insulation performance of heat insulation layer can significantly reduce the influence of external low temperature on roadbed soil, reduce the occurrence of soil frost heaving, ensure the flatness and stability of road.The first medium coarse sand layer and the second medium coarse sand layer have good water permeability, improve the drainage performance of roadbed, can promptly discharge moisture in soil, further reduce the risk of frost heaving.Through preventing roadbed frost heaving, reduce the occurrence of pavement disease, thereby prolong the service life of road, reduce maintenance cost, while the construction process of roadbed anti-frost heaving structure is relatively simple, does not need complex equipment and technology, reduces construction difficulty and cost.

The present application belongs to the technical field of cable, and discloses an anti-freezing buried cable with phase change sheath, which aims to solve the technical problem that the buried cable in cold regions is easily damaged by soil frost heaving pressure. The cable comprises an anti-freezing cable and a coaxial low-temperature phase change sheath. The sheath is composed of six or more arc-shaped splicing strips. The inner side of the splicing strip is provided with a phase change chamber filled with phase change composite material, and the outer side is provided with an air bag buffer chamber. The end part is provided with a heating belt clamped by a clamping groove. The outer side of the sheath is sequentially covered with thermal insulation cotton and a glass fiber wrapping tape corrosion-resistant layer. The present application discards the steel belt armor and relies on the synergistic effect of phase change protection, air bag buffer and active heating to improve the flexibility of the cable while ensuring the compression resistance, facilitating the laying and installation, effectively resolving the frost heaving pressure, delaying material aging, ensuring the safe operation of the cable and prolonging its service life.

The invention discloses a soil body freezing state monitoring system and method, and relates to the field of geotechnical engineering monitoring, and the system comprises a piezoelectric sensor which is arranged in a to-be-monitored soil body and is used for converting the pressure generated by the to-be-monitored soil body on the surface of the piezoelectric sensor into an original electric signal; the state monitoring device is used for obtaining soil body freezing state characteristics according to the original electric signals; the soil body freezing state characteristics comprise soil body frost heaving stress and soil body elasticity modulus. The integrated soil body freezing state monitoring system is built based on the piezoelectric sensor, and frozen soil characteristics and strength characters in the soil body construction period and the operation and maintenance period can be timely and effectively analyzed.

The present invention discloses a frozen soil column test device and method based on thermoelectric cooling and DIC monitoring. The device includes a transparent soil column container, a temperature control system, and a digital image acquisition system. The transparent soil column container is used to fill the soil column sample, and the transparent soil column tube is composed of two double-walled acrylic semi-cylinders. This allows the frozen soil freezing process and frost heave behavior to be visualized, facilitating real-time monitoring and analysis. During the experiment, the temperature control system accurately adjusts the internal and external temperatures to simulate the frozen soil freezing process. The digital image acquisition system uses a high-resolution camera to capture real-time images of the soil column surface. Combined with digital speckle, digital image correlation technology is used to monitor and analyze the amount of soil frost heave and the position of the freezing front in real time, capable of highly accurately measuring the soil frost heave characteristics and the dynamic changes of the freezing front.

The present invention belongs to the technical field of frozen soil construction, and specifically relates to a construction process method of a PHC pipe pile collaborative anti-freezing and pulling device. The PHC pipe pile collaborative anti-freezing and pulling device includes a sliding system, a steel inner sleeve pile body, and a steel anti-pulling spiral skeleton. The sliding system includes hydrophobic medium coarse sand, a steel outer sleeve, and a rubber sealing ring. The construction process is as follows: 1. Level the site and carry out static pressure pile construction of PHC pipe piles; 2. Clean the holes of PHC pipe piles; 3. Press and twist the anti-pulling spiral skeleton; 4. Pour fine aggregate concrete into the pile holes of PHC pipe piles; 5. Excavate around the piles, install the sliding system, and finally backfill and compact the sand and soil. The process utilizes the steel anti-pulling spiral skeleton and the sliding structure at the lower part of the pile body main body to consume and resist a certain amount of freezing and pulling force, achieving the purpose of preventing the pile body from being frozen and pulled. It does not require additional energy such as electric energy and heat energy to slow down soil frost heave, meets the requirements of PHC pipe pile anti-freezing and pulling in cold regions in winter, and can be popularized in cold regions in winter.

The application discloses a frozen method construction monitoring method based on physical simulation and a memory network, and comprises the following steps: a comsol large physical finite element model of the frozen method under different construction conditions is constructed to simulate and calculate to obtain the temperature distribution of a construction area, the frozen wall thickness, the soil frost heaving displacement and the soil stress distribution of the frozen method construction process under different environmental factor conditions at different time points; the temperature and the soil frost heaving displacement of the construction area are taken as input features of a machine learning model, and the soil stress and the frozen wall thickness of the construction area are taken as output labels of the machine learning model; soil parameters of a frozen method construction area to be monitored are acquired in real time; the soil stress and the frozen wall thickness of the frozen method construction area are predicted in real time based on the soil parameters and through the trained machine learning model; and when the soil stress and the frozen wall thickness exceed a warning threshold range, a warning notice is generated. The application solves the problem that the existing frozen method construction monitoring method has low efficiency.