50 results about "Soil frost" patented technology

The invention is a soil frost-heaving and thawing-settlement tester based on thermoelectric refrigeration control, which comprises a tester main body, a acquisition control device, a water supplement device, a loading device, wherein the water supplement device is connected with a bottom water supplement groove body of the tester main body; the acquisition control device is connected correspondingly with a A temperature sensor which is responsible for the monitoring of sample temperature gradient change in the tester main body, a displacement sensor, and a hydrostatic sensor; the acquisition control device is connected with a B temperature sensor in a semiconductor refrigerating body; the loading device is disposed in a pressure chamber in the tester main body. The advantages are that: according to the test water content, the test is supplemented with water and drained automatically from the lower part, the water supplement amount is calculated accurately; the hole pressure in the draining process is monitored. Continuous stepless loading is realized; the frost heaving force testing is realized after stepless continuous automatic loading and locking volume, and the simulation truth degree for natural conditions in laboratory frost-heaving and thawing-settlement test is improved, and the test efficiency is improved and the test labor intensity is reduced.

The invention discloses a one-dimensional soil column frost heave deformation tester, the one-dimensional soil column frost heave deformation tester comprises an organic glass mould for containing a one-dimensional cylindrical soil column, a circulator for soil column frost heaving through refrigeration, a test device for soil column frost heave deformation in the frost heaving process, a monitoring device for real-time monitoring of internal temperature change of a soil sample along the soil column height change in the refrigeration process, a water replenishing device for simulation of replenishing groundwater into the soil column from bottom to up, a drainage device, a testing device for testing the pore water pressure of the soil column in the process of frost heaving, and a data acquisition system; the one-dimensional soil column is a cylindrical soil sample, the mould for containing the one-dimensional cylindrical soil column is vertically-arranged cylindrical double-layer transparent organic glass, and the water replenishing device is connected with the bottom of the one-dimensional cylindrical soil column by a water replenishing pipe. The one-dimensional soil column frost heave deformation tester has the advantages of simple structure, reasonable design, practical operation and good practical effect, can simulate the indoor soil frost heave deformation process, and can effectively test soil body internal temperature, pore water pressure, vertical frost-heave capacity, vertical volume deformation and frost heaving force.

The frost heaving device of layered telescopic detecting soil and a detecting method thereof are disclosed. In cold area engineering construction, due to the complicated geological condition of a construction site, the monitoring of frozen soil frost heaving deformation is difficult, and frost heaving data at different depths in one area is difficult to acquire at the same time. In the frost heaving device, a plurality of casing-pipe-type monomers are successively arranged on a chassis from bottom to top, an anchor plate is arranged outside a tube body, a displacement sensor is arranged on theinner wall of the tube body, the top end of the tube body is processed with a boss, the bottom end of the tube body is processed with a groove, and the tube body of one casing-pipe-type monomer is slidably cooperated with the two adjacent casing-pipe-type monomers through the boss and the groove. According to the frozen soil type in a test area, the number of measuring points in the test area andthe distribution position of each measuring point are determined, the frost heaving amount data of the frost heaving layer of each measuring point in different time periods is obtained through the frost heaving device, and according to frost heaving amount data gathering fed back by each measuring point, a frozen soil frost heaving deformation condition in the test area is obtained. The device and the method are used for the monitoring of the frozen soil frost heaving amount in a vertical or horizontal direction.

The invention discloses a constant pressure self-circulation frost heave test system, which includes a frost heave test subsystem and a water pressure control subsystem. The frost heave test subsystem includes a test box and a controller module. The test box is also equipped with a temperature detection device, a refrigeration device, a displacement detection device and a pressure device; a base is arranged in the test box, and a water retention pool is arranged on the base, and the sample box is placed in the water retention pool. The bottom surface of the base is a perforated backing plate with a certain thickness; the water pressure control subsystem includes a water storage tank and an active water delivery device. A drain is provided, and the water in the water retention tank beyond a certain position is discharged from the drain. The invention can not only simulate the deformation test of plain soil and saline soil in a low temperature environment in the laboratory, but also ensure the constant water pressure and the recycling of test water in the test process.

The invention discloses a sliding-sleeve-provided steel pipe pile photovoltaic support foundation used for frozen earth areas. The steel pipe pile photovoltaic support foundation comprises a steel pipe pile body which comprises a steel pipe and a spiral disc steel pipe; the inner diameter of the steel pipe is matched with the outer diameter of the upper end part of the spiral disc steel pipe, and the lower end of the steel pipe is detachably connected with the upper end of the spiral disc steel pipe; the lower end of the spiral disc steel pipe is conic, and a spiral disc is arranged at the middle portion of the spiral disc steel pipe; and the outer portion of the steel pipe is sleeved with a U-PVC sleeve, the inner diameter of the U-PVC sleeve is matched with the outer diameter of the steel pipe, and the outer diameter of the U-PVC sleeve is matched with the outer diameter of the part, close to the upper end part, of the spiral disc steel pipe. The steel pipe pile photovoltaic support foundation has the frost heaving resistant capacity and the pile tip construction error adjusting capacity, and pile tip displacement cannot be influenced by foundation soil frost heaving; and the construction method of spinning pile sinking or pile anchoring after excavation is adopted.

The invention discloses a rock-soil frost heaving thawed collapse two-dimensional vector measuring method. A rock-soil frost heaving thawed collapse two-dimensional meter related in the rock-soil frost heaving thawed collapse two-dimensional vector measuring method solves deformation amount of frost heaving thawed collapse deformation in the normal direction and the tangential direction or vectors of the frost heaving thawed collapse deformation by monitoring the angle variable quantity and the displacement variable quantity, the frost heaving thawed collapse deformation amount in the tangent direction and the frost heaving thawed collapse deformation amount in the normal direction are synchronously monitored in a two-dimensional plane, the rock-soil frost heaving thawed collapse amount is determined, and the aim of monitoring the frost heaving thawed collapse deformation is achieved. The technical defect that in a traditional monitoring method, the one-dimensional vertical deformation amount or the one-dimensional normal deformation amount serves as the frost heaving thawed collapse amount is overcome, and meanwhile the temperature monitoring function is achieved. Reliable and accurate monitoring data can be provided for frost heaving thawed collapse deformation of channel slopes in severe cold areas and cold areas.

The invention discloses a circulating compression-shear soil frost heaving test system and test method. The test system comprises a temperature control test cabin, a horizontal loading motor, a vertical loading motor, a horizontal displacement sensor, a horizontal force sensor, a vertical displacement sensor, a vertical force sensor, a pore pressure acquisition instrument, a temperature controller, a Markov water replenishing bottle and a power supply. For a test soil unit, the temperature control test chamber adopts a temperature control metal plate to form a temperature control space around a test piece, so that the test is prevented from being influenced by the atmospheric environment on one hand, and on the other hand, a laminated ring with relatively small thickness can be conveniently adopted in the test, and the loading effect of the horizontal cyclic shear stress of the soil unit is improved. The vertical direction and the horizontal direction of the soil body frost heaving test system can be set to be static or dynamic loading, a soil body frost heaving test, a soil body melting test or a soil body freezing and thawing cycle test under temperature-complex stress path coupling can be carried out, and dynamic parameters such as dynamic shear modulus and damping ratio of frozen soil or positive temperature soil can be tested.

The invention relates to a structure for preventing telegraph pole upward pulling due to soil frost heaving. The structure for preventing telegraph pole upward pulling due to soil frost heaving comprises a telegraph pole, a sleeve, a waterproof layer and a drag reduction layer. The sleeve is arranged at the bottom end of the telegraph pole, and the sleeve and the telegraph pole are arranged in thewaterproof layer. The drag reduction layer is arranged on the surface of a pole foor of the telegraph pole, and the sleeve is constituted by a sleeve body and an annular cover which are fixedly connected. The upper end of the annular cover is in acute angle connection with the telegraph pole, and the upper end of the annular cover and the telegraph pole are fixedly connected. The edge of the lower portion of the sleeve body is in a blade shape, and the interior of the sleeve and the position between the sleeve and the waterproof layer are filled with dry and tamped fine sand. Through arrangement of acute angle connection between the upper end of the annular cover and the telegraph pole, acting force of soil frost heaving on telegraph pole upward pulling is converted into vertical downwardacting force, resistance of telegraph pole upward pulling is increased, and the problem of telegraph pole upward pulling due to soil frost heaving can be avoided well.

The invention discloses a soil frost heave force measurement device, which comprises a measurement tank and a measurement element. The measurement tank is divided into three areas, i.e. a water tank,a soil carrying tank and a measurement area from bottom to top through a permeable carrying plate and a top plate; a water inlet pipe is arranged on an outer wall of one side of the water tank; a water outlet pipe is arranged on an outer wall of the other side of the water tank; the soil carrying tank is used for placing a tested soil sample; a plurality of permeable holes are formed in the permeable carrying plate on the lower part, and a piece of thin filter paper covers; water in the water tank is immersed into the soil sample in the soil carrying tank through the permeable holes; two reinforcing steel bars are symmetrically arranged in the measurement area; the bottom parts of the reinforcing steel bars are fixedly connected with a top plate; the top parts of the reinforcing steel barspress against on a tank cover; the tank cover seals on the measurement tank; slideways for the top plate to slide up and down are arranged on two opposite side walls of an area on which the soil carrying tank and the measurement area are located; the measurement element comprises two reinforcing steel bar stress detectors arranged on the corresponding reinforcing steel bars. The measurement device provided by the invention is simple in structure, convenient to operate and capable of accurately measuring a soil frost heave force.

The invention relates to a transmission telegraph pole pull-up preventing structure with a reset function. The structure comprises a telegraph pole, a drag reduction layer, an annular cover and a reset device; the telegraph pole is vertically arranged, the reset device is arranged at the bottom end of the telegraph pole, the annular cover is arranged on the upper portion of the reset device, an acute angle is formed between the conical tip end of the annular cover and the telegraph pole, the conical tip end of the annular cover is fixedly connected with the telegraph pole, and the drag reduction layer is arranged on the surface of a pole root of the telegraph pole; the reset device is composed of tires and hubs, the tires and the hubs are installed in a matched mode and are horizontally placed, the bottommost end of the telegraph pole is fixedly connected with the hub at the uppermost layer, and the other end of the annular cover is also fixedly connected with the hub at the uppermostlayer. According to the structure, by adopting the acute angle connection arrangement between the upper end of the annular cover and the telegraph pole, the pull-up acting force of soil frost heavingon the telegraph pole is converted into the vertically-downward acting force, so that the pull-up resistance of the telegraph pole is increased, and the problem that the telegraph pole is pulled up due to soil frost heaving can be well solved.

The invention discloses a controllable temperature soil frost heaving tester, which overcomes the problem that the soil frost heaving in the field cannot be fully simulated. The controllable temperature soil frost heaving tester comprises a test box (1), an ambient temperature control system, a soil temperature monitoring system, an information acquisition system (14), and a computer (15). The test box (1) includes a main box and a soil sample tube (2), and a partition plate (12) is provided in the main box; the soil sample tube (2) includes a top plate (3), a bottom plate (4), and a cylinder(5); two sets of cooling/heating devices (13) of the ambient temperature control system and an upper top plate (3) are connected with an upper circulating liquid pipe (9) of a lower bottom plate (4) and a lower circulating liquid pipe (10), four plug-in temperature sensors (11) of the soil temperature monitoring system are inserted into the soil samples in a cylinder (5), and the information terminals of the four plug-in temperature sensors (11) are connected to the information acquisition system (14); and the information acquisition system (14) is connected to a computer (15).

The invention discloses a self-balancing soil frost heaving double-barrel test device and a test method of the test device. The device comprises an inner barrel and an outer barrel, wherein a top plate is arranged at the top end of the inner barrel; holes are reserved in the centers of the top plate and bottom plates of the barrels; an anchor rope dynamometer channel equivalent to the diameter of each hole is arranged in a centering manner; an anchor rope dynamometer is connected with an acquirer by a lead wire; five temperature measurement pipes are reserved in corresponding height positions of inner and outer barrel walls in height directions of barrel bodies; five outer water replenishment ports are uniformly formed in a perimeter direction in the outer barrel walls close to the bottoms of the barrels; water replenishment pipeline terminals connected with the outer water replenishment ports are connected with a water pressure tank with constant volume; inner exhaust ports are reserved in the bottom plate of the inner barrel; outer drainage ports are reserved in the bottom plate of the outer barrel, and provided with valves; the bottoms of the barrels are embedded into a fixed support; and four bolt holes are formed in the fixed support. The test device is simple in structure, convenient to operate and wide in application scope, and requires no separate pressure device.

The invention discloses a servo type soil frost heaving and thaw collapse test device and a test method thereof, and relates to a test device and a test method. According to the invention, the problemof no related research on frost heaving and thaw collapse characteristic test related equipment and test method of the soil body under the condition of applying a constant load in the prior art is solved. A refrigerating system is installed on a base, a test cabin is installed on the refrigerating system, a heating device is installed in the test cabin, a sample mold is installed in the test cabin, a displacement sensor is installed on the sample mold, a pressurizing device is installed at the upper end of the test cabin, a water supplementing device is installed on the outer side wall of thetest cabin, a control system, a data acquisition module and a water bath system are sequentially mounted on the right sides of the test cabin and the refrigerating system from top to bottom. The method comprises the steps of preparing a sample; installing and connecting a sample mold; connecting the water bath system with the sample mold; setting test parameters; supplementing water to the sample; and observing whether the test time of the sample reaches a set time length or not, and if so, stopping the test. The device is used for soil frost heaving and thaw collapse tests.

The invention relates to a large-scale frost heaving test system for coarse-grained soil, and aims to solve the problems that most of researches on frost heaving test devices are concentrated on fine-grained soil at present, and frost heaving researches on the coarse-grained soil are few. The large frost heaving test system for the coarse-grained soil comprises a base constant-temperature water replenishing system, a temperature monitoring system, a top freezing system and a frost heaving deformation monitoring system, according to the freezing mode, through a freezing refrigeration top plate (9), a hollow core test cylinder (5), a bottom constant temperature device (4), a first water bath refrigerator (15), a second water bath refrigerator (20) and a bottom water system, a more accurate one-way freezing test under the water supplementing condition is achieved; on the aspect of frost heaving deformation monitoring, the frost heaving deformation amount of soil is accurately and automatically monitored through a digital display dial indicator (16), and the automation and accuracy of the test are improved; the device is applied to the field of coarse-grained soil frost heaving tests, and provides certain support for the frost heaving problem in projects such as roads, buildings and water conservancy.

The invention relates to a soil frost heaving detection device without an external power supply and a detection method of the soil frost heaving detection device. In the construction of cold region engineering, frost heaving deformation monitoring of frozen soil is high in difficulty and low in efficiency, and most of existing soil frost heaving detection devices require continuous external powersupplies, so that corresponding matched instrument equipment on the surface is relatively numerous, the occupied area is large, surface damage parts are relatively numerous, and the operation steps are complicated. According to the device, a sleeve pipe is arranged on a base plate; an upper anchor plate is fixedly connected to the upper end of the sleeve pipe; an elastic part is arranged in the sleeve pipe; the stress end of a tension sensor penetrates through the upper anchor plate to be connected with one end of the elastic part; and the other end of the elastic part is connected with the base plate through a connecting rod. According to the method, a soil frost heaving detection device is correspondingly installed at each measuring point; frost heaving amount data of a frost heaving layer wherein each measuring point is located in different time periods is obtained through each soil frost heaving detection device; and a frost heaving deformation situation of the frozen soil in a test area is obtained by summarizing the frost heaving amount data fed back by all the measuring points. The detection device and the detection method are used for monitoring the frost heaving amount ofthe frozen soil.

The invention discloses a self-balancing soil frost heaving experiment barrel and an experiment method thereof. The self-balancing soil frost heaving experiment barrel comprises a barrel body, a cylindrical anchor rope dynamometer passage is mounted at the center of the barrel body, an organic glass top plate closely contacting with the wall of the barrel body and capable of sliding up and down is arranged at the top end of the barrel body, a hole is reserved in the center of each of the top plate and a bottom plate of the barrel body, an anchor rope dynamometer is connected with a collector through a lead, five temperature measuring holes are reserved in the height direction of the barrel wall, five water replenishing ports are arranged on the barrel wall close to the bottom of the barrel body and higher than the upper edge of a fixing support along the circumference direction, a water replenishing pipeline terminal connected with the water replenishing ports is connected with a water pressure tank with constant volume, a liquid turbine flow meter is mounted on each water replenishing pipeline, five exhaust ports are arranged on the bottom plate of the barrel body, and the bottom of the barrel body is nested with the fixing support. The experiment barrel is simple in structure, needless of a separate pressurizing device, convenient to operate and wide in application range.

The invention discloses a foundation pit side wall frost heaving prevention method, and belongs to the technical field of building construction. The side wall of a foundation pit is provided with a water draining hole, the water draining hole is a metal pipe draining pipe, a water draining hole is formed in the metal pipe, the outer portion of the segment, inserted into the soil on the side wall of the foundation pit, of the metal pipe is wrapped with water filter gauze, the metal pipe is connected with a power cathode, a metal bar is connected with a power anode, the metal bar corresponds tothe metal pipe on the same side, the ground surface of the position, between the metal bar and the side wall of the foundation pit, of the upper portion of the foundation pit is provided with waterproof geotechnical cloth, the metal pipe is connected with the power cathode, the metal bar is connected with the power anode, the metal pipe and the metal bar are correspondingly mounted, water in soilcan be smoothly drained, and through a method of reducing the water containing amount in the soil, soil frost heaving damage to the side wall of the foundation pit can be prevented.