CN212514158U - Unsaturated expansive soil permeability coefficient and expansive force measuring device - Google Patents
Unsaturated expansive soil permeability coefficient and expansive force measuring device Download PDFInfo
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- CN212514158U CN212514158U CN202020633041.5U CN202020633041U CN212514158U CN 212514158 U CN212514158 U CN 212514158U CN 202020633041 U CN202020633041 U CN 202020633041U CN 212514158 U CN212514158 U CN 212514158U
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Abstract
The invention discloses a device for measuring the permeability coefficient and the expansive force of unsaturated expansive soil, which relates to the technical field of soil body permeability coefficient measurement and comprises a sample chamber, a water supply system, a data acquisition system and a weighing unit. Wherein the sample chamber is connected with a water supply system through a rubber hose; the upper end of the dowel bar is provided with a pressure sensor for measuring the vertical expansion force of unsaturated expansive soil in the process of reaching saturation; the tensiometer and the moisture sensor are sequentially and uniformly arranged on the cylindrical organic glass cylinder from top to bottom; the gravity measuring device measures the water quantity change in the water supply device and the water storage device; the data acquisition unit transmits the electric signal to the computer according to the fixed frequency for recording and reading. The method can record the expansion force of the earth pillar at different stages generated in the process of reaching saturation and predict the change rule of the expansive soil under the action of different water contents and dry densities. The experimental device is simple to operate and high in measurement precision.
Description
Technical Field
The invention belongs to the field of civil engineering data measuring equipment, and relates to a measuring device for unsaturated expansive soil permeability coefficient and expansive force under the condition of simulating three-dimensional limitation.
Background
Unsaturated soil is different from saturated soil in that the unsaturated soil consists of solid soil particles, liquid water and gas, and the permeation of unsaturated soil includes both water permeation and gas permeation. The migration of water in unsaturated soil makes the permeability and expansibility of soil body change dynamically rather than a fixed value. Therefore, before studying the relevant physical and mechanical properties of unsaturated soil, it is necessary to study the migration of water in unsaturated soil, and it is necessary to develop the study of the permeability characteristics of unsaturated soil. The permeability characteristic of unsaturated expansive mudstone is measured, the moisture content change of the mudstone foundation is predicted, and the expansion characteristic and the permeability characteristic of the mudstone can be mutually linked to evaluate the service state of the foundation.
Unsaturated sandy soil and expansive soil are more common in practical engineering, and the traditional soil column seepage device is suitable for sandy soil with larger pores and more saturated soil permeability coefficient measurement suitable for right side limit. The traditional earth pillar seepage device does not consider the influence of overburden load (earth layer dead weight, roadbed load, train impact load and the like) on the permeability coefficient of expansive soil in actual engineering, an expansive soil sample is in a laterally limited environment, and the influence of porosity reduction on the permeability coefficient after the soil body is expanded and deformed in actual engineering is difficult to simulate; the sensor precision is small, the arrangement distance is large, and the permeability coefficient of the expansive soil with larger permeability coefficient cannot be measured more accurately; the effect of vertical and horizontal water flow on the permeability of the expanded mudstone is difficult to measure respectively; the expansion force change in the soil body permeation saturation process is difficult to measure, and the expansion characteristic and the permeability characteristic of the mudstone cannot be mutually related.
Disclosure of Invention
The invention aims to provide a measuring device capable of simulating the permeability coefficient and the expansion force of the approximately three-dimensional limited unsaturated expansive soil under the actual engineering condition so as to better solve the technical problem in the actual engineering.
The technical scheme of the invention is as follows: a device for measuring the permeability coefficient and the expansive force of unsaturated expansive soil comprises a sample chamber, a supporting mechanism, a loading mechanism, a water supply system, a data acquisition system and a weighing unit, wherein the sample chamber is a cylindrical barrel, the top of the cylindrical barrel is provided with a top cover, the bottom of the cylindrical barrel is provided with a concave base, the concave base is provided with a middle round hole, the cylindrical barrel is internally used for containing a soil sample to be measured, the bottom of the cylindrical barrel is paved with a water permeable structure, the soil sample to be measured is arranged on the water permeable structure, and the top of the soil sample to be measured is also provided;
the supporting mechanism is provided with a loading top plate, a supporting frame and a supporting base, the supporting frame is fixed on the supporting base, the loading top plate is connected onto the supporting frame, and the sunken base is fixedly connected onto the supporting base through a fixing bolt and a fixing nut;
the loading mechanism is provided with a loading base, a loading rod and a hand wheel, the loading base is positioned above a top water-permeable structure in the cylindrical barrel, a water injection hole is formed in the center of the loading base, exhaust holes are formed in the loading base, a waterproof breathable film is paved on the bottom surface of the loading base, a round hole larger than or equal to the diameter of the water injection hole is formed in the center of the waterproof breathable film, the loading rod is arranged above the loading base and penetrates through the top cover in a sliding mode to be connected with the hand wheel, a pressure sensor is arranged between the loading rod and the hand wheel, the hand wheel is provided with a threaded rod, and the threaded rod penetrates;
the water supply system comprises a water supply device, a water storage device, a water inlet component and a water discharging component, wherein the water inlet component comprises a water inlet pipe and a rubber hose, one end of the water inlet pipe is connected with the water supply device, the other end of the water inlet pipe penetrates through the columnar cylinder, the rubber hose is connected with the water inlet pipe and the water injection hole, the water discharging component comprises a water outlet pipe, one end of the water outlet pipe is connected with the middle round hole of the concave base, the other end of the water outlet pipe is connected with the;
the data acquisition system comprises a tensiometer, a moisture sensor and a pressure sensor, wherein the tensiometer and the moisture sensor are arranged on the side wall of the cylindrical barrel, probes of the moisture sensor and the tensiometer are inserted into a sample to be detected, the pressure sensor is arranged between the loading rod and the hand wheel threaded rod, the tensiometer, the moisture sensor and the pressure sensor are respectively connected with a data acquisition unit, and the data acquisition unit transmits data signals to a computer for acquisition and storage (the computer program used for data acquisition is the prior art).
The weighing unit comprises a water supply device and a weighing device below the water storage device.
Preferably, the permeable structure is a permeable stone cushion layer and filter paper, the concave base is paved with the permeable stone cushion layer, the permeable stone cushion layer is paved with bottom filter paper, the bottom filter paper is a soil sample to be detected, and the filter paper, the permeable stone cushion layer and the filter paper are sequentially arranged at the top of the soil sample to be detected.
The cylindrical barrel is made of transparent organic glass, and the side wall of the cylindrical barrel is marked with a dimension line; the tensiometer and the moisture sensor are arranged at equal distance from top to bottom, the adjacent distance is 100mm, the tensiometer and the moisture sensor are respectively provided with four tensiometers, and one tensiometer and one moisture sensor are arranged correspondingly. A plurality of sensor mounting holes (unused holes are blocked by plugs) are reserved on the cylindrical barrel, so that the number and the spacing of the sensors can be increased, decreased and adjusted as required.
The water supply device is arranged on the object carrying plate, the object carrying plate is connected to the cross beam, the cross beam is sleeved on the support frame, the support frame comprises a threaded rod, and the position of the cross beam is adjusted through a positioning screw arranged on the threaded rod.
It is preferable that: the object carrying plate is provided with two insert rods, the distance between the two insert rods is slightly larger than the height of the cross beam, the cross beam is provided with clamping holes corresponding to the insert rods, the front ends of the insert rods are square, the rear ends of the insert rods are round rods with the diameter smaller than the side length of the square cross section of the front ends, the round rods are provided with threads, and the clamping holes are square holes; when the columnar cylinder is vertically placed, the carrying plate is inserted into the cross beam, the square section of the inserted rod enters the clamping hole, and the thread extends out of the clamping hole and is fastened by the nut; when the cylindrical barrel is transversely placed, the object carrying plate and the cross beam are connected in a clamped mode, the cross beam is perpendicular to the ground, a gap between the two insert rods is clamped on the cross beam (the relation between the side wall of the square section and the side wall of the cross beam is equivalent to clearance fit), the nut of the thread section is screwed (the cross beam is made of a material with a rough surface, and the surface of the cross beam is not required to be smooth like stainless steel), and the object carrying plate is firmly fixed with the cross. During vertical penetration measurement (vertical placement of the columnar cylinder), the object carrying plate is inserted into the square clamping hole of the cross beam through the inserted rod for fixation, and the position of the object carrying plate is adjusted by adjusting the positioning screw; when the horizontal penetration is measured (the columnar cylinder is transversely placed), the cross beam is clamped between two insert rods of the loading plate, and the position of the loading plate is adjusted by fixing the position by using screws.
It is preferable that: the loading base is an aluminum alloy metal circular plate, the diameter of the loading base is slightly smaller than that of the columnar cylinder (the gap between the peripheral edge of the loading base and the inner wall of the columnar cylinder is small, the loading base is just placed in the columnar cylinder, and the loading base and the columnar cylinder can move relatively at the same time). A water injection hole is formed in the circle center of the aluminum alloy metal circular plate, and the diameter of the water injection hole is slightly larger than the outer diameter of the rubber hose; the aluminum alloy metal circular plate adopts a partially hollowed design. The rubber hose is hermetically connected with the water injection hole by glue. Its advantage does: the aluminum alloy is not easy to corrode; carry out sealing connection with rubber hose and metal sheet water injection hole, can avoid producing extra flood peak pressure, in the experiment of side direction rivers infiltration, can eliminate the position flood peak influence.
It is preferable that: except for the central round hole, the other parts of the waterproof breathable film are hermetically connected with the non-hollow part at the lower part of the loading base by glue. Its advantage does: the experimental soil sample is ensured to be communicated with the atmosphere, and the influence of the air pressure in the soil body on seepage is avoided.
It is preferable that: the weighing device is a micrometer electronic scale. The water supply device is a Mariotte bottle.
It is preferable that: the exhaust holes are uniformly arranged along a circumference, each exhaust hole is fan-shaped, and the width of the diameter of each exhaust hole is 1/4-1/3 of the radius of the loading base.
It is preferable that: the upper section of the loading rod is a cylindrical straight rod, the lower section of the loading rod is a three-toe base, and the middle part of the loading rod is an expansion plate.
Further, the method comprises the following steps: the lower part of the supporting base is connected with a horizontal adjusting footing and a rubber footing, and the side surfaces of the supporting base and the loading top plate are respectively connected with the horizontal adjusting footing and the rubber footing; the horizontal adjusting foot and the rubber foot which are connected with the lower part of the supporting base are used for adjusting the state level of the columnar cylinder when the columnar cylinder is kept vertical; the horizontal adjusting feet and the rubber feet which are connected with the lateral sides of the supporting base and the loading top plate are used for adjusting the state and the level of the cylindrical barrel when the cylindrical barrel is kept to be horizontal.
The invention has the beneficial effects that: compared with the prior art, the change relation of the water content of the soil body along with time is obtained through the water sensor; obtaining a change curve of soil matrix suction and moisture content by a tensiometer; obtaining dynamic change of expansion force through a pressure sensor; obtaining the water quantity change in the device through a weighing unit; and the data collector is connected with a computer to analyze the data to obtain the relation of the infiltration-expansion characteristics of the expanded soil body. The method is suitable for measuring the permeability coefficient and the corresponding expansion force variation trend of the expansive soil in the civil engineering under the unsaturated condition. The method can record the expansion force of the earth pillar at different stages generated in the process of reaching saturation, and predict the change rule of the expansive soil under the action of different water contents and dry densities; the permeability coefficient and the expansive force of the expansive soil under the three-dimensional limited condition can be measured; the relation among the soil expansion force, the water content and the permeability coefficient can be represented; the experimental device is simple to operate and high in measurement precision.
Drawings
FIG. 1 is a schematic view of an apparatus for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to the present invention;
FIG. 2 is a front view of the sample chamber of the present invention positioned vertically;
FIG. 3 is a left side view of the sample chamber of the present invention positioned horizontally;
FIG. 4 is a front view of the load lever of the present invention;
FIG. 5 is a bottom view of the load lever of the present invention;
FIG. 6 is a schematic view of a top water-permeable device of a sample cell according to the present invention;
FIG. 7 is a schematic view of a bottom water-permeable device of a sample chamber according to the present invention;
FIG. 8 is a schematic view of a beam of the present invention;
FIG. 9 is a schematic view of a carrier plate according to the present invention;
FIG. 10 is a schematic top view of the beam and carrier plate assembly of the present invention during vertical measurements;
FIG. 11 is a schematic top view of the cross-piece and carrier plate assembly of the present invention taken in a horizontal direction;
FIG. 12 is a schematic view of a support base according to the present invention;
fig. 13 is a top view of the loading base of the present invention.
Wherein: 1-a cylindrical barrel; 2-a tensiometer; 3-a moisture sensor; 4-filter paper; 5-permeable stone cushion layer; 6-loading the base; 7-water injection hole; 8-a loading rod; 9-a top cover; 10-a hand wheel; 11-a pressure sensor; 12-loading the top plate; 13-a support frame; 14-a support base; 15-a water supply device; 16-a weigher; 17-a concave base; 18-a valve; 19-bottom filter paper; 20-a data collector; 21-a computer; 22-a water inlet pipe; 23-a rubber hose; 24-a drain pipe; 25-a drain hole; 26-a water storage device; 27-soil sample; 28-a cross beam; 29-set screws; 30-carrying plate; 31-horizontal adjustment feet; 32-rubber footing; 33-fixing the bolt and nut; 34-a vent hole; 35-waterproof and breathable film.
Detailed Description
The utility model provides a soil osmotic coefficient and expansibility measuring device of unsaturated swelling, includes sample room, supporting mechanism, loading mechanism, water supply system, data acquisition system and weighing unit, the sample room is a column section of thick bamboo 1, and 1 top of a column section of thick bamboo is equipped with top cap 9, bottom has sunken shape base 17, and sunken shape base 17 has middle round hole 25, and 1 inside dress that is used for of a column section of thick bamboo is awaited measuring soil sample 27 greatly, and 1 bottom of a column section of thick bamboo has laid the structure of permeating water, is the soil sample 27 that awaits measuring on the structure of permeating water, and the soil sample 27 top that awaits measuring also has the structure.
The supporting mechanism is provided with a loading top plate 12, a supporting frame 13 and a supporting base 14, the supporting frame 13 is fixed on the supporting base 14, the loading top plate 12 is connected on the supporting frame 13, and a concave base 17 is fixedly connected on the supporting base 14 through a fixing bolt and a fixing nut 33; the support frame 13 is provided with a threaded rod, round holes are formed in two ends of the loading top plate 12, the loading top plate 12 is sleeved on the threaded rod, and the position of the loading top plate 12 on the threaded rod is adjusted and fixed through nuts. The concave base 17 may be integral with the cylindrical barrel 1 or may be separate, and if separate, the two are connected by screws, and a sealing ring, preferably a rubber sealing ring, is provided between the contact surfaces. The sealing ring has the function of preventing water from flowing out from the joint of the concave base 17 and the columnar cylinder 1 in the saturation process after the concave base and the columnar cylinder are fixedly connected by screws. The diameter of the middle recess of the recess-shaped base 17 is 1/2, which ensures the bearing capacity of the base and the permeable stone and provides a larger exhaust surface.
Loading mechanism has loading base 6, loading arm 8, hand wheel 10, and loading base 6 is located the top of 1 inside of a column section of thick bamboo structure top of permeating water, 6 central points of loading base put and are equipped with a water injection hole 7, loading base 6 arranged the fretwork part, the fretwork part constitutes exhaust hole 34, and 6 bottom surfaces of loading base have been laid waterproof ventilated membrane 35, waterproof ventilated membrane 35 central trompil, hole and water injection hole 7 communicate with each other, loading base 6 top is loading arm 8, and 8 slip of loading arm pass hand wheel 10 is connected to top cap 9, be equipped with pressure sensor 11 between loading arm 8 and the hand wheel 10, hand wheel 10 has the threaded rod, and the threaded rod passes the middle screw hole of loading roof 12, adjusts the screw in length of threaded rod relative loading roof 12 through twisting hand wheel, and then adjusts the pressure sensor height.
The water supply system comprises a water supply device 15, a water storage device 26, a water inlet component and a water drainage component, wherein the water inlet component comprises a water inlet pipe 22 and a rubber hose 23, one end of the water inlet pipe 22 is connected with the water supply device 15, the other end of the water inlet pipe 22 penetrates through the cylindrical barrel 1, the rubber hose 23 is connected with the water inlet pipe 22 and the water injection hole 7, the water drainage component comprises a water outlet pipe 24, one end of the water outlet pipe 24 is connected with a middle round hole 25 of the concave base 17, the other end of the water outlet pipe 24 is connected with the water storage; the water outlet pipe 24 and the round hole 25 are sealed by glass cement.
The data acquisition system comprises a tensiometer 2, a moisture sensor 3 and a pressure sensor 11, wherein the tensiometer 2 and the moisture sensor 3 are arranged on the side wall of the columnar cylinder 1, probes of the moisture sensor and the tensiometer are inserted into a sample to be detected, the pressure sensor 11 is arranged between a loading rod 8 and a threaded rod of a hand wheel 10, the tensiometer 2, the moisture sensor 3 and the pressure sensor 11 are respectively connected with a data acquisition unit 20, and the data acquisition unit 20 transmits data signals to a computer 21 for acquisition and storage;
the weighing unit comprises a water supply device 15 and a weighing device 16 below a water storage device 26. The weighing device 16 is a micrometer electronic scale.
The permeable structure is permeable stone cushion layer and filter paper, the concave base 17 is paved with the permeable stone cushion layer 5, and the permeable stone cushion layer 5 is paved with the bottom filter paper 19. The bottom filter paper 19 is pre-moistened to avoid the effect of moisture absorption by the dry filter paper. The soil sample 27 to be detected is arranged on the bottom filter paper 19, and the filter paper 4, the permeable stone cushion 5 and the filter paper 4 are arranged on the top of the soil sample 27 to be detected in sequence.
The cylindrical barrel 1 is made of transparent organic glass, and the side wall of the cylindrical barrel is marked with a dimension line. A water sensor and a tension meter jack are reserved on the wall of the columnar cylinder 1, the water sensor and the tension meter are inserted into the jack, and sealing is carried out by means of glass cement. Tensiometer 2 and moisture sensor 3 equidistance from top to bottom arrange, and adjacent interval is 100mm, and tensiometer 2 and moisture sensor 3 respectively have four, and a tensiometer and a moisture sensor correspond the setting each other.
The water supply device 15 is arranged on an object carrying plate 30, the object carrying plate 30 is connected to a cross beam 28, the cross beam 28 is sleeved on a support frame 13, the support frame 13 contains a threaded rod, and two sides of the cross beam 28 are provided with positioning screws 29. The cross beam 28 can be adjusted in the position of the threaded rod through a set screw 29, and the height position of the carrying plate can be adjusted so as to stabilize and eliminate the position water head height.
The object carrying plate 30 is provided with two insert rods, the distance between the two insert rods is slightly larger than the height of the cross beam 28, the cross beam 28 is provided with clamping holes corresponding to the insert rods, the front ends of the insert rods are square, the rear ends of the insert rods are round rods with the diameter smaller than the side length of the square cross section of the front ends, the round rods are provided with threads, and the clamping holes are square holes; when the columnar cylinder 1 is vertically placed, the carrying plate 30 is inserted into the cross beam 28, the square section of the inserted rod enters the clamping hole, and the thread extends out of the clamping hole and is fastened by a nut; when the cylindrical barrel 1 is transversely placed, the object carrying plate 30 and the cross beam 28 are clamped, the cross beam 28 is perpendicular to the ground, a gap between the two inserted rods is clamped on the cross beam 28, and the nut of the threaded section is screwed tightly, so that the object carrying plate 30 and the cross beam 28 are firmly fixed.
The loading base 6 is an aluminum alloy metal circular plate, and the diameter of the loading base is slightly smaller than that of the columnar cylinder 1. A round hole is formed in the circle center of the aluminum alloy metal circular plate, and the diameter of the round hole is slightly larger than the outer diameter of the rubber hose. The rubber hose is connected with the round hole in a sealing mode. Its advantage does: the aluminum alloy is not easy to corrode; carry out sealing connection with rubber hose and metal sheet round hole, can avoid producing extra flood peak pressure, influence the experimental result, in the side direction rivers infiltration experiment, can eliminate the position flood peak influence.
The water supply device 15 can adopt a Mariotte bottle.
The outlet openings 34 are arranged uniformly along a circumference, each of which has a fan shape and has a diameter whose width is 1/3 of the radius of the loading base 6.
The upper section of the loading rod 8 is a cylindrical straight rod, the lower section of the loading rod is a three-toe base, and the middle part of the loading rod is a circular expansion plate.
Further, the method comprises the following steps: the lower part of the supporting base 14 is connected with two horizontal adjusting feet 31 and two rubber feet 32, and the side surfaces of the supporting base 14 and the loading top plate 12 are respectively connected with the two horizontal adjusting feet 31 and the two rubber feet 32; the horizontal adjusting foot 31 and the rubber foot 32 which are connected with the lower part of the supporting base 14 are used for adjusting the state level when the columnar cylinder 1 keeps vertical; the horizontal adjusting feet 31 and the rubber feet 32 connected to the side surfaces of the supporting base 14 and the loading top plate 12 are used for adjusting the state level when the cylindrical drum 1 is kept in the transverse direction. And when the cylindrical barrel 1 is kept horizontal, a rubber waterproof gasket is arranged between the inner wall of the cylindrical barrel and the peripheral edge of the loading base for sealing and seepage-proofing treatment.
Claims (10)
1. A device for measuring the permeability coefficient and the expansive force of unsaturated expansive soil is characterized by comprising a sample chamber, a supporting mechanism, a loading mechanism, a water supply system, a data acquisition system and a weighing unit, wherein the sample chamber is a cylindrical barrel (1), a top cover (9) is arranged at the top of the cylindrical barrel (1), a concave base (17) is arranged at the bottom of the cylindrical barrel, a middle round hole (25) is formed in the concave base (17), a soil sample (27) to be measured is contained in the cylindrical barrel (1), a water permeable structure is paved at the bottom of the cylindrical barrel (1), the soil sample (27) to be measured is arranged on the water permeable structure, and the top of the soil sample (27) to be measured is also;
the supporting mechanism is provided with a loading top plate (12), a supporting frame (13) and a supporting base (14), the supporting frame (13) is fixed on the supporting base (14), the loading top plate (12) is connected onto the supporting frame (13), and a sunken base (17) is fixedly connected onto the supporting base (14) through a fixing bolt and a fixing nut (33);
the loading mechanism is provided with a loading base (6), a loading rod (8) and a hand wheel (10), the loading base (6) is positioned above the top water permeable structure in the cylindrical barrel (1), a water injection hole (7) is arranged at the central position of the loading base (6), a hollow part is arranged on the loading base (6), the hollow part forms an exhaust hole (34), a waterproof breathable film (35) is arranged at the bottom surface of the loading base (6), a round hole with the diameter larger than or equal to that of the water injection hole (7) is arranged at the central position of the waterproof breathable film (35), a loading rod (8) is arranged above the loading base (6), the loading rod (8) penetrates through the top cover (9) in a sliding manner to be connected with a hand wheel (10), a pressure sensor (11) is arranged between the loading rod (8) and the hand wheel (10), the hand wheel (10) is provided with a threaded rod, and the threaded rod penetrates through a middle threaded hole of the loading top plate (12);
the water supply system comprises a water supply device (15), a water storage device (26), a water inlet component and a water drainage component, wherein the water inlet component comprises a water inlet pipe (22) and a rubber hose (23), one end of the water inlet pipe (22) is connected with the water supply device (15), the other end of the water inlet pipe (22) penetrates through the cylindrical barrel (1), the rubber hose (23) is connected with the water inlet pipe (22) and the water injection hole (7), the water drainage component comprises a water outlet pipe (24) of which one end is connected with a middle round hole (25) of the concave base (17), the other end of the water outlet pipe (24) is connected with the water storage device (26), and a valve (;
the data acquisition system comprises a tensiometer (2), a moisture sensor (3) and a pressure sensor (11), wherein the tensiometer (2) and the moisture sensor (3) are arranged on the side wall of the cylindrical barrel (1), the pressure sensor (11) is arranged between a loading rod (8) and a threaded rod of a hand wheel (10), the tensiometer (2), the moisture sensor (3) and the pressure sensor (11) are respectively connected with a data acquisition unit (20), and the data acquisition unit (20) transmits data signals to a computer (21) for acquisition and storage; the weighing unit comprises a water supply device (15) and a weighing device (16) below the water storage device (26).
2. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the structure of permeating water is for permeating water stone bed course, filter paper, and sunken shape base (17) are spread and have been permeated water stone bed course (5), and spread bottom filter paper (19) on permeating water stone bed course (5), be on bottom filter paper (19) and await measuring soil sample (27), what await measuring soil sample (27) top is filter paper (4), permeable stone bed course (5), filter paper (4) in proper order.
3. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the cylindrical barrel (1) is made of transparent organic glass, and the side wall of the cylindrical barrel is marked with a dimension line; tensiometer (2) and moisture sensor (3) equidistance from top to bottom arrange, adjacent interval is 100mm, tensiometer (2) and moisture sensor (3) respectively have four.
4. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the water supply device (15) is arranged on the object carrying plate (30), the object carrying plate (30) is connected to the cross beam (28), the cross beam (28) is sleeved on the support frame (13), the support frame (13) contains a threaded rod, and the position of the cross beam (28) is adjusted through a positioning screw (29) arranged on the threaded rod.
5. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 4, wherein: the object carrying plate (30) is provided with two insert rods, the distance between the two insert rods is slightly larger than the height of the cross beam (28), the cross beam (28) is provided with clamping holes corresponding to the insert rods, the front ends of the insert rods are square, the rear ends of the insert rods are round rods with the diameters smaller than the side length of the square cross sections of the front ends, the round rods are provided with threads, and the clamping holes are square holes; when the columnar cylinder (1) is vertically placed, the carrying plate (30) is inserted into the cross beam (28), the square section of the inserted rod enters the clamping hole, and the thread extends out of the clamping hole and is fastened by a nut; when the cylindrical barrel (1) is transversely placed, the object carrying plate (30) is clamped with the cross beam (28), the cross beam (28) is perpendicular to the ground, a gap between the two inserted rods is clamped on the cross beam (28), and the nut of the threaded section is screwed tightly, so that the object carrying plate (30) is firmly fixed with the cross beam (28).
6. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 5, wherein: the loading base (6) is an aluminum alloy metal circular plate, and the diameter of the loading base is slightly smaller than that of the cylindrical barrel (1).
7. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the weighing device (16) is a micrometer electronic scale.
8. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the exhaust holes (34) are uniformly distributed along a circumference, each exhaust hole is fan-shaped, and the width of the diameter of each exhaust hole is 1/4-1/3 of the radius of the loading base (6).
9. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the upper section of the loading rod (8) is a cylindrical straight rod, the lower section of the loading rod is a three-toe-shaped base, and the middle of the loading rod is an expansion plate.
10. The device for measuring the permeability coefficient and expansive force of unsaturated expansive soil according to claim 1, wherein: the lower part of the supporting base (14) is connected with a horizontal adjusting foot (31) and a rubber foot (32), and the side surfaces of the supporting base (14) and the loading top plate (12) are respectively connected with the horizontal adjusting foot (31) and the rubber foot (32); a horizontal adjusting foot (31) and a rubber foot (32) which are connected with the lower part of the supporting base (14) are used for adjusting the state level when the columnar cylinder (1) is kept vertical; the horizontal adjusting feet (31) and the rubber feet (32) which are connected with the lateral sides of the supporting base (14) and the loading top plate (12) are used for adjusting the state and the level of the cylindrical barrel (1) when the cylindrical barrel is kept to be horizontal.
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| CN202020633041.5U CN212514158U (en) | 2020-04-24 | 2020-04-24 | Unsaturated expansive soil permeability coefficient and expansive force measuring device |
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| CN202020633041.5U CN212514158U (en) | 2020-04-24 | 2020-04-24 | Unsaturated expansive soil permeability coefficient and expansive force measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447413A (en) * | 2021-05-19 | 2021-09-28 | 中国电建集团西北勘测设计研究院有限公司 | Unsaturated loess osmotic coefficient curve testing arrangement of steerable stress condition |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447413A (en) * | 2021-05-19 | 2021-09-28 | 中国电建集团西北勘测设计研究院有限公司 | Unsaturated loess osmotic coefficient curve testing arrangement of steerable stress condition |
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