CN202974742U - Low liquid limit silty soil triaxial sampler - Google Patents

Abstract

The utility model relates to a geotechnical mechanics triaxial test sample preparation technical field discloses a low liquid limit silty soil triaxial system appearance ware, including sample cylinder, evener, vibrator and loader, and the sample cylinder includes the base, to the mould fixed plate, increase-volume section of thick bamboo fixed plate, and the evener includes a word protruding end, guide arm, and the vibrator includes combined vibrating head, threaded rod, locating plate, mounting plate, holding plate, auxiliary positioning board, and the loader includes loading head, threaded rod, locating plate, mounting plate, second air guide guiding water guide hole; an exhaust groove is engraved in the split mold, and a convex groove and a concave groove are respectively arranged at two ends of the exhaust groove and are communicated with the sealing strip; the side wall of the loading head is provided with a sealing ring, and the threaded rod is internally provided with a water guide channel and is connected with the air guide and water guide hole. The utility model provides a problem of preparation silty soil homogeneous sample, will split the mould location, sealed close as an organic whole, improve sample size precision and sealed effect to can with current triaxial apparatus phase-match, reduce the equipment input.

Description

Low liquid limit silty soil triaxial sampler

technical field

The utility model relates to the technical field of rock and soil mechanics triaxial test sample preparation, in particular to a low liquid limit silty soil triaxial sample preparation device.

Background technique

Silty soil is a transitional type between sandy soil and clayey soil. It is widely distributed in my country. This type of soil has poor stability, is easy to be scoured and eroded, and is easy to liquefy under various dynamic loads. In the case of natural disasters, the corresponding geological disasters seriously affect the development of the national economy and the stable life of the people, so the research on low liquid limit silty soil is urgent. Limited to the limitations of in-situ tests on site, general indoor tests are the main means of related research, and uniform samples are the necessary basis for obtaining stable and reliable test data and ensuring research results.

Contents of the invention

The purpose of this utility model is: in order to solve the above-mentioned technical problem in the prior art, provide a kind of economical, reliable low liquid limit silty soil triaxial sample preparation device, it can improve the homogeneity of silty soil sample, reduce The impact of human factors on the sample, and the density of the sample is controlled through the existing triaxial test equipment, reducing the requirement for equipment investment.

In order to achieve the above object, the utility model adopts the following technical scheme: a triaxial sample preparation device for low liquid limit silty soil is provided, including: a sample cylinder, a leveler, a vibrator and a loader;

The sample cylinder further includes: a base 1, a split mold 2, a split mold fixing plate 3, an expansion cylinder 14, and a volume expansion cylinder fixing plate 15; the two ends of the base 1 are provided with threaded circular grooves 33, and the center is provided with a circular groove. Shaped boss, the center vertical line between the circular boss and the side of the base is provided with a first air guide and water guide channel, and the outlet of the first air guide and water guide channel is provided with a first air guide and water guide hole 4; split mold 2 The lower end is matched with the circular boss, and the upper end of the split mold 2 is matched with the lower end of the expansion cylinder 14; the fixed rod 12 is fixed on the base 1 by screwing into the threaded circular groove 33; Both ends of the barrel fixing plate 15 are provided with through holes, and the fixing plate passes through the fixing rod 12 successively and is respectively placed on the flange of the split mold and the expansion barrel, and is fixed with nuts 13; the split mold fixing plate 3 connects the base 1 It is fixed together with the split mold 2, and the expansion cylinder fixing plate 15 fixes the split mold 2 and the expansion cylinder 14 together;

The leveler further includes: a straight convex end 16 and a guide rod 17, both of which are connected by threads;

The vibrator further comprises: a joint vibrator head 18, a first threaded rod 19, a first positioning plate 20, a first fastening piece 21, an auxiliary positioning plate 22; Threaded connection, the upper end is threaded with the auxiliary positioning plate 22, and the first positioning plate 20 and the first fastening piece 21 move freely on the first threaded rod 19;

The loader is put into the expansion cylinder, and further includes: a loading head 23, a second threaded rod 24, a second positioning plate 25, a second fastening piece 26, a second air guide and water guide hole 27, the loading head 23 and the The lower end of the second threaded rod 24 is screwed, the upper end of the second threaded rod 24 is provided with a second air guide and water guide hole 27 , and the second positioning plate 25 and the second fastening piece 26 are free to move on the second threaded rod 24 .

Wherein, the split mold 2 is composed of two semicircular metal sheets with a central angle of 180°. At the connection, one end is provided with a convex groove 9, and the other end is provided with a first groove 8, and the convex groove 9 and the first concave groove are connected. Corresponding to the groove 8, the convex groove 9 is about 0.5 mm longer than the first groove 8, and the first groove 8 communicates with the rubber sealing round bar 10 with a diameter of 3 mm.

Wherein, the middle position of the outer side of the split mold 2 is provided with an air suction hole 5, and the inner side of the split mold 2 is engraved with a number of 1.5mm wide and 1.5mm deep exhaust grooves, and the longitudinal exhaust grooves 6 are spaced at 60°, arranged circumferentially. The air grooves 7 are separated by 15 mm, and the longitudinal exhaust grooves 6 and the circumferential exhaust grooves 7 intersect at the suction holes 5 .

Wherein, the combined vibrating head 18 is composed of a 20mm high elastic rubber cylindrical block and a 20mm white steel cylindrical block.

Wherein, two sealing rings 29 are arranged on the side wall of the loading head 23 of the loader, the first water-permeable stone 30 is embedded in the lower end, a curved groove 31 is arranged on the upper end of the second threaded rod 24, and a second guiding guide is arranged in the second threaded rod 24. The air-guided water channel 28, and the second air-guided water-guided channel 28 is provided with a second air-guided water-guided hole 27.

When the low liquid limit silty soil triaxial sampler prepares samples, the rubber film is first put on the split mold 2, and the vacuum is passed through the suction hole 5 to make the rubber film adhere to the inner wall of the split mold 2; the split mold Put the second permeable stone and filter paper in 2, pour the air-dried soil into the split mold 2 one by one, use a leveler to level it each time, and then use a vibrator to control the initial dry density to a predetermined height; the lower end of the loading head 23 In contact with the surface of the soil layer, filter paper is placed between the two, the curved groove 31 at the upper end of the second threaded rod 24 is in contact with the measuring ring of the three-axis equipment, and then carbon dioxide is first passed through the first air guide and water guide hole 4 of the base 1 , and then pass through the sample saturated with air-free water; calculate and consolidate the sample to a predetermined height according to the secondary dry density, then remove the loader, the expansion cylinder 14, and the base 1 in sequence, and cut off the excess soil to complete the sample production; The completed sample should be placed on the test equipment and then the split mold 2 should be removed to eliminate the secondary disturbance of the sample caused by the rubber membrane, and then the relevant saturation test should be carried out directly.

The beneficial effects of the utility model are: the utility model solves the problem of making a uniform sample of silty soil, which integrates the positioning and sealing of the split mold, improves the dimensional accuracy and sealing effect of the sample, and can be compared with the existing The triaxial instrument is matched to reduce equipment investment; through the two-level control of initial dry density and secondary dry density, the density of the sample can be arbitrarily specified within a certain range; the rubber-steel combined vibrating head is used to effectively improve the vibration encryption effect; During the whole sample preparation process, the sample is protected by the open mold, which effectively reduces the influence of human factors, and the preset rubber film eliminates the secondary disturbance of the sample during the process of covering the rubber film. The utility model is not only convenient to use, but also has precise density control, no secondary disturbance of the sample, and is suitable for various triaxial tests.

Description of drawings

Fig. 1 is the front view of the utility model low liquid limit silty soil triaxial sample preparation device.

Fig. 2 is the front view of the split mold of the present utility model.

Fig. 3 is the top view of the split mold of the present invention.

Fig. 4 is a structural schematic diagram of the leveler of the present invention.

Fig. 5 is a structural schematic diagram of the vibrator of the present invention.

Drawings: 1-base, 2-split mold, 3-split mold fixing plate, 4-first air guide and water guide hole, 5-suction hole, 6-longitudinal exhaust groove, 7-circular row Air groove, 8-first groove, 9-convex groove, 10-rubber sealing round bar, 11-bolt, 12-fixing rod, 13-nut, 14-increasing cylinder, 15-increasing cylinder fixing plate, 16 - Slotted convex end, 17-Guide rod, 18-Combined vibrating head, 19-First threaded rod, 20-First positioning plate, 21-First fastening piece, 22-Auxiliary positioning plate, 23-Loading Head, 24-the second threaded rod, 25-the second positioning plate, 26-the second fastening piece, 27-the second air guide and water guide hole, 28-the second air guide and water guide channel, 29-sealing ring, 30 -the first water-permeable stone, 31-curved groove, 32-the first air and water guide channel, 33-thread circular groove.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing and embodiment.

Referring to Figures 1-5, the utility model is a triaxial sample preparation device for low liquid limit silty soil, including: a sample cylinder, a leveler, a vibrator and a loader;

The sample cylinder further includes: a base 1, a split mold 2, a split mold fixing plate 3, an expansion cylinder 14, and a volume expansion cylinder fixing plate 15; the two ends of the base 1 are provided with threaded circular grooves 33, and the center is provided with a circular groove. Shaped boss, the center vertical line between the circular boss and the side of the base is provided with a first air guide and water guide channel, and the outlet of the first air guide and water guide channel is provided with a first air guide and water guide hole 4; split mold 2 The lower end is matched with the circular boss, the upper end of the split mold 2 is matched with the lower end of the expansion cylinder 14, and the split mold 2 is clamped by bolts 11; the fixed rod 12 is fixed on the base 1 by screwing into the threaded circular groove 33 The split mold fixed plate 3 and the expansion cylinder fixed plate 15 are shuttle-shaped, and there are through holes at both ends of the long axis, and are matched with the fixed rod 12, and the fixed plate passes through the fixed rod 12 successively and is placed between the split mold and the increased capacity. on the flange of the container, and fixed with nuts 13; the split mold fixing plate 3 fixes the base 1 and the split mold 2 together, and the expansion tube fixing plate 15 fixes the split mold 2 and the expansion tube 14 together;

The leveler further includes: a straight convex end 16 and a guide rod 17, both of which are connected by threads;

The vibrator further comprises: a joint vibrator head 18, a first threaded rod 19, a first positioning plate 20, a first fastening piece 21, an auxiliary positioning plate 22; Threaded connection, the upper end is threaded with the auxiliary positioning plate 22, and the first positioning plate 20 and the first fastening piece 21 move freely on the first threaded rod 19;

The loader further includes: a loading head 23, a second threaded rod 24, a second positioning plate 25, a second fastening piece 26, a second air guide and water guide hole 27, and the loading head 23 is threaded with the lower end of the second threaded rod 24. connected, the second threaded rod 24 upper end is provided with a second air guide and water guide hole 27, and the second positioning plate 25 and the second fastening piece 26 are free to move on the second threaded rod 24.

Wherein, the split mold 2 is composed of two semicircular metal sheets with a central angle of 180°. At the connection, one end is provided with a convex groove 9, and the other end is provided with a first groove 8, and the convex groove 9 and the first concave groove are connected. Corresponding to the groove 8, the convex groove 9 is about 0.5 mm longer than the first groove 8, and the first groove 8 communicates with the rubber sealing round bar 10 with a diameter of 3 mm. sample size and shape.

Wherein, the middle position of the outer side of the split mold 2 is provided with an air suction hole 5, and the inner side of the split mold 2 is engraved with a number of 1.5mm wide and 1.5mm deep exhaust grooves, and the longitudinal exhaust grooves 6 are spaced at 60°, arranged circumferentially. The air grooves 7 are separated by 15mm. When the vacuum is drawn by the suction hole 5, the exhaust grooves can ensure that the rubber film and the split mold 2 are closely connected together. intersect.

Wherein, the combined vibrating head 18 is composed of a 20mm high elastic rubber cylindrical block and a 20mm white steel cylindrical block, which are connected together by three bolts, wherein the high elastic rubber will effectively transmit vibration to ensure the soil sample encryption effect.

Wherein, two sealing rings 29 are arranged on the side wall of the loading head 23 of the loader, the first water-permeable stone 30 is embedded in the lower end, a curved groove 31 is arranged on the upper end of the second threaded rod 24, and a second guiding guide is arranged in the second threaded rod 24. The air-guided water channel 28, and the second air-guided water channel 28 outlet is provided with a second air-guided water hole 27, and the curved groove 31 on the upper end of the second threaded rod 24 is matched with the measuring ring of the three-axis device.

In the sample preparation of the utility model, the rubber film is first put on the split mold 2, and the vacuum is passed through the suction hole 5 so that the rubber film is closely attached to the inner wall of the split mold 2; the second permeable stone is placed in the split mold 2 and filter paper, pour the air-dried soil into the split mold 2 one by one, use a leveler to level it each time, and then use a vibrator to control the initial dry density to a predetermined height; the lower end of the loading head 23 is in contact with the surface of the soil layer, and both Filter paper is placed between them, the curved groove 31 on the upper end of the second threaded rod 24 is in contact with the measuring ring of the triaxial device, and then the first air-conducting and water-conducting hole 4 of the base 1 is passed through the carbon dioxide first, and then through the airless water saturation test. Calculate and consolidate the sample to a predetermined height according to the secondary dry density, and then remove the loader, the expansion cylinder 14, and the base 1 in sequence, and cut off excess soil to complete the sample production; the completed sample should be placed in the test Remove the split mold 2 on the equipment to eliminate the secondary disturbance of the sample caused by the rubber membrane, and then directly carry out the relevant saturation test.

The above content is a further detailed description of the present invention in combination with preferred technical solutions, and it cannot be assumed that the specific implementation of the invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, simple deduction and substitutions can be made without departing from the concept of the present invention, which should be regarded as the protection scope of the present invention.

Claims (6)

1. low liquid limit slity soil three axle sample preparation devices, is characterized in that, described low liquid limit slity soil three axle sample preparation devices comprise: test specimen tube, smoother, vibrator and loader;

Described test specimen tube further comprises: base (1), split cavity (2), split cavity fixed head (3), increase-volume cylinder (14), increase-volume cylinder fixed head (15); Base (1) two ends are provided with screw thread circular groove (33), and the center is provided with round boss, and the central vertical line place of round boss and chassis side arranges the first conduit pipe (32), and the first conduit pipe (32) exit is provided with the first air guide water-guiding hole (4); Split cavity (2) lower end and described round boss are complementary, and split cavity (2) upper end and increase-volume cylinder (14) lower end are complementary; Fixed bar (12) is fixed on base (1) by screwing in screw thread circular groove (33); Split cavity fixed head (3) is equipped with through hole with increase-volume cylinder fixed head (15) two ends, fixed head pass successively fixed bar (12) and be placed on respectively split cavity with the flange of increase-volume cylinder on, and fix with nut (13).

2. low liquid limit slity soil three axle sample preparation devices according to claim 1, is characterized in that, described smoother further comprises: a word nose head (16), guide rod (17), and both are threaded connection;

Described vibrator further comprises: associating vibrator (18), the first threaded rod (19), the first location-plate (20), the first connecting plate (21), auxiliary positioning plate (22); The first threaded rod (19) lower end is threaded with associating vibrator (18), and the upper end is threaded with auxiliary positioning plate (22), and the first location-plate (20) moves freely on the first threaded rod (19) with the first connecting plate (21);

Described loader is put into the increase-volume cylinder, further comprise: loading head (23), the second threaded rod (24), the second location-plate (25), the second connecting plate (26), the second air guide water-guiding hole (27), loading head (23) is threaded with the second threaded rod (24) lower end, the second threaded rod (24) upper end arranges the second air guide water-guiding hole (27), and the second location-plate (25) moves freely on the second threaded rod (24) with the second connecting plate (26).

3. low liquid limit slity soil three axle sample preparation devices according to claim 1, it is characterized in that, described split cavity (2) is that the semicircle sheet metal of 180 ° forms by two central angles, its junction, one end arranges tongue (9), and the other end arranges the first groove (8), and tongue (9) is corresponding with the first groove (8), tongue (9) is longer than the first groove (8) 0.5mm, and the first groove (8) communicates with diameter 3mm rubber seal circle bar (10).

4. low liquid limit slity soil three axle sample preparation devices according to claim 1, it is characterized in that, centre position, described split cavity (2) outside is provided with suction hole (5), the air discharge duct that some 1.5mm are wide, 1.5mm is dark is carved with in split cavity (2) inboard, vertically air discharge duct (6) interval is 60 °, hoop air discharge duct (7) interval 15mm, vertically air discharge duct (6) is located to intersect at suction hole (5) with hoop air discharge duct (7).

5. low liquid limit slity soil three axle sample preparation devices according to claim 1, is characterized in that, described associating vibrator (18) is comprised of 20mm high elastic rubber cylindrical piece and the white steel cylindrical piece of 20mm.

6. low liquid limit slity soil three axle sample preparation devices according to claim 1, it is characterized in that, the loading head of described loader (23) sidewall arranges two seals circle (29), embedded the first permeable stone in lower end (30), the second threaded rod (24) upper end arranges curved groove (31), establish the second air guide conduit pipe (28) in the second threaded rod (24), and the second air guide conduit pipe (28) exit is provided with the second air guide water-guiding hole (27).

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