CN215178741U

CN215178741U - Sampling device

Info

Publication number: CN215178741U
Application number: CN202120899335.7U
Authority: CN
Inventors: 郑星; 耿传浩; 魏伟琼; 杨文超; 徐永旺
Original assignee: PowerChina Guiyang Engineering Corp Ltd
Current assignee: PowerChina Guiyang Engineering Corp Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-12-14
Anticipated expiration: 2031-04-28

Abstract

The utility model provides a sampling device, which comprises an upper shearing box, a lower shearing box and an earth-entering cutting ring; the upper shearing box, the lower shearing box and the soil-entering cutting ring are axially connected through a movable bolt; a seam is reserved between the upper shearing box and the lower shearing box, and no gap is reserved between the lower shearing box and the soil-entering cutting ring; the lower end of the soil-entering cutting ring is in a cutter-edge shape. The utility model discloses can acquire the large size undisturbed sample of the soil body or extremely soft rock, the mode that the sample process adopted slowly to impress has avoided artifical excavation or indoor secondary sample to the disturbance of original state sample to can be directly used for indoor direct shear test with the sample of taking out and do not need secondary operation, the disturbance to the sample has been avoided to the at utmost.

Description

Sampling device

Technical Field

The utility model relates to a sampling device belongs to geotechnical engineering geotechnical test technical field, concretely relates to a sampling device that is used for soil body or extremely soft rock direct shear experimental original state undisturbed sample.

Background

The mechanical test parameters of the rock structural surface, particularly the shear strength parameters, are important for the anti-sliding stability of buildings, side slopes, foundations and the like. Thus, engineers have been working to obtain reasonable shear strength parameters of structural surfaces to evaluate the strength of geotechnical bodies. At present, the method for acquiring the shear strength parameter of the rock structural surface mainly adopts a large-scale on-site in-situ shear test, or a structural surface sample is taken back indoors for an indoor test. However, the use of large in-situ shearing in the field often requires excavation of test footrills, or the test site is difficult to reach, which makes the test work extremely difficult, resulting in long test period and high cost. The sampling of the rock mass structural plane is often required to be kept undisturbed. However, the rock mass structural plane is easy to disturb and destroy the original structural system in the sampling operation, so that the sampling of the original rock mass structural plane is difficult, and even the sampling fails. Particularly, in the test of the rock mass structural plane, the test simulation needs to be carried out aiming at the in-situ stress direction of the structural plane, so that the extremely high requirement is provided for the sampling of the rock mass structural plane.

The current method for obtaining undisturbed samples of soil and soft rock shear tests is mainly a method for manually taking block-shaped samples to carry out secondary processing indoors. The method can only sample clay and extremely soft rock firstly, and the sampling process involves operations such as digging, chiseling and hammering, and the like, so that the disturbance on the sample is large. Secondly, the sampling method is to take a block sample back and perform cutting ring sampling indoors for fine soil with fine soil particles, and the obtained sample is small in size. Other samples retrieved by adopting a drilling sampling mode also have the problem that only fine soil samples can be taken, and the obtained samples are small in size.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model provides a sampling device, this sampling device have mainly solved the problem that ground body scene normal position shear test is long consuming time, the expense is high and ordinary sampling method is difficult to acquire original state non-disturbance appearance.

The utility model discloses a following technical scheme can realize.

The utility model provides a sampling device, which comprises an upper shearing box, a lower shearing box and an earth-entering cutting ring; the upper shearing box, the lower shearing box and the soil-entering cutting ring are axially connected through a movable bolt; a seam is reserved between the upper shearing box and the lower shearing box, and no gap is reserved between the lower shearing box and the soil-entering cutting ring; the lower end of the soil-entering cutting ring is in a cutter-edge shape.

The movable bolt has a plurality of.

The diameters of the upper shearing box, the lower shearing box and the soil-entering cutting ring are consistent with the wall thickness.

The height of the soil-entering cutting ring is lower than that of the upper shearing box and the lower shearing box.

The upper shearing box, the lower shearing box and the soil-entering cutting ring are all steel rings.

And the two end faces of the upper shearing box and the lower shearing box are bound and covered by rubber molds or plastic films.

The beneficial effects of the utility model reside in that: the large-size undisturbed sample of the soil body or the extremely soft rock can be obtained, the sampling process adopts a slow pressing mode, the disturbance of manual excavation or indoor secondary sampling to the original sample is avoided, the taken sample can be directly used for an indoor direct shear test without secondary processing, and the disturbance to the sample is avoided to the maximum extent.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic diagram of the sampling process of the present invention;

FIG. 3 is a schematic diagram of the post-sampling indoor shear test of the present invention;

in the figure: 1-upper shearing box, 2-lower shearing box, 3-soil-entering cutting ring, 4-movable bolt and 5-slit.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

Example 1

As shown in fig. 1, the sampling device comprises an upper shearing box 1, a lower shearing box 2 and an earth-penetrating cutting ring 3; the upper shearing box 1, the lower shearing box 2 and the soil-entering cutting ring 3 are axially connected through a movable bolt 4; a seam 5 is reserved between the upper shearing box 1 and the lower shearing box 2, and no gap is reserved between the lower shearing box 2 and the soil-entering cutting ring 3; the lower end of the soil-entering cutting ring 3 is in a knife edge shape.

Example 2

The protocol of example 1 was followed and: the number of the movable bolts 4 is multiple.

Example 3

The protocol of example 1 was followed and: the diameters of the upper shearing box 1, the lower shearing box 2 and the soil-entering cutting ring 3 are consistent with the wall thickness.

Example 4

The protocol of example 1 was followed and: the height of the soil-entering cutting ring 3 is lower than that of the upper shearing box 1 and the lower shearing box 2.

Example 5

The protocol of example 1 was followed and: the upper shearing box 1, the lower shearing box 2 and the soil-entering cutting ring 3 are all steel rings.

Example 6

The protocol of example 1 was followed and: the two end faces of the upper shearing box and the lower shearing box are tied up and covered by rubber molds or plastic films

Example 7

Based on the above embodiment, specifically: the device is formed by axially combining three steel rings with the same diameter, as shown in the attached figure 1. The upper sampling box (or called upper shearing box) and the lower sampling box (or called lower shearing box) are steel rings with the same size, the wall thickness is about 10mm, and the diameter can be freely determined to be about 200-400 mm. The upper sampling box and the lower sampling box are axially connected together through a movable bolt on the outer wall, a gap (slit) of about 10mm is reserved between the upper sampling box and the lower sampling box, and the gap is used as a shear slit of a later-stage shear test. The other steel ring is also called as an earth-entering cutting ring, the wall thickness and the diameter of the other steel ring are consistent with those of the two steel rings at the upper part, but the height of the other steel ring is smaller, the other steel ring is fixed with the lower sampling box through a movable bolt, no seam is left in the middle, and the lowest end of the other steel ring is in a sharp knife edge shape, so that the other steel ring can be conveniently cut into a soil body or a rock body during sampling.

The utility model discloses can regard as indoor shear test device, be about to the sample and take back the back from the scene and directly test on the device, will go up the sample box as last shearing box, lower sample box is as lower shearing box, as long as fix lower shearing box, carries out normal pressure to the soil body and applys on indoor pressure equipment, and the shearing box can carry out shear test on the horizontal promotion, as shown in attached 3. Because the sample is always in the sampling device during sampling and testing without additional processing, the original state of the sample can be ensured to the maximum extent.

Example 8

From the above, during sampling, the three steel rings are sequentially connected by the movable bolts, the connected sampling device is placed on a target sampling rock-soil layer, the device is pressed into a rock-soil body by external force, as shown in the attached figure 2, the rock-soil body outside the steel rings is dug out, and the steel rings and samples in the rings are taken out in a small-sized mode; and taking down a movable bolt for connecting the lower sampling box and the soil-entering cutting ring, taking down the soil-entering cutting ring, flattening the samples at the two steel ring ends of the upper sampling box and the lower sampling box, and binding and covering the joint of the upper end surface of the upper sampling box, the lower end surface of the lower sampling box and the middle seam of the upper sampling box and the lower sampling box by using a rubber mold or a plastic film in order to prevent the water loss of the samples.

After the sample is transported back to the room, the sampling device and the internal sample are installed on the testing equipment, the lower sampling box (lower shearing box) is fixed, the movable bolt which is connected with the upper sampling box and the lower sampling box is taken out, the soil sample is pressurized by the pressurizing equipment, and the horizontal shearing force is applied to the upper shearing box, so that the shearing test can be completed.

To sum up, adopt the utility model discloses can be directly to the soil body include fine grain soil and contain the gravel soil and the extremely soft rock of certain size gravel and take a sample, the sample size that this device was taken is great, can guarantee that the sample of getting has great size, and the sample of retailing can directly test in this device, need not to carry out indoor secondary operation, and the disturbance of conventional sampling method to the sample has been avoided to the at utmost.

Claims

1. The utility model provides a sampling device, includes upper shear box (1), lower shear box (2), burial cutting ring (3), its characterized in that: the upper shearing box (1), the lower shearing box (2) and the soil-entering cutting ring (3) are sequentially and axially connected through a movable bolt (4); a slot (5) is reserved between the upper shearing box (1) and the lower shearing box (2), and no gap is reserved between the lower shearing box (2) and the soil-entering cutting ring (3); the lower end of the soil-entering cutting ring (3) is in a cutter-edge shape.

2. The sampling device of claim 1, wherein: the number of the movable bolts (4) is multiple.

3. The sampling device of claim 1, wherein: the diameters of the upper shearing box (1), the lower shearing box (2) and the soil-entering cutting ring (3) are consistent with the wall thickness.

4. The sampling device of claim 1, wherein: the height of the soil-entering cutting ring (3) is lower than that of the upper shearing box (1) and the lower shearing box (2).

5. The sampling device of claim 1, wherein: the upper shearing box (1), the lower shearing box (2) and the soil-entering cutting ring (3) are all steel rings.

6. The sampling device of claim 1, wherein: the two end faces of the upper shearing box (1) and the lower shearing box (2) are respectively bound and covered by a rubber mold or a plastic film.