CN106610353A - Device used for preparing triaxial test samples via layer-compacting - Google Patents

Abstract

The invention discloses a device for preparing a triaxial test sample by using a layered compaction method, and relates to an indoor triaxial test sample preparation device. The present invention includes a soil sample compactor, a soil sample compactor and a limit module; the soil sample compactor is movably fixed in the sample hole on the main body base of the soil sample compactor, and the limit module and The pressure hammer on the soil sample compactor is movable and fixed. The invention improves and innovates the traditional soil sample compactor, which makes the new instrument simple in structure and low in cost, and can ensure that the thickness of each layer of the sample is uniform and the relative density of each soil layer is uniform, and different layer heights and layers can be prepared according to requirements. and the compactor designed based on the principle of leverage has the advantages of saving time and labor, which greatly meets the requirements for making remodeling samples.

Description

Apparatus for preparing triaxial test specimens by layer compaction

technical field

The invention relates to an indoor triaxial test sample preparation device, in particular to a device for preparing a triaxial test sample by layered compaction method.

Background technique

In geotechnical tests, both the original sample and the remodeled sample are given equal importance. The original sample reflects the natural structure and real mechanical properties of the soil, but it also has the disadvantages of difficult sampling, small number of samples, uneven samples, and inconvenient scientific research; Compared with the original sample, the reshaped soil sample has greater advantages in the number of samples, test control conditions, test time, and sample uniformity. Therefore, the reshaped soil sample has stronger and more universal application in geotechnical tests. sex.

The key to reshape the sample is to choose an instrument with high precision, which can flexibly control the relative density and uniformity of the reshaped sample, and is easy to operate. The traditional three-axis reshaping compactors are divided into two types: one is a one-time forming compactor (such as a jack), which can ensure that the sample is formed at one time, but there is a fatal drawback: the made The density of the sample is not uniform, and the phenomenon of "tightening at the top and loosening at the bottom" appears, resulting in the sample not having good overall mechanical properties, the overall bearing capacity is reduced, and a certain amount of soil will be brought out during sample preparation, which will cause dryness of the prepared soil sample. The density produces a large error, which greatly reduces the test accuracy. The other is the common three-axis compaction instrument, which is improved on the basis of the one-time forming compactor. The method of layered compaction is used to reshape the sample, so that the sample is "tightened at the top and loosened at the bottom". , The phenomenon of poor overall performance has been improved, but when using this instrument as a compaction tool, it is difficult to control the thickness of each layer during sample preparation (you can only use a ruler to measure layer by layer), which brings great harm to the preparation of the sample. In addition, during the compaction process of each layer of soil samples, due to the large impact force generated, the service life of the instrument was shortened and the soil volume was lost, resulting in large errors in the test results. Therefore, it is necessary to design a new type of instrument for reshaping soil samples to avoid the above problems and improve the test accuracy.

Contents of the invention

The purpose of the present invention is to provide a new type of compaction device using layered compaction according to the problems existing in the soil sample forming in the geotechnical test, and analyze the principle of the traditional triaxial reshaping sample compactor. The device for preparing triaxial test samples by using the method, combined with the knowledge in the field of machinery and soil, successfully applied the simple compactor designed based on the principle of leverage to the compaction of soil samples, which improved the convenience of test operation and the accuracy of results .

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a device for preparing a triaxial test sample by layered compaction method, which is characterized in that it includes a soil sample compactor, a soil sample compactor and a limiter. bit module; the soil sample compactor includes a main body base, a column installed on the main body base with a plurality of handle hanging holes at different heights, a handle movably connected with the column through the handle hanging holes, and a movable installation There is a pressure rod with a pressure hammer in the middle of the handle; the soil sample compacting cylinder includes a base, a soil sample forming cylinder and a pressing plate, and the soil sample forming cylinder is formed by splicing a plurality of arc-shaped plates and fixing it with a circular hoop The base is provided with a groove for fixing the bottom of the soil sample forming cylinder, the pressure plate is provided with a through hole for fixing the top of the soil sample forming cylinder, and the pressure plate and the base are connected by bolts; the soil sample compaction cylinder is movable It is fixed in the sample hole on the main body base of the soil sample compactor, and the limit module is movably fixed with the pressure hammer on the soil sample compactor.

A further technical solution is to include a height booster, which is an annular cylinder with the same inner diameter as the soil sample forming cylinder.

A further technical solution is that the bottom of the limiting module can extend into the inside of the soil sample forming cylinder, and its top can be stuck outside the soil sample forming cylinder, and the bottom of the limiting module is provided with a circular horizontal surface .

A further technical solution is that there are three types of the limit modules, and their heights are different.

A further technical solution is that the limiting module and the pressure hammer on the soil sample compactor are fixed by magnetic force.

A further technical solution is that an absorbing magnet is arranged between the limiting module and the pressure hammer on the soil sample compactor.

A further technical solution is that the soil sample forming cylinder is formed by splicing three arc-shaped plates and fixing them with circular hoops.

A further technical solution is that the column is provided with two handle hanging holes at different heights.

A further technical solution is that the groove on the base is annular; the groove on the base is circular.

The beneficial effects produced by adopting the above technical scheme are: the present invention aims at the problems of low sample preparation precision, excessive impact force, short service life of the instrument, time-consuming and laborious, and large loss of soil volume existing in the traditional soil sample compactor. Improvement and innovation make the new instrument simple in structure and low in cost, and can ensure that the thickness of each layer of the sample is uniform and the relative density of each soil layer is uniform, and soil samples with different layer heights and layers can be prepared according to requirements; and the design is based on the principle of leverage The advanced compactor has the advantages of saving time and labor, avoiding the shortcomings of the traditional compaction method such as the short service life of the instrument and the loss of soil volume due to the impact force during the compaction process, which greatly meets the requirements of the remodeling sample production. Requirements: The soil sample compactor and the corresponding type of limit module are connected by magnetic force, so that the soil sample compactor and the limit module are integrated, which further ensures the accuracy and simplicity of the compaction process.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural representation of a soil sample compactor in the present invention;

Fig. 3 is a schematic structural diagram of a limit module in the present invention;

Fig. 4 is a structural schematic diagram of a soil sample compaction cylinder in the present invention;

Fig. 5 is a structural representation of the height-filling device in the present invention

Among them: 1, soil sample compactor; 1-1, main body base; 1-2, column; 1-3, pressure rod; 1-4, first handle hanging hole; 1-5, second handle hanging hole ;1-6, handle; 1-7, pressure hammer; 1-8, sample hole; 2, limit module; 3, soil sample compaction cylinder; 3-1, circular collar; 3-2, pressure plate ; 3-3, soil sample forming cylinder; 3-4, bolt; 3-5, base; 4, height booster.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

The present invention adopts a simple compactor designed based on the principle of leverage, and applies the knowledge in the mechanical field to the geotechnical test. The handle 1-6, the pressure rod 1-3, the pressure hammer 1-7, and the column 1-2 constitute a lever The equipment replaces the traditional method of compacting soil samples by a large impact force, and skillfully achieves the effect of saving time and effort.

As shown in Figure 1, the present invention includes a soil sample compactor 1, a soil sample compaction cylinder 3 and a limit module 2;

As shown in Figure 2, soil sample compactor 1 comprises main body base 1-1, is installed on main body base 1-1 and has the column 1-2 that is positioned at the handle hanging hole of a plurality of different heights, and column 1 -2 the handle 1-6 that is movably connected through the handle hanging hole, and the pressure rod 1-3 with the pressure hammer 1-7 that is movably installed in the middle of the handle 1-6;

As shown in Figure 3, the soil sample compacting cylinder 3 includes a base 3-5, a soil sample forming cylinder 3-3 and a pressing plate 3-2, and the soil sample forming cylinder 3-3 is made of a plurality of arc-shaped plates spliced through a circular sleeve. The hoop 3-1 is fixed, the base 3-5 is provided with a groove for fixing the bottom of the soil sample forming cylinder 3-3, the pressing plate 3-2 is provided with a through hole for fixing the top of the soil sample forming cylinder 3-3, and the pressing plate 3- 2 is connected with the base 3-5 through the bolt 3-4;

As shown in Figure 1, the soil sample compaction cylinder 3 is movably fixed in the sample hole 1-8 on the main body base 1-1 of the soil sample compactor 1 to prevent the soil sample compaction cylinder 3 from moving during the compaction process. For the damage caused to the soil sample, the limit module 2 and the pressure hammer 1-7 on the soil sample compactor 1 are movable and fixed.

As shown in Fig. 5, the present invention also includes a height booster 4, which is an annular cylinder with the same inner diameter as the soil sample forming cylinder 3-3.

Preferably, the bottom of the limit module 2 can extend into the inside of the soil sample forming cylinder 3-3, and its top can be stuck on the outside of the soil sample forming cylinder 3-3, and the bottom of the limit module 2 is provided with a circular level.

As shown in FIG. 4 , there are three kinds of limit modules 2 with different heights. Each limit module 2 is composed of three parts: the top is a cylinder with a diameter of 43.6mm (slightly larger than the inner diameter of the soil sample forming cylinder 3-3) and a height of 25mm; the bottom is a cylinder with a diameter of 38.3mm (slightly smaller than the inner diameter of the sample forming cylinder 3-3 Inner diameter), a round cake with a height of 5mm; the middle is a slender cylinder with a diameter of 18.5mm and a height of 15mm, 35mm, and 55mm.

The upper part of each kind of limiting module 2 is a "short and fat" cylinder whose diameter is slightly larger than the inner diameter of the upper end of the sample forming cylinder 3-3, and the lower part is a round cake whose diameter is slightly smaller than the inner diameter of the upper end of the sample forming cylinder 3-3. It can freely enter and exit the sample forming cylinder 3-3, with a slender column in the middle for force transmission;

In the present invention, the limiting module 2 and the pressure hammer 1-7 on the soil sample compactor 1 are fixed by magnetic force.

Preferably, an adsorptive magnet is arranged between the limit module 2 and the pressure hammer 1-7 on the soil sample compactor 1 .

The soil sample compactor 1 is magnetically connected to the corresponding model of the limit module 2, so that the soil sample compactor 1 and the limit module 2 are integrated to ensure the accuracy and simplicity of the compaction process. During compaction, the soil sample compactor 1 and the limiting module 2 move down due to the pressure, and when the required thickness of the soil layer is reached, the top part of the limiting module 2 will be stuck, and the compaction is completed.

Preferably, the soil sample forming cylinder 3-3 is formed by splicing three arc-shaped plates and fixing them with a circular hoop 3-1.

Preferably, the column 1-2 is provided with two handle hanging holes at different heights, which are respectively the first handle hanging hole 1-4 and the second handle hanging hole 1-5. When the number of layers of soil samples is 4 layers, when compacting the first, second, and third layers of soil samples, it is not necessary to use the height booster 4, then select the first handle hanging holes 1-4, and carry out the last layer of soil When the sample is pressed in real time, it is necessary to use the height booster 4. If the height is increased by 40mm, then select the second handle hanging hole 1-5. 2 is also just stuck, and the compaction of this layer of soil samples is completed;

Preferably, the groove on the base 3-5 is annular; the groove on the base 3-5 is circular. Used to place the soil sample forming cylinder 3-3 spliced by three arc-shaped plates;

The specific operation steps are as follows:

1. Splicing three arc-shaped plates into a cylinder, and fixing them with circular hoops to form a soil sample forming cylinder 3-3, the inner diameter of the soil sample forming cylinder 3-3 is 39.1 mm, and the height is 80 mm. The sample forming cylinder 3-3 is placed on the groove of the base 3-5, the pressure plate 3-2 is placed at the corresponding position on the top of the soil sample forming cylinder 3-3, and the pressure plate 3-2 is connected to the base through the vertical bolt 3-4. 3-5 are connected to form the soil sample compaction cylinder 3.

2. Place the soil sample compaction cylinder 3 in the sample hole 1-8 of the main body base 1-1 of the soil sample compactor 1 respectively, and fix them. At this time, place the handle 1-6 of the soil sample compactor 1 The hook is hung on the first handle hanging hole 1-4.

3. Weigh the mass of the first layer of soil sample to be compacted, put it into the soil sample compactor 3, fix the magnet on the soil sample compactor 1, and absorb the middle thin column with a height of 55mm (Cylinder height is 60mm) limit module 2, so that the right side of the force application handle 1-6 is lifted to a certain height, and pressed down firmly. At this time, due to the linkage effect of the pressure rod 1-3, the pressure hammer 1-7 and the limit module 2 move down, and the soil sample is compacted through the limit module 2. As the limit module 2 continues to move down, the top of the limit module 2 is stuck on the upper end of the soil sample compaction cylinder 3, and this is completed. The compaction of one layer of soil samples, the grooved hole on the handle 1-6 is also just stuck to the grooved position of the right column at this moment.

4. After the compaction is completed, remove the limit module 2 of this model, and scrape the first layer of soil samples.

5. Weigh the quality of the second layer of soil sample, and make the magnet on the soil sample compactor 1 absorb the limit module 2 with the middle thin column height of 35mm (the height of the cylinder is 40mm), and repeat steps 3 and 4.

6. Weigh the quality of the third layer of soil sample, and make the magnet on the soil sample compactor 1 absorb the limit module 2 with the middle thin column height of 15mm (the height of the cylinder is 20mm), and repeat steps 3 and 4.

7. Weigh the quality of the fourth layer of soil samples, place the height booster 4 on the upper end of the soil sample compactor 3 and make the magnet on the soil sample compactor 1 absorb the limit module 2 with a thin column height of 35mm in the middle At this time, hang the handle 1-6 of the soil sample compactor 1 to the second hanging hole 1-5, and repeat steps 3 and 4.

8. A triaxial sample that is compacted and formed in four layers is prepared. It is also possible to select the appropriate layer height and number of layers according to the experimental requirements, and take out the sample to ensure that the equipment is restored to its original state.

Claims (9)

1. a kind of utilization layer-compacting prepares the device of triaxial test sample, it is characterised in that： Including soil sample compactor, soil sample compacting cylinder and spacing module；The soil sample compacting cylinder includes main body Pedestal, it is on main base and vertical with multiple handle hanging holes positioned at differing heights Post, the handle being flexibly connected by handle hanging hole with column, and it is movably arranged on middle handle The depression bar with hammer；The soil sample compactor includes base, soil sample forming tube and pressing plate, The soil sample forming tube is fixed by multiple arcs plate splicing Jing circle cuffs and formed, the bottom Seat is provided with the groove of fixed soil sample forming tube bottom, and the pressing plate is provided with fixed soil sample forming tube top The through hole in portion, the pressing plate is bolted with base；The soil sample compacting cylinder activity is solid It is scheduled in the sample aperture on soil sample compactor main base, the spacing module and soil sample compactor On hammer activity fix.

2. utilization layer-compacting according to claim 1 prepares triaxial test sample Device, it is characterised in that：Also include mending high device, the high device of the benefit be one with soil sample forming tube Interior diameter identical circular cylinder.

3. utilization layer-compacting according to claim 1 prepares triaxial test sample Device, it is characterised in that：The bottom of the spacing module can stretch into the inside of soil sample forming tube, And its top may be stuck in the outside of soil sample forming tube, the bottom of the spacing module is provided with a circle The horizontal plane of shape.

4. the utilization layer-compacting according to claim 1 or 3 prepares triaxial test examination The device of sample, it is characterised in that：The spacing module is 3 kinds, and it is highly different.

5. utilization layer-compacting according to claim 1 prepares triaxial test sample Device, it is characterised in that：The spacing module is solid by magnetic force with the hammer on soil sample compactor It is fixed.

6. prepare triaxial test using layer-compacting according to claim 1 or 5 to try The device of sample, it is characterised in that：Set between hammer in the spacing module and soil sample compactor There is the magnet with adsorptivity.

7. utilization layer-compacting according to claim 1 prepares triaxial test sample Device, it is characterised in that：The soil sample forming tube is to splice Jing circle cuffs by three arcs Fixed.

8. utilization layer-compacting according to claim 1 prepares triaxial test sample Device, it is characterised in that：The column is provided with two handle hanging holes for being located at differing heights.

9. utilization layer-compacting according to claim 1 prepares triaxial test sample Device, it is characterised in that：Groove on the base is annular；Groove on the base For circle.