Soil stress-strain test mechanism

Abstract

The utility model provides a soil body stress strain test mechanism which comprises a test box, a plurality of deformation nets are vertically and uniformly arranged in the test box at intervals, a soil sample is filled between every two deformation nets, the top of the test box is provided with a consolidation load which can vertically act on the soil sample, and the consolidation load is connected with the test box. Deformation silk threads are horizontally connected to two opposite side walls of the plurality of deformation nets, and through holes suitable for the deformation silk threads to penetrate through are formed in opposite side walls of the test box; the test mechanism is simple and easily available in manufacturing material, low in cost, convenient to operate and easy to master, can visually display the distribution characteristics of the soil consolidation deformation value in the horizontal direction, and is convenient for scientific research and engineering application in the field of clay consolidation.

Description

Technical Field

[0001] The utility model belongs to the technical field of geotechnical engineering, and particularly relates to a soil stress and strain testing mechanism. Background Art

[0002] Consolidation testing is a crucial test in soil mechanics. It is essential for determining the stress-strain relationship in soil and forms the basis for establishing soil constitutive models. Existing testing devices include one-dimensional oedometers and triaxial oedometers. These devices are suitable for smaller specimens and assume uniform distribution of the consolidation pressure applied to the specimens. Consequently, few devices are suitable for consolidation testing under concentrated loads. In engineering practice, soil layers, such as piles, are subjected to concentrated loads. Deformation contours are an important parameter for describing the horizontal variation in the consolidation deformation of soil layers under load. Due to the influence of cohesion, the deformation continuity characteristic is more pronounced in clay, meaning that the horizontal variation in the consolidation deformation of clay layers warrants greater engineering attention. Determining the horizontal distribution of deformation in clay layers under concentrated loads can provide valuable insights for studying soil deformation and improving pile foundation construction techniques. However, currently, few laboratory devices are available that can measure the consolidation deformation contours of clay.

[0003] Therefore, the soil stress-strain testing device of the present invention is designed to describe the horizontal distribution characteristics and variation patterns of soil consolidation deformation and to draw deformation contour lines. This device is of great value to soil deformation research and pile foundation design improvements. Utility Model Content

[0004] The purpose of this utility model is to provide a soil stress-strain testing mechanism to solve the problems raised in the above background technology. The specific solution is as follows:

[0005] A soil stress and strain testing mechanism, the testing mechanism includes a test box, a plurality of deformation nets are evenly spaced vertically upward inside the test box, and each pair of deformation nets is filled with soil samples. A consolidation load that can act vertically on the soil sample is provided on the top of the test box, and deformation wires are horizontally connected to the opposite side walls of the plurality of deformation nets, and through holes suitable for the deformation wires to pass through are opened on the opposite side walls of the test box.

[0006] Furthermore, the test box is a cylindrical structure.

[0007] Furthermore, the deformable mesh is made of flexible four wires.

[0008] Furthermore, a scale is vertically provided on the side wall of the test box.

[0009] Furthermore, the thickness of each layer of the soil sample is 5 cm.

[0010] Furthermore, the mesh openings of the deformable net are smaller than the diameter of the soil particles of the soil sample.

[0011] The beneficial effects of the utility model are:

[0012] The utility model provides a soil stress-strain testing mechanism, which is made of simple and easily available materials, has low cost, is easy to operate and is easy to master. It can intuitively display the horizontal distribution characteristics of soil consolidation deformation values, is convenient for scientific research and engineering application in the field of clay consolidation, and is of great value to soil deformation research and pile foundation design improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the main view of the utility model.

[0014] Figure 2 It is a top view of the utility model.

[0015] Explanation of reference numerals: 1-concentrated load; 2-test box; 3-deformed wire; 4-deformed mesh; 5-through hole; 6-soil sample. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] See Figure 1-2 A soil stress and strain testing mechanism includes a test box 2, which is a cylindrical structure. A plurality of deformation nets 4 are evenly spaced vertically upward inside the test box 2, and soil samples 6 are filled between each two deformation nets 4. A consolidation load 1 that can act vertically on the soil sample is provided on the top of the test box 2. Deformation wires 3 are horizontally connected to the opposite side walls of the plurality of deformation nets 4, and through holes 5 suitable for the deformation wires 3 to pass through are opened on the opposite side walls of the test box 2.

[0018] The deformation net 4 is made of four flexible wires, so that the deformation net 4 can be deformed freely along with the soil layer, thereby improving the accuracy of the test.

[0019] Preferably, a scale is vertically provided on the side wall of the test box 2 .

[0020] Preferably, the thickness of each layer of soil sample 6 is 5 cm.

[0021] The mesh openings of the deformable net 4 are smaller than the diameter of the soil particles of the soil sample 6 , wherein the mesh openings of the deformable net 4 are smaller than 60% of the diameters of the soil particles.

[0022] Working principle: First, lay and compact the clay sample 6 on the top surface of the test box 2, and place the deformation mesh 4 directly on it. The deformation wire 3 on the side of the deformation mesh 4 is placed in the through hole 5. Then, under the action of the vertical concentrated load, the soil sample 6 layers undergo vertical deformation, and the deformation mesh 4 also deforms along with the soil sample 6 layers; after the consolidation test is completed, the clay sample is taken out and cut longitudinally. The horizontal distribution characteristics of the soil layer consolidation deformation value can be observed based on the shape of the deformation mesh on the cross-section. Combined with the position change of the deformation wire, the deformation of the deformation mesh can be quantitatively described, and the clay sample deformation contour line can be drawn.

[0023] The specific test steps are as follows:

[0024] Step 1: The soil sample 6 is filled in layers and compacted by static pressure, wherein each layer of soil sample is 5 cm thick. During implementation, the soil sample 6 is first filled from the bottom of the test box 2 and flattened, and a deformable mesh 4 is laid flat on the upper surface of the soil layer, and then static pressure compaction is performed. Finally, the deformable wire on the deformable mesh 4 is passed through the through hole 5.

[0025] Step 2: Repeat the above operation, fill the second layer of soil sample 6 and place the deformation net 4 and deformation wire 3 in turn, and repeat this process. According to the total thickness of the soil sample 6 designed for the test, determine the number of soil layers to be filled and the number of deformation nets 4 to be installed.

[0026] Step 3: After the top layer of soil of soil sample 6 is filled, a vertical consolidation load 1 can be applied to the center of the sample, and the consolidation load 1 should be maintained for a certain duration according to the requirements of the consolidation test.

[0027] Step 4: After the consolidation test is completed, measure the longitudinal displacement value of each deformation wire 3 and record it; take out the soil sample 6 from the test box 2, cut the soil sample 6 along the diameter direction, observe the relative position change of the deformation network 4 on the cross section, and then calculate the longitudinal absolute deformation value of each point on the deformation network 4 based on the longitudinal displacement value of the deformation wire 3. Then, connect the points with equal absolute values ​​of longitudinal deformation into a line to obtain the consolidation deformation contour line of the soil sample.

[0028] The test device is made of simple and readily available materials, is low-cost, and is easy to operate and master. It can intuitively display the horizontal distribution characteristics of soil consolidation deformation values, facilitating scientific research and engineering applications in the field of clay consolidation.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0030] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A soil stress-strain testing mechanism, characterized by: The test mechanism comprises a test box (2), wherein a plurality of deformation nets (4) are evenly spaced vertically upward inside the test box (2), and soil samples (6) are filled between each of the deformation nets (4). A consolidation load (1) capable of acting vertically on the soil sample is provided on the top of the test box (2), and deformation wires (3) are horizontally connected to opposite side walls of the plurality of deformation nets (4), and through holes (5) suitable for the deformation wires (3) to pass through are provided on the opposite side walls of the test box (2).

2. A soil stress-strain testing mechanism according to claim 1, characterized in that: The test box (2) is a cylindrical structure.

3. A soil stress-strain testing mechanism according to claim 1, characterized in that: The deformation net (4) is made of four flexible wires.

4. A soil stress-strain testing mechanism according to claim 1, characterized in that: The side wall of the test box (2) is vertically provided with scales.

5. The soil stress-strain testing mechanism according to claim 1, characterized in that: The thickness of each layer of the soil sample (6) is 5 cm.

6. The soil stress-strain testing mechanism according to claim 1, characterized in that: The mesh of the deformable net (4) is smaller than the diameter of the soil particles of the soil sample (6).

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