CN216208255U - Triangular shearing plate head - Google Patents
Triangular shearing plate head Download PDFInfo
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- CN216208255U CN216208255U CN202122692922.1U CN202122692922U CN216208255U CN 216208255 U CN216208255 U CN 216208255U CN 202122692922 U CN202122692922 U CN 202122692922U CN 216208255 U CN216208255 U CN 216208255U
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Abstract
The utility model discloses a triangular shearing plate head, which comprises a shaft lever and a shearing plate head, wherein the shaft lever comprises a rotating rod and a sleeve sleeved outside the rotating rod, and the rotating rod is in rotatable rolling friction contact with the sleeve; the shearing head consists of a plurality of blades which are right-angled triangles and have the same size; the side wall surface of each blade of the shearing plate head is abutted and fixed on the outer wall surface of the lower part of the rotating rod, and the lower end surface of the sleeve is flush with the upper end surface of the shearing plate head. The utility model has the advantages that: the right-angled triangular blade is used as a shear plate, and the measured shear strength value takes into account the shear strength of the horizontal direction of the right-angled short side of the blade and the shear strength of the inclination angle direction of the inclined side, so that a single test value is reasonable and representative when describing the shear strength on the sliding surface of the side slope; different from the traditional cross-shaped shearing plate, the triangular three-blade shearing plate head can effectively reduce the cross-sectional area ratio of the plate head, and has obvious effect of controlling the disturbance degree of the plate head in the penetration process to the soil body; the sleeve isolates the surrounding soil body, and the rotating rod cannot rub the soil body when rotating, so that the torque is not lost.
Description
Technical Field
The utility model relates to the technical field of in-situ testing, in particular to a triangular shear plate head.
Background
The shear strength of the soil body can be obtained by indoor or in-situ test tests respectively. Tests for measuring the shear strength of a soil body indoors such as direct shearing, triaxial compression and the like require that an original soil sample is obtained in advance, but because the soil sample is subjected to inevitable disturbance in the processes of collection, transportation, storage and preparation, the water content of the soil is difficult to keep in an original natural state, particularly for cohesive soil with high sensitivity, the reaction of indoor test results to the actual condition of the soil is influenced by different degrees.
The cross plate shear test is the most common soil shear strength measuring method in the in-situ test, has the advantages of simple equipment and convenient operation, and not only influences the test result by the rotation rate of the cross plate and the interval time after the plate head is inserted, but also influences the test result by the disturbance of the cross plate head to the soil body in the process of being pressed into the test depth by a penetration machine.
The size of the disturbance, i.e. the cross-sectional area of the shear plate head/the cross-sectional area of the sheared soil cylinder, can be quantified and measured by the shear plate area ratio. In the prior art, the effect of the disturbance degree of the soil body in the plate head penetration process is not controlled by reducing the cross-sectional area ratio of the plate head, so that the test result is more accurate.
Disclosure of Invention
The utility model aims to provide a triangular shearing plate head according to the defects of the prior art, and the triangular shearing plate head can effectively reduce the cross-sectional area ratio of the plate head by adopting a right-angled triangular three-blade shearing plate, has obvious effect of controlling the disturbance degree of the plate head in the penetration process of the plate head and ensures that the test result is more accurate; meanwhile, the test value Cu is the mean value of the shear strength on the shear failure surface of the plate head in the horizontal and bevel edge inclination angle directions, so that the method has more advantages in measuring the shear strength of the sliding surface of the side slope.
The purpose of the utility model is realized by the following technical scheme:
a triangular shear plate head comprises a shaft lever and a shear plate head, and is characterized in that the shaft lever comprises a rotating lever and a sleeve sleeved outside the rotating lever, the rotating lever is in rotatable rolling friction contact with the sleeve, and the length of the rotating lever is greater than that of the sleeve; the shearing plate head consists of a plurality of blades which are right-angled triangles and have the same size; the side wall surface of each blade of the shearing plate head is abutted and fixed on the outer wall surface of the lower part of the rotating rod, and the lower end surface of the sleeve is flush with the upper end surface of the shearing plate head.
The shearing head consists of three blades, and the included angle between every two adjacent blades is 120 degrees.
The blades comprise right-angle short sides, right-angle long sides and oblique sides, the right-angle long sides of the blades are abutted to the outer wall surface of the rotating rod and fixedly connected with the outer wall surface of the rotating rod, the right angles of the right-angle long sides of the blades are located at the upper part, and the acute angles of the right-angle long sides of the blades are located at the lower part.
The right-angle short sides of the blades are positioned on the same horizontal plane, and the bevel edges of the blades are positioned on the same conical curved surface.
The utility model has the advantages that:
1. the right-angled triangular blade is used as the shear plate, and the measured shear strength value takes into account the shear strength of the blade in the horizontal direction and the bevel edge dip angle direction of the right-angled short side, so that the single test value is reasonable and representative when describing the shear strength on the sliding surface of the side slope.
2. Different from the traditional cross-shaped shear plate, the triangular three-blade shear plate can effectively reduce the cross-sectional area ratio of the plate head, and the effect of controlling the penetration process of the plate head on the disturbance degree of a soil body is obvious, so that the test result is more accurate.
3. The periphery of the rotating rod is provided with a sleeve, and because the sleeve isolates surrounding soil, the rotating rod can not rub against the soil to cause torque loss when rotating.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a schematic view of a shear plate blade of the present invention.
Fig. 3 is a schematic elevation of a shear plate of the present invention.
Fig. 4 is a schematic view of measuring shear strength on a slope sliding surface according to the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-4, the labels in the figures are: shaft lever 1, shear head 2, sliding surface 3, rotating rod 11, sleeve 12, right-angled short side 21, right-angled long side 22 and bevel edge 23.
Example (b): as shown in fig. 1-4, the present embodiment relates to a triangular shear plate head, which comprises a shaft rod 1 and a shear plate head 2, wherein the shaft rod 1 comprises a rotating rod 11 and a sleeve 12, the rotating rod 11 is inserted into the sleeve 12 and has a length greater than that of the sleeve 12, the rotating rod 11 is in rotatable rolling friction contact with the sleeve 12, and a lubricant such as grease can be added if necessary. The bottom of the sleeve 12 is flush with the top of the shear plate head 2, the rotating rod 11 is abutted against the side face of each blade of the shear plate head 2, and the rotating rod 11 is in contact friction with the surrounding soil body, so that the torque generated by the soil body on the shear plate due to shearing in the test process is close to the torque applied by external force.
As shown in fig. 2, the vanes comprise a short rectangular side 21, a long rectangular side 22 and a hypotenuse side 23, the vanes being connected to each other by the long rectangular side 22. Wherein, the long 22 butt of right angle limit of blade is on the outer wall of the lower part of axostylus axostyle 1, and axostylus axostyle 1 and the long 22 on the right angle limit are located same straight line, and right angle minor face 21 is located the coplanar, and shear plate hypotenuse 23 is located same circular cone curved surface. The right angle of the right-angled long side 22 of the blade is located at the upper part and the acute angle is located at the lower part.
As shown in fig. 1-4, when the triangular shear plate is used for soil shear strength test, the cross-sectional area of the shear plate head is relatively small, and the bottom of the shear plate head is in an acute angle, so that the soil is less disturbed in the process that the shear plate penetrates into the soil; the shearing failure surface of the soil body is in an inverted cone shape, the shear strength test value of the conical failure surface can be obtained through the conversion of the torque and the size of the shearing plate head 2, and the test value is representative to the horizontal shear strength on the conical failure plane and the inclined plane shear strength on the failure curved surface, so that the method has good practicability in practical engineering. The right-angled triangular blade is used as the shear plate, and the measured shear strength value takes into account the shear strength of the blade in the horizontal direction and the bevel edge dip angle direction of the right-angled short side, so that the single test value is reasonable and representative when describing the shear strength on the side slope sliding surface 3. The specific test steps are as follows:
1. and (3) penetrating the shear plate into a test soil body along with the shaft lever 1, standing for 2-3min until the water pressure of the soil body over-pores is dissipated, and then applying a certain torque to the rotating rod 11 to perform an in-situ shear test. The sleeve plays isolated effect at axostylus axostyle penetration and rotation in-process, avoids the part that the bull stick submerges the soil body and soil body contact and then the moment of torsion that the loss part axostylus axostyle transmitted, influences the measuring accuracy.
2. Non-drainage shear strength value of soil bodyCuThe following formula is obtained:
in the formula, M is the resisting torque of the surrounding soil body to the shear plate, D is the width of the shear plate head, and H is the height of the shear plate.
The derivation of the above equation is as follows:
the shearing surface is divided into a conical curved surface and a conical bottom surface: area of conical curved surface:
area of the bottom surface of the cone:
；
on the bevel edge 23 of the triangular shear plate, the soil shear strength tau of the bevel edge1Is distributed in a triangle, the action point of which is far from the action distance of the shaft lever
As shown in fig. 3. In the formula (I), the compound is shown in the specification,
meaning the distance from the outermost side of the hypotenuse of the shear plate to the shaft;
the resistance torque of the soil mass to the hypotenuse of the shear plate can therefore be expressed as:
；
similarly, on the right-angled short side 21 of the triangular shear plate, shearing is carried outShear strength τ to break horizontal plane2Also distributed in a triangle with the action distance of force as
. The resistance torque of the soil body to the right-angle short side of the shear plate is as follows;
。
thus, the resisting moment of the surrounding soil body to the shear plateMCan be expressed as:M=M 1 +M 2 . For simplicity of calculation, in the formula1、τ2All the materials are taken out of the pot,
about in the above formulaM 1 AndM 2 substituting and simplifying the expression of (a):
the shear strength of the soil body to be tested can be obtained according to the formula as follows:
。
Claims (4)
1. a triangular shear plate head comprises a shaft lever and a shear plate head, and is characterized in that the shaft lever comprises a rotating lever and a sleeve sleeved outside the rotating lever, the rotating lever is in rotatable rolling friction contact with the sleeve, and the length of the rotating lever is greater than that of the sleeve; the shearing plate head consists of a plurality of blades which are right-angled triangles and have the same size; the side wall surface of each blade of the shearing plate head is abutted and fixed on the outer wall surface of the lower part of the rotating rod, and the lower end surface of the sleeve is flush with the upper end surface of the shearing plate head.
2. A triangular shear head as claimed in claim 1, wherein the shear head comprises three blades, and the angle between adjacent blades is 120 °.
3. The triangular shear head of claim 1, wherein the blades include a short right-angled side, a long right-angled side, and a hypotenuse, the long right-angled side of each blade abutting against and being fixedly attached to the outer wall surface of the rotating bar, the long right-angled side of each blade being at an upper portion and at an acute angle at a lower portion.
4. A triangular shear head as claimed in claim 3, in which the shorter right-angled sides of the blades lie in the same horizontal plane and the hypotenuse of the blades lie in the same conical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122692922.1U CN216208255U (en) | 2021-11-05 | 2021-11-05 | Triangular shearing plate head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122692922.1U CN216208255U (en) | 2021-11-05 | 2021-11-05 | Triangular shearing plate head |
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| Publication Number | Publication Date |
|---|---|
| CN216208255U true CN216208255U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122692922.1U Active CN216208255U (en) | 2021-11-05 | 2021-11-05 | Triangular shearing plate head |
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| Country | Link |
|---|---|
| CN (1) | CN216208255U (en) |
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2021
- 2021-11-05 CN CN202122692922.1U patent/CN216208255U/en active Active
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