Portable weak-layer in-situ direct-shear tester and testing method thereof

A direct shear tester, portable technology, applied in the field of portable weak layer in-situ direct shear tester and its testing field, can solve the problems of in-situ direct shearer, such as large mass, inconvenient transportation and carrying, and non-disassembly of the whole, to achieve Easy to operate, simple structure and accurate results

Inactive Publication Date: 2015-07-29
INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI +1
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Problems solved by technology

[0009] The object of the present invention is to provide a portable in-situ direct shear tester for weak layer belts and its testing method, to solve the problem that the in-situ direct sh

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  • Portable weak-layer in-situ direct-shear tester and testing method thereof
  • Portable weak-layer in-situ direct-shear tester and testing method thereof
  • Portable weak-layer in-situ direct-shear tester and testing method thereof

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Embodiment Construction

[0027] The basic principle of the present invention is proposed based on the Coulomb principle of classical rock and soil mechanics, according to the Coulomb strength criterion Among them, τ f is the shear strength of rock and soil (kPa), σ is the normal pressure acting on the shear plane (kPa), refers to the internal friction angle of the rock and soil mass (°), c refers to the cohesion of the rock and soil mass (kPa), and is determined by the shear strength τ f is the ordinate, the vertical pressure σ is the abscissa, and the shear strength τ is plotted f According to the relationship curve of the vertical pressure σ, draw a visually measured straight line according to each point on the graph, and the inclination angle of the straight line is the internal friction angle of the soil The intercept of the straight line on the ordinate axis is the cohesion c of the soil. In the present invention, a certain load is applied in the vertical direction, and a horizontal force i...

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Abstract

The invention provides a portable weak-layer in-situ direct-shear tester and a testing method thereof. The portable weak-layer in-situ direct-shear tester comprises a counter-force steel frame, a shear box, a horizontal loading system and a vertical loading system, wherein a test space is formed in the counter-force steel frame; the shear box is mounted in the test space; one end of the horizontal loading system acts on the counter-force steel frame, and the other end of the horizontal loading system acts on the vertical lateral wall of the shear box; the vertical loading system comprises a row of balls, one end of the vertical loading system acts on the top cover of the counter-force steel frame, and the other end of the vertical loading system acts on the upper surface of the shear box through the balls. Through the adoption of the portable weak-layer in-situ direct-shear tester disclosed by the invention, the shear parameters of unperturbed weak layers in situ can be quickly obtained on site, so that the tested result is more accurate and reliable, and the tester is convenient to test the shear strength parameters of weak layers in situ; in addition, the portable weak-layer in-situ direct-shear tester disclosed by the invention also has the characteristics of being simple in structure, easy to operate and portable.

Description

technical field [0001] The invention belongs to the field of testing mechanical parameters of rock and soil, and in particular relates to a portable in-situ direct shear tester for weak layers and a testing method thereof. Background technique [0002] Weak layer zone is a banded distribution of rock formations whose physical and mechanical properties are weaker than those of surrounding rocks, including weak interlayers, fault fracture zones, and intralayer dislocation zones. In the construction of large-scale hydropower, railway, and highway projects, engineering geological disasters such as slope instability and tunnel collapse caused by weak layers are often encountered. one of the important factors. Therefore, the weak zone is the focus of all kinds of large-scale geological engineering research, and the strength parameters of the weak zone are the key mechanical parameters to control the anti-sliding stability of rock and soil and superstructures. [0003] At present...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 张勇魏玉峰程英建
Owner INST OF EXPLORATION TECH OF CHINESE ACAD OF GEOLOGICAL SCI
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