Vertical shearing surface annular shearing testing instrument capable of exerting confining pressure

Abstract

The invention discloses a vertical shearing surface annular shearing testing instrument capable of exerting confining pressure. The testing instrument comprises a frame, a frame support shearing box,a hydraulic servo loading system, a monitoring sensing system and a shearing power system, wherein the shearing box comprises an inner shearing box and an outer shearing box; the inner shearing box issteady without movement; the outer shearing box is capable of rotating annularly; the shearing power system is connected with the outer shearing box and is capable of driving the outer shearing box to rotate annularly; the hydraulic servo loading system comprises a normal pressurizing device and an annular force conduction plate; the normal pressurizing device is vertically inserted in the middleof the inner shearing box and is used for providing normal stress; the annular force conduction plate is mounted above the shearing box and is used for conducting vertical confining pressure; the monitoring sensing system is used for sensing shearing data of a soil sample in real time and used for transmitting the shearing data to a control device; the control device is used for qualitatively controlling the normal stress of the normal pressurizing device and the vertical confining pressure of the annular force conduction plate. The testing instrument has great significances in studying shearing resistance properties of long-runout landslide slip soil and revealing evolutionary process and mechanisms of landslide.

Description

technical field [0001] The invention relates to the technical field of geotechnical test equipment, in particular to a vertical shear plane ring shear tester capable of applying confining pressure. Background technique [0002] The study of the shear strength characteristics of soil is of great significance for the analysis of slope stability, the study of the mechanical mechanism of geological disasters and the study of the progressive failure process of slopes. [0003] The shear strength characteristics of rock and soil can generally be obtained by in-situ tests or indoor geotechnical tests. The shear test has the disadvantages of high cost, long period, and heavy equipment. Compared with this, although the representativeness of soil samples is poor, the indoor test is more widely used in the study of the shear strength characteristics of soil due to its low cost, short period, and low price. [0004] At present, the laboratory test methods commonly used in engineering ...

AI Technical Summary

Problems solved by technology

However, there are many problems in the currently disclosed vertical shear surface ring shear instrument. The device for applying axial stress and the device for applying torque are designed together, and they will interfere with each other in the actual work process, resulting in the force exerted on the soil sample. The accuracy of the force is reduced, which affects the accuracy of the test results; after the sample preparation is completed, the sample preparation guard needs to be removed and then inserted into the shear box, so the relatively loose soil and rock cannot be tested with the ring shear instrument; during the test It only provides vertical force loading perpendicular to the shear plane, and the stress distribution on the shear plane is not uniform, so it cannot provide accurate normal pressure and confining pressure

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