Soil in-situ ring shear tester
An experimental instrument and in-situ technology, applied in the direction of applying stable shear force to test the strength of materials, etc., can solve the problems of high cost, few ring shear instruments, complex mechanism, etc., and achieve reliable results, accurate testing, and flexible operation Effect
Inactive Publication Date: 2015-09-16
INST OF MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
Due to the complex structure and high cost of modern ring shearing instruments, there are still few domestic ring shearing instruments
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[0015] For geological disasters such as landslides and debris flows caused by strong earthquakes and concentrated rainfall, it is of great significance to carry out in-situ ring shear experiments under actual stress states and physical conditions: 1. It can quantitatively simulate and analyze the development, development, occurrence, and failure of geological disasters 2. It can quantitatively analyze the formation of sliding shear zone, the change of soil stress state, the change of pore water pressure, etc.; 3. The occurrence and movement mechanism of landslides and other geological disasters can be revealed from the mechanical state of the soil. The residual shear strength of the slide zone was obtained from the soil ring shear experiment on site, and the softening law of the mud in the landslide zone was analyzed, especially for rainfall, reservoir water level rise, and earthquakes with fast moving speed and long sliding distance. Disastrous landslides; 4. Using the on-site...
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The invention discloses an in-situ ring shearing test apparatus for soil. The in-situ ring shearing test apparatus comprises a steel frame, a vertical oil cylinder disposed on the steel frame, a rotary hydraulic cylinder disposed on the power output end of the vertical oil cylinder and a cylinder disposed on the power output end of the rotary hydraulic cylinder, wherein the cylinder is provided with steel blades extending along a cylinder axis direction; the cylinder is also provided with an angular displacement sensor for measuring displacement and a first pressure sensor for measuring a push force; and the vertical oil cylinder is provided with a second pressure sensor for measuring side pressure. The cylinder provided with the steel blades is pressed into the soil by downing the vertical oil cylinder, the vertical oil cylinder contacting the soil surface; the whole soil is turned around uniformly by rotating the rotary hydraulic cylinder until the soil is broken by shearing, so that attenuation processes of strengths such as peak shear strength, fully softened shear strength, residual shear strength and the like of the soil during a whole loading process can be obtained. The test apparatus is accurate in test, flexible in operations and reliable in results.
Description
technical field [0001] The invention relates to the technical field of soil in-situ testing, in particular to an in-situ ring shear experiment instrument for soil. Background technique [0002] The indoor ring shear tester was used to test the residual shear strength of the reshaped ring soil samples. The main advantage of this method over direct shear testing is that the area of continuous shear remains constant throughout the test. This method allows us to accurately reproduce the residual shear stress state in situ in the laboratory. [0003] As a geotechnical experimental equipment mainly used to study the mechanical properties of soil under the condition of large shear displacement, the ring shear instrument has its unique design structure and experimental functions. Scholars from various countries have successively developed ring shear experimental equipment with various functions according to their respective research purposes and contents. The field of scientifi...
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IPC IPC(8): G01N3/24
Inventor 刘晓宇孟达葛勇勇李世海易瑞祥吕祥峰赵颖
Owner INST OF MECHANICS CHINESE ACAD OF SCI