Soil in-situ shear resistance tester

Abstract

The invention discloses a soil in-situ shear resistance tester, which is characterized in that: the soil in-situ shear resistance tester comprises a supporting device, a shearing device, a sensing device, a driving device and a data acquisition and analysis device, wherein the supporting device is used for fixing the driving device; the shearing device is used for directly acting on the soil to make the soil stressed uniformly; one end of the sensing device is connected with the shearing device, while the other end is connected with the driving device; the sensing device is used for outputting electric signals proportional to traction; the driving device drives the shearing device to perform destructive tests at a linear speed required by shear tests; and the data acquisition and analysis device is used for recording the maximum value of the traction in the horizontal direction according to the electric signals, and the soil shear resistance is calculated according to the shear area of the shearing device.

Description

technical field [0001] The invention relates to the technical fields of water and soil conservation and geotechnical engineering, in particular to an in-situ measuring instrument for measuring the shear resistance of surface soil. Background technique [0002] my country is one of the countries with the most serious water and soil erosion in the world. The soil erosion area accounts for 1 / 3 of the total land area, and it is characterized by high intensity, complex causes, and serious damage, especially the loess in the northwest, the red soil in the south, and the black soil in the northeast. Soil erosion is the most intense. Among the 1.07×108km2 cultivated land in the whole country, there is 3.330×107km2 slope cultivated land, accounting for 1 / 3 of the total cultivated land area. Sloping cultivated land is the source of water and soil erosion. Not only does a large amount of sediment pour down, endangering the safety of flood control in the downstream, but more seriously, ...

AI Technical Summary

Problems solved by technology

Direct shear test, triaxial shear test, repeated direct shear strength test and unconfined compressive strength test methods are the methods of geotechnical experiment determination, which are often aimed at relatively solid soil, and all of them need to be sampled in the field. One is that the shear sample changes the environmental state of the tested soil, and the other is that the surface soil is too loose to obtain a shear sample, so it is impossible to measure it.

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