Method for testing soil shear strength of slope in situ

Abstract

The invention discloses a method for testing the soil shear strength of a slope in situ, which comprises the following steps of: A1, on a slope with in-place soil, inserting a shear ring into the soil to be tested; A2, stripping soil in the direction of fall of the slope; A3, uniformly applying traction in the dip slope direction to the shear ring, and detecting an angular displacement; and A4, recording the change of the traction before and after the displacement, analyzing the maximum value of the traction in the dip slope direction, and acquiring the shear strength values of the slopes with different gradients and different depths in the dip slope direction through a unit conversion relation between force and the soil shear strength. The invention provides a method for testing the soil shear strength of a slope in situ by considering the dip slope shear direction and soil shear surface positions (different depths), which is used for determining a soil erosion resistant parameter in the field of soil and water conservation.

Description

technical field [0001] The invention relates to the field of water and soil conservation, in particular to a method for in situ measuring the shear strength 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. National 1.07×108km 2 3.330×107km of sloping cultivated land 2 , 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, a large amount of water, soil, and fertilizer are lost, resulting in a decline in fertility and...

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.