Comparative analysis of stability of embankment on the basis of torsional ring shear test

Abstract

Designing slopes and embankments is an important geotechnical stage in the framework of industrial, civil and transport construction. For analytical and numerical stability calculations for the first limiting state, soil strength parameters are required, obtained, as a rule, based on the results of field and laboratory studies. Currently, a significant number of methods and equipment for soil testing for shear have been developed. In this paper we focus on the method of testing of cohesive soils under torsional shear ring. It is believed that this type of shear tests most accurately repeats the mechanical process observed during the destruction of slopes and embankments with the formation of fixed cut surfaces and taking into account large shear deformations. This paper contains information on the design of an experimental instrument for a ring (cylindrical) shear of cohesive soil samples. The processing of the results of torsional shear with different speeds is presented, the parameters and methods for finding them. The main purpose of the tests - determination of residual strength parameters: the angle of internal friction and cohesion. Examples are given of using the parameters obtained during tests of a torsional shear for numerical simulation of embankment from cohesive soil.