Test device and test method of residual strength of soil sample

Abstract

The invention relates to a test device and a test method of the residual strength of a soil sample. The test device comprises a bottom plate, an annular side plate, a rotary top plate, a humidity sensor, a soil sample embedded device, a stress sensor, a data acquisition computer, a top plate rotation driving device and a water injection device, wherein the bottom plate and the rotary top plate are respectively arranged at the bottom and the top of the annular side plate and define a cavity for storing a to-be-tested cylindrical soil sample together with the rotary top plate; the water injection device is communicated with the cavity; the humidity sensor is arranged in the cavity; the soil sample embedded device is arranged on the lower surface of the rotary top plate and is embedded into the upper surface of the to-be-tested cylindrical soil sample; the top plate rotation driving device is arranged on the upper surface of the rotary top plate and is used for driving the rotary top plate to rotate; the stress sensor is arranged on the soil sample embedded device; the humidity sensor and the stress sensor are respectively connected with the data acquisition computer. The invention provides the device and the method which can be used for efficiently and fast testing the residual strength of cylindrical soil samples with different sizes and different water contents.

Description

technical field [0001] The invention belongs to the technical field of geotechnical laboratory tests, and relates to a soil sample residual strength test device and a test method. Background technique [0002] Residual strength is the ability of soil to maintain residual deformation and resist external loads after failure. It is the basic index for evaluating slope stability and the key content of landslide stability evaluation and prediction. Theory and examples show that the sliding zone soil is an important part of the landslide. The complexity of the geological action and the particularity of the stress state in the formation process of the sliding zone soil make the structural characteristics and physical and mechanical properties of the sliding zone soil different from those in other landslides. There are large differences in the soil mass of the site, showing significant discreteness and variability. How to accurately test the residual strength of the soil in the mult...

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Problems solved by technology

[0003] The existing residual strength testing device is mainly a direct shear instrument, which cannot realize rotational shearing, and the shear area of ​​the soil sample is small, which cannot truly reflect the residual strength of the soil; its testing method is also relatively backward, and the efficiency is low, which affects Its use in geotechnical testing

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