Large shear apparatus for slip band soil residual strength regeneration test and application

Abstract

The invention provides a large shear apparatus for a slip band soil residual strength regeneration test and application. The large shear apparatus comprises a shear test system, a load system, a monitoring control system, a water inlet and drainage system and a container, the loading system is used for loading the shear test system; the loading system comprises a lifting mechanism, a lifting arm, a telescopic force arm horizontally sliding with the lifting arm, a force applying shaft and a pressurizing plate connected with the lower end of the force applying shaft. The lifting mechanism is used for ascending or descending the lifting arm in the vertical direction. The monitoring control system comprises a displacement monitor, a pressure sensor and a computer, the displacement monitor is used for monitoring the horizontal displacement of the telescopic force arm and the vertical displacement of the lifting arm, and the pressure sensor is arranged on the load acting surface of the load system on the shear test system. According to the invention, large-scale shearing design is adopted, so that the defect that a conventional direct shear apparatus cannot shear slippery soil to be residual at one time due to too small unidirectional shearing displacement is avoided.

Description

technical field [0001] The invention belongs to the technical field of landslide engineering tests, and in particular relates to a shear mechanics test instrument under the condition of a linear stress path and its application. Background technique [0002] After the landslide slides along the sliding surface for a long distance, the soil in the slide zone has been sheared to the residual stage, and the corresponding shear strength is reduced to the residual. Therefore, it is generally considered that the residual strength of sliding zone soil is an important parameter for evaluating landslide stability and anti-sliding design. [0003] Since the implementation of the Three Gorges Project, old landslides have often restarted due to the periodic storage and discharge of reservoirs. That is to say, after the landslide that has slipped in the geological history period stops sliding, it stops sliding after a long period of dormancy, and in the later period, it is stimulated by ...

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Problems solved by technology

But its disadvantages are: (1) the shearing distance of the conventional direct shear instrument is small, and the experiment needs to be carried out in the mode of reciprocating clipper, which is contrary to the sliding situation of the landslide in one direction; (2) when the ring shear instrument is used to carry out the test, The shearing is stopped by releasing the shearing force, but in fact, when the landslide is dormant, the shearing force on the sliding surface still exists

It is difficult for a ring shear instrument to simulate this real condition

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