Direct shear test device

Abstract

The invention belongs to the technical field of civil engineering geotechnical material experiments, and particularly relates to a direct shear test device which meets test preparation requirements ofshear samples with various structural sizes and improves test efficiency of the shear samples. The device comprises a device test bed. A shear box is arranged on the device test bed, a central test hole is arranged in the shear box, a test sleeve is connected in the central test hole in a sleeved mode, and a shear box upper cover is further arranged on the shear box; and a counter-force frame body is arranged outside the shearing box, a hydraulic jack is arranged on the counter-force frame body, a test shearing device is arranged on one side of the shearing box on the device test bed and usedfor applying a horizontal shearing force to the sample in the shearing box step by step, and a shearing stress sensing device is further arranged on the other side of the shearing box on the device test bed. According to the direct shear test device provided by the invention, test data measurement precision of the shear sample is greatly improved, and an automatic test data acquisition function is realized.

Description

technical field [0001] The invention belongs to the technical field of civil engineering geotechnical material testing; in particular, it relates to a direct shear testing device. Background technique [0002] With the continuous development and progress of China's building foundation treatment technology, various new processes and new materials are constantly being developed and applied. These reinforcement materials usually play a role in strengthening the foundation soil structure in the soil, such as: geomembrane, geotechnical Grids, cement-soil mixing piles, reinforced concrete piles, steel sheet piles, polymer cut-off walls, etc., can greatly improve the bearing capacity of the foundation when the reinforcement materials and soil work together, and have been widely used in foundation reinforcement projects in recent years; However, under the action of the upper part of the foundation, a shear force will be generated at the contact surface between the reinforcement mate...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development and progress of China's building foundation treatment technology, various new processes and new materials are constantly being developed and applied. These reinforcement materials usually play a role in strengthening the foundation soil structure in the soil, such as: geomembrane, geotechnical Grids, cement-soil mixing piles, reinforced concrete piles, steel sheet piles, polymer cut-off walls, etc., can greatly improve the bearing capacity of the foundation when the reinforcement materials and soil work together, and have been widely used in foundation reinforcement projects in recent years; However, under the action of the upper part of the foundation, a shear force will be generated at the contact surface between the reinforcement material and the soil, that is, the interface shear force; and the magnitude of the interface shear force is also an indicator for evaluating the interface shear strength and estimating the bearing capacity of the foundation. For important parameters, the traditional measurement method is mostly to use the existing geotechnical direct shear instrument for test measurement; however, most of the geotechnical direct shear instrument devices with traditional structural design have difficulties in making samples, and most of the test data are read manually , there is a large error in the test measurement process, and with the deepening of the research on the size effect, the demand for multi-size direct shear test devices is also increasing; therefore, it is very important to provide a new direct shear test device the necessity of

Images