Large-scale direct shear apparatus between geo-technic synthetic materials and between geo-technic synthetic materials and earth

Abstract

The invention discloses a large-scale direct shear apparatus between geo-technic synthetic materials and between the geo-technic synthetic materials and the earth, which comprises a lower shearing box, an upper shearing box and a pressure plate, wherein a central line of the upper shearing box is aligned with a central line of the lower sharing box; and the periphery of the pressure plate is matched with the inside of the upper shearing plate; an II-shaped plate frame is placed in the lower shearing box; and stainless steel gaskets with different thicknesses and different numbers are placed under the II-shaped plate frame according to different heights of testing materials; and two internal baffle plates can be placed in the upper shearing box or an upper shearing plate is placed in the upper shearing box according to the types of the testing materials. The modified shearing boxes disclosed by the invention solve the problem that a direct shearing test on the geo-technic synthetic materials and particle materials or between the geo-technic synthetic materials can not be carried out at the same time in the prior art. Because of reasonable structure and simple and convenient operation, the direct shear apparatus can be applied to rigid direct shearing test and a flexible direct shearing test between the geo-technic synthetic materials and the particle materials, and between the geo-technic synthetic materials, can ensure that the effective shearing area is invariable, the testing materials are uniformly stressed, and the shearing boxes are tightly adhered to test samples in the test process, improves the accuracy of the test achievements and greatly improves the utilization ratio of the test device.

Description

technical field [0001] The invention relates to a large-scale direct shear instrument between geosynthetics and geosynthetics-soil, which is suitable for direct shear tests of rigidity and flexibility between geosynthetics and soil, and between geosynthetics. Background technique [0002] At present, the shear characteristics of the interface are generally studied through indoor direct shear tests, but there are some shortcomings in the large-scale direct shear instruments developed at present, such as only suitable for interface shear tests between geosynthetic materials, but not for geotechnical The shear test between synthetic materials and fine-grained materials; or the upper and lower shear boxes are equal in size, and during the shearing process, the sheared surface changes, and certain revisions must be made during the calculation process, resulting in the validity of the test data Poor; or during the shearing process, due to the large normal stress, it often occurs t...

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Problems solved by technology

[0003] The purpose of the present invention is: to solve the current direct shear instrument shear box or can not guarantee that the shear area is constant in the shearing process, or can not carry out the direct shear test between the geosynthetic material and the soil and the geosynthetic material at the same time. To solve the problem of direct shear test between geosynthetics and geosynthetics-soil, the invention provides a large-scale direct shear instrument, which can not only carry out direct shear test between geosynthetics and soil, but also perform geosynthetics A large-scale direct shear instrument for direct shear tests of rigidity and flexibility between synthetic materials. At the same time, this instrument can also ensure that the shear area is constant during the shear process, and the shear surface can be adjusted according to the height of the test material.

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