Circular loading shear apparatus for observing earth and structural member contact face mechanical property

Abstract

A cyclic loading shear tester for observing the mechanical characteristics of interface between earth and structural member is composed of the earth container carriage with organic glass window, normal boundary control unit put on structural plate on the earth, data acquisition system, and hydraulic loading and control system. Its advnatages are high test and measuring precision, and use of digital photography.

Description

technical field [0001] The invention belongs to mechanical property testing equipment, in particular to a cyclic loading shearing instrument for observing the mechanical properties of the contact surface of soil and structure, which is used for reproducing and observing the static dynamic response of the contact surface of soil and structure. Background technique [0002] The main instruments for the static and dynamic characteristics of the contact surface between soil and structure are direct shear instrument, simple shear instrument, torsional shear instrument, dynamic triaxial instrument and resonance column instrument. Among them, the direct shear and simple shear contact surface test instruments are improved on the basis of the direct shear instrument and the simple shear instrument for studying the mechanical properties of soil, and are widely used in the test and research of the mechanical properties of the contact surface. [0003] In recent years, a batch of equipm...

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Problems solved by technology

However, most of the existing test equipment is improved on the basis of soil static and dynamic characteristics test equipment (such as direct shear instrument, simple shear instrument, etc.), without fully considering the characteristics of the contact surface itself

For example, the normal stress is generally applied on the soil rather than directly on the contact surface itself, which causes difficulties in controlling the normal boundary conditions of the contact surface and errors in measuring the normal stress; for example, most of the existing contact surface tests It is limited to observe its shear characteristics, but ignores the non-negligible normal deformation of the contact surface and the coupling characteristics of the normal stress-strain relationship and the tangential stress-strain relationship. Therefore, it is required to reproduce the contact surface under a more complex stress path. In addition, the size of the existing contact surface test equipment is generally small, which is only suitable for fine-grained soil such as sandy soil, and it is difficult to simulate the monotonic or cyclic loading of the contact surface of coarse-grained soil with larger particle size and structural parts. The actual mechanical behavior under the conditions; although the mesoscopic and microscopic measurement technology of the contact surface has been initially applied, it has not yet reached maturity, especially in large equipment, it has not been widely used and well integrated

These defects obviously limit the research on the static and dynamic characteristics of the interface between soil and structure, especially the interface between coarse-grained soil and structure.

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