Large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests

Abstract

The invention discloses a large bidirectional dynamic / static direct-shearing machine for coarse-grained soil contact interface tests. The machine comprises a measuring and controlling unit (1), a hydraulic servo unit (2), a loading unit (3) and a soil sample preparing unit (4). The loading unit (3) comprises a Z-direction vertical loading frame, an X-direction horizontal loading frame and a Y-direction horizontal loading frame, the three frames are perpendicular to each other, and the three frames all have independent loading ability. The hydraulic servo unit (2) comprises an X-direction horizontal loading actuator (311), a Y-direction horizontal loading actuator (312) and a Z-direction vertical loading actuator (31). The measuring and controlling unit (1) is in separate communication connections with three electro-hydraulic servo loading cylinders of the hydraulic servo unit (2). The large bidirectional dynamic / static direct-shearing machine is used in coarse-grained soil shearing performance tests, coarse-grained soil shearing performance tests on reinforced contact interface and coarse-grained soil shearing performance tests on concrete interface under the dynamic / static loading effects of simulation traffic loading.

Description

technical field [0001] The invention relates to a direct shear testing machine for coarse granular soil, in particular to a large-scale bidirectional dynamic and static direct shear testing machine for the contact interface of coarse granular soil. technical background [0002] Coarse-grained soil fillers are widely used in subgrade engineering. The shear properties of coarse-grained soils, the shear properties of the contact interface between coarse-grained soil and reinforcement, and the shear properties of the interface between coarse-grained soil fillers and pavement structures have attracted much attention. Dynamic and static direct shear tests of soil contact interface are becoming more and more important. At present, the large-scale shear testing machine for coarse-grained soil interface test has the following deficiencies: ①The test stress path deviates greatly from the actual shear path in road engineering, especially the shear test under the simulated traffic dynam...

AI Technical Summary

Problems solved by technology

At present, the large-scale shear testing machine for coarse-grained soil interface test has the following deficiencies: ①The test stress path deviates greatly from the actual shear path in road engineering, especially the shear test under the simulated traffic dynamic load effect; ②The shear direction Relatively simple, it is impossible to realize two-way (X-axis direction and Y-axis direction) shear at the same time, especially the shear under two-way dynamic loading

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