A New Direct Shear Apparatus for Rock Joints Specialized in Cyclic Loading.

2 The schematic and simplified flowchart of the cyclic shear loading test device Note, to improve the accuracy for cyclic shearing, there are two separate shear servo valves, one for each shear jack. 1) specialized in cyclic shear loading for rock joints was developed, and tested on artificial joint models under conventional monotonic shear test, and cyclic shear tests with simple and complex stress path. 4a were obtained by setting the stop target as: 2 mm of shear displacement under 0.5 MPa of normal stress, then - 3 mm of shear displacement under 1 MPa of normal stress, followed by 4 mm under 1.5 MPa, ..., until 8 mm of shear displacement at 4 MPa of normal stress was reached. Keywords: Rock joint; Direct shear; Cyclic shear; Shear apparatus EN Rock joint Direct shear Cyclic shear Shear apparatus 4321 4327 7 08/06/21 20210801 NES 210801 Introduction The mechanical behavior of rock joint has always been an important issue in the field of geotechnical practice. [Extracted from the article]