首页|Direct Shear Testing Apparatus for Saturated Rock Joints

Direct Shear Testing Apparatus for Saturated Rock Joints

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  • NETL
  • NSTL
  • Amer Soc Testing Materials
A novel shear test apparatus has been designed and built to test saturated jointed rock specimensunder normal and shear loading, capable of housing seismic transducers to monitorsimultaneously the mechanical and geophysical response of the rock joints during shear.The system comprises a sealed pressure chamber and a biaxial compression frame. The internaldimensions of the chamber are 177.8 mm × 228.6 mm × 381.0 mm to accommodate a rockspecimen with dimensions 152.4mm× 127.0 mm× 50.8 mm. The chamber ismade of aluminumto reduce its weight and is designed to sustain a maximum chamber pressure of 10 Mpa, whichis considered sufficient to be able to saturate a wide number of rocks. Structural calculations ofthe chamber are performed with the finite element method (FEM) software, ABAQUS, with thecriterion of a maximum deflection of 1 mm at maximum chamber pressure, which is smallenough to prevent the loss of seal between the loading shafts and the chamber. The rocksused in the study are Indiana limestone and Sierra White granite. B-value tests conductedon cylindrical specimens of the rocks placed inside the chamber show that the back pressuresrequired to achieve saturation are 3.5 Mpa for Indiana limestone and 5.0 Mpa for Sierra Whitegranite. The chamber performance has been evaluated by comparing the changes of volume ofthe chamber at different pressures, measured in the laboratory, with those predicted withABAQUS. The successful completion of a number of repeatable direct shear tests, on tensile-induced rock joints in dry and saturated conditions specimens, has further establishedthe correctness of the chamber design and its operation.

shear testing apparatuspressure chamberbiaxial compression frameB-value testsaturatedrock

Kyungsoo Han、Laura J. Pyrak-Nolte、Antonio Bobet

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Lyles School of Civil Engineering,Purdue University, 550 StadiumMall Dr., West Lafayette, IN 47907,USA

Lyles School of Civil Engineering,Purdue University, 550 StadiumMall Dr., West Lafayette, IN 47907,USA||Department of Physics andAstronomy, Purdue University,525 Northwestern Ave., WestLafayette, IN 47907, USA||Department of Earth,Atmospheric and PlanetarySciences, Purdue University, 550Stadium Mall Dr., West Lafayette,IN 47907, USA

2024

10.1520/GTJ20230483

Geotechnical testing journal

Geotechnical testing journal

SCI
ISSN：0149-6115
年,卷(期)：2024.47(6)
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