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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:岩土工程学报

Affiliation of Author(s):建设工程学部

Volume:33

Issue:1

Page Number:150-158

ISSN No.:1000-4548

Abstract:The apparatus for static and dynamic universal triaxial and torsional
   shear soil tests is employed to perform stress-controlled coupling
   vertical and torsional shear tests under different three-dimensional
   initial anisotropic consolidation stress conditions. Through
   experimental tests the effects of the initial orientation angle of the
   major principal stress, the ratio of the two stress components and the
   cyclic stress level on the pore water pressure and the strength of the
   saturated marine clay are examined. The initial orientation angle of the
   major principal stress has a significant influence on the
   characteristics of pore water pressure: as the angle increases, both the
   residual pore water pressure and the amplitude of fluctuated pore water
   pressure increase. Meanwhile, the relations between the normalized
   residual pore water pressure ratio and the cyclic number ratio with
   different initial orientation angles of the major principal stress are
   established. Under the conditions of keeping the area bounded by the
   elliptical stress path unchanged, there exists a certain critical value
   for the ratio of the axial and torsional shear stresses. At this
   critical value, the residual pore water pressure is the lowest. Both the
   fluctuated pore water pressure and the residual pore water pressure
   increase with increasing cyclic stress ratio. However, there is great
   difference between the high and the low stress levels. Furthermore, the
   critical cyclic stress ratio is determined according to the time history
   curves of pore water pressure under different cyclic stress ratios. The
   initial orientation angle of the major principal stress has a
   significant influence on the dynamic strength: as the angle increases,
   the dynamic strength decreases. The dynamic strength curve indicates
   that there is basically a linear relationship between the cyclic stress
   ratio and the logarithm of the cyclic number required at failure

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