Effect of Initial Principal Stress Direction on the Dynamic Characteristics of Carbonate Sand
  • 【摘要】

    The dynamic characteristics of carbonate sand under wave loads are very important for constructions on the ocean floor. The initial principal stress direction has been known to exert some influence on... 展开>>The dynamic characteristics of carbonate sand under wave loads are very important for constructions on the ocean floor. The initial principal stress direction has been known to exert some influence on the dynamic characteristics of sand during cyclic loading. In an effort to investigate this aspect of the problem, several series of cyclic undrained tests were carried out on a saturated and loose sample of carbonate sand using a geotechnical static and dynamic universal triaxial shear apparatus. In this test apparatus, a hollow cylindrical sand specimen is subjected to a simultaneous application of both triaxial and torsional modes of shear stresses, which brings about the continuous rotation of principal stress axes. The test results indicated that the initial principal stress direction has a considerable influence on the dynamic strength of loose carbonate sand and with the increase of initial orientation of principal stress, dynamic strength will be reduced, the cyclic pore pressure increased, but the residual pore pressure reduced. 收起<<

  • 【作者】

  • 【作者单位】

    School of Civil Engineering and Mechanics/Institute of Rock and Soil Mechanics/Institute of Geotechnical Engineering

  • 【刊期】

    地球科学学刊 SCI 2005年4期

  • 【关键词】

    triaxial-and-torsional coupling cyclic shear tests  carbonate sand  initial principal stress direction  cyclic strength  anisotropic consolidation 

  • 【基金项目】

    中国科学院资助项目 the Ministry of Science and Technology's Surveying Project of the Nansha Islands and Its Adjacent Sea Areas