Pore pressure response of saturated soils around a penetrating object

• Published in: Computers and geotechnics Vol. 32; no. 1; pp. 37 - 46
• Main Authors: Song, Chung R., Voyiadjis, George Z.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2005; Elsevier
• Subjects: Calibration chamber; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Engineering geology; Exact sciences and technology; Finite strain; Penetrometer; Pore pressure; Updated Lagrangian reference frame; Penetrometer; Calibration chamber; Finite strain; Updated Lagrangian reference frame; Pore pressure; digital simulation; finite element analysis; soils; saturated materials; pore pressure; penetrometers
• ISSN: 0266-352X; 1873-7633
• DOI: 10.1016/j.compgeo.2004.11.003

It is known that the excess pore pressure response of saturated soils around a penetrating object varies depending on the location of the pore pressure measuring point. In this work, the pore pressure response of soils measured during the penetration test is analyzed by the finite element analysis based on the coupled theory of mixtures. It is also experimentally investigated using the Louisiana State University calibration chamber test. From this study, it is found that the pore pressure distribution along a penetration object is higher at the face and lower at the shaft. This phenomenon is typically believed to be due to two different mechanisms of excess pore pressure generation. The first is the shear induced pore water pressure and the second is the compression induced pore water pressure. It is shown that the interaction and accompanying dissipation of the shear-induced pore pressure and compression-induced pore pressure play a major role for the excess pore pressure response at the shaft of the penetrating object.