Influence of the rotation of principal stress directions on undrained shear strength

Abstract

Infl uence of the rotation of principal stress directions on undrained shear strength. The paper presents the results of research on natural cohesive soil carried out in the Hollow Cylinder Apparatus (HCA). The main goal of this study was to determine the values of undrained shear strength at different angle of the rotation of principal stress directions. The research were carried out with anisotropic consolidation and shearing in undrained conditions (CAU) on cohesive soil with overconsolidation ratio (OCR) equals 4 and plasticity index (I p ) about 77%. The results of laboratory tests allow to assess the infl uence of the rotation of principal stress directions on undrained shear strength.

Evaluation of the Change in Undrained Shear Strength in Cohesive Soils due to Principal Stress Rotation Using an Artificial Neural Network

“…In the case of clay, the value of K o during the consolidation process was equal to 0.97, whereas for sandy silty clay, K o was equal to 0.83. After dissipation of excess pore water pressure, parameter b was changed to 0.5 (Equation (1)) [44].…”

Analysis of Embedded Retaining Wall Using the Subgrade Reaction Method

“…1) has been used as an example for calculating internal forces and displacement. The results of ground investigation and the selected ground parameters needed to carry out the calculations for Warsaw subway and other structures in Warsaw are outlined in papers [1], [5], [7], [14] prepared by the Department of Geotechnical Engineering of Warsaw University of Life Sciences and presented in Fig. 1.…”

Effect of Stress Direction on the Undrained Monotonic and Cyclic Behaviour of Dense Sands

“…This de nition provides a convenient distinction between inherent and induced anisotropy, which was later modi ed [11,28{30] to involve previous strain as a part of the initial anisotropy and consider previously induced anisotropy as the initial anisotropy for subsequent conditions [22]. Many researchers have simulated some eld loading situations such as wave loading on seabed deposits, multidirectional earthquake loading in level ground, and lateral cyclic loading on the soil behind retaining structures that involve the rotation of the principal stress directions during shear in the laboratory tests [21,31,32]. The stress paths associated with these loading situations may be classi ed as non-proportional loading [18,21,33].…”

“…Many researchers have simulated some eld loading situations such as wave loading on seabed deposits, multidirectional earthquake loading in level ground, and lateral cyclic loading on the soil behind retaining structures that involve the rotation of the principal stress directions during shear in the laboratory tests [21,31,32]. The stress paths associated with these loading situations may be classi ed as non-proportional loading [18,21,33]. However, the boundary conditions in these studies varied greatly, and the primary focus was on regenerating simple shear conditions rather than systematically investigating the e ect of principal stress rotation and intermediate principal stress on the cyclic behavior of sands.…”