ADJUSTMENT OF HARDENING SOIL MODEL TO ENGINEERING GEOLOGICAL CONDITIONS OF SAINT-PETERSBURG

In order to obtain reliable results in solving numerical problems, it is important to select such model of material behavior that offers the best closest description of strength and deformation characteristics of this material. The hardening soil model is considered as the most fitting model for compact clays in solution of problems connected with reduction in intermediate effective stress at the concurrent shearing resistance of rocks with intrinsic nonlinear deformation in plastic domain. It is found that the reliable description of actual soil behavior requires calibrating parameters of the selected soil behavior model. The aim of this study is to obtain input parameters of the hardening soil model, such that are capable to describe reliably deformation of Proterozoic clay, to be then used in modeling geomechanical processes in Saint-Petersburg. The source for the selection of parameters was the lab test data on deformation of consolidated–undrained Proterozoic clay samples under triaxial compression. The samples were taken from enclosing soil mass of the Saint-Petersburg Metro stations Prospect Slavy and Bukharestskaya. The procedure is proposed for selection and calibration of input data and controllable parameters in the hardening soil model in Plaxis SoilTest, and the obtained results are reported. It is found that selection and calibration of the hardening soil model parameters should take into account expected range of lateral pressure (range of minor principal stresses), inside which subsequent modeling of underground structures will be carried out later on.

For citation: Alekseev A. V., Iovlev G. А. Adjustment of hardening soil model to engineering geological conditions of Saint-PetersburgGornyy informatsionno-analiticheskiy byulleten'. 2019;4:75-87. [In Russ]. DOI: 10.25018/0236-1493-2019-04-0-75-87.

Keywords

Plaxis, SoilTest, Proterozoic clays, three-axial testing, hardening soil model, numerical modeling.

Issue number: 4
Year: 2019
ISBN: 0236-1493
UDK: 624.191.22
DOI: 10.25018/0236-1493-2019-04-0-75-87
Authors: Alekseev A. V., Iovlev G. А.

About authors: A.V. Alekseev, Graduate Student, e-mail: a1exeev@yandex.ru, G.А. Iovlev, Graduate Student, e-mail: gregoriiovlev@gmail.com, Saint Petersburg Mining University, 199106, Saint-Petersburg, Russia. Corresponding author: G.А. Iovlev, e-mail: gregoriiovlev@gmail.com.

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