Analysis of sp Pillar Stability Experiment: Continuous thermo-mechanical model development and calibration

作     者：R. Blaheta P. Byczanski M. ermák R. Hrtus R. Kohut A. Kolcun J. Malík S. Sysala 

作者机构：Institute of Geonics AS CR Ostrava 708 00 Czech Republic VSB-Technical University of Ostrava Ostrava 708 33 Czech Republic 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2013年第5卷第2期

页      面：124-135页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the context of the international DECOVALEX Project (DEmonstration of COupled models and their VALidation against EXperiments) financed by Radioactive Waste Repository Authority (RAWRA),through Technical University of Liberec (TUL), Czech Republic SKB through its sp Pillar Stability Experiment project 

主　　题：In situ pillar stability experiment Continuous mechanics Damage of granite rocks Model calibration by back analysis Finite element method (FEM) 

摘      要：The paper describes an analysis of thermo-mechanical （TM） processes appearing during the Aspo Pillar Stability Experiment （APSE）. This analysis is based on finite elements with elasticity, plasticity and dam- age mechanics models of rock behaviour and some least squares calibration techniques. The main aim is to examine the capability of continuous mechanics models to predict brittle damage behaviour of gran- ite rocks. The performed simulations use an in-house finite element software GEM and self-developed experimental continuum damage MATLAB code. The main contributions are twofold. First, it is an inverse analysis, which is used for （1） verification of an initial stress measurement by back analysis of conver- gence measurement during construction of the access tunnel and （2） identification of heat transfer rock mass properties by an inverse method based on the known heat sources and temperature measurements. Second, three different hierarchically built models are used to estimate the pillar damage zones, i.e. elas- tic model with Drucker-Prager strength criterion, elasto-plastic model with the same yield limit and a combination of elasto-plasticity with continuum damage mechanics. The damage mechanics model is also used to simulate uniaxial and triaxial compressive strength tests on the ,Aspo granite.