Parameter sensitivity analysis is an important method for the geotechnical back analysis problems and the study for displacements and pore pressures against seepage-stress coupling parameters takes a crucial role in the study. Current literatures on the analysis of parameter sensitivity are only about single factor change method unable to take into account multi-factors change. Aiming at the multi-parameters sensitivity analysis of seepage-stress coupling model, a new method for evaluating the sensitivity of system parameters is put forward using Spearman coefficient in non-parameter statistics in this paper. Considering the actual case of radioactive waste disposal in the deep Boom clay formation in Belgium, the parameters efect on displacements and pore pressures around the tunnel are analyzed in detail. The presented method can provide the references for the influence of tunnel drainage on geological environment and back analysis of surrounding rock.
|Chinese Journal of Underground Space and Engineering
|Published - Oct 2008