Study On Stress And Deformation Of The Soft Road Tunnel Under The Condition Of Coupled Htm

Coal as a primary energy is the support and lifeline of the national economy, however, after coal mining more than 40 years, coal resources has been drastically reduced in China. The new mine mining conditions is getting worse and the requirement of supporting is increasing; At the same time, most of new mine has entered the medium-term design life ,and even the aging stage, the latter part of the maintenance task being more difficult. Therefore, supporting design and controlling the rock have become an important issue in front of the coal industry staff. Deformation of surrounding rock which is a reflection of the most active rock, whether accurately forecast the deformation of rock tunnel for having a choice of supporting and controlling surrounding rock is important reference value.Under the conditions of deep mining ,the tunnel rock is in the environment of"three height"(high stress,high water pressure and high temperature),which have an important influence on tunnel force and deformation. Therefore, considering the deformation analysis of tunnel under the condition of thermal-hydrological-mechanical (H-T-M) coupling has a significant meaningful. This research focuses on building coupled model of HTM and analyzing to tunnel surrounding rock deformation. First of all, on the basis of previous work, we establish thermal-hydrological-mechanical coupled model, which has considered influence to the stress field under temperature stress and temperature strain and water stress, and the influence to the rock framework deformation under groundwater seeping. Then we establish value model through the large-general- finite element analysis software package Comsol Multiphysics (FEMLAB) to numerical calculation and analysis of deformation for tunnel surrounding rock, studying on mechanical behavior regularity which is effected by various factors including coefficient of side pressure and water pressure, ground temperature. Study shows that coefficient of side pressure has controlling effect on plastic area distribution regularity under the condition of thermal-hydrological-mechanical coupled model and have negative influence on tunnel stability.