Study On Force And Deformation Of Shallow And Large Section Loess Tunnel Lime Soil Compaction Pile Composite Foundation

Weak tunnel of loess highway tunnel bottom stress deformation has been a concern in academia and engineering. Due to the particularity of the engineering properties of loess, The characteristics of stressed deformation of tunnel bottom in loess highway tunnels, also with other mountain tunnel is a big difference。 in order to define the weak tunnel bottom stress deformation characteristics of loess tunnel, In order to put forward effective basal reinforcement measures, This paper takes the kiln tunnel as the engineering support, combined with field measurement by means of soft loess highway tunnel, the numerical simulation of tunnel surrounding rock stress distribution and deformation, basement reinforced tunnel and tunnel bottom settlement deformation control and so on carries on the analysis research, Concrete work is as follows:1. According to the field test results of Fu Jiayao tunnel,Analysis of the variation of the pressure of the wall, the pressure of the surrounding rock and the magnitude of the additional stress in the three lane loess tunnel under the shallow burial conditions. Get tunnel basal characteristics of surrounding rock stress distribution.2. Using the finite element software MIDAS/GTS, based on Fu Jiaoyao tunnel project,Numerical simulation of tunnel construction process under the condition of tunnel bottom treatment.Analysis of the distribution of the base tunnel surrounding rock pressure during excavation tunnel vertical displacement and horizontal displacement trends and the distribution end of the tunnel surrounding rock mass plastic zone.3. For use with lime-soil compaction pile the construction process of the tunnel are numerically simulated,Analysis of tunnel between the base pile stress, axial force and stress along the pile-soil compaction pile dust distribution deep, the distribution of changes in tunnel excavation process end of the tunnel and the tunnel surrounding rock displacement of the laws of the bottom plastic zones.4. By using the finite element software, Numerical simulation of the tunnel construction process under two conditions of water immersion,Under extreme conditions of soft loess tunnel base pile body stress, axial force of pile and the inter pile soil stress distribution along the depth direction, tunnel after the completion of support at the bottom of tunnel surrounding rock of vertical and horizontal to the bottom of the displacement and the changing law of the tunnel plastic area distribution characteristics.