Research On Deformation Behavior Of Highway Widening On Soft Soil Foundation

Highway widening on soft soil foundation is a new subject in highway engineering. Although we has obtained some valuable experience in completed engineering,the related theoretical achievements are less, no systematic regulations, new and old roadbed settlement characteristics understand a little, and need further research.Taking the widening engineering of jin-bin highway as a background, from actual problems on soft soil ground,based on the numerical simulation and measured data for new and old contrast of embankment settlement characteristics of the system research, main content as follows:1.analyzes the settlement characteristics by shallow processing and geogrids effect on soft foundation, calculation and analysis show that the layer of geogrids , the location and the modulus are basically no influence on vertical displacement,the limit of the lateral deformation is obvious effect, when geogrids are located in the bottom and top of gravel,the value of lateral displacement is minimum.2.Due to the jet grouting pile to dominate settlement in the widening projects,the effects of the filling density, the filling modulus,the gravel modulus and the pile modulus are analysised. the results show that, with the decrease of the filled soil, embankment settlement,differential settlements and lateral displacement severely reduced, Therefore, lightweight filler application to broaden the project is very reasonable in project cost allowed conditions; As the increase of filling modulus and cushion modulus,embankment settlement and differential settlements increased, the lateral displacement almost no influence. As the increase of pile body modulus, the biggest displacement of embankment drastically reduce , but modulus increases to certain values, sedimentation value hardly changes.along with the increase of pile body modulus,lateral displacement and differential settlement is very small.3. To study the PTC pile composite foundation of the stress ratio of pile-soil,pore water pressure,the PTC pile composite foundation, Disturbance effect which the method of PTC hammer is analyzed and evaluated.