Analysis Of Soil Pressure On Retaining Structures And Research On Pressure-reducing Measures In Frozen Soil Region Of Qinghai-Tibet Plateau

The natural environment of road engineering is particular and complicated in frozenregion of Qinghai-Tibet Plateau, the retaining structures in this region have various andcomplicated interactions with soil around them. The recurrence of soil pressure and frostheave pressure in warm seasons and cold seasons respectively, and frost heave and thawsettlement of foundation are the main cause of retaining structures damage such as crack andoverturn failure.The temperature field of ground surface after the construction of retaining wall is firstlysimulated by the FEM software ABAQUS, then the maximum seasonal thaw depthces wereobtained. Afterwards the thermal insulation effects of EPS panels to gravity retaining wallwere simulated in two ways, monodirectionally and bidirectionally. Meanwhile, thetemperature field distribution of cantilever retaining wall in one day is simulated.Another significant part of this paper is the simulation of frost heave pressures fordifferent retaining wall types and foundation conditions, by coupling with the temperaturefield in last chapter, then the regularity of its distribution is concluded. Through paving EPSpanels, their buffer effects to frost heave pressure are simulated. Additionally, the dynamicvariation of soil pressure of cantilever retaining wall due to the deflection of wall panel cuaseby therma gradient was simulated.Retaining structures of road engineering along National Road214were seriously damagedin Yushu earthquake, so seismic pressure applied on the retaining wall were speciallydiscussed in this paper, as well as the buffer effects of EPS to seismic pressure were analyzed.In summary, the damage types of retaining structures in frozen region were concluded,and through the numerical simulation of soil pressure, including static soil pressure, frostheave pressure and seismic pressure, on the basis of numerical simulation data analysis,guiding suggestions were proposed for the design and construction of retaining structures infrozen region of Qinghai-Tibet Pleteau.