Research On Soil Pressure Distribution Caused By Foundation Pit Excavation Supporting Structures

Due to the rapid development of the city, increasing the number of high-rise buildings, excavation pit deeper toward larger trends. Excavation accident occurred, mostly due to the structural design of the excavation, the earth pressure improperly charged to the final during excavation retaining structure deformation caused by too much. Supporting structure with pressure using classical earth pressure theory for solving the distribution form, and can not meet the actual needs of the project, the actual soil is not homogeneous, and with the construction phase progresses, pit slope and soil horizontal displacement group pit support is provided for the pressure distribution in the soil has a certain impact. This article supporting structure caused by the distribution of the earth pressure excavation through research, not only can improve the supporting structure design theory, support structure optimization design, and it can reduce the risk of excavation accidents.Through simulation excavation of underground excavation in the context of, first, the actual excavation monitoring, monitoring data were analyzed with a finite element software re-use of the entire excavation process simulation, simulated model, the simulation model generated data collation analysis, followed by the excavation measured data and numerical simulation results combined with each other to compare, research under different conditions conditions, excavation supporting structure caused by the distribution of earth pressure conditions, and excavation of the slope and soil horizontal displacement in foundation support is provided for earth pressure distribution.By studying the following conclusions:1) Supporting structure caused by excavation of earth pressure distribution is not showing Coulomb-Rankine earth pressure theory for solving triangular distribution of the results, but showing a nonlinear characteristic fluctuation of reason, mainly because during excavation, earth pressure of supporting structure affected by soil properties, slope soil deformation, in foundation support and other factors.2) In different conditions pit excavation diaphragm walls have had to pit inward movement of the trend, making diaphragm walls at rest earth pressure to a certain release, so along underground wall wall of earth pressure lowering occurred.3) When the excavation continues, with more and more on the supporting structure of reinforced concrete beams supporting the continuous setting, can be effectively suppressed earth pressure increases, even in the vicinity of the position of reinforced concrete beams supporting the set earth pressure produced a certain decreasing tendency.4) Soil has a certain rheology, when excavation continued progress, breaking the limit equilibrium state of the original natural state of the soil, causing the strength of the soil itself to resist shear forces occurred decreased, resulting in earth pressure has produced some of the larger capacity, but at the same time, with the continuous growth of earth pressure, soil stress itself has been increased, and therefore the value of earth pressure drop took place.