Earth Pressure Distribution Under Different Retain Wall Displacement And Chest-Type Retain Wall Stability Analysis Research

The cavity reserved in the chest-type structure retaining wall can be backfilled with soil compaction,in this way,the engineering soil disposable material can be effectively used, while it can save a lot of concrete materials, reducing construction costs obviously, so we can pridicted that this type of retain wall will has broad application prospects. As the box-type retaining wall structure, especially high degree of box-type retaining wall is rarely appeared in the actual engineering application, the computational theory is not yet mature. In this paper, we use a practical project in which the chest-type retaining wall is used and the wall height is thirty meters as a calculation model,study the earth pressure distribution pattern,the capacity and the stablity of the retaining wall, research focus on the following areas:Firstly: active earth pressure distribution calculation and simulation of sliding surface. We use the finite element method to simulate the ultimate balance status of the soil behind the wall,use the process of plastic strain to simulate the destruction process of the soil,study the earth pressure under different soil inner friction angle.The study shows that: the development of the plastic strain was from a point to a surface ,when the surface is full,the soil after the wall came to the limited balance status,and the style of the broken surface like the arc type;second, with the backfill friction angle increases, the active earth pressure decreases.Secondly: we take the displacement of retain wall into account to study the earth distribution pattern. wall displacement mode which respective is T model, RBT model and ,RTT mode.The results shows that,under T mode, with the retaining wall displacement development the active earth pressure behind the wall and the passive earth pressure distribution are basic characteristics showed a linear distribution, while the bottom part near the wall, due to some restrictions with the computing model,the distribution has some gap with the linear distribution,second,RBT model and RTT mode have the similar earth pressure distribution, when n is very small and the displacement is very small, the active earth pressure and passive earth pressure distribution obviously showed a nonlinear distribution,especially in the expression of passive earth pressure distribution,with the increasing of n value and the displacement increases, the earth pressure distribution has a trendcy to linear distribution when the n value is large enough, the displacement has developed fully, the pressure distribution is similar to T mode.Through this research, we know that the earth pressure is changed with the change of the pyhsical characters of the soil and the displacement of the wall.We also know that the actual soil pressure distribution is nolinear.Thirdly:chest-type retaining wall stability analysis.As the soil behind the retain wall is backfill of the wall is layerly backfilled in the actual engineering construction,we use the birth and death element in ADINA to simulate the actual engineering construction process, on this basis,we calculate the earth pressure distribution behind the wall,according to results of earth pressure ,we calculate the stability and anti-overturning stability of the chest-type retain wall.