Numerical Analysis And Experiment Study On Performance Of Reinforced Steep Earth Slopes

Combined with the research topic"Research on the High Fill Subgrade Reinforced Steep Soil Slope of Highway in Mountain Area and Environment Protection Skills"and based upon a plenty of in-situ test and interior full measure tests, this paper takes full advantage of composite medium theory to have made penetrating analysis about reinforced steep soil slops in terms of nonlinear finite-element. Compared with model tests and in-situ tests, the following conclusion can be reached through a great amount of calculation and analysis:1,This paper put forward finite-element computing patter of reinforced steep slops grade under the application of the Composite Medium Theory. It also writes integral programs for the non-linear analysis of equal parameter units. The contrast between the result of finite-element calculation and data of in-situ tests and model tests shows up that the various hypothesis and calculation theories in the finite-element calculation are feasible and that the results of numerical calculation are correct. Meanwhile, in accordance with the current problems of reinforced steep soil slop's configuration, the paper propose the simplified calculation model by virtue of the utilization of the composite medium theory, makes detailed comparisons among the finite-element calculating results, data of in-situ tests, conclusions of model tests and the calculation results using simplified calculating formulae. The final results illustrate that the simplified calculation formulae are capable of reflection reinforcement's putting force's actual distribution in the wall and they have engineering availability to a certain degree.2,The analysis and calculation upon reinforced soil slops shows that the real working situation of the reinforced soil walls is quite completed. As in the respect of internal quality of stability, the distribution of pulling force in each layer is uneven, with value and position varying according to different bracing condition, While in the respect of external quality of stability, the stress of the basement of the reinforced soil slops is almost in even distribution when the wall is much lower(lower than 6 meters), However, the distribution of the stress is close to the"S"type upside down when the wall is much higher(higher than 8 meters). Therefore, there is little possibility that the wall will capsize form the top to the foot. Traditional way of design and calculation method that has been over simplified and hypothesized get a result that will be quite different form the real situation, So the application of it will have great limitations.3,The maximum putting force of stepped reinforced soil slops'reinforcement distributes in the same way as logarithm helical curve at the back of the wall. The intersection point on the foundation subsits at the back of the wall away form which is 1.0m rather than at the bottom of the wall.4,With regard to stepped reinforced soil slops and erected reinforced soil slops occupies to distortion capacity and load bearing. It still finds out that among the total the steps'width exerts a fairly great influence on the entire structure. However, the calculation theory - 0.3H Method of reinforced soil which is stipulated by the existing norms produces comparatively great deviation in the stepped reinforced soil wall. Accordingly, the results of calculation pose comparatively great risk.5,The plastic zone of reinforced soil configuration's doesn't develop in a rectilinear way, but that there appears a local point in the reinforced soil compound unit of the central retaining wall. The local point enters the plastic zone, which threads together in the direction of reinforcement with the increase of load. At this time the plastic zone of the retaining wall begin to develop upward and downward, and when it passes through the earth parting of the reinforced earth compound unit, there doesn't appear a plastic zone in the direction of reinforcement bur in a plastic zone in the direction of reinforcement but in an upward and downward direction. Therefore we can draw up a conclusion that judging whether the reinforced configuration is unsteady is to make sure whether the plastic zone in the reinforced earth compound unit has formed. As long as concentrated plastic zone does not form in the reinforced earth compound unit, the reinforced soil will be unsteady, even if the plasticity of the earth in the compound units link up.