Inverse Analysis And Prediction For The Settlement Of Embankment Of Expressway On Soft Soil

The stability and deformation are the main problems for expressway constructed on the soft soil ground. The requirement of stability is easily reached, due to the design height of embankment is several meter. For embankment engineering of expressway, where the pavement deformation is strictly limited, the settlement of soft soil ground becomes the key engineering technique problem. The precision of the embankment's settlement forecast and analysis should be higher because the design of the expressway back-work settlement is exactly confined. Therefore, the traditional algorithm method can't meet the demands. Based on the uncertain factors affecting embankment's settlement, the paper makes some research work.For important engineering or important embankment, the method of parameter inverse analysis based on model discerning is used to calculate the embankment's settlement. According to the principle of model discerning and the feature of embankment's settlement, the calculation model of soft soil ground's settlement is divided into the material discerning of the first model and the best model, In order to consider the soft soil ground's settlement affected by the secondly consolidation in the later stage, the Merchant visco-elastic model based on the elastic model and the non-linear-elastic model is adopted.For the ordinary engineering, the curve fitting methods based on model discerning are introduced to calculate the embankment's settlement. On the basis of the uncertainty load factors which influence embankment's settlement, the vehicle load and the step-exert construction load are studied by quantity. According to the Terzaghi's consolidation theory, the average consolidation degree formulas of the corresponding situations are inferred. Moreover, the feature of the embankment's consolidation in the effect of uncertainty load factors is studied. At the same time, based on analyzing the step-exert construction load, the index method is improved.The inverse analysis method based on model discerning and all these curve fitting methods are used to forecast settlement of Xuzhou-Suqian expressway after completing. The result from calculation and analyzed shows the thinking and the method in the paper are suitable, and it can be proved its rationality and feasibility in studying and forecasting settlement after construction of the embankment.