Research On Related Problems Of The Soft Soil Foundation On Port Area Highway

With the fast development of our country's economy, state devoted great efforts to promote Infrastructure,and more and more roads are inevitably constructed on soft soil foundations. If bearing capacity of soft soil foundations is low and they are not treated as well, the engineering hazard will occur. So the research on soft soil foundations becomes more important. The definition and classification of soft soil are quite different from countries to countries, even from all walks of life in our country. We give our comment on this issue after analyzing and comparing different definitions of the soft soil,and try to summarize the soft soil foundation according to the classification and the engineering features of soft soil. There are many methods to teat the soft soil foundation. For each method it has both advantages and disadvantages.In the thesis, we sum up all different methods of treating soft soil foundation, then point out shortcomings of some methods. When the high-grade highway is to be constructed on the soft soil foundation, it is necessary for us to have a soil monitor to ensure that the roadbed is stable. Since the settlement and stability are the main programs in the process of monitoring, we synthesis for the soft soil foundation the monitoring items, the monitoring schemes and so on. There are two aspects for the computation of the settlement, i.e. to understand the consolidation of the soft soil when load is applied on the one hand and to calculate the settlement of the soft soil after construction on the other hand. There are also many methods for the calculations of the settlement based on observed data. For the GM(1,1) model, BP neural network model and the combination of GM with neural network model, we proceed a study and conduct a finite element simulation analysis based on data in laboratory and field experiment.Besides, we carry out a relevant research on the muddy soil foundation at study area supported project. We analyze the characteristics of the soft soil foundation according to the data in laboratory and field experiment, optimize the methods for the soft soil foundation treatment, and conduct settlement and stability monitor for the soft soil foundation. Then we make a judgment for the treatment effect by analyzing the monitoring data, and use GM(1,1) model and BP neural network model, the combination of GM and neural network model to predict the amount of settlement during the period of pre-loading according to observed settlement data. The calculation is fulfilled with the use of Matlab. According to the experimental data, we carry on a simulation with the software of ANSYS and discuss the settlement and stability of the roadbed.