The Soil-bin Indoor Model Experiments Research On The Effect Of Drainage Consolidation For Soft Foundation Treatment With Pine Drainage Piles

The soft soil has been widely concerned as a bad geological condition,which is widespread in lakes,coastal and other regions.As more researches on soft soil foundation,the innovation and improvement of various soft soil foundation treatment methods are more and more.The pine piles have an over 2000 years' history now,which have a series of advantages,such as energy conservation and environment protection,low cost,simple construction,underwater durability.The pine piles have been used by people from ancient Dujiangyan,Lingqu and others world famous soft soil engineering to small and medium-sized water conservancy,highway,temporary retaining,engineering foundation today.We have find there are little theoretical researches on pine piles with a large number of literatures on engineering case of pine pile's utilization.The research group of author through the improvement of the traditional pine piles and combie drainage geotextiles with pine piles,with conducting the indoor model test.Pine wood was used to imitated the pine pile in the experiment,and the soil was taken from Nanchang dish lake.It is a typical soft soil with high water content,low strength,large pore ratio and high sensitivity.Based on the previous experimental works(Jiang Jinming,2016),further design more groups of experiment,through the analysis of experimental results,for the engineering design and application of drainage pine timber provide basic data.And we discuss the drainage layer of pine piles(geotextile),quantitatively evaluate the effect of drainage effect and the impact of approaches.The main research contents are as follows:(1)Measue on the basic physical and mechanical properties of the soil samples;(2)Study on consolidation test of soft soil foundation treatment of pine piles;(3)Study on consolidation text of soft soil foundation treatment of drainage pine piles;(4)Study on consolidation text of soft soil foundation treatment of drainage geotextile(no pine piles);(5)Study on consolidation text of soft soil foundation treatment of radial direction drainage pine piles(the upper laid impermeable membrane);(6)Discussion on design and calculation method of soft soil foundation treated by drainage pine piles.The test results show that the consolidation effect and bearing capacity of drainage pine piles is better than the pine piles,and the effect of consolidation drainage is mainly related to the length,consolidation pressure and consolidation time.The main reason is the the external drainage structure layer(geotextile)of drainage pine piles have radial drainage way,which greatly improve the drainage capacity of the composite foundation.So the drainage pine piles not only have good effect on Reinforcement and mandatory displacement of soil,but also have the function of consolidation draining.The pine pile usually references to two calculation methods of design when it applies in the practical engineering.It also discusses the experimental data finding that the design and calculation method of the soft soil foundation treated by the pine pile refering to composite foundation design calculation method is more reasonable.Through the study of indoor model test,it can be directly found that pine pile spraies surface with drainage structure layer(geotextile),which can be used to solve the problem of the consolidation and drainage capacity of pine piles.And it also shows the effectiveness and practicability of the soft soil foundation treated by the drainage pine piles at the same time.