Stabilization of soft foundation of small road bridge & culvert

According to definition and its characteristics of the soft soil, emphasized to introduce several kinds method that the soft soil foundation reinforce: That is solid method, the sand(soil) post crowded of intensive, small wodden post of fill, deep flap the method of intensive, sand mat layer method(change the native method), revolve and spray method etc.. Combine to introduce them respectively each from of applicability and merit and shortcoming.