Abstract：Research purposes: In order to realize the strict control of the post construction settlement of railway subgrade of ballastless track , the pile-mesh structure subgrade is adopted in the ballastless track integrated experimental section of Suining-Chongqing Railway for the first time, so it is necessary to do the research on mechanism and load bearing characteristic of pile-mesh structure.
Research methods : The experimental researches are done on the load bearing characteristic and mechanism of the pile-mesh structure subgrade of ballastless track by adopting numerical calculation analysis, centrifuge model test, indoor cyclic loading dynamic model test and in-site test and etc. Based on the research results, the definition, working principle and design technology of the pile-net structure subgrade are discussed.
Research results:The definition , working principle and design technology are presented according to the outcomes of test and research.
Research conclusions : As the pile-mesh structure subgrade has the merits of less deformation due to”vertical settlement and less deformation-stable time, so the pile-mesh structure can be used for strengthening the deep, soft and weak subsoil of ballastless track railway, completed embankment and the special subsoil, such as in the turnout area of ballastless track.
2007, Vol. 24 
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