Study on Application of Down-hole Dynamic Compaction in Treatment of Miscellaneous Fill in Urban Road Subgrade
In urban road design,there may be deep miscellaneous fill in subgrade.It is necessary to identify its nature,cause,type and scale,and then comprehensively consider the geological conditions,road grade,surrounding environment and engineering economy to formulate a treatment scheme.Several methods for treating the deep miscellaneous fill of an approximately 800-meter-long subgrade of a secondary trunk road in Xi'an are analyzed and compared.Among these treatment methods,the down-hole dynamic compaction(DDC)has the significant advantages,which is well suited for treating the deep and uneven soil with little influence on the surrounding environment,and its cost is relatively low.Therefore,the method of DDC is ultimately adopted to treat the miscellaneous fill subgrade.And the key indexes of bearing capacity and so on are detected.The detecting results indicate that the subgrade treated by DDC method effectively enhances its subgrade bearing capacity.Additionally,the compaction degree and deflection values of the roadbed top surface meet the requirements of road design.
subgrademiscellaneous filldown-hole dynamic compactionsubgrade bearing capacitydegree of compactiondeflection value
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