Appliment And Study On Dynamic Compaction Ground Treatment For Collapsible Loess

Since the ground treatment by dynamic compaction has many merits such as convenient and fast performance, low consumption and so on, it has been frequently used in many large projects for approximate 30 years. However, its theoretical analysis is still an open question to be answered. Moreover, the existing research documents on varieties of the claries is miscellaneous and limited, which lead an extreme difficulty to deal with collapsible loess ground in practice. Thus, the key design parameters of dynamic compaction are very difficult to determined and precisely estimated, whereas, to exert the merit of ground treatment by dynamic compaction for collapsible loess ground, the most crucial and the most difficult design parameters are the selection of energy level of compacting and estimation of compaction subsidence of ground.In this paper, according to plenty of statistic datum from the practical projects of ground treatment by dynamic compaction, the main results are obtained as follows: (i) A relationship between energy level of compacting and dynamically compacted thickness is obtained; (ii) An approach to estimate compaction subsidence of ground is proposed; (iii) Based on (ii), the dynamically compacted thickness of the ground treatment by dynamic compaction for collapsible loess can be predicted; (iv) The concept of Dynamically Compacted Thickness is introduced, and conversion approach to compute the dynamically compacted thickness with regard to the dynamic compaction thickness of ground layer in the Criterion is obtained, which may provide an efficient way to assess the ground dynamic compaction treatment during detection.