Dynamic Compaction Processing The Bearing Capacity Of Muddy Land Base

In the engineering practice of Tongxin industrial park in Shenzhen, method of systemic analysis was applied for determining parameters of dynamic compaction dealing with silt and ultimate bearing capacity of gravel stake.First, the circumstance of geology, reliability of technology, cost of engineering, complexity of construction, scheduled time, experience of cite and effect of all over circumstance which will affect the parameters choosing were investigated. The Fuzzy model of multi-objection system was applied in evaluating the soil treatment methods. Then, an optimal parameters of dynamic compaction dealing with the Tongxin industrial park was acquired.Through the in site test, the relationship between the bearing capacity and energy of dynamic compaction was analyzed. It is proved that the bearing capacity accrete with the energy, but the scope of the accretion will reduced with it. The result also indicated that under the same energy and times of compaction, the pressure of hammer has little connection with the bearing capacity. The relationship between the bearing capacity and energy of dynamic compaction can be showed as follows:fk =57.996 + 0.1066E-5.89x10-6E2where fk is the bearing capacity of foundation and E is energy of dynamic compaction.Based on the analysis and conclusion of the theoretical methods, research has been made on the ultimate bearing capacity of gravel stake by predicting the entire curve of fast load test.The most important difference between the slow test and fast load test is, in the former, the settlement under each load reaches to a state of steady, while it is unsteady in the latter test. In the fast load test, loads are made every equal interval, on each load, eight data of settlement are observed which are applied in the GM(1,1) model. The steady settlement under each load is predicted which is in accordance with that of the slowload test. On the basis of above, the entire curve of P~S is obtained, and the ultimate bearing capacity can be acquired through the corresponding point (P0.06) of the curve.