| Engineering practices show that the dynamic compaction method has simple construction and good reinforcement effect, the use of economic advantages, and thus been paid great attention in engineering around the world. But, so far, the calculation in the design of dynamic compaction is still highly empirical and qualitative level. So the research of ground deformation law has important significance to perfect the design of the dynamic compaction theory and improve the application level.The characters about dynamic foundation and the settlement of dynamic foundation under the load in the specific project are one of the control target of consolidation of foundation design. In terms of settlement control, the current method is that it uses the compression modulus value of dynamic compaction which should reach as control index usually. Due to the foundation experiences pressure along the depth change and dynamic soil be over-consolidated condition in different levels.therefore, compression modulus of dynamic soil only can be got by testing, whether it can meet the requirements and it can only be defined by trial ramming in different energy or to carry out by more secure way; And because the reinforcement effect change with depth, the compression modulus determined with the load test is not fully representative. On the other hand, the characters about dynamic foundation and the settlement of dynamic foundation under the load in the specific project after the settlement of foundation under engineering load relate to the soil before tamping, and it relates to Compaction amount with dynamic compaction, that is related to the ground deformation occurring during tamping.Based on the data obtained from the model test, numerical analysis, engineering examples and empirical equations, distribution model of vertical displacement versus depth under the center of tamped point can be concluded by fitting the vertical displacement data of model test, numerical analysis and engineering examples,and the vertical strain were calculated based on this model by using the statistics and the simple theoretical analysis. The relative degree of SPT Number improvement changed with relative depth are presented and the prediction of reinforcement effect change with depth is studied.lt is put forward that the vertical strain of the generalized model and vertical displacement calculation method of produced by the dynamic compaction strucking the ground. The estimation method of foundation settlement,the load-settlement curve,the method of foundation strength and deformation parameter are derived by making use of the relationships between soil property parameter and the ground deformations before dynamic consolidation;and the method of Construction Control is put forward on the basis of the relationships between Settlement of after dynamic consolidation under a certain load and the ground deformations.Topics are from national natural science foundation of China for tutor based on the parts of the research project about the deformation of the ground consolidation method to calculate, based on foundation settlement calculation method study about the ground deformation observation results and based on the research of the deformation of the ground construction control method. Research contents include settlement calculation and Character evaluation after tamping by using tamper hole depth and the average amount of sink hole depth.Finally,the application examples are given to validate the feasibility and effectiveness of the model and the equation.the result shows the established equation of estimating the foundation properties and the foundation settlement after the dynamic compaction provides a reliable, effective and convenient way for dynamic design and construction control of before the dynamic compaction. |
