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通过理论分析、数值模拟和现场试验等方面对动力排水固结法加固饱和软粘土地基的机理与效应以及施工工艺进行了比较系统的研究。针对动力排水固结法的基本特点 ,基于Biot固结理论和有效应力原理 ,建立了轴对称动力固结问题的流、固耦合分析有限元基本方程 ,进而编制了流、固耦合近场瞬态波动轴对称有限元时域模拟程序。对饱和软粘土地基动力排水固结进行了数值模拟分析 ,得出了动力排水固结过程中土体动态响应基本规律和加固深度与影响因素之间的关系。研究了强夯作用下地基的振动特性 ,提出了最小安全距离的确定方法和减振措施。通过现场试验 ,进行实测分析和数值模拟分析 ,揭示了动力排水固结中孔隙水压力的长消规律 ,研究了动力排水固结法的加固效应 ,进而证实了信息化施工的可行性。最后 ,探讨了动力排水固结法的加固机理 ,并提出了相应的施工工艺 ,可供实际工程参考
Through theoretical analysis, numerical simulation and field test, the mechanism and effect of dynamic drainage consolidation method on saturated soft clay ground and the construction technology are systematically studied. Aiming at the basic characteristics of dynamic drainage consolidation method, based on Biot consolidation theory and effective stress principle, the finite element basic equations of flow and solid coupling analysis are established, Wave axisymmetric finite element time-domain simulation program. The dynamic drainage and consolidation of saturated soft clay foundation are numerically simulated and the relationship between the basic law of soil dynamic response and the depth of reinforcement and the influencing factors during dynamic drainage consolidation is obtained. The vibration characteristics of the foundation under dynamic compaction are studied, and the method to determine the minimum safety distance and the vibration reduction measures are proposed. Through field test, analysis and numerical simulation analysis were carried out to reveal the long-term elimination law of pore water pressure in dynamic drainage consolidation. The consolidation effect of dynamic drainage consolidation method was studied, and the feasibility of information construction was verified. Finally, the reinforcement mechanism of dynamic drainage consolidation method is discussed, and the corresponding construction technology is proposed, which can be used for practical engineering reference