基于能量原理的静动力排水固结法有效加固深度研究

Research on Effective Reinforce Depth of Static-Dynamic Drainage Consolidation Method Based on Principles of Energy

对静动力排水固结法加固软土地基,目前主要通过研究冲击作用下超软土的孔压、土压以及沉降、强度的变化,以探求其响应规律及加固机理,对于软土地基的有效加固深度,目前仍没有一个非常精确的公式。基于动量守恒和能量守恒原理,将夯锤与土体接触后运动简化为匀减速直线运动,并结合广州南沙现场的物理力学参数,得到一个能够较准确地计算有效加固深度的公式。通过与现场原位监测数据对比,表明该公式是可行的。为类似软土地基处理工程有效加固深度值提供一定的借鉴和指导意义。

The response regularity and reinforcement mechanism of soft soil foundation reinforced by static and dynamic drainage consolidation method are usually obtained by analyzing the pore pressure,soil pressure,settlement,and strength variations under compaction.However there is no precise formula for the effective reinforce depth.In this research,we obtained a precise formula for the effective reinforce depth of soft soil foundation based on the principles of momentum conservation and energy conservation.The contact between hammer and soil is simplified as uniform deceleration linear motion.By comparing the calculated result with the field in-situ monitoring data of an engineering site in Guangzhou,we verified the feasibility of this formula.This research could be a reference for determining the effective reinforce depth of such soft soil foundation.