碎石桩在市政道路软土地基处理中的应用研究

Research on the Application of Gravel Pile in Soft Soil Foundation Treatment of Municipal Road

文章以某市政道路软土地基为研究对象,通过有限元软件建立碎石桩三维模型,分析了软土地基弹性模量、黏聚力及碎石桩置换率对鼓胀变形不同指标的影响规律,并通过现场监测获得了地表沉降、孔隙水压力情况等。研究表明,碎石桩鼓胀变形先增大后减小直至趋于稳定,加载量低于100 kPa,鼓胀变形较小,当加载量超过200 kPa,碎石桩鼓胀变形显著增大;增加软土地基黏聚力可有效控制鼓胀变形,还可使发生鼓胀变形的峰值位置逐渐下移;碎石桩置换率不应低于0.25;碎石桩处理措施能有效加固该工程软土地基。

The soft soil foundation of a municipal road is taken as the research object,and the three-dimensional model of gravel pile is established by finite element software.The influence of elastic modulus,cohesion and replacement rate of gravel pile on different indicators of bulging deformation is analyzed,and the surface settlement and pore water pressure are obtained through field monitoring.The results show that the bulging deformation of gravel pile increases first and then decreases until it tends to be stable.When the loading amount is less than 100 kPa,the bulging deformation is small;when the loading amount exceeds 200 kPa,the bulging deformation of gravel pile increases significantly;increasing the cohesion of soft soil foundation can effectively control the bulging deformation,and can also make the peak position of bulging deformation gradually move down;the replacement rate of gravel pile should not be less than 0.25;the gravel pile treatment measures can effectively reinforce the soft soil foundation of the engineering.