交通荷载作用下软土地基的土工格栅加筋效应分析

Analysis of Geogrid Reinforced Effect of Soft Ground Under Traffic Loading

为了探讨不同土工格栅加筋方式对深软土地基应力变形特性和不均匀沉降的控制效果,建立了土工格栅与土的动力相互作用模型,通过分析地基变形、地基应力水平、加速度传递特性以及格栅的受力情况,研究在交通荷载反复作用下,土工格栅的加筋效果和机理。计算结果表明:土工格栅加筋基层结合格栅包裹细碎石加筋垫层处置深软土地基的三层加筋法可以有效地减小软土地基的沉降,弱化地基内的应力水平,限制交通荷载的影响范围,是一种切实有效的加筋方法。

Firstly, the non-linear finite element method was used to simulate the effect of the different reinforced types of geogrid to variation characteristic of stress and differential settlement in the deep soft ground. Then, a kind of soil-geogrid dynamic interaction model was established. Through analyzing the soft ground deformation, stress level, tension stresses in geogrid and acceleration transfer characteristic, reinforced effect and mechanism of geogrid were studied under the traffic loading. The results show that three layers reinforced method for the reinforced sand blanket of the small gravels enwrapped by geogrids and the reinforced base layer can effectively reduce the civil embankment settlements and the stress levels in the soft ground. The impacted embankment ranges due to the traffic loadings are limited by the method. So it is a kind of feasible and effective reinforced method.