置换减载与加筋复合处理方法对路基不均匀沉降控制效果研究

Control effect of uneven settlement of subgrade by composited method of replacement load shedding and reinforced embankment

为了解决高速公路常见的不均匀沉降问题,提出了一种置换减载与加筋相结合的复合路堤处理技术。该技术利用具有一定刚度的PVC管置换路堤填土,减轻路堤自重荷载的同时发挥圆管的加筋作用,使得地基中附加应力减小,从而达到控制路基不均匀沉降的目的。为了验证该技术对地基不均匀沉降的控制效果,开展了置换减载与加筋复合处理路堤与未经处理普通路堤的大型模型试验,通过观测其在多级荷载作用下不均匀沉降的发展规律及沉降随时间的变化规律,并结合沉降理论进行分析验证,揭示了置换减载与加筋复合处理方法控制不均匀沉降的机制。该成果为加筋路堤或轻质置换路堤的设计及计算提供了理论依据。

To solve the common problem of uneven settlement of highway, this paper proposes a new technology for composited embankment by combining the replacement load shedding with reinforcement. In the new technology, the polyvinyl chloride(PVC) pipes are used to replace the embankment fill, which can not only reduce the self-weight load of the embankment but also exert the reinforcement of the circular tube at the same time. Thus, the additional stress of foundation is decreased, which controls the ground subsidence correspondingly. To verify the control effect of the technology on the uneven settlement of subgrade, a series of large-scale comparison model tests is carried out on the composited embankment and untreated ordinary embankment. Combining the settlement calculation theory and the measured results, the control mechanism of uneven settlement by the composited method is analyzed. The results provides a theoretical basis for the design and calculation theory of reinforced embankment and light replacement embankment.