对高填方路基沉陷现象的分析

造成高填方路基沉陷的原因之一是压实度不够。实践证明,路基的压实程度对路基的强度和稳定性影响极大,压实度不够的路基,在自然因素和行车荷载作用下,必然要产生较大的变形或破坏,这是由于未经压实的路基抵抗荷载及暴雨或水流冲刷的能力很低。与此相反,压实紧密的路基,强度提高,透水性降低,变形显著地减小,稳定性得到明显改善,可以避免大规模的破坏。压实度与土质、含水量、压实功能及压实工具和压实方法有关。施工时,应控制好最佳含水量,并根据不同的土质、不同的压实标准,选择不同的压实机具,确定最佳压实厚度、压实遍数,掌握好碾压速度,以获得压实的最大密实度,从而达到高填土路基沉陷的预防。

ANALYSIS OF SEDIMENTATION OF HIGH EARTH EMBANKMENT

The reason why high earth embankment is very easy to sink is that the degree of compaction is not adequate.Practice proves that stability and strength of the embankment are influenced by the degree of compaction greatly. If the compaction degree is insufficient, the embankment will be deformed or destroyed by weathering and vehicle repeatedly loading. This is because that undercompacted embankment has lower resistance to storm or water erosion.At the same time,for the embankment with high degree of compaction the strength is obviously higher, the water penetration lower, deformation reduced and the stability improved apparently .In this way, the large-scale damage can be avoided.The degree of compaction relates to the earth properties, moisture content, the function and capacity of compactor, and the procedures of compaction.The optimum moisture content should be controlled, the appropriate compactors and compaction speed should be selected, and the best compaction thickness and the number of compactions should be determined according to the criteria of compaction and the earth properties in order to get the adequate compaction degree and prevent unnecessary sedimentation of high earth embankment.