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首页> 外文会议>6th International Conference on the Bearing Capacity of Roads and Airfields Vol.1, Jun 24-26, 2002, Lisbon, Portugal >In Situ Assessment of Stiffness of a Road Sand Embankment
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In Situ Assessment of Stiffness of a Road Sand Embankment

机译：公路路堤路堤刚度的现场评估

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The subgrade and foundation of a pavement have an important role to play in the design and performance of pavements because failure of these layers will inevitably lead to total reconstruction of the pavement. One method of ensuring a stiff foundation is to specify a minimum surface stiffness as an end product requirement for the completed foundation. Belgian practice is to use the plate load test as a practical and quick method of measuring this surface stiffness. For the construction of the ramps of a road bridge, two sand embankments were put in place and compacted with rollers. Compaction of the sand base course was evaluated using this plate load test and showed satisfactory results. However for stability reasons it was necessary to assess the quality of the sand densification due to compaction at greater depth. So additionally cone penetration tests and non-destructive seismic testing were used to evaluate stiffness profiles within the sand embankment. Both the CPT and SASW results showed good agreement. This paper will focus on the in situ assessment of the stiffness of the sand out of the PLT, CPT and SASW measurements. Correlations will be formulated between plate load moduli, dynamic shear moduli and point resistances for the compacted sand material. Finally the feasibility of the SASW method to determine the compaction quality at depth in a fast and economical way will be discussed.
机译：路面的路基和基础在路面的设计和性能中起着重要作用，因为这些层的破坏将不可避免地导致路面的完全重建。确保基础坚硬的一种方法是指定最小表面刚度作为完成基础的最终产品要求。比利时的做法是将板载荷试验用作测量该表面刚度的实用而快速的方法。为了建造公路桥梁的坡道，将两个沙堤放在适当的位置并用压路机压实。使用该板载荷试验评估了砂基层的压实度，并显示出令人满意的结果。但是，出于稳定性的原因，有必要评估由于在更深处的压实而引起的沙子致密化的质量。因此，另外还使用了圆锥渗透试验和无损地震试验来评估砂堤内的刚度分布。 CPT和SASW结果均显示出良好的一致性。本文将重点从PLT，CPT和SASW测量结果中对砂子刚度进行现场评估。将在板载荷模量，动态剪切模量和压实砂料的点电阻之间建立相关性。最后，将讨论SASW方法以快速，经济的方式确定深层压实质量的可行性。

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