Rayleigh波评价强夯加固效果量化分析研究

Quantitative Analysis of the Evaluation of the Reinforcement Effect of Dynamic Compaction Using a Rayleigh Surface Wave

摘要:

为实现利用Rayleigh面波准确、高效地评价软弱地基的强夯加固效果,提出Rayleigh面波评价强夯法的量化分析技术。首先将现场采集到的面波频散曲线经过频散分析得到地基不同深度处的剪切波速,在试验室通过对现场取回土样的击实试验和剪切波速测试,得到不同孔隙比时土样所对应的剪切波速,作为本场地土的波速测定参照标准。提出夯击效果评价参数δ,通过对参数δ的计算使得利用Rayleigh面波测试实现对强夯加固效果的量化评价成为可能。最后通过对天津滨海新区某软土场地强夯加固工程的Rayleigh面波量化评价,证实了本方法的可行性。

Abstract:

A quantitative evaluating technique was employed to determine the accuracy and efficiency of dynamic compaction. The shear wave velocity of a foundation at different depths was obtained by inverting the dispersion curve of the Rayleigh wave. Using laboratory compaction and shear wave velocity testing of the soil samples from selected sites, the relationship between the void ratio and shear wave velocity was raised. This relationship was based on a wave velocity measurement reference standard at this site. A quantitative parameter δ was used to evaluate the dynamic compaction effect. On the basis of the calculation of this parameter and employing Rayleigh surface wave test evaluation, the effect of dynamic compaction was quantitatively evaluated. The relative quality of the soil and dynamic compaction effect was successfully determined using the proposed Rayleigh wave quantitative analysis technology.