土石方填筑体密度检测的瞬态面波法研究

Application of Transient Surface Wave Method for Unit Weight Estimation of Earthwork Backfills

土石方填筑体密度是评价填筑质量的关键指标,采用传统的检测方法耗时耗力,且检测结果受人工操作因素影响较大。以鄂州花湖机场的大型场地土石方填筑体为研究对象,对比分析了压实后的填筑体多道瞬态面波检测的波速结果以及传统灌水法获得的压实料干密度结果,发现二者间具有良好的线性关系,由此提出了通过面波波速对填筑体密度进行检测的新方法及其计算公式。同时,基于大量的现场填料筛分试验结果,对应用瞬态面波法进行土石方填筑体质量检测的适用条件进行了限定,为瞬态面波法应用于土石方填筑体质量检测提供了试验基础。

The unit weight of earthwork backfills is the key index to evaluate the backfill quality.It is both time and labor consuming to estimate the unit weight by the traditional method,and the test results are significantly affected by the operation factors.In this paper,a large-scale earthwork backfills test results of Ezhou Huahu airport project are presented.The wave velocity of the multi-channel transient surface wave of the compacted backfill material and the dry density results obtained by the traditional irrigation method are compared and evaluated.It is found that there is a good linear relationship between both methods.Therefore,a new method and its calculation formula for estimating the unit weight of the backfill material by the transient surface wave velocity are proposed.Meanwhile,based on the results of many fields screening tests,the applicable boundary conditions for the new method are also recommended.The results of this paper provide an experimental basis for the application of transient surface wave method in the accurate determination of the earthwork quality.