基于连续压实控制技术的路基压实均匀性评价

来源期刊:中南大学学报(自然科学版)2021年第7期

论文作者:曹丽萍 周杰 李涛 陈凤晨 董泽蛟

文章页码:2200 - 2211

关键词:路基压实;连续压实控制技术;均匀性;评价方法

Key words:subgrade compaction; continuous compaction control technology; uniformity; evaluation method

摘    要:针对连续压实控制技术在路基压实均匀性评价方面的不足,通过现场连续压实试验,首先建立连续压实指标压实计值与常规检测指标压实度之间的相关关系,然后基于有限元模拟,分析不同压实度下道路结构力学指标的变化,最后提出以区域均匀性控制指标δ以及纵向条带一致性统计量k和横向条带一致性统计量h作为路基压实均匀性评价指标。研究结果表明:压实计值与压实度具有较好的线性相关性,可以利用关系方程进行相应的数值转换。相较而言,路基压实度变化对路基顶面压应变的影响最大,结合实际工程验收情况,确定压实度差异程度的容许值为2%。根据提出的压实均匀性评价方法可以从平行和垂直于碾压轨迹的2个方向上进行压实均匀性的评价,并根据评价结果能快速定位存在压实不均匀现象的区域或条带。

Abstract: With the aim to solve the deficiencies of continuous compaction control technology in subgrade compaction uniformity evaluation, an on-site continuous compaction test was carried out. At first, the correlation between compaction meter value, a continuous compaction indicator, and compactness, a traditional index, was established, and then the variation of road structure mechanics indicators with the compactness of subgrade was analyzed on the basis of finite element simulation. Finally, regional uniformity control index δ, longitudinal strip consistency statistic k, and transverse strip consistency statistic h were proposed as the evaluation indicators for subgrade compaction uniformity. The results show that there is a good linear correlation between compaction meter value and compactness, and so the fitting equation can be used to conduct the conversion between both indicators. In comparison, the change of subgrade compactness has a more conspicuous influence on the compressive strain of the top surface of subgrade. Combined with the actual project acceptance, 2% is determined to be the critical value for compactness difference. According to the method proposed in this investigation, the compaction uniformity can be assessed in directions parallel and perpendicular to the rolling path and the regions and strips with nonuniform compaction can be quickly located.

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