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首页> 外文期刊>Canadian Geotechnical Journal >Analysis of center of gravity roller drum soil stiffness on compacted layered earthwork
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Analysis of center of gravity roller drum soil stiffness on compacted layered earthwork

机译：重夯土层上重心滚筒土壤刚度分析

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摘要

This paper describes the interpretation of intelligent compaction (IC) data from two layered soil test beds using center of gravity (CG) roller-measured soil stiffness. Conventional edge-mounted (EM) roller-measured soil stiffness values are interpreted from vertical accelerations measured by discrete, single-position accelerometers. However, these EM accelerometers are located at variable distances from the drum CG; the resulting vertical accelerations are thus affected by the rotation of the roller drum about the drum CG in the direction of roller travel. This leads to undesirable measurement artifacts, specifically multiple possible soil stiffness values for one soil location and an artificial dependence of the soil stiffness values on the direction of roller travel. In this study, left and right EM acceleration data from a vibratory roller are used to compute vertical accelerations at the CG of the roller drum. These vertical accelerations are used to compute CG stiffness values, which are not subject to the measurement artifacts associated with EM stiffness values. The resulting CG stiffness values are used to interpret IC data from two test beds with multiple 15-30 cm thick base-subbase-subgrade lifts. CG soil stiffness increases with the addition of subbase and base lifts, showing a desired sensitivity to changes in soil materials. CG stiffness also increases with the addition of multiple base lifts, showing a desired sensitivity to an increase in the overall thickness of the base material. This study demonstrates the efficacy of this unambiguous measure of soil stiffness for practical usage in IC of layered earthwork systems.
机译：本文介绍了使用重心（CG）辊测土壤刚度从两层土壤试验床中获得智能压实（IC）数据的方法。常规的边缘安装（EM）滚筒测量的土壤刚度值由离散的单位置加速度计测量的垂直加速度解释。但是，这些EM加速度计与鼓CG的距离不同。因此，由此产生的垂直加速度受到辊筒在辊子行进方向上围绕辊筒CG的旋转的影响。这导致不期望的测量伪影，特别是对于一个土壤位置的多个可能的土壤刚度值，以及土壤刚度值在压路机行进方向上的人为依赖。在这项研究中，来自振动辊的左右EM加速度数据用于计算辊筒CG处的垂直加速度。这些垂直加速度用于计算CG刚度值，该值不受与EM刚度值关联的测量伪像的影响。所得的CG刚度值用于解释来自具有多个15-30 cm厚的基层-基层-路基举升的两个试验台的IC数据。 CG的土壤刚度随着增加的基础和基础提升而增加，显示出对土壤材料变化的期望敏感性。 CG刚度也随着增加多个基础提升而增加，显示出对基础材料整体厚度增加的期望敏感性。这项研究证明了这种明确的土壤刚度测量方法在分层土方系统IC中的实际应用的功效。

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