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Assessing subgrade strength using an instrumented dynamic cone penetrometer

机译：使用仪器化的动态锥形渗透仪评估路基强度

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摘要

Subgrade strength is an important aspect to be considered when designing unsurfaced roads and working platforms for pavement structures. Furthermore, dynamic cone penetration tests are used to characterize the subgrade strength. However, the results of dynamic cone penetration tests, including the penetration depth per blow, can be affected by transferred energy and the verticality of the cone penetrometer. The objective of this paper is to characterize the subgrade strength using an instrumented dynamic cone penetrometer (DCP). The instrumented DCP includes a load cell and an accelerometer, located on the cone tip, and measures the dynamic responses of force and velocity over elapsed time. Weathered soil is compacted with three different dry unit weights in a square-shaped container for lab-scale dynamic cone penetration tests. Using instrumented and standard DCPs, several dynamic cone penetration tests are performed, and the dynamic cone penetration index (DCPI) is recorded along the depth profiles. Based on the dynamic responses at the cone tip of the instrumented DCP and the principles of energy conservation, the dynamic cone resistance is suggested as a new strength index. The experimental results show that the dynamic cone resistance increases with the depth of the instrumented DCP, providing a reliable subgrade strength profile in the soil. In addition, the correlation between the DCPI obtained from the instrumented DCP and the dynamic cone resistance suggests that the dynamic cone resistance is more sensitive than the DCPI for stiff soil. Based on the correlation values of the dynamic cone resistance obtained from the instrumented DCP, the internal friction angle and California bearing ratio values can be estimated with a high degree of reliability. This study demonstrates that use of the instrumented DCP may be a promising in situ testing method for the reliable characterization of subgrade strength. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：在设计路面结构的无路面道路和工作平台时，路基强度是要考虑的重要方面。此外，动态锥入度测试用于表征路基强度。但是，动态锥体穿透测试的结果（包括每次打击的穿透深度）可能会受到传递的能量和锥体硬度计垂直度的影响。本文的目的是使用仪器化的动态锥形透度计（DCP）表征路基强度。装有仪器的DCP包括位于锥体尖端的称重传感器和加速度计，并测量经过时间的力和速度的动态响应。风化的土壤在一个方形容器中用三种不同的干燥单位重量压实，用于实验室规模的动态锥体渗透测试。使用仪器化的和标准的DCP，执行了几个动态锥入度测试，并沿深度剖面记录了动态锥入度指数（DCPI）。基于所测量的DCP锥尖处的动态响应和节能原理，建议将动态锥电阻作为新的强度指标。实验结果表明，动态锥阻随所装DCP的深度而增加，从而在土壤中提供可靠的路基强度分布。此外，从已测量的DCP获得的DCPI与动态锥阻之间的相关性表明，对于坚硬的土壤，动态锥阻比DCPI更为敏感。基于从已安装的DCP获得的动锥阻力的相关值，可以高度可靠地估算内摩擦角和加利福尼亚轴承比值。这项研究表明，使用仪器化DCP可能是一种可靠的路基强度表征方法。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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