School of Highway, Chang'an University, Xi'an 710064, China.
School of Science, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Sensors (Basel). 2020 Jul 31;20(15):4288. doi: 10.3390/s20154288.
Hydraulic compactor is an efficient reinforcement machine for loess subgrade. However, it is difficult to control the layered compaction quality of the subgrade. This research presents a real-time layered compactness monitoring method for hydraulic compactor reinforcement of subgrade in loess areas. The hydraulic force coefficient is first introduced, and the dynamic response model of the hydraulic rammer and soil is established. The relationship between the acceleration of the hydraulic rammer and the compactness of subgrade is then obtained based on the collision theory in elastic half space. A full-scale test using a hydraulic compactor to reinforce loess subgrade was also carried out. Results show that the hydraulic compactor obtains the effective influence depth for the reinforcement of loess subgrade. Within the effective reinforcement depth, the relationship between the peak acceleration of the rammer and the layered compactness of subgrade can be well fitted by a quadratic function model. The layered compactness of the subgrade and the working state of the hydraulic compactor can then be remotely monitored at a mobile terminal in real time. Furthermore, the monitoring technology was applied to Huangling-Yan'an Expressway in China, significantly improving the accuracy and efficiency of real-time monitoring of the layered compactness of subgrade in the loess area.
液压夯实机是黄土路基的高效加固机械。然而，对于路基的分层压实质量很难进行控制。本研究提出了一种黄土地区液压夯实机加固路基的实时分层密实度监测方法。首先引入液压系数，建立了夯实机与土壤的动力响应模型。然后基于弹性半空间中的碰撞理论，得到了夯实机加速度与路基密实度之间的关系。还进行了使用液压夯实机加固黄土路基的现场试验。结果表明，液压夯实机获得了黄土路基加固的有效影响深度。在有效加固深度范围内，夯实机的峰值加速度与路基分层密实度之间的关系可以很好地用二次函数模型拟合。然后可以在移动终端上实时远程监测路基的分层密实度和液压夯实机的工作状态。此外，该监测技术应用于中国的黄陵-延安高速公路，显著提高了黄土地区路基分层密实度实时监测的准确性和效率。
