School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha, Hunan, China.
Guangxi Xinfazhan Communication Group Co., Ltd, Nanning, Guangxi, China.
PLoS One. 2022 Jul 7;17(7):e0270937. doi: 10.1371/journal.pone.0270937. eCollection 2022.
The purpose of this study is to reveal the response of multi Lane pre disintegrated carbonaceous mudstone embankment under vehicle dynamic load. In this paper, the pre-disintegrated carbonaceous mudstone samples whose fractal dimension meets the requirements are obtained through the indoor disintegration test of carbonaceous mudstone. Geotechnical basic tests such as particle analysis experiments, compaction tests, and direct shear tests were carried out on the pre-disintegrated carbonaceous mudstone samples, and the physical and mechanical parameters of the pre-disintegrated carbonaceous mudstone were obtained. On this basis, a two-way 4-lane pre-disintegration carbonaceous mudstone embankment model of the expressway was established by ABAQUS numerical software. Three different working conditions are set up to study the dynamic response of multi-lane pre-disintegrated carbonaceous mudstone embankment under vehicle load. The results show that the stress change trend on the surface of the pre-disintegrated carbonaceous mudstone embankment without vehicles is the same as that on the side with vehicles. Under this condition, the vertical displacement of the pre-disintegrated carbonaceous mudstone embankment surface can be as high as 4.33mm, and the vertical displacement change of the embankment in the 0-0.6s phase is basically the same as the stress amplitude distribution. When a traffic jam occurs on one side, the maximum increase in vertical stress on the surface of the embankment on the normal driving side is about 170 kPa compared to condition one, and the vertical displacement at each depth of the embankment has been significantly increased. When a traffic jam occurs on one side, it can significantly increase the vertical stress on the surface of the pre-disintegrated carbonaceous mudstone embankment in this lane. The middle part of the stress time curve of monitoring points 3 and 4 in working condition three is more stable and significant than in working condition one, and the maximum vertical displacement is increased by about 1.70mm. The research results can reference the stability analysis of carbonaceous mudstone embankments and engineering practice.
本研究旨在揭示车辆动载作用下多车道预崩解碳质泥岩路堤的响应。本文通过室内崩解试验获得满足分形维数要求的预崩解碳质泥岩样品，对预崩解碳质泥岩样品进行颗粒分析试验、击实试验和直剪试验等土工基本试验，得出预崩解碳质泥岩的物理力学参数。在此基础上，采用 ABAQUS 数值软件建立了双向四车道预崩解碳质泥岩路堤模型，设置了三种不同工况，研究了车辆荷载作用下多车道预崩解碳质泥岩路堤的动力响应。结果表明，无车辆作用下预崩解碳质泥岩路堤表面的应力变化趋势与有车辆作用下的路堤侧相同。在这种情况下，预崩解碳质泥岩路堤表面的垂直位移可达 4.33mm，路堤 0-0.6s 阶段的垂直位移变化与应力幅值分布基本一致。当一侧发生交通堵塞时，与工况一相比，正常行驶侧路堤表面的最大垂直附加应力增加约 170kPa，路堤各深度的垂直位移均明显增大。当一侧发生交通堵塞时，会显著增加该车道预崩解碳质泥岩路堤表面的垂直应力。工况三监测点 3 和 4 的应力时程曲线中部比工况一更稳定、明显，最大垂直位移增加约 1.70mm。研究成果可为碳质泥岩路堤的稳定性分析和工程实践提供参考。
