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The finite element method is used for numerical simulation analysis to explore the settlement characteristics of widened subgrade under the influence of different working conditions and factors. The research results show that at the end of the construction period, the maximum total settlement of the subgrade surface of the project of simultaneous widening and raising of the original subgrade is 1.97 cm, the maximum differential settlement of the subgrade surface is 0.21 cm, and the cross slope of the road arch increases by 1.4%. The maximum total settlement of the subgrade surface of the project of only widening of the original subgrade is 2.35 cm, which is an increase of 19.3% compared with the maximum total settlement of the subgrade surface of the project of simultaneous widening and raising of the original subgrade. The total settlement of the subgrade surface under the two working conditions varies with the change of filling materials and increases with the width, height, and slope ratio. When the width increases from 3.5 to 14 m, the maximum uncoordinated deformation of the subgrade surface of the project of simultaneous widening and raising of the original subgrade is increased from 0.54 to 1.31 cm, and the value of the subgrade surface settlement curvature of the splicing area for the project of only widening of the original subgrade is increased from 0.13 to 0.97. The obtained results can provide a reference for subgrade widening projects in the future.
filling materials, heights, settlement working condition differences, slope ratios, widened widths
[1] Zhen, F., Xuancang, W. & Xingguang, C., Influence of expressway widening method on differential settlement of subgrade. Subgrade Engineering, (04), pp. 22–23, 2009. https://doi.org/10.1109/mace.2010.5536446
[2] Hongying, F., Xuesen, S., Hanliang, B., Kun, D. & Liuhui, Z., Influence of widening modes on subgrade settlement of expressway. Journal of Traffic and Transportation Engineering, 12(1), pp. 13–18+37, 2012.
[3] Longqian, Z., Influence of expressway widening method on subgrade settlement. Transpoworld, 7, pp. 18–19, 2019. https://doi.org/10.1088/1755-1315/565/1/012107
[4] Jiangtao, D., Analysis of the influence of expressway widening method on subgrade settlement. Transpoworld, 2, pp. 24–25, 2016. https://doi.org/10.4028/www.scientific.net/amr.717.290
[5] Tan, Z., Youyun, L., Jideng, X., Zhanrui, L. & Kewen, L., Research on characteristics of uneven settlement of subgrade under different widening methods. Highways & Automotive Applications, 2, pp. 86–90, 2020.
[6] Aurangzeb., Analysis on the way and its characteristics of road base widening in expressway widening project. International Journal of Civil Engineering and Machinery Manufacture, 1(2), 2016.
[7] Sonja, G.-K., Review on the ways and characteristics of expressway subgrade widening. International Journal of Intelligent Information and Management Science, 5(3), 2016.
[8] Zhen, F., Xuancang, W., Xingguang, C., Hongzhi, L., Jianping, S. & Lei, W., Differential settlement characteristics and influencing factors of widening subgrade. Journal of Traffic and Transportation Engineering, 1, pp. 54–57, 2007.
[9] Haiyang, Y., Finite element analysis of inconsistent deformation characteristics of new and original subgrade under different engineering conditions. Urban Roads Bridges & Flood Control, 1, pp. 116–119+12, 2014.
[10] Yang, J., Xiaomou, W. & Yuanxin, H., Analysis of inconsistent deformation characteristics of new and original subgrade under different widening conditions. Journal of China & Foreign Highway, 30(5), pp. 46–50, 2010.
[11] Guoyin, S. & Xiuzhong, L., Numerical simulation of differential settlement between new and existing embankment in widening of expressway. Highway, 9, pp. 9–14, 2012. https://doi.org/10.1061/9780784413159.305
[12] Junhui, Z., Houming, W. & Ping, Z., Widening subgrade differential settlement monitoring and numerical analysis. Journal of Transport Science and Engineering, 36(1), pp. 14–19, 2020. https://doi.org/10.12677/hjce.2020.96065
[13] Jingshan, J., Deformation behavior of highway widened on soft clay ground considering the interaction between new subgrade and original subgrade. Journal of Yangtze River Scientific Research Institute, 29(5), pp. 32–39, 2012.
[14] Jianlei, L. & Lei, N., Analysis of differential settlement of the widened roadbed of an original highway. Railway Engineering, 11, pp. 49–51, 2008.
[15] Chenzhu, W., Analysis and countermeasure explore for characteristics of differential subgrade settlement of mountain expressway. Journal of Shandong Agricultural University (Natural Science Edition), 49(5), pp. 772–776, 2018.
[16] Zhenzi, Y., Analysis and control of differential settlement during widening and heightening of highway roadbed in mountain area. Technology of Highway and Transport, 34(6), pp. 5–7+12, 2018.
[17] Zhengshun, J. & Zhilong, G., Analysis of uneven settlement and influencing factors of steep slope at Nairobi-Malabar Railway. Journal of Hunan University (Natural Sciences), 45(S1), pp. 25–29, 2018.
[18] Jianjie, W., Analysis of main factors influencing on differential settlement of widening subgrade. Transportation Technology of Shandong Province, 6, pp. 62–64, 2013.
[19] Baoxin, J., Fengpu, L., Liang, Z., Linli, Z. & Zhiyong, L., Influential factors analysis of the new and original roadbed on the differential settlements due to the highway reconstruction and extension. Journal of Safety and Environment, 20(1), pp. 67–72, 2020.
[20] Jinlong, L., Yong, Z., Luwang, C. & Jili, W., Basic characters of road widening engineering. Rock and Soil Mechanics, 31(7), pp. 2159–2163, 2010.
[21] Tianyu, Z. & Jinxiu, L., Research on influencing factors of differential settlement of highway widened roadbed. Highways & Transportation in Inner Mongolia, 4, pp. 6–8+23, 2020.
[22] Zhen, F., Xuancang, W., Xingguang, C., Hongzhi, L., Jianping, S. & Lei, W., Influence of different consolidation degree of new and original ground on differential settlement in widening embankment. Highway, 5, pp. 9–12, 2008.
[23] Fayu, W., Analysis of differential settlement of new and original roadbed in expressway widening project. Journal of China & Foreign Highway, 31(5), pp. 43–45, 2011.
[24] Mingjian, W., Numerical analysis and control of settlement difference in roadbed widening project. Urban Roads Bridges & Flood Control, 8, pp. 43–46+8, 2016.
[25] Baolin, X., Guangqing, Y. & Xinshan, W. Settlement analysis of widening subgrade in the highway considering technology parameter of composite foundation. International Journal of Earth Sciences and Engineering, 9(4), 2016.
[26] Yaming, L., Numerical analysis of uneven settlement of subgrade widening. Chinese & Overseas Architecture, 8, pp. 244–247, 2017.
[27] Heng, Y., Yimin, W., Chao, Z., Peng, W. & Cen, Y., Study on subgrade settlement characteristics after widening project of highway built on weak foundation. Arabian Journal for Science and Engineering, 42(9), 2017.
[28] Yuyan, W., Analysis of control measures for settlement of differences on the problems of highway subgrade widening. Open Journal of Civil Engineering, 5(2), 2015.
[29] Tao, Y., Yizhou, R., Wenyan, Z. & Guowei, L., Numerical analysis of deformation behavior of highway widening engineering with new fill on original subgrade. Journal of Highway and Transportation Research and Development, 30(7), pp. 35–39, 2013.
[30] Xiaoli, S., Yuhai, S. & Xia, C., Research on key issues of subgrade design for reconstruction and expansion project of Bin-Lai Expressway. Transportation Technology of Shandong Province, (01), pp. 97–99, 2017.
[31] Jianrong, Y., Xiaoqiang, C., Feng, L. & Yafei, H., Study on subgrade settlement characteristics and the influencing factors by lengthwise heightening and widening in road reconstruction and extension. Subgrade Engineering, (05), pp. 35–39, 2019.
[32] Lixiao, Z., Research on influence of differential settlement of widening subgrade on semi-rigid asphalt pavement. Northeast Forestry University, 2014.
[33] Lin, Y., Study on deformation property and stability technique of widened embankment of high-grade highway. Jilin University, 2007.