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| Numerical Simulation of Geogrid-reinforced Flexible Support for Treating Expansive Soil Cut Slopes |
| XIAO Jie, LIU Hai-peng, YANG He-ping |
| Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education, Changsha University of Science & Technology, Changsha Hunan, 410114, China |
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Abstract The influence of various interface strength parameters, different reinforcement spacing, and type of slope (enveloped or not) with a geogrid on flexible-support-reinforced expansive soil cut slopes was investigated by numerical simulation. The simulation considered the attenuation of the shear strength of expansive soil due to rainfall, evaporation, and other long-term atmospheric weathering actions in combination with shear strength parameters determined by a laboratory-measured expansive soil nonlinear strength envelope. Results showed that the geogrid can effectively restrain horizontal slope displacement and decrease the soil expansion softening effect to a certain extent, such that the sliding surface of the slope became deep. The change in maximum axial force was small due to a change in interface strength parameters between the geogrid and soil, but the safety factor increased with the increase in maximum axial force. The changes in maximum axial force along the height for different geogrid reinforcement spacing values were basically similar; the values increased initially and then decreased. Small reinforcement spacing equated to a small maximum value. The stability of the expansive soil slope was significantly influenced by reinforcement spacing; small spacing meant good slope stability. The enveloped geogrid indirectly improved the safety, resistance to erosion, and integrity of the slope.
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Received: 09 February 2015
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| Fund:Supported by the National Natural Science Foundation of China (51608053); Natural Science Foundation of Hunan Province (2017JJ3335); Open Fund of State Engineering Laboratory of Highway Maintenance Technology (Changsha University of Science & Technology) (kfj150103); Open Fund of Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education (Changsha University of Science & Technology) (kfj20160401); the Scientific Research Fund of Hunan Provincial Education Department (15C0043). |
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Corresponding Authors:
XIAO Jie
E-mail: xiaojie324@csust.edu.cn
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[1] LIAO Shi-wen. Expansive Soil and Railway Engineering[M]. Beijing:China Railway Publishing House, 1984. (in Chinese)
[2] LI Sheng-lin, QIN Su-juan, BO Zun-zhao, et al. Chinese Expansive Soil Engineering Geological Studies[M]. Nanjing:Jiangsu Science and Technology Publishing House, 1992. (in Chinese)
[3] QU Yong-xin, ZHANG Yong-shuang, YANG Jun-feng, et al. Theory and Practice of Classification of Rock Soil Engineering Geology, the Integration of the Expansion Chinese[C]//Fifty Years for Chinese Engineering Geology. Beijing:Seismological Press, 2000:140-164. (in Chinese)
[4] QU Yong-xin, FENG Yu-yong, ZHANG Yong-shuang. Discuss on Some Basic Problems in Studying the Expansive Rock (soil) of Nanning Kunming Railway[R]. Beijing:Chinese Geological Scientific Research Institute of Geological Engineering Center, 2002. (in Chinese)
[5] YANG He-ping, ZHENG Peng. Geological Investigation and Reflection on the Expansive Soil in Nanning-Youyiguan Highway[J]. Journal of Changsha University of Science and Technology:Natural Science, 2004, 1(1):14-19. (in Chinese)
[6] XU Han, WANG Min-yuan, HUANG Bin, et al. Numerical Simulation Research on Canal Slope of Expansive Soil Strengthened by Geogrid[J]. Rock and Soil Mechanics, 2007, 28(S1):599-603. (in Chinese)
[7] CAI Jian-tao, WANG Min-yuan, ZHOU Xiao-wen, et al. Analysis of Expansive Soil Slope Stability Reinforced by Geogrid under the Condition of Moisture Absorption[J]. Yangtze River, 2008, 39(11):84-88. (in Chinese)
[8] JING Jin-hua. Research on Failure Mechanism of Shallow Instability of Expansive Soil Slope and Geogrid-confined Effect on Swelling Deformation[D]. Zhejiang University, 2014. (in Chinese)
[9] XIAO Jie, YANG He-ping, FU Hao, et al. Comparison Model Test on Effect of Geogrid Reinforcement for Expansive Soil Slope[J]. China Journal of Highway and Transport, 2014, 27(7):24-31. (in Chinese)
[10] XIAO Jie, YANG He-ping, WANG Xing-zheng, et al. Analysis of Nonlinear Characteristics of Shear Strength of Nanning Expansive Soil and Its Influencing Factors[J]. China Journal of Highway and Transport, 2014, 27(10):1-8. (in Chinese)
[11] LADE P V. The Mechanics of Surficial Failure in Soil Slopes[J]. Engineering Geology, 2010, 114:57-64.
[12] MIAO Xie-xing, YANG Cheng-yong, CHEN Zhi-da. Humidity Stress Field Theory in Swelling Rock Mass[J]. Rock and Soil Mechanics, 1993, 14(4):49-55. (in Chinese)
[13] CHENG Bin. Numerical Simulation Analysis on Stability of Turnup Geogrid Flexible Supporting Expansive Soil Slope[D]. Changsha:Changsha University of Science and Technology, 2012:30-32. (in Chinese) |
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2017, Vol. 11 
