带齿格栅加筋挡墙工作机理的数值模拟研究

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摘要 To explore the working mechanism of retaining a wall reinforced with denti-geogrids, the numerical simulation of a pullout test was performed, the working behavior and influencing factors were analyzed, a generalized model was suggested, and an ultimate pullout force calculation formula was proposed. The research obtains the following results. (1) The horizontal displacement of the inner segment of the geogrid is relatively small because of the denti-strips. (2) The displacement gradients of the denti-geogrid are evidently large, whereas the horizontal displacement core is approximately 25 cm outside the denti-strip. The peak value of the horizontal displacement is approximately 3 cm. (3) The pullout force peaks when the denti-strip is approximately 3 m from the lateral boundary. The effective span is extended, and the resistance of the denti-strip increases with denti-strip spacing. Denti-strip height is positively correlated with the pullout force, whereas the influence of thickness is insignificant. (4) The working mechanism of denti-geogrid can be roughly described by three processes, namely, compaction, detour flow, and convergence. (5) The calculation values of the ultimate pullout force obtained from the generalized model are close to the numerical test results. Thus, the applicability of the suggested model was verified.

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	方薇
	陈向阳
	杨果林

关键词 ： road engineering, working behavior, numerical simulation, retaining wall, denti-strip

Abstract：To explore the working mechanism of retaining a wall reinforced with denti-geogrids, the numerical simulation of a pullout test was performed, the working behavior and influencing factors were analyzed, a generalized model was suggested, and an ultimate pullout force calculation formula was proposed. The research obtains the following results. (1) The horizontal displacement of the inner segment of the geogrid is relatively small because of the denti-strips. (2) The displacement gradients of the denti-geogrid are evidently large, whereas the horizontal displacement core is approximately 25 cm outside the denti-strip. The peak value of the horizontal displacement is approximately 3 cm. (3) The pullout force peaks when the denti-strip is approximately 3 m from the lateral boundary. The effective span is extended, and the resistance of the denti-strip increases with denti-strip spacing. Denti-strip height is positively correlated with the pullout force, whereas the influence of thickness is insignificant. (4) The working mechanism of denti-geogrid can be roughly described by three processes, namely, compaction, detour flow, and convergence. (5) The calculation values of the ultimate pullout force obtained from the generalized model are close to the numerical test results. Thus, the applicability of the suggested model was verified.

Key words： road engineering working behavior numerical simulation retaining wall denti-strip

收稿日期: 2016-06-21

基金资助:Supported by the National Natural Science Foundation of China(No.51408059) and Open Fund of Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety,Ministry of Education,China(No.kfj130302)

通讯作者: FANG Wei E-mail: fangwei5642366@163.com

引用本文:

方薇, 陈向阳, 杨果林. 带齿格栅加筋挡墙工作机理的数值模拟研究[J]. Journal of Highway and Transportation Research and Development, 2018, 12(2): 7-13.
FANG Wei, CHEN Xiang-yang, YANG Guo-lin. Numerical Simulation of the Working Mechanism of Denti-geogrid Reinforcement. Journal of Highway and Transportation Research and Development, 2018, 12(2): 7-13.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/ 或 http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/Y2018/V12/I2/7

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