地层沉陷过程中埋地高密度聚乙烯(HDPE)管道力学行为研究

doi:10.13722/j.cnki.jrme.2017.0230

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Abstract

The failure of buried HDPE pipes may occur as a result of large differential deformation caused by the localized land subsidence. The buried pipe subjected to the land subsidence is commonly analyzed using the theory of beams on Winkler elastic foundation. The theory assumes that the pipe deforms with soil and no separation is expected. However，separation of the pipe and soil may occur due to the stiffness difference and the soil arching effect triggered above the pipe when the land subsidence is developed. Therefore，it is necessary to investigate the possible “pipe-soil separation and performance of the pipe under this condition. In this study，series of large-scale model tests are conducted to investigate the mechanical responses of buried HDPE pipes by using a custom-made model box. Yangtze River sand is used as the backfill. Movable plates installed at the bottom of model box are lowered in target sequences to simulate the land subsidence. Test results show that (1) the vertical displacement of HDPE pipes and settlement trough at the soil surface are well fitted by using the modified Gaussian distribution curves. The width parameters of fitted curves for vertical displacement of HDPE pipes are smaller than those for settlement trough at the soil surface；(2) the earth pressure at the top of the HDPE pipe experiences an overall increase with lowering of bottom plates of the model box. Three-dimensional soil arching effect is observed during the test；(3) the earth pressures measured underneath the pipe reduce to zero with the lowering of the bottom plates. It is indicated that the pipe-soil separation occurs at the bottom of the pipe. It is also found that the vertical displacement and longitudinal bending moment of the HDPE pipe calculated by the theory of beams on Winkler elastic foundation are 1.1 to 9 times and 3 to 11 times those measured in this study，respectively.

Key words： soil mechanics land subsidence HDPE pipe model test earth pressure pipe deformation pipe-soil separation

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	Articles by authors
	ZHOU Min1
	2
	DU Yanjun1
	2
	WANG Fei1
	2
	YOU Quan1
	2
	DONG Dongdong1
	2

Cite this article:

ZHOU Min1,2,DU Yanjun1, et al. Mechanical response of buried HDPE pipes subjected to localized land subsidence[J]. , 2017, 36(S2): 4177-4187.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0230 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/4177

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