透明黏土盾构隧道开挖面失稳扩展过程和失稳特征研究

doi:10.13722/j.cnki.jrme.2021.0790

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Abstract A series of shield tunnel face instability model tests using transparent clay were conducted to investigate the instability process and characteristics of the excavation face. It was verified that the transparent clay could be used for the experimental researches in shield tunnel face instability. The instability evolution process of the excavation face of shield tunnels was studied based on the soil movement under different cover depths to diameter ratios. The characteristics of staged collapse process，influencing zone and shape of the excavation face instability as well as the change of the surface settlement were discovered. In addition，the surface settlement under different collapse stages was studied. The nature of the excavation face instability is a gradual process of soil movement which can be described as three stages. The loosened clays in front of the tunnel face slipps into the tunnel vertically downward at an angle together with those in the upper portion in the initial deformational stage. The surrounding clays are disturbed and loosed continuously and the extent of the soil movement increases in the deformational-extended stage. The clays slipp rapidly and the overall face instability occurs in the collapse stage. The zoning characteristics refers to that the influencing zone of the face instability consists of the collapse zone caused by the overall clay collapse and the disturbed zone in which the clays exhibit obvious movement. A determination criterion of the collapse zone was proposed. The clays in the collapse zone flow into the shield tunnel in the longitudinal section and have an oval shape in the cross-section during the collapse stage. The traditional logarithmic spiral and Torus model contours fit well in the lower portion of the collapse zone but deviate in the upper portion of the collapse zone. The surface settlement in the cross-section conforms to the Gaussian settlement curve in the initial deformational stage and deformational-extended stage but deviates from the Gaussian settlement curve in the collapse stage.

Key words： soil mechanics transparent soil shield tunnel face instability face instability process；surface settlement

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	LEI Huayang1
	2
	LIU Min1
	CHENG Zeyu1
	ZHONG Haichen1

Cite this article:

LEI Huayang1,2,LIU Min1, et al. Instability process and characteristics of the excavation face of shield tunnels using transparent clays[J]. , 2022, 41(6): 1235-1245.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0790 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1235

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