软岩隧道拱脚沉降的主动控制理念与技术实现

doi:10.3724/1000-6915.jrme.2024.0860

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Abstract The arch foot of the initial support is a crucial component in the deformation control during the sequential excavation of soft rock tunnels. To address the issue of foot settlement control in the upper step of soft rock tunnels, this study first analyzed the settlement deformation mechanism of the arch foot and proposed an active control concept for foot settlement. Subsequently, the use of small-diameter prestressed feet-lock cables was suggested to control foot settlement. A second-generation support structure, combining steel-rib, steel mesh, shotcrete, and feet-lock pipes (cables) with both active and passive support functions, was established. The advantages of small-diameter prestressed feet-lock cables over traditional feet-lock pipes (bolts) were analyzed. Field tests verified the effectiveness of small-diameter prestressed feet-lock cables in controlling foot settlement of the initial support, and potential challenges in their future application were discussed comprehensively. The results indicated that: (1) The systematic bolts were generally short and ineffective in soft rock tunnels, leading to fewer installations and more focus on tunnel feet-lock pipes (bolts). (2) The upper step of the tunnel had limited space, making it difficult to install large-diameter feet-lock pipes, and increasing the number of small-diameter feet-lock pipes had limited control effect on foot settlement. (3) Small-diameter prestressed feet-lock cables provide suspension and active support functions for the arch foot of the initial support, offering significant advantages over feet-lock pipes (bolts) which rely on transverse bending stiffness to resist foot settlement deformation. (4) Prestressed feet-lock cables can also control foot convergence deformation of the initial support by adjusting installation angles and positions, showing promising application potential. (5) Foot deformation in sequential excavation of soft rock tunnels is persistent and sudden. For high strength and toughness structures, the concept of a third-generation support structure combining steel-rib, steel mesh, shotcrete, and feet-lock pipes (cables) is proposed, providing a direction for future research.

Key words： tunnel engineering soft rock arch foot settlement prestressed feet-lock cable active support

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	CHEN Lijun
	CHEN Jianxun
	GUO Huijie
	ZHANG Lixin
	SUN Pengfei
	LUO Hua

Cite this article:

CHEN Lijun,CHEN Jianxun,GUO Huijie, et al. The concept and technological implementation of active control for foot settlement of soft rock tunnels[J]. , 2025, 44(6): 1466-1480.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0860 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1466

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