软弱破碎围岩地层预应力管–索结构的提出及应用

doi:10.13722/j.cnki.jrme.2023.1079

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Abstract In order to reduce the deformation of tunnels located in broken surrounding rock with high ground stresses，the advantages and disadvantages of different types of bolts(cables) are analyzed. Combined with model test，a new type of prestressed pipe-cable(PPC) structure for tunnels is developed. This study introduces the bearing mechanism of the new developed PPC structure and sets up a coupling mechanical bearing model based on the PPC structure by theoretical analysis. Furthermore，the bearing effect of PPC structure is systematically analyzed. Finally，the reliability of the new structure is verified by field test. The research results indicate that the PPC structure can reinforcement the rockmass by grouting and forming a bearing structure. More importantly，the PPC structure can amplify support capacity. The PPC structure，it is important to adopt grout to improve the mechanical parameters of surrounding rockmass，but adjusting the row spacing between adjacent PPC to improve the bearing capacity of surrounding rock is more direct and efficient. Further analysis indicate that the reasonable thickness b1 of the shallow prestressed body is about 0.8 times of the tunnel radius r0，and the reasonable thickness b2 of the deep prestressed body is 1.44 times of tunnel radius，which can provide theoretical basis for the parameter design of the PPC. The field test shows that the prestressed pipe-cable support can effectively improve the stability of soft and broken surrounding rock，and can provide reference for similar projects.

Key words： tunnel engineering weak and broken surrounding rock pipe-cable structure deep-shallow prestressed body bearing enhancement factor engineering application

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	Articles by authors
	YU Tao
	LUO Hu
	JIANG Yifan
	YAO Zhigang
	LI Mengke
	FANG Yong

Cite this article:

YU Tao,LUO Hu,JIANG Yifan, et al. Prestressed pipe-cable support structure in weak broken surrounding rock stratum and its application[J]. , 2024, 43(6): 1505-1518.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1079 OR http://rockmech.whrsm.ac.cn/EN/Y2024/V43/I6/1505

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