深埋隧道复合式衬砌承载规律及其力学解答

doi:10.13722/j.cnki.jrme.2020.0777

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Abstract In order to study distribution rules and formational reasons of loads on composite linings in deep-buried tunnels，firstly，the contact loads between the surrounding rock and the primary support as well as between the primary support and the secondary lining，monitored in 52 tunnels，were counted，and the load distribution range of each monitoring point and the load sharing ratio of the secondary lining were analyzed. Secondly，by equating BQ to GSI，a theoretical method for calculating the support load was developed based on the Hoek-Brown strength criterion. Finally，the theoretical method was compared with the monitoring data to verify its feasibility，and the important factors affecting the support load and the main load-bearing structure were analyzed. The analysis results show that there is a certain difference in the tunnel support loads for different surrounding rock grades，and that the lower the surrounding rock grade，the greater load sharing ratio of the secondary lining will be. The corresponding intervals of the GSI for classes I，II，III，IV，and V of the surrounding rock are 100–78，77–62，61–48，47–36 and 35–10，respectively. The theoretical calculation is more suitable for the burial depth greater than 100 m，and for the burial depth less than 100 m，some of soft surrounding rock section loads are reflected as loose loads. The load sharing ratio of the secondary lining of classes III，IV and V surrounding rock ranges from 17.43% to 37.96%，from 27.42% to 51.89% and from 37.52% to 66.6%，respectively. The installation time of the secondary lining，the support thickness and the surrounding rock conditions have great influence on the support loads，and the combination of these factors can change the main load-bearing structure. The research results provide some reference for the design of deep-buried tunnel support in mountains.

Key words： tunnelling engineering deep-buried tunnel composite lining load GSI main load-bearing structure

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	ZHOU Jian1
	YANG Xin′an1
	CAI Jian2
	YANG Fan2

Cite this article:

ZHOU Jian1,YANG Xin′an1,CAI Jian2, et al. Distribution rules and mechanical solutions of loads on composite linings in deep-buried tunnels[J]. , 2021, 40(5): 1009-1021.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0777 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/1009

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