考虑分部开挖的超大跨度公路隧道围岩压力计算方法研究

doi:10.13722/j.cnki.jrme.2021.1337

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Abstract To propose a new surrounding rock pressure calculation method for super-large-span highway tunnels，based on the construction mechanics theory of adjacent tunnels，this paper studied the influence between the surrounding rock pressures of each pilot tunnel excavated in sequence，and analyzed the interaction mechanism of each pilot tunnel excavated in sequence. By selecting 5 typical highway tunnels with four lanes in a single hole at three different regions，the monitoring data of surrounding rock pressure of 18 cross-sections of grade III，IV and V rock mass constructed by upper-lower bench method and upper-bench CD method were obtained，and it was found that the surrounding rock pressure of the rear pilot tunnel was generally affected by the excavation of the first pilot tunnel，and the pilot tunnel influence coefficient was proposed to quantitatively analyze the influence of the first pilot tunnel excavation on the surrounding rock pressure of the rear pilot tunnel. Then，the variation rate of the surrounding rock pressure in the current tunnel code was modified，and finally a calculation method of the surrounding rock pressure of the super-large-span tunnel considering the sequential excavation was proposed. The results show that：(1) The parallel(left and right) tunnels have a significant impact on the peripheral stress，while the overlapping(upper and lower) tunnels have limited impact on the peripheral stress. The combined impact of the left and right parallel pilot tunnel excavation on the surrounding rock pressure should be considered；(2) The influence coefficient of the pilot tunnel is mainly greater than 1，and the average values of Grade IV and V surrounding rock are 1.12 and 1.28 respectively；(3) Based on the current tunnel standard，the revised variation rate of the surrounding rock pressure was proposed，which is = 0.017(S－1)；(4) Compared with the calculation method of the surrounding rock pressure in the current tunnel standard，the Grade-IV and Grade-V surrounding rock pressures calculated by the proposed method in this paper are reduced by 14.6% and 2.4% respectively，which are closer to the measured values.

Key words： tunnelling engineering super-large-span highway tunnel surrounding rock mass pressure sequential excavation method influence coefficient of pilot tunnel

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	LUO Yanbin
	DONG Fangfang
	WANG Chuanwu
	CHEN Jianxun
	ZHU Tantan
	ZHANG Lixin
	LIU Weiwei

Cite this article:

LUO Yanbin,DONG Fangfang,WANG Chuanwu, et al. A surrounding rock pressure calculation method for super-large-span highway tunnels considering sequential excavation[J]. , 2022, 41(8): 1637-1646.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1337 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I8/1637

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