卸荷作用对超大断面隧道围岩压力的影响

doi:10.13722/j.cnki.jrme.2019.0835

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Abstract During the excavation by steps of super large-section tunnel，the stress of surrounding rock changes correspondingly，and each step of excavation has different impacts on rock mass. Based on the theory of unloading rock mass mechanics，the different unloading zone and the quality deterioration of surrounding rock are constantly changing in tunnel construction. Combined with double side heading construction of a super large-section tunnel in Guanshui Road station of Guiyang Metro Line 2，the effect of unloading on the depth of pressure arch of super large-section tunnel was analyzed by numerical simulation and theoretical analysis. The unloading effect coefficient was introduced to improve the existing method for calculating the process load of tunnel，and the results were compared with those of the calculation method of process load of existing tunnel and the recommended calculation method of highway tunnel. Comparing with the back analysis and calculation results of surrounding rock pressure based on field displacement monitoring data，the calculation results of the improved method were basically consistent with that，and it shows the method had high accuracy.

Key words： tunnel engineering super large-section excavation by steps unloading effect surrounding rock pressure

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	Articles by authors
	CAO Zhilin1
	XIE Qiang1
	SONG Zhanping2
	3
	WANG Junbao2
	3

Cite this article:

CAO Zhilin1,XIE Qiang1,SONG Zhanping2, et al. Effect of unloading on surrounding rock pressure of super large-section tunnel[J]. , 2020, 39(S1): 2882-2891.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0835 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/2882

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