列车荷载作用下纤维混凝土材料隧道衬砌受不同裂缝特征影响的结构稳定性分析

doi:10.13722/j.cnki.jrme.2020.0875

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Abstract The three different damage parameters for fiber concrete are determined for theoretical researches based on the fiber concrete tests with the digital image correlation(DIC) technology，and the mechanics model for surrounding rock-tunnel structure is also obtained. On the basis of the finite element displacement method expressed by stress intensity and stability factor with analytical solution，the influences of different crack location，depth，width，angle，surrounding rock grades on the structural stability of lining cracks are analyzed under the cases of conventional concrete and different types of fiber concrete for secondary lining. The results show that lining cracks are subjected the compression and shear stress under the train excitation loads. Compared with the conventional concrete，the fiber concrete can effectively enhance the structural stability of the cracked lining，and reduce the stress concentration at crack tip during the dynamic loads of train. Among them，the glass fiber concrete has the strongest reduction effect，the mixed fiber is the second，and the PVA fiber is the weakest. Furthermore，the influence of cracks from arch foot to arch roof on the stability of lining structure tends to climb status，and compared with the crack width，the crack depth and inclination angle are more obvious for the effect of stability of lining structure under train loads. For the case of the inclination angle = 45°for crack in arch roof of lining tunnel，the stability of lining structure is weakest. Taking = 45°as the dividing line，the area of is more dangerous than the area of ，and the danger increases with the increase of train speed. Moreover，when the rock around the tunnel is grade V with low strength，the reinforced effect of fiber concrete on the structural stability is greatly reduced. At this moment，even if the depth of crack in arch roof of tunnel lining is very small，the tunnel lining structure also will enter a dangerous status，so special attention should be paid to the repair of such cracks in the engineering practice.

Key words： tunnelling engineering tunnel lining train load fiber concrete tests finite element displacement method stability factor

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	Articles by authors
	ZHANG Zhiguo1
	2
	3
	ZHANG Mengxi2
	FENG Ju1
	MA Weibin3
	WANG Zhiwei3
	CHENG Zhixiang1

Cite this article:

ZHANG Zhiguo1,2,3, et al. Analyses on structural stability of fiber concrete tunnel lining considering different characteristics of cracks under train loads[J]. , 2022, 41(S1): 2927-2943.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0875 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2927

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