Test and simulation of influence of voids on tunnel structure safety

doi:10.16265/j.cnki.issn1003-3033.2022.05.1777

Abstract

Abstract:

In order to reduce damage of voids behind lining to tunnel structure, influence of voids on safety of secondary lining structure was studied through changing parameters like number, location and size of voids by using model test and numerical simulation. The results show that safety factor of lining structure is significantly reduced by voids, especially when they exist at the same time in vault, bottom and left and right waist of the arch. Changes in safety factor of arch foot is the most obvious, which decreases by 57%. For cases of two voids at the same time, that at left and right arch waist is most unfavourable to stress of lining structure, featuring the lowest safety factor. When vault void increases from 0° to 45°, the vault bending moment changes from positive to negative, and its safety factor firstly increases and then decreases, during which, it will be the smallest when circumferential angle is 45°, only 34% of that at 15°.

Key words: void, tunnel structure, safety factor, model test, numerical simulation

ZHENG Aichen, XIANG Jinyang, HUANG Feng, JIN Chenghao, LIU Xingchen. Test and simulation of influence of voids on tunnel structure safety[J]. China Safety Science Journal, 2022, 32(5): 119-126.

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类型	γ/ (kN·m^-3)	μ	E/GPa	c/kPa	φ/(°)
围岩	18.6	0.32	0.024	21.3	19.5
衬砌	23.8	0.18	0.96	—	—

方案	工况	空洞位置	空洞大小
1	1	无	长1.2 m, 高0.9 m
	2	左侧拱腰
	3	左拱腰+拱顶 +右拱腰+仰拱
2	4	拱顶+右拱腰
	5	拱顶+左拱脚
	6	左拱腰+右拱腰
3	7	拱顶	环向角度15°	高0.9 m
	8		环向角度30°
	9		环向角度45°

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