泥岩大变形隧洞缓冲层让压支护应用研究

doi:10.13722/j.cnki.jrme.2022.0496

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Abstract When tunnelling in soft rock under high in-situ stress，obvious time-dependent deformation of surrounding rock is often observed，and the deformation can cause serious damage and cracking of the secondary lining. To reduce the ground pressure of the secondary lining induced by time-dependent deformation，a compressible layer is suggested to construct between the primary support and secondary lining. Filling material of the compressible layer should have high compression capability to absorb the time-dependent deformation. In this study，the yielding support used polyethylene foam(density is 90–100 kg/m3) compressible layer and U steel ribs was applied in a tunnel excavated in sandy mudstone and glutenite in northwest China. According to the field observations and numerical results，the performances of the yielding support were analyzed. The results showed that because U steel ribs were connected by the friction connections，the maximum monitoring stress of the U steel ribs is only 140 MPa，which was much lower than that of the H steel ribs. The polyethylene foam layer has great compression capability，and can absorb the time-dependent deformation of the surrounding rock efficiently. According to the monitoring results，the maximum circumferential compression stress of the secondary lining was 13.0 MPa with average value 6.2 MPa，which is lower than the design compression strength of the secondary，indicates the high performance of the compressible layer.

Key words： tunnelling engineering large deformation compressible layer field application tunnel support

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	Articles by authors
	TIAN Hongming1
	SHU Xiaoyun1
	2
	CHEN Weizhong1
	TAN Xianjun1
	CHI Jianjun3

Cite this article:

TIAN Hongming1,SHU Xiaoyun1,2, et al. Field application of the yielding support used compressible layer in a tunnel excavated in mudstone[J]. , 2023, 42(S2): 4121-4129.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0496 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4121

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