走滑型断裂破坏模式及隧道工程对策

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Abstract Research purposes: A 6.9 magnitude earthquake with an intensity of 9 degrees occurred in Menyuan County, Qinghai Province on 8 January 2022, which caused severe damage to the Daliang Tunnel and the Liuhuanggou Bridge of the Lanzhou-Urumqi High Speed Railway. This paper summarizes the earthquake deformation damage through seismic damage investigation and monitoring analysis, and provides an in-depth analysis of deformation laws and seismic damage remediation methods.
Research conclusions: (1) The Menyuan earthquake caused varying degrees of damage to the Daliang Tunnel, with misalignment and twisting of the tunnel near the F₅ fracture zone and structural damage, decaying towards both ends of the cavern, with lining cracks, spalling off blocks and circumferential cracks (lines) dominating. (2) The tunnel can be divided into misaligned sections, strongly affected sections and seismic damaged sections according to the degree of damage. In the case of severe damage, the tunnel needs to be dismantled and rebuilt, using the principles of circular section form, laying a damping layer between the initial support and the secondary lining, and setting a 2~3 cm wide deformation joint between sections. (3) According to the relative relationship between the tunnel and the fault, the tunnel is divided into two categories: through active fractures and near active fractures, using different design methods to provide a basis for the design and construction of tunnels near faults. (4) The research results are of significance to the research on the seismic mechanism, seismic design and vibration isolation technology of high intensity earthquake and active fault tunnels in China.

Key words： strike slip type fault failure mode tunnel countermeasures

Received: 18 May 2022

PACS:

U456.3

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	LI Guoliang
	HUANG Shuanglin

Cite this article:

LI Guoliang,HUANG Shuanglin. Strike Slip Fault Failure Mode and Tunnel Engineering Countermeasures[J]. Journal of Railway Engineering Society, 2022, 39(8): 18-23.

URL:

https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I8/18

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