高原多年冻土区隧道浅埋段热棒群防护工程效果评价

doi:10.13722/j.cnki.jrme.2016.0344

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Abstract

Taking the protective engineering of thermal probe group in shallow buried section of Jiangluling tunnel in Road G214 in plateau permafrost regions as an example，based on the study of the characteristics of the ground temperature change and the change of the freezing thawing circle under both the natural condition of the tunnel and the protection of the thermal probe group，the engineering effect of using thermal probe group to initiate active thermal protection on shallow buried section of tunnel in plateau permafrost regions was evaluated. The research shows that，under natural conditions，the range of freeze-thawing circle caused by tunnel construction is larger than 2.2 meters，and the refreezing time is more than 4 years. Under the protection of the thermal probe group，in Jiangluling tunnel left exit hole，the artificial permafrost upper limit evaluates elevate 0.5 meter，and the refreezing time of freezing thawing circle in tunnel top area is 1 year，while its counterpart in surrounding area is 2–3 years. The ground temperature variation is overall similar to the sine and cosine curve. Specifically，the ground temperature is relatively high in warm season and low in cold season，and it decreases in the corresponding period every year with time going by. Elevation results show that，utilizing thermal probe group to initiate active thermal protection on shallow buried section of tunnel in permafrost regions is an effective engineering measure to protect the permafrost environment of the tunnel. It can quickly erase the thermal interference on the permafrost surrounding rock of the tunnel caused by construction and maintain the stability of the permafrost surrounding rock，simultaneously create frost proof curtain on the surrounding rock to reduce to tunnel structure，revent the water above frozen layer from infiltrating into the tunnel structure.

Key words： soil mechanics permafrost shallow-buried tunnel section thermal probe geothermal features Engineering effect

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	Articles by authors
	LI Fen1
	LIU Kun1
	CAI Hancheng1
	YANG Yongpeng1
	CHENG Hongwei2

Cite this article:

LI Fen1,LIU Kun1,CAI Hancheng1, et al. Engineering effect evaluation of thermal probe group protection for the shallow section of permafrost tunnel in plateau permafrost area[J]. , 2017, 36(S1): 3416-3422.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0344 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3416

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