雅鲁藏布江缝合带深埋长大隧道群岩爆孕育及特征

doi:10.13722/j.cnki.jrme.2018.1038

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Abstract To investigate the inoculation mechanism of rockbursts in extra-long and deep-lying tunnels in Yarlung Zangbo suture zone and to reveal spatial and temporal distribution，failure characteristics and influencing factors of rockbursts，rockburst characters and inoculation effect. The newly built Sangzhuling and Bayu Tunnels in the project of Sichuan-Tibet railway，which locate at the Yarlung Zangbo suture(YZS)，were studied. Based on geological survey，field test，3D finite inversion of in-situ stress and statistical analysis on the rockburst records observed during the construction process，the forming reason，characteristics and influence of high geotemperature and high in-situ stress conditions were studied and the effects of high in-situ stress and high geotemperature on rockbursts in tunnels were analyzed combined with thermodynamic coupling calculation. The results show that，under the control of the special geotectonics and cenozoic magmatic activities in the YZS，the deep-lying and extra-long tunnels in the area present high in-situ stress and high geothermal characteristics. The three-dimensional inversion of in-situ stress indicates that，due to the marked influence of the tunnel depth and horizontal geological structure，the maximum horizontal principal stress and self-heavy stress at the axis of the Sangzhuling tunnel are respectively 1.44 and 0.78 times of those in the Bayu tunnel. The spatial distribution of rockbursts controlled by the vertical stress mainly concentrated in the vault and the face of the tunnel，while the rockbursts influenced by the horizontal stress occur mainly near Yarlung Zangbo River valley. Field experiments show that the rockburst of igneous rocks has a weak of medium tendency and that the difference of the rockburst tendency due to different lithologies in two tunnels is not obvious. Under the influence of the terrestrial heat flow and the depth of partial magmatic melt，the characteristics of high geotemperature of two tunnels vary from each other greatly. Calculations using thermo-mechanical coupling model show that the coupled thermal-mechanical effect in the excavation process of Sangzhuling tunnel is obvious under the influence of high geotemperature and the rockbursts in Bayu tunnel are mainly affected by the high in-situ stress.

Key words： tunnelling engineering Yarlung Zangbo suture(YZS) rockburst inoculation rockburst characters high in-situ stress high geotemperature

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	Articles by authors
	YAN Jian1
	2
	HE Chuan1
	WANG Bo1
	MENG Wei1
	WU Fangyin1

Cite this article:

YAN Jian1,2,HE Chuan1, et al. Inoculation and characters of rockbursts in extra-long and deep-lying tunnels located on Yarlung Zangbo suture[J]. , 2019, 38(4): 769-781.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.1038 OR http://www.rockmech.org/EN/Y2019/V38/I4/769

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