褶皱构造体中深埋隧道岩爆机制与隧道断面适宜性研究

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Abstract Geological structures have some important effects on rockbursts. Taking the deep-buried Gaoligong Mountain tunnel for example，based on field geological investigation，laboratory rock mechanical tests and geostress measurements，adopting the finite element software ANSYS，stress redistribution of the tunnel surrounding rocks，which is induced by tunnel excavation，is analyzed under current geostress. The rockburst characters of the tunnel are also deeply investigated under different case combinations，and possible rockburst positions and intensity are predicted. The results indicate that the rockburst intensity has some relations with the position in the geological structure body where the tunnel is located，as well as the tunnel profile. Namely，the rockburst is prone to happen mostly when the tunnel axis is parallel to the fold axial line and the horseshoe tunnel is located at synclinal-shaft，or the circular arch-vertical wall tunnel is located at the anticlinal-shaft and fold limb department；but when the tunnel axis is vertical to the fold axial line，the possibility of rockburst is small. During tunnel planning and construction，the position where the tunnel axis is vertical to the fold axis，or more suitable tunnel profile，should be selected，which is advantageous for weakening the influence of rockbursts.

Key words： tunneling engineering fold structure Gaoligong Mountain deep-buried tunnel rockburst mechanism tunnel profile finite element numerical simulation

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/2758

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