Model tests for safety of stick-slip fault tunnel in strong earthquake area using rigid-flexible combined anti-shock absorption technology

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (5) : 194-200.

CUI Guangyao1, LI Pengyu1, WANG Mingnian2,3, ZHU Chang’an4

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Abstract

In order to study using rigid-flexible combined anti-shock absorption technology for safety of stick-slip fault tunnel in strong earthquake area, a model was fabricated based on F8 stick-slip fault segment in Longxi tunnel of Duwen super highway in Sichuan Province, static stick-slip dislocation tests and large 3-direction 6-DOF strong shock tests were conducted for the model.The test data was analyzed and used to study longitudinal strain, contact pressure and internal force of upper and lower tunnel structure.The test results showed that after setting shock absorption gap, increase multiple of longitudinal strain and contact pressure along longitudinal tunnel structure varies from severely to more uniformly; effect of taking tunnel structure-strengthening measures is limited for resisting stick-slip dislocation and strong earthquake shock; effect of setting shock absorption gap is obvious for resisting stick-slip dislocation and strong earthquake shock; anti-shock absorption effect of tunnel structure’s longitudinal strain is more than 97%, the anti-shock absorption effect of contact pressure is more than 86% and the minimum value of safety factor is increased more than 5-fold; using rigid-flexible combined anti-shock absorption technology for a stick-slip fault tunnel in strong earthquake area can greatly improve its safety, the minimum value of its safety factor can be increased more than 8-fold; the study results can provide a reference for the shock absorption fortification design of stick-slip fault tunnels in strong earthquake area.

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tunnel engineering / strong earthquake area / stick-slip fault / rigid-flexible combined / anti-shock absorption / model test

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CUI Guangyao1, LI Pengyu1, WANG Mingnian2,3, ZHU Chang’an4. Model tests for safety of stick-slip fault tunnel in strong earthquake area using rigid-flexible combined anti-shock absorption technology[J]. Journal of Vibration and Shock, 2020, 39(5): 194-200

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