Underground structures play a major role in improving transportation and other infra-structure facility in India. Although tunnels are less vulnerable to earthquake when compared to surface structures; examples of various earthquake events such as Kobe earthquake (1995), Chi-Chi earthquake (1999) etc. summarize the possibility of structural damage in the underground structures during high intensity shaking. Similarly, the performance of underground structures during repeated shaking events also requires attention to assess underground structure-soil interaction. Hence in this study, an attempt has been made to estimate the performance of tunnel model under continuous shaking events. For this purpose, 1-g shaking table tests were carried out at 60% density ground installed with scaled down square shaped tunnel model. The experimental studies were carried out at 0.4 g acceleration loading representing high intensity shaking followed by scaled down Uttarkashi earthquake. The dynamic behavior of tunnel–soil interaction under continuous shaking events was analyzed in terms of acceleration response, dynamic soil pressure values and displacement characteristics. For measuring tunnel displacement,2-Dimensional Digital Image Correlation system (2D-DIC) was used. The parameters influencing the performance of tunnel-soil interaction during repeated shaking events were discussed and presented.

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Assessment of Underground Structure-Soil Interaction Under Dynamic Conditions Through Shaking Table Testing

  • K. S. Amith,
  • Shanmugam Ganesh Kumar

摘要

Underground structures play a major role in improving transportation and other infra-structure facility in India. Although tunnels are less vulnerable to earthquake when compared to surface structures; examples of various earthquake events such as Kobe earthquake (1995), Chi-Chi earthquake (1999) etc. summarize the possibility of structural damage in the underground structures during high intensity shaking. Similarly, the performance of underground structures during repeated shaking events also requires attention to assess underground structure-soil interaction. Hence in this study, an attempt has been made to estimate the performance of tunnel model under continuous shaking events. For this purpose, 1-g shaking table tests were carried out at 60% density ground installed with scaled down square shaped tunnel model. The experimental studies were carried out at 0.4 g acceleration loading representing high intensity shaking followed by scaled down Uttarkashi earthquake. The dynamic behavior of tunnel–soil interaction under continuous shaking events was analyzed in terms of acceleration response, dynamic soil pressure values and displacement characteristics. For measuring tunnel displacement,2-Dimensional Digital Image Correlation system (2D-DIC) was used. The parameters influencing the performance of tunnel-soil interaction during repeated shaking events were discussed and presented.