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  2013, Vol. 34 Issue (4): 352-360    DOI:
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The zonal disintegration mechanism of isotropic rock masses around a deep circular tunnel? subjected to dynamic unloading
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Abstract  A new mechanical model is proposed to investigate the zonal disintegration mechanism of isotropic rock masses around a deep circular tunnel subjected to dynamic unloading under hydrostatic pressure condition as well as the total elastic stress-field distributions. Effects of unloading rate and dynamic mechanical parameters of isotropic deep rock masses on the zonal disintegration phenomenon of the surrounding rock masses around a deep circular tunnel are taken into account.The number and size of fractured and non-fractured zones is determined using the Hoek-Brown criterion. Numerical computation is carried out. It is found from numerical results that the number and size of fractured and non-fractured zones significantly depend on unloading rate and dynamic mechanical parameters of deep rock masses.
Key wordsThe zonal disintegration      isotropic rock masses      deep circular tunnel      dynamic unloading     
Received: 28 April 2012     
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http://manu39.magtech.com.cn/Jwk_gtlxxb/EN/     OR     http://manu39.magtech.com.cn/Jwk_gtlxxb/EN/Y2013/V34/I4/352
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