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dynamic design method for deep hard rock tunnels and its application

Journal of Rock Mechanics and Geotechnical Engineering 2016年第4期8卷 443-461页

作者： Xia-Ting Feng Chuanqing Zhang Shili Qiu Hui Zhou Quan Jiang Shaojun Li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences

Numerous deep underground projects have been designed and constructed in China, which are beyond the current specifications in terms of scale and construction difficulty. The severe failure problems induced by high in situ stress, such as rockburst, spalling, damage of deep surrounding rocks, and timedependent damage, were observed during construction of these projects. To address these problems, the dynamic design method for deep hard rock tunnels is proposed based on the disintegration process of surrounding rocks using associated dynamic control theories and technologies. Seven steps are basically employed:(i) determination of design objective,(ii) characteristics of site, rock mass and project, and identification of constraint conditions,(iii) selection or development of global design strategy,(iv)determination of modeling method and software,(v) preliminary design,(vi) comprehensive integrated method and dynamic feedback analysis, and(vii) final design. This dynamic method was applied to the construction of the headrace tunnels at Jinping II hydropower station. The key technical issues encountered during the construction of deep hard rock tunnels, such as in situ stress distribution along the tunnels, mechanical properties and constitutive model of deep hard rocks, determination of mechanical parameters of surrounding rocks, stability evaluation of surrounding rocks, and optimization design of rock support and lining, have been adequately addressed. The proposed method and its application can provide guidance for deep underground projects characterized with similar geological conditions.

关键词： Deep hard rock tunnels dynamic design method Rockburst In situ stress Constitutive model

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