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《Chinese Journal of Underground Space and Engineering》 2010-03
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Deformation Control Criteria of Deep Excavations

Xu Zhonghua,Wang Weidong(Department of Underground Structure & Geotechnical Engineering,East ChinaArchitectural Design & Research Institute Co.,Ltd.,Shanghai 200002,China)  
For deep excavations with complex environment,the concept of performance-based design rather than capacity-based design should be adopted.One of the key problems in a performance-based design is to determinate deformation control criteria.Two methods are proposed to determine the deformation control criteria of deep excavations.The first method is based on the bearing capacity of additional deformation of the surrounding environment and the second method is based on the deformation behavior of a large number of deep excavation histories in Shanghai.After introducing the bearing capacity of additional deformation of buildings,the procedure of determining the deformation control criteria of deep excavations of the first method is proposed.Then the concept of environment protection grade is introduced and the environment condition of deep excavations is classified into three grades.A deformation control criterion of each grade is proposed according to a large number of case histories in Shanghai district.This deformation control criterion can be used as a guide for the design of deep excavations.
【Fund】: 上海市科委科技攻关重点项目(08201200901)
【CateGory Index】: TU753
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