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Three-Dimensional Collapse Analysis for a Shallow Cavity in layered strata Based on Upper Bound Theorem

Computer Modeling in Engineering & Sciences 2020年第7期124卷 375-391页

作者： Hongtao Wang Ping Liu Lige Wang Chi Liu Xin Zhang Luyao Liu School of Civil Engineering Shandong Jianzhu UniversityJinanChina Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University) Ministry of EducationJinanChina Department of Chemical and Biological Engineering University of SheffieldSheffieldUK State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhanChina Jinan Rail Transit Group Co. Ltd.JinanChina

layered rock strata are observed to be common during the excavation of tunnels or cavities,and may significantly affect the deformation and failure characteristics of surrounding rock masses due to various complex forms and mechanical *** this paper,we propose a three-dimensional axisymmetric velocity field for roof collapse of shallow cavities in multi rock layers,by considering the influences of roof cross-section shapes,supporting pressure,ground overload,*** internal energy dissipation rate and work rates of external forces corresponding to the velocity field are computed by employing the Hoek-Brown strength criterion and its associated flow ***,the equations of the collapse surfaces and the corresponding weight of collapsing rock masses are derived on the basis of upper bound ***,we validate the proposed method by comparing the results of numerical calculations and existing research *** change laws of the collapse range under varying parameters are obtained for the presence of rectangular and spherical *** also find that the three-dimensional mechanism is relatively safer for engineering designing actually,compared with the traditional two-dimensional *** these conclusions may provide workable guidelines for the support design of shallow cavities in layered rock strata practically.

关键词： Shallow cavity three-dimensional collapse layered rock strata upper

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