Quantitative foundation stability evaluation of urban karst area: Case study of Tangshan, China
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, China; Department of Geology, Faculty of Science, University of Ibadan, Ibadan, Nigeria
Karst is a potential geological disaster threatening urban construction. However, the existing methods for evaluating the stability of karst foundations are qualitative. This makes it difficult to propose reasonable and practical suggestions for optimal treatment measures in engineering projects. This paper presents a set of quantitative comprehensive evaluation methods to analyze the karst foundations in a residential area of Tangshan, China. Analyses of the karst formation mechanism and development law are undertaken in combination with a numerical simulation to evaluate the stability of the karst foundations of urban high-rise buildings using the results of a field research to determine the model and the parameters for the numerical calculation. The depth of influence of the foundation of an 8-storey building is less than 30 m. Thus, treatment of the building foundation is not required if there is no karst in the range of 30 m under the surface. However, foundation treatment in the karst zone up to 7 m is required for a 26-storey building with a depth of influence of about 60 m in order to meet the requirements of foundation stability. The employment of a combined approach method is proposed, therefore, as it provides a systematic and practical method for the challenge of optimizing the foundation treatment method for urban high-rise structures in karst areas. © 2015 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved.
Chemical analysis; Foundations; Stability; Tall buildings; Building foundations; Comprehensive evaluation; Comprehensive investigation; Foundation stability; High rise structures; Karst development; Numerical calculation; Urban construction; Landforms
41172270, NSFC, National Natural Science Foundation of China; 41302233, NSFC, National Natural Science Foundation of China