Abstract
This paper discusses the reasons why the number of karst collapses has been increasing in Tangshan, China, since 1978. It gives the main factors that influence the regional risk of karst collapse and the method for assessing it. Using the risk assessment method developed, three zones in downtown Tangshan, with different risk levels, were delineated. Based on the risk assessment results, some recommendations are given on the treatment of karst collapse and related urban engineering issues.
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