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| Analysis of Stability of Subsidence Surface in Karst Area and Zoning for Engineering Geology |
| WU Zhi-sheng |
| The Fourth Survey and Design Institute of China Railway, Wuhan, Hubei 430063, China |
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Abstract Research purposes: Subsidence in karat area is an unfavorably geologic problem that has been occurred frequently over 20 years. The natural characteristics of karat and fixed factors of geology are focused in overall assets to main causes for subsidence stipulated in Regulation of Unfavorable Geologic Survey for Railway Engineering, but the most active and actual factors influencing water environment by the production activities of human are less focused. Therefore, zoning unstable zone is loose under personal object factors and makes construction cost rising. The purposes of this paper are to rationally zone disease working site in design so as to control construction cost effectively.
Research methods: The analysis and research were made on the mechanism and cause for subsidence, especially the cause for submarine erosion. It required paying attention to the important effects of personal factor on subsidence.
Research results: It is believed through research that the most recent subsidence, the outcomes related to personal factor in the same period, at least a synchronic outcome, except a few of them are the outcomes of geologic age and historic period. There is less subsidence without man-made action. The author believes the engineering geology shall be divided into stable zone, relative stable zone, unstable zone and subsidence zone according to personal factor and natural factor of geology. The treatment shall be carried out to them pointedly and focally according to their stability and disaster level.
Research Conclusions: Based on study and discussion, it is believed Railway Survey Regulation will be supplemented and improved in order to avoid phenomena of dismissing unfavorable geology or broadening the scope of unfavorable geology.
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Received: 17 March 2006
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2006, Vol. 23 
