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| Analysis of Safe Roof Thickness of Karst Cavity under Bridge Load in Karst Area |
| JIANG Xian-ping, WANG Chun-lei |
| The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China |
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Abstract Research purposes：Taking a bridge on one passenger dedicated line in karst area as an example and combining with the distribution pattern of the real space of karst cavity, the stress characteristics of rock mass under bridge load was analyzed with three-dimensional finite element to determine the safe roof thickness of karst cavity. The results could provide the reference to the design of bridge foundation of high speed railway in karst area.
Research conclusions： The safety coefficient of rock m ass nearby the bridge foundation was over 1.2 and the safety coefficient of the roof of the karst cavity was over 1.3 when the safe roof thickness of karst cavity was 30m or 25m, so the roof of karst cavity was in safety. The safety coefficient of local rock mass around the karst cavity was about 1.1 when the safe roof thickness of karst cavity was 20m, so the roof of the karst cavity was basically in safety, but the stored strength of rock mass was insufficient. The minimum safe roof thickness of karst cavity under bridge load presented in this paper was about 20m and the maximum buried depth of bridge foundation was 13m while the design buried depth was 8m, therefore, the roof of karst cavity was in safety.
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Received: 16 December 2009
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2010, Vol. 27 
