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With the rapid development of highway construction , highway mileage is a rapid increase in highway construction in karst areas is inevitable . Karst area of bridge foundations , especially the bridge bored pile foundation after the Karst area there is a serious geological disease , load passing through the foundation to the formation pile foundation bearing capacity of the soil around the pile skin friction and the supporting force of the pile end and . In the cave area , due to the existence of the cave , a significant impact on the carrying capacity of the pile , such as pile board top is thick enough, bridge loads , crushing the roof , pile bearing capacity loss caused by the destruction of the bridge structure . Karst area of ??pile foundation construction process may cause oblique pile card drill hole collapse, reaming buried drill , even broken pile construction accident . For the karstification bridge foundation , How to accurately determine the basis of foundation bearing layer thickness , the basis for the design and construction process to ensure the quality of basic engineering , how safe , economic , reasonable choice of the form of bridge foundation and construction methods through the cave when Guidance from a security point of view of the bridge infrastructure design and construction of bridge foundation . Provide a reference for future design of the project , to optimize the bridge foundation construction technology of karst area , to ensure that on the basis of the bridge is structurally safe to shorten the construction period , the project cost savings to avoid construction accidents . Of this article is to bridge foundation design and construction of Jiangxi Province, nine Jiangzhi Rui Chang National Highway Traffic object , karst development at home and abroad and the status quo , and engineering design and construction , summed up the success of the previous foundation construction technology , equipment , quality management experience , karst entry plate bearing layer thickness , pile embedded rock depth design to create economic and social benefits . Provide a reference for the basis of the construction of the complex karst region , made ??a new prompt on a combination of theory and practice in the field of research and application of the technical staff of the engineering sector .
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