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| Research on the Foundation Grouting Reinforcement Scheme in Karst Area of Passenger Dedicated Line |
| ZHANG Wen - xue，CHEN Zhuang, LIU Hai - lu |
| Beijing University of Technology, Beijing 100124，China |
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Abstract Research purposes ： With the development of planning and construction of railway passenger dedicated line in our nationwide, it is more common for railway bridges to pass through karst areas. As a result, how to analyze the effect of grouting reinforcement on the settlement of pile foundation and determine a reasonable grouting reinforcement scheme has become the problem of designing a pile foundation of railway bridge in karst areas. Based on pile foundation engineering of a railway passenger dediciated line in karst area，genuine Lizheng Software that based on code was used to analyze the effect of different grouting reinforcement scheme on the settlement of pile foundation, at the same time reasonable grouting reinforcement scheme was selected.
Research conclusions :(1) Only grouting karst cave can control the tilt of pill foundation well，but it can not control the settlement of pile foundation effectively. (2) Only grouting the soil layer at pile tip can control the settlement of pile foundation effectively, but it can not control the tilt of pill foundation well. (3) Grouting both karst cave and the soil layer at pile tip not only can control the tilt of pill foundation well，but also can control the settlement of pile foundation effectively, as the result it is a better grouting reinforcement scheme. (4) The above conclusions can provide reference for the engineering of pile foundation grouting reinforcement in karst area.
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Received: 22 November 2013
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2014, Vol. 31 
