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| Support Design and Monitoring Analysis of Foundation Pit Adjacent to High Speed Railway in Soft Soil Area |
| YU Ting - xin |
| (China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063 , China) |
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Abstract Research purposes: The foundation pits which are adjacent to high speed railway are increasing, causing settlement easily in soft soil area which affects safe operation seriously. At present support design and monitoring technology of foundation pit adjacent to high speed railway in soft soil area is immature. Design experience and monitoring data is extremely deficient. The paper relying on the example of foundation pit adjacent to high speed railway in soft soil area researched the support design and monitoring.
Research conclusions :( 1) Suggestion of strengthening support according to deformation was put forward，which reduced roadbed settlement. (2) Settlement time of high speed railway after foundation pit excavation in soft soil area was long and it had creep characteristics. After each layer soil excavation，settlement rate was from the larger to the smaller and the final settlement value was very large. (3 ) In the same location settlement of shoulder, catenary column and track was basically same. Settlement rate and value in the central part of foundation pit was larger than both sides and the part far away from foundation pit. (4) Settlement at toe of slope was smaller than shoulder, catenary column and track. (5)The settlement of junctional zone between foundation pits was larger, caused by simultaneous excavation and dewatering.(6 ) The effect distance caused by excavation and dewatering was about five times of foundation pit depth. (7 ) Experience of design and monitoring can be referred to for foundation pits design adjacent to high speed railway.
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Received: 08 July 2015
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2015, Vol. 32 
