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| Procedure for Test and Inspection of Composite Subgrade Tested by Compaction Pile in Original Place |
| HUANG Tian-de |
| The Third Engineering Bureau Group Co. Ltd. of Chinese Railway, Taiyuan, Shanxi 030001, China |
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Abstract Research purposes: It required of selecting an effective method for testing and identifying result of subgrade treated by compaction pile. The test and inspection method in original place introduced in this paper is an inspection method carried out on site.
Research methods: The test in original place is a static touch test carried out before consolidation of compaction pile. The relation is defined between specific injection resistance value of pile body and specific resistance value of soil among piles through contrast test of different solidified materials for pile body. The inspection and control of composite subgrade can be carried out during construction based on this contrast relation.
Research results: It shows in details how to establish relative relation and how to define procedure and time of inspection in this paper. The test for specific injection resistance value of pile body should be first done indoor, and then done on site for determination. The test for specific injection resistance value of soil among piles should be done in 5~15 days after piling. The test and inspection control and make less damage to pile body, with fast speed and low cost. This method has been applied in engineering test for ZXZQ04 Bidding of Zhengzhou-Xi’an Passenger Dedicated Railway Line.
Research conclusions: The test and inspection of composite subgrade treated by compaction pile in original place can meet needs of construction with easy operation and high accuracy and be applied widely.
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Received: 27 April 2006
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2006, Vol. 23 
