|
|
|
| Engineering Practice and Research on the High Speed Railway Composite Foundation with CFG Pile a Compaction Pile |
| XU Xing - wang |
| (China Railway First Survey and Design Institute Group Ltd，Xi’an，Shaanxi 710043，China) |
|
|
|
|
Abstract Abstract ：Research purposes： In recent years，the high speed railway composite foundation with CFG pile A compaction pile is the emerging foundation treatment technology for the collapsible loess ground with upper wet - soil layer and bottom soft - soil layer. There is no mature practical experience at home and abroad. The cloth pile combination form， calculation methods，construction technology and sedimentation control empirical coefficient all need the validation from engineering practice. Resarch conclusions ：( 1) The composite modulus of the composite foundation with long - short - piles of CFG pile A compaction pile are appropriate to take the composite modulus method in combination with the determination of bearing capacity ratio. (2) Under this technical treatment，90% ~95% of the total collapsible loess foundation settlement can commonly be settled in 3 ?6 months. (3) The value of correction coefficient in settlement calculation can take 0. 3 when the modulus quantity is greater than 15 MPa，the value of correction coefficient in settlement calculation can take 0. 2 ~0. 25 when the modulus quantity is greater than 20 MPa. (4) Using a square layout in the collapsible loess long - short - pile is easier for site construction and quality control，so a square layout should be preferred to the ground treatment scheme. (5) To reduce the effect of shrinkage，hole shrinkage and broken pile on the CFG pile of the long pile，pile materals with the higher unconfined compression strength are the first choice. (6) The research result has higher application value to promote the foundation treatment of high speed railway in collapsible loess areas.
|
|
Received: 30 December 2015
|
|
|
|
|
|
|
2016, Vol. 33 
