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| Application of Super - deep Piezocone Penetration Tests in Engineering Investigation |
| WANG Bo, LI Jian - qiang, FENG Tao, LIN Zhi - heng |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu, Sichuan 610031, China) |
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Abstract Abstract ： Research purposes ： Relying on the engineering investigation project of Bangladesh Padma multifunctional bridge，we introduced the foreign advanced piezocone penetration test( PCPT) equipment, and sought for the best way of deeper PCPT tests. The deep PCPT test technology was developed and improved in the practical engineering through technology improvement，to increase the efficiency，quality and drop cost，create beneficial result.
Research conclusions:(1) Apply the multiple - casing method to conquer the problem of great friction force of side wall of poles and that the PCPT test unable to penetrate the gravel and pebble interlayer. The PCPT test depth on land area finally went down to more than 100 m. (2) Compared with the geological drilling， the deep PCPT technology has obvious advantages in the aspects of data reliability，timeliness and economic efficiency. （3 ) As technical view，it is obvious that the super - deep PCPT test and standard penetration test( SPT) have good depth fitting degree. (4) In the engineering investigation on soft soil and sandy area，the technology became increasingly reliable so that it was deserved the popularization and application in similar area. (5 ) The technology needs to be further studied for the geological survey on the water or offshore regions.
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Received: 06 May 2016
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2016, Vol. 33 
