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| Integrity Testing of Anti － slide Pile for Railway in Mountain Area and Analysis of Causes for Pile Fracture |
| CHANG Ju － you，GAO Jing － hong，LIU Zhi － jun |
| China Railway Eryuan Engineering Group Co． Ltd，Chengdu，Sichuan 610031，China |
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Abstract Research purposes: The acoustic wave scenography or reflection wave method was used to test the integrity of the anti － slide pile in sandstone or mudstone stratum． The test results showed the pile － fracture characteristics of the apparent low sound speed and repeated reflection of the reflected waves occurred to a number of piles in the same elevation． The verification of the excavation and core － drilling showed the piles were broken． So it was necessary to research the reasons for the the pile fracture and how to prevent the pile fracture．
Research conclusions: The cause for the anti － slide pile fracture was the manual excavation and blasting when conducting the anti － slide pile to easily make some massifs in the deepest area where was the first to bore unstable and slide because the the places where the piles fractured were of the weak soft layers and their inclination of the fissure surfaces were basically with the that of the inclined slope of massif． Therefore，to avoid the anti － slide pile fracture in the construction，the small diameter (Φ= 20 cm) bore core would be used to form pore time and again and gradually form the rectangle pile pore，and at the same time the intervals anti － slide pile would be conducted． Namely，the second batch of the interval anti － slide pile would be conducted after 28 days that the concrete pouring to the first batch of the interval anti － slide pile was finished．
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Received: 25 October 2011
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［1］ JGJ 106—2003，建筑基桩检测技术规范［S］．
JGJ 106—2003，Technical Code for Testing of Building Foundation Piles［S］．
［2］ TB 10218—2008，铁路基桩检测技术规程［S］．
TB 10218—2008， Technical Code for Testing of Foundation Piles of Railway Engineering［S］．
［3］ JGJ 79—2002，建筑地基处理技术规范［S］．
JGJ 79—2002，Technical Code for Ground Treatment of Buildings［S］．
［4］ GB 50021—2001，岩土工程勘察规范［S］．
GB 50021—2001，Code for Investigation of Geotechnical Engineering［S］．
［5］ TB 10013—2004，铁路工程物理勘探规程［S］．
TB 10013—2004，Code for Geophysical Prospecting of Railway Engineering［S］．
［6］ TB 10102—2004，铁路工程土工试验规程［S］．
TB 10102—2004， Code for Soil Test of Railway Engineering［S］．
［7］ GB/T 50123—1999，土工试验方法标准［S］．
GB/T 50123—1999， Standard for Soil Test Method［S］．
［8］ 常聚友，刘志军，周其祥． 路基端承灌注桩完整性及承载力研究［J］． 铁道工程学报， 2008( 2) : 35 － 39．
Chang Juyou，Liu Zhijun，Zhou Qixiang． Research on Completeness and Bearing Capacity of End Bearing Cast － in － place Pile for Subgrade［J］． Journal of Railway Engineering Society，2008( 2) : 35 － 39．
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2012, Vol. 29 
