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| Research on the Influence of Karst Leakage on the Integrity of Cast-in-place Pile |
| CHANG Juyou1, CAO Qiang1, ZHAO Zhong2, YI Honghong2, LIU Fei3, CHANG Chao1 |
1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China;
2. Sichuan Baotieqiao Tunnel Engineering Inspection Technology Co. Ltd, Chengdu, Sichuan 610030, China;
3. China Railway 10 Bureau Engineering Group Co. Ltd, Hefei, Anhui 230000, China |
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Abstract Research purposes: The article 4.4.6 of the Technical Specification for Testing of Railway Piles (TB 10218-2019) states that: the reflection signal from the bottom of end-bearing piles detected by reflected wave method should be reverse feature, which can be used to detect the reflection signal from the bottom of end-bearing piles in situ, the reflection wave method is used to detect the reflection signal characteristics of the bottom of the end-bearing pile, which is more positive than reverse, and the karst leakage of the cast-in-place pile in limestone stratum leads to waste of concrete and affects the integrity of the pile. Therefore, the reflection wave method is used to detect the reflection signal from the bottom of end-bearing piles, and how to control the waste of concrete karst slurry is studied.
Research conclusions: (1) The rock surface at the end of the end-bearing pile is rough and uneven, and a small amount of sediment remains, which forms a low impedance sediment concrete with an average thickness of about 50 mm, which makes the reflection of the bottom of the pile present a positive feature, there are only a few hand-dug piles whose rock strength is greater than the strength of pile concrete. The pile bottom is clean and has no water. (2) The end-bearing pile construction causes karst leakage and waste of concrete, and also causes serious segregation of the pile, re-work and time-consuming materials, which can be replaced by permanent double cage or permanent steel casing pile construction. (3) The research results can provide reference for the construction of cast-in-place pile in karst area of railway and highway.
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Received: 21 January 2022
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| [1] |
TB 10218—2019,铁路工程基桩检测技术规程[S].TB 10218—2019,Technical Specification for Testing of Railway Piles[S].
|
| [2] |
Q/CR 9212—2015,铁路桥梁钻孔桩施工技术规程[S].Q/CR 9212—2015,Technical Specification for Bored Pile Works of Railway Bridge Constructon[S].
|
| [3] |
TB 10752—2018,高速铁路桥涵工程施工质量验收标准[S].TB 10752—2018,Standard for Constructional Quality Acceptance of High-speed Railway Bridge and Culvert Engineering[S].
|
| [4] |
胡晓军,何玉先.浅析螺杆桩在铁路路基工程施工中的应用[J].高速铁路技术,2020(4):97-100.Hu Xiaojun,He Yuxian. Application of Screw Pile in Railway Subgrade Engineering Construction[J].High Speed Railway Technology,2020(4):97-100.
|
| [5] |
常聚友,王宇,严颜,等.冲击成孔双笼灌注桩在复杂地层中的应用研究[J].铁道工程学报,2013(12):19-22.Chang Juyou,Wang Yu,Yan Yan,etc.Application Research on Percussion Hole Double Cage Pouring Pile in the Complex Formation[J]. Journal of Railway Engineering Society,2013(12):19-22.
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2022, Vol. 39 
