预应力管桩桩端土遇水软化研究
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- 英文论文题名：Study on bearing stratum softening of prestressed concrete tube pile when encountering water
- 论文作者：张先伟 ; 李仁耿
- 英文论文作者：Zhang Xianwei ; Li Rengeng ; State Key Laboratory of Geomechanics and Geotechnical Engineering ; Institute of Rock and Soil Mechanics ; Chinese Academy of Sciences ; Society of civil engineering and architecture of Shunde district ; Foshan ; Guang dong
- 年：2016
- 作者机构：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;广东省佛山市顺德区土木建筑学会;
- 论文关键词：管桩 ; 软化 ; 桩端土 ; 遇水 ; 强度
- 英文论文关键词：tube pile ; softening ; bearing stratum ; encountering water ; strength
- 会议召开时间：2016-09-26
- 会议录名称：中国土木工程学会2016年学术年会论文集
- 语种：中文
- 分类号：TU473.1;TU753.3
- 学会代码：OGTY
- 会议名称：中国土木工程学会2016年学术年会
- 会议地点：中国北京
- 主办单位：中国土木工程学会
- 学会名称：中国土木工程学会
- 页数：11
- 文件大小：2679k
- 原文格式：O
- 会议级别：全国
摘要
为判断预应力管桩在强风化岩层是否存在遇水软化现象。选择广东省佛山市顺德区粉砂质泥岩和花岗片麻岩风化层作为试验场地,联合静力触探、旁压试验、高应变测试、静载试验多种原位测试手段,比较压桩前后桩端土的力学指标和强度变化。研究表明:两个试验场地压桩后都没有发生遇水软化的现象;预应力管桩桩尖是否开口,桩管是否采用混凝土封底,对桩的承载力基本没有影响。研究还得到强风化粉砂质泥岩和花岗片麻岩的桩端土强度增长期分别是20天和45天。该研究对于指导风化岩土地区的桩基设计与施工具有一定的指导意义。
In order to investigate softening phenomenon at bearing stratum strong of weathered rock of prestressed pipe piles.Two site with weathered silty mudstone and granite-gneiss layer in Shunde district of Foshan City,Guangdong Province,were selected,and various in-situ testing,including static cone penetration and pressuremeter tests,high strain test and loading test were conducted to study changes of mechanical indicators and strength of pile-end soils.Results showed that pile-end soils of prestressed concrete tube pile did not exhibit softening when encountering water.Neither pile tip opening nor pipe with concrete has no effect on pile bearing capacity.In addition,period of strength growth for weathered silty mudstone and weathered granitic gneiss were 20 days and 45 days,respectively.These results have profound guiding significance for design and construction of tube piles in the weathered rock foimation.The study to guide the weathered rock-soil pile in the area of are of significance.
In order to investigate softening phenomenon at bearing stratum strong of weathered rock of prestressed pipe piles.Two site with weathered silty mudstone and granite-gneiss layer in Shunde district of Foshan City,Guangdong Province,were selected,and various in-situ testing,including static cone penetration and pressuremeter tests,high strain test and loading test were conducted to study changes of mechanical indicators and strength of pile-end soils.Results showed that pile-end soils of prestressed concrete tube pile did not exhibit softening when encountering water.Neither pile tip opening nor pipe with concrete has no effect on pile bearing capacity.In addition,period of strength growth for weathered silty mudstone and weathered granitic gneiss were 20 days and 45 days,respectively.These results have profound guiding significance for design and construction of tube piles in the weathered rock foimation.The study to guide the weathered rock-soil pile in the area of are of significance.
引文
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[6]雷华阳,李肖,陆培毅,等.管桩挤土效应的现场试验和数值模拟[J].岩土力学,2012,33(4):1006-1012.(Lei Hua-yang,Li Xiao,Lu Pei-yi,et al.Field test andnumerical simulation of squeezing effect of pipe pile[J].Rock and Soil Mechanics,2012,33(4):1006-1012.(in Chinese))
[2]宋富新.基桩持力层岩土承载性状监控试验分析[J].广东土木与建筑,2009,(6):58-59.
[3]郑永民,张建生.顺德地区预应力管桩持力层遇水易软化试验研究[J].广东土木与建筑,2011(12):57-61.
[4]周翠英,邓毅梅,谭祥韶,等.饱水软岩力学性质软化的试验研究与应用[J].岩石力学与工程学报,2005,24(1):33-38.(Zhou Cui-ying,Deng Yi-mei,Tan Xiang-shao,et al.Experimental research on the softening of mechanical properties of saturated soft rocks and application[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(1):33-38.(in Chinese))
[5]林永安.花岗岩残积土静压管桩工程常见问题分析[J].广东建材,2006(6):35-36.
[6]雷华阳,李肖,陆培毅,等.管桩挤土效应的现场试验和数值模拟[J].岩土力学,2012,33(4):1006-1012.(Lei Hua-yang,Li Xiao,Lu Pei-yi,et al.Field test andnumerical simulation of squeezing effect of pipe pile[J].Rock and Soil Mechanics,2012,33(4):1006-1012.(in Chinese))