锚索抗滑桩在太长高速公路的运用与对比研究
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摘要
以抗滑桩支挡体系为研究对象,基于抗滑桩的设计计算方法,分别对同一标段临近位置的路堑边坡滑坡段进行加固与计算分析,探讨了在相近环境条件下,不同抗滑桩结构的受力特性,最后通过对比分析,结合太长高速地质环境,给出推荐抗滑桩类型。研究结果表明:计算所得普通桩最大弯矩是锚索桩的1.12倍,而最大剪力相较锚索桩增加了17.4%,更易发生破坏。由监测数据可知,锚索桩和普通桩最大剪力分别为17 287和19 920kN。位移量呈现随埋深逐渐减小的趋势,普通桩桩顶位移为34 mm,比锚索桩减小28%,监测数据也满足此变化趋势,锚索桩在桩长2m处位移为33mm,而普通桩为23 mm,桩顶位移虽然锚索桩相较普通桩稍大,但增量为毫米级对滑坡治理影响不大。故该项目试验段相同环境条件下采用锚索抗滑桩更符合实际要求。
引文
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[4]Nicu N D,Antes D R,Kessler R S.Field Measurements on Instrumented Piles under Anoverpass Abutment[J].Highway Research Record.,1971,35(4):90-99.
[5]Mingzhou Bai,Yanqing Du,Xing Kuang,et al.Warning Method and System in Risk Management for Loess Engineering Slopes[J].Journal of Performance of Constructed Facilities,2012,26(2):190-196.
[6]Heyman.Measurement of the Influence of Lateral Earth Pressure on Pile Foundation[J].Proc.6th ICSMFE,1965,32(2):257-260.
[7]Bransby M F,Springman S M.3-D Finite Element Modeling of Pile Groups Adjacent Tosurcharge Loads[J].Computer and Geotechnics,1996,19(4):301-324.
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[9]秦四清,高伶琴.锚杆桩优化设计理论[J].工程地质学报,1997(3).
[10]石玉玲,李貅,李凯玲.锚索抗滑桩的工程优化设计研究[J].工程地质学报,2007(3).
[11]王引生,王恭先,王祯,等.预应力锚索抗滑桩结构优化[J].中国铁道科学,2007(5).
[12]洪滨.锚索抗滑桩有限元数值模拟及优化设计[J].公路交通技术,2008(1).