螺旋钢桩加固土质边坡稳定性分析
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摘要
为研究螺旋钢桩快速加固土质边坡效果,首先验证有限元软件PLAXIS运用强度折减法计算土质边坡稳定系数的可靠性,其次采用正交试验设计方法,选取螺旋钢桩加固位置、桩长以及螺旋叶片直径3个因素对加固效果进行参数敏感性分析,每个因素下选3个水平,并以边坡稳定系数和失稳滑动范围作为加固后土质边坡的评价指标。基于有限元强度折减法分别对9组正交试验对算例中的土质边坡分析。结果表明,加固后边坡稳定系数均有提高;螺旋钢桩在边坡中的桩长为边坡加固中应首要考虑的因素,在一定范围内,桩长越大边坡稳定系数也增大,边坡失稳滑动的范围将减小;加固位置影响次之,叶片直径影响最小。
In order to study the practical effect of the soil slope fast reinforced by screw piles,the reliability of finite element software PLAXIS in calculating soil slope stability coefficient by strength reduction method is verified first,then,the orthogonal test method is adapted to analyze parameter sensitivity of reinforcement effect,taking three factors into consideration:the location of screw piles,the length of piles and the diameter of helix.Each factor is designated with three different levels,and the stability coefficient of the slope and the instability slide range are regarded as evaluation indicators of the reinforced soil slope.Nine groups of orthogonal tests are conducted to analyze the stability of the soil slope in question based on finite element strength reduction method.The results show that the stability coefficient of the slope is improved after reinforcement,and the length of the screw piles embedded in slope is the primary consideration in slope reinforcement;and the longer the pile,the larger the stability coefficient of slope and the smaller the range of instability slide will be;the second consideration is the location of the reinforcement,and the factor of diameter of helix has the least effect on reinforcement.
In order to study the practical effect of the soil slope fast reinforced by screw piles,the reliability of finite element software PLAXIS in calculating soil slope stability coefficient by strength reduction method is verified first,then,the orthogonal test method is adapted to analyze parameter sensitivity of reinforcement effect,taking three factors into consideration:the location of screw piles,the length of piles and the diameter of helix.Each factor is designated with three different levels,and the stability coefficient of the slope and the instability slide range are regarded as evaluation indicators of the reinforced soil slope.Nine groups of orthogonal tests are conducted to analyze the stability of the soil slope in question based on finite element strength reduction method.The results show that the stability coefficient of the slope is improved after reinforcement,and the length of the screw piles embedded in slope is the primary consideration in slope reinforcement;and the longer the pile,the larger the stability coefficient of slope and the smaller the range of instability slide will be;the second consideration is the location of the reinforcement,and the factor of diameter of helix has the least effect on reinforcement.
引文
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[2]李忠,陈思阳,朱彦鹏,等.基于开挖过程稳定性的框架预应力锚杆边坡加固计算方法研究[J].岩石力学与工程学报,2014(S1):2964-2970.
[3]孙书伟,朱本珍,谭冬生.微型桩在路堑边坡加固中的应用及机理分析[J].铁道工程学报,2017(3):6-10.
[4]孙书伟,朱本珍.微型桩群加固土坡抗滑力数值模拟研究[J].铁道工程学报,2018(1):1-5.
[5]杜滨,杨政荣,胡军伟.抗滑微型桩的设计计算方法探讨[J].公路交通科技(应用技术版),2013(5):157-159.
[6]王金梅,张迎宾,赵兴权.微型抗滑桩单桩设计计算模型及算法研究[J].岩土力学,2015(8):2395-2401.
[7]朱安龙,张胤,戴妙林,等.基于FLAC 3D数值模拟的让压锚索边坡加固机理研究[J].岩土工程学报,2017(4):713-719.
[8]徐林荣,华祖焜,夏增明,等.加筋土陡边坡破裂面位置和形态试验研究[J].长沙铁道学院学报,1998(3):6-10.
[9]倪恒,刘佑荣,龙治国.正交设计在滑坡敏感性分析中的应用[J].岩石力学与工程学报,2002(7):989-992.
[10]张旭辉,龚晓南,徐日庆.边坡稳定影响因素敏感性的正交法计算分析[J].中国公路学报,2003(1):37-40.
[11]何本贵,高谦,刘芳.公路路堑边坡稳定性影响因素正交分析与数值模拟[J].岩土工程学报,2005(6):716-719.
[12]付宏渊,刘建华,张立,等.基于正交试验的岩质边坡动力稳定性分析[J].中南大学学报(自然科学版),2011(9):2853-2859.
[13]邓东平,李亮,赵炼恒.地震作用下边坡稳定性分析的拟静力法研究[J].中南大学学报(自然科学版),2014(10):3578-3588.
[14]梁燕,李同录,李家春,等.影响浸水高土石路堤稳定性因素的正交试验研究[J].公路,2014(11):31-35.
[15]吴科亮,丁春林.基于正交试验法的边坡稳定因素敏感性分析[J].华东交通大学学报,2016(2):114-120.
[16]马飞跃,余金煌,李巍,等.正交设计在含砂层边坡敏感性分析中的应用[J].水利与建筑工程学报,2017(4):199-201.
[17]Clemence S P,Lutenegger A J.Industry survey of state of practice for helical piles and tiebacks[J].DFI Journal-The Journal of the Deep Foundations Institute,2015,9(1):21-41.
[18]Dawson E M,Roth W H,Drescher A.Slope stability analysis by strength reduction[J].Geotechnique,1999,49(6):835-840.
[19]Chen W.Limit analysis and soil plasticity[M].Elsevier,2013.
[20]Hanna A,Rahman F,Ayadat T.Passive earth pressure on embedded vertical plate anchors in sand[J].Acta Geotechnica,2011,6(1):21-29.