桩周土体物理力学性质对滑坡抗滑桩桩间距的影响
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摘要
抗滑桩加固是滑坡防治的主要工程措施之一,桩周土体物理力学性质对桩-土相互作用有较大影响,进而影响抗滑桩桩间距的确定。基于抗滑桩最小桩间距的计算方法,通过解析法分析了桩周土体物理力学性质对土拱强度条件和桩-土相互作用平衡条件的影响,并利用数值模拟方法研究了桩周土体物理力学性质改变后对抗滑桩桩后滑坡推力分布形式的影响;针对部分渣土边坡中土体物理力学性质较差导致抗滑桩桩间距较小的问题,提出了渣土边坡堆积过程中在抗滑桩设桩处周围填筑改良土体的方法来优化抗滑桩的最小桩间距,并对填筑土体类型、填筑范围和填筑深度进行了研究;讨论了桩周土体物理力学性质对抗滑桩最大桩间距的影响,并将其影响结果与桩周土体物理力学性质对抗滑桩最小桩间距的影响结果进行对比,分析了桩周土体物理力学性质对抗滑桩最小和最大两种桩间距影响效果不同的原因。以深圳某渣土边坡为例验证了在桩周填筑改良土体优化抗滑桩最小桩间距的方法,结果表明该方法在不增加施工成本和施工难度的基础上优化了抗滑桩的最小桩间距,可达到节省渣土边坡治理成本的目的。
Reinforcement of anti-slide piles is one of the main engineering measures for landslide prevention and control.The soil around the piles has a great influence on the pile-soil interaction,which in turn affects the pile spacing.Based on the calculation method of the minimum pile spacing of anti-slide piles,this paper applies the analytical method to analyzing the influence of the physical and mechanical properties of the soil around the piles on the equilibrium conditions of pile-soil interaction and the strength of soil arch a the variation of the thrust distribution pattern of landslide behind piles after the soil around the pile is changed by the numerical simulation.To deal with the problem that the poor physical and mechanical properties of some slag slope lead to the small pile spacing,the paper puts forward the method of filling the improved soil around the piles with anti-slide piles in the process of filling the slag slope,and studies the type,filling range and depth of filling soil.Taking a slag slope in Shenzhen as an example,the paper verifies the method of optimizing the minimum pile spacing of the improved soil in the piles around the piles,which can optimize the minimum pile spacing without increasing the construction cost and construction difficulty and save the cost of slag slope treatment.Finally,the paper discusses the influence of the physical and mechanical properties of the soil around the piles on the maximum pile spacing,and compares the impact results with the influence of the surrounding soil on the minimum pile spacing.The paper also analyzes the reasons for the different effects of the physical and mechanical properties of the soil around the piles on the maximum pile spacing and the minimum pile spacing.
Reinforcement of anti-slide piles is one of the main engineering measures for landslide prevention and control.The soil around the piles has a great influence on the pile-soil interaction,which in turn affects the pile spacing.Based on the calculation method of the minimum pile spacing of anti-slide piles,this paper applies the analytical method to analyzing the influence of the physical and mechanical properties of the soil around the piles on the equilibrium conditions of pile-soil interaction and the strength of soil arch a the variation of the thrust distribution pattern of landslide behind piles after the soil around the pile is changed by the numerical simulation.To deal with the problem that the poor physical and mechanical properties of some slag slope lead to the small pile spacing,the paper puts forward the method of filling the improved soil around the piles with anti-slide piles in the process of filling the slag slope,and studies the type,filling range and depth of filling soil.Taking a slag slope in Shenzhen as an example,the paper verifies the method of optimizing the minimum pile spacing of the improved soil in the piles around the piles,which can optimize the minimum pile spacing without increasing the construction cost and construction difficulty and save the cost of slag slope treatment.Finally,the paper discusses the influence of the physical and mechanical properties of the soil around the piles on the maximum pile spacing,and compares the impact results with the influence of the surrounding soil on the minimum pile spacing.The paper also analyzes the reasons for the different effects of the physical and mechanical properties of the soil around the piles on the maximum pile spacing and the minimum pile spacing.
引文
[1] 王成华,陈永波,林立相.抗滑桩间土拱力学特性与最大桩间距分析[J].山地学报,2001,19(6):556-559.
[2] 常保平.抗滑桩的桩间土拱和临界间距问题探讨[M]//滑坡文集(第十三集).北京:中国铁道出版社,1998:73-78.
[3] 周德培,肖世国,夏雄.边坡工程中抗滑桩合理桩间距的探讨[J].岩土工程学报,2004,26(1):132-135.
[4] 贾海莉,王成华,李江洪.关于土拱效应的几个问题[J].西南交通大学学报,2003,38(4):398-402.
[5] 郑磊,殷坤龙,简文星,等.抗滑桩设计中关于确定桩间距问题的分析 [J].水文地质工程地质,2005(6):71-74.
[6] 蒋良潍,黄润秋,蒋忠信.黏性土桩间土拱效应计算与桩间距分析[J].岩土力学,2006,27(3):445-450.
[7] 肖淑君,陈昌富.基于统一强度理论抗滑桩桩间距的计算[J].工程地质学报,2011,19(2):199-204.
[8] Li C,Wu J,Tang H,et al.A novel optimal plane arrangement of stabilizing piles based on soil arching effect and stability limit for 3D colluvial landslides[J].Engineering Geology,2015,195:236-247.
[9] 张海宽,张友,刘涛,等.基于统一强度理论多层滑坡体中抗滑桩最大桩间距的研究[J].地质科技情报,2017,36(5):203-209.
[10]刘涛,张海宽,张友,等.三维复合多层滑坡体中抗滑桩最小桩间距研究[J].岩石力学与工程学报,2018,37(2):473-484.
[11]Liang R,Zeng S.Numerical study of soil arching mechanism in drilled shafts for slope stabilition[J].Soils and Foundations,2002,42(2):83-92.
[12]Chen C Y,Martin G R.Soil-structure interaction for landslide stabilizing piles[J].Computers and Geotechnics,2002,29(5):363-386.
[13]张建勋,陈福全,简洪钰.被动桩中土拱效应问题的数值分析[J].岩土力学,2004,25(2):173-178.
[14]杨明,姚令侃,王广军.抗滑桩宽度与桩间距对桩间土拱效应的影响研究[J].岩土工程学报,2007,29(10):1477-1482.
[15]杨明,姚令侃,王广军.桩间土拱效应离心模型试验及数值模拟研究[J].岩土力学,2008,29(3):817- 822.
[16]Ashour M,Ardalan H.Analysis of pile stabilized slopes based on soil-pile interaction[J].Computers & Geotechnics,2012,39:85-97.
[17]Tang H M,Hu X L,Xu C,et al.A novel approach for determining landslide pushing force based on landslide-pile interactions[J].Engineering Geology,2014,182:15-24.
[18]桂蕾,殷坤龙,翟月.基于FLAC3D模拟和强度折减法的滑坡稳定性计算[J].安全与环境工程,2011,18(6):9-14.
[19]汪洋,殷坤龙.新滩滑坡稳定性的有限元分析[J].安全与环境工程,2002,9(1):1-4.
[20]李长冬.抗滑桩与滑坡体相互作用机理及其优化研究[D].武汉:中国地质大学(武汉),2009.
[21]《工程地质手册》编写委员会.工程地质手册[M].4版.北京:中国建筑工业出版社,2007.
[22]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2002,21(4):517-521.
[23]Yin Y P,Li B,Wang W P,et al.Mechanism of the December 2015 catastrophic landslide at the Shenzhen landfill and controlling geotechnical risks of urbanization[J].Engineering,2016,2:230-249.
[2] 常保平.抗滑桩的桩间土拱和临界间距问题探讨[M]//滑坡文集(第十三集).北京:中国铁道出版社,1998:73-78.
[3] 周德培,肖世国,夏雄.边坡工程中抗滑桩合理桩间距的探讨[J].岩土工程学报,2004,26(1):132-135.
[4] 贾海莉,王成华,李江洪.关于土拱效应的几个问题[J].西南交通大学学报,2003,38(4):398-402.
[5] 郑磊,殷坤龙,简文星,等.抗滑桩设计中关于确定桩间距问题的分析 [J].水文地质工程地质,2005(6):71-74.
[6] 蒋良潍,黄润秋,蒋忠信.黏性土桩间土拱效应计算与桩间距分析[J].岩土力学,2006,27(3):445-450.
[7] 肖淑君,陈昌富.基于统一强度理论抗滑桩桩间距的计算[J].工程地质学报,2011,19(2):199-204.
[8] Li C,Wu J,Tang H,et al.A novel optimal plane arrangement of stabilizing piles based on soil arching effect and stability limit for 3D colluvial landslides[J].Engineering Geology,2015,195:236-247.
[9] 张海宽,张友,刘涛,等.基于统一强度理论多层滑坡体中抗滑桩最大桩间距的研究[J].地质科技情报,2017,36(5):203-209.
[10]刘涛,张海宽,张友,等.三维复合多层滑坡体中抗滑桩最小桩间距研究[J].岩石力学与工程学报,2018,37(2):473-484.
[11]Liang R,Zeng S.Numerical study of soil arching mechanism in drilled shafts for slope stabilition[J].Soils and Foundations,2002,42(2):83-92.
[12]Chen C Y,Martin G R.Soil-structure interaction for landslide stabilizing piles[J].Computers and Geotechnics,2002,29(5):363-386.
[13]张建勋,陈福全,简洪钰.被动桩中土拱效应问题的数值分析[J].岩土力学,2004,25(2):173-178.
[14]杨明,姚令侃,王广军.抗滑桩宽度与桩间距对桩间土拱效应的影响研究[J].岩土工程学报,2007,29(10):1477-1482.
[15]杨明,姚令侃,王广军.桩间土拱效应离心模型试验及数值模拟研究[J].岩土力学,2008,29(3):817- 822.
[16]Ashour M,Ardalan H.Analysis of pile stabilized slopes based on soil-pile interaction[J].Computers & Geotechnics,2012,39:85-97.
[17]Tang H M,Hu X L,Xu C,et al.A novel approach for determining landslide pushing force based on landslide-pile interactions[J].Engineering Geology,2014,182:15-24.
[18]桂蕾,殷坤龙,翟月.基于FLAC3D模拟和强度折减法的滑坡稳定性计算[J].安全与环境工程,2011,18(6):9-14.
[19]汪洋,殷坤龙.新滩滑坡稳定性的有限元分析[J].安全与环境工程,2002,9(1):1-4.
[20]李长冬.抗滑桩与滑坡体相互作用机理及其优化研究[D].武汉:中国地质大学(武汉),2009.
[21]《工程地质手册》编写委员会.工程地质手册[M].4版.北京:中国建筑工业出版社,2007.
[22]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2002,21(4):517-521.
[23]Yin Y P,Li B,Wang W P,et al.Mechanism of the December 2015 catastrophic landslide at the Shenzhen landfill and controlling geotechnical risks of urbanization[J].Engineering,2016,2:230-249.