渗流作用下深基坑开挖抗隆起破坏数值模拟
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摘要
利用plaxis数值模拟软件,对临河深基坑开挖降水引起的渗流进行模拟计算,通过6组模型在考虑两次降水、多次降水的情况下,研究改变土质、地下连续墙入土深度、坑内工程桩对深基坑抗隆起稳定性的影响。研究结果表明,两次较为深度的降水土体的位移回弹和沉降量会很大,连续墙的设置插入比近似在0.5,可以发挥它的最大性能,过深的连续墙对基坑抗隆起的影响会减小。在渗流条件下基坑开挖的最底层,桩周土体也会因为水压力造成较大的位移回弹呈现土体的回弹量高于桩体的回弹量。该结果可以为进一步研究渗流对深基坑支护体系的影响提供参考。
Considering the two precipitation and frequent rainfall situation,the Plaxis numerical simulation software was used to study six groups of models. The effect of changing the soil,the depth of the underground continuous wall,the pile in the pit on the stability of deep foundation pit were analyzed. The results show that in twice the depth of precipitation soil resilience and settlement will be great,wall insertion ratio is approximately 0.5 which can play its maximum performance,too deep continuous wall will impacts less on the pit wall. Under seepage conditions,rebound of soil around the pile is larger than that of pile for the exitence of rebound caused by water pressure. The results can provide a reference for further research on the impact of seepage deep excavation system.
Considering the two precipitation and frequent rainfall situation,the Plaxis numerical simulation software was used to study six groups of models. The effect of changing the soil,the depth of the underground continuous wall,the pile in the pit on the stability of deep foundation pit were analyzed. The results show that in twice the depth of precipitation soil resilience and settlement will be great,wall insertion ratio is approximately 0.5 which can play its maximum performance,too deep continuous wall will impacts less on the pit wall. Under seepage conditions,rebound of soil around the pile is larger than that of pile for the exitence of rebound caused by water pressure. The results can provide a reference for further research on the impact of seepage deep excavation system.
引文
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[11]高伟,窦远明,周晓理,等.分步开挖过程中基坑支护结构的变形和土压力性状研究[J].岩土工程学报.2006,8(增1):1455-1459.(Gao Wei,Dou Yuanming,Zhou Xiaoli,et al.Step by step in the process of excavation of foundation pit deformation and earth pressure of retaining structure characters of[J].Chinese Journal of Geotechnical Engineering,2006,28(Supp.1):1455-1459.(in Chinese)).
[12]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座——Ⅱ有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.(Zhao Shangyi,Zheng Yingren,Zhang Yufang.Public lecture of the limit analysis finite element method—ⅡStudy of finite element strength reduction method in the slope instability[J].Rock and Soil Mechanics,2005,26(2):332-336.(in Chinese))
[13]林杭,曹平,宫凤强.位移突变判据中监测点的位置和位移方式分析[J].岩土工程学报,2007,29(9):1433-1438.(Lin Hang,Cao Ping,Gong Fengqiang.Criterion in displacement monitoring point mutation position and displacement mode analysis[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1433-1438.(in Chinese))
[14]张建勋,陈福全.用强度折减有限元法分析土坡稳定问题[J].山东科技大学学报(自然科学版),2004,23(1):115-117.(Zhang Jianxun Chen Fuquan.With strength reduction finite element method analysis of slope stability[J].Shandong University of Science and Technology(Natural Science),2004,23(1):115-117.(in Chinese))
[15]冯虎,刘国彬.考虑工程桩影响软土深基坑隆起破坏的数值模拟研究[J].岩土工程学报,2011,33(增2):314-320.(Feng Hu,Liu Guobin.Consider the impact pile numerical simulation of soft soil foundation uplift damage[J].Chinese Journal of geotechnical engineering,2011,33(Supp.2):314-320.(in Chinese))
[16]徐方京,谭敬慧.地下连续墙深基坑开挖综合特性研究[J].岩土工程学报,1993,5(6):28-33.(Xu Fangjing,Tan Jinghui.Underground continuous wall synthesis characteristics of deep excavation[J].Chinese Journal of Geotechnical Engineering,1993,5(6):28-33.(in Chinese))
[17]张耀东,龚晓南.软土基坑抗隆起稳定性计算的改进[J].岩土工程学报,2006,28(增1):1378-1382.(Zhang Yaodong,Gong Xiaonan.Soft soil foundation heave stability improved computing[J].Chinese Journal of Geotechnical Engineering,2006,28(Supp.1):1378-1382.(in Chinese))
[18]钟艳红.昆明地区深基坑工程的优化设计与研究[D].昆明:昆明理工大学,2012.(Zhong Yanhong.Kunming area deep foundation pit engineering optimization design and research[D].Kunming:Kunming University of Science and Technology,2012.(in Chinese))
[2]曾宪明,林润德,易平.基坑与边坡警示录[Z].北京:中国建筑工业出版社,1999.(Zengxian Ming,Lin Runde,Yi Pin.Slope excavation and warnings recorded[Z].Beijing:China Building Industry Press,1999.(in Chinese))
[3]周正军,陈建康,吴震宇,等.边坡稳定数值计算中失稳判据和岩土强度屈服准则[J].四川大学学报(工程科学版),2014,46(4):6-12.(Zhou Zhengjun,Chen Jiankang,Wu Zhenyu,et al.Slope stability of numerical calculations and geotechnical instability criterion intensity yield criterion[J].Sichuan University(Engineering Science Edition),2014,46(4):6-12.(in Chinese))
[4]Goh A T C.Assessment of basal stability for braced excavation systems using the finite element method[Z].Comp and Geotechnics,1990:10-14.
[5]李亚生,周翠英,张惠明.基于位移突变判据的强度折减法边坡稳定分析[J].人民黄河,2012,34(2):146-148.(Li Yasheng,Zhou Cuiying,Zhang Huiming.Criterion based on the displacement mutation strength reduction of slope stability analysis[J].People Yellow,2012,34(2):146-148.(in Chinese))
[6]郑颖人,赵尚毅.有限元强度折减法在土坡与岩坡中的应用[J].岩石力学与工程学报,2004,23(19):3381-3388.(Zheng Yingren,Zhao Shangyi.Strength reduction FEM in soil and rock slope application[J].Rock Mechanics and Engineering,2004,23(19):3381-3388.(in Chinese))
[7]张爱军,莫海鸿.有限元强度折减法中边坡失稳位移突变判据的改进[J].岩土力学,2013,34(增2):332-337.(Zhang Aijun,Mo Haihong.Strength reduction finite element displacement mutation slope failure criterion[J].Rock and Soil Mechanics,2013,34(Supp.2):332-337.(in Chinese))
[8]古海东,杨敏,孙宽,等.强度折减法在排桩支护结构稳定性分析中的应用[J].地下空间与工程学报,2012,8(6):1168-1172.(Gu Haidong,Yang Min,Sun Kuan,et al.Application of strength reduction method in the row pile supporting structure stability analysis[J].Chinese Journal of Underground Space and Engineering,2012,8(6):1168-1172.(in Chinese))
[9]Schanz T,Vermeer P A,Bonnier P G.The hardening soil model-formulation and verification[Z].Beyond2000 in Computational Geotechnics,Amsterdam,1999:281-296.
[10]徐中华,王卫东.敏感环境下基坑数值分析中土体本构模型的选择[J].岩土力学,2010,31(1):258-264.(Xu Zhonghua,Wang Weidong.Numerical analysis under environmentally sensitive pit Turkey constitutive model selection[J].Rock and Soil Mechanics,2010,31(1):258-264.(in Chinese))
[11]高伟,窦远明,周晓理,等.分步开挖过程中基坑支护结构的变形和土压力性状研究[J].岩土工程学报.2006,8(增1):1455-1459.(Gao Wei,Dou Yuanming,Zhou Xiaoli,et al.Step by step in the process of excavation of foundation pit deformation and earth pressure of retaining structure characters of[J].Chinese Journal of Geotechnical Engineering,2006,28(Supp.1):1455-1459.(in Chinese)).
[12]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座——Ⅱ有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.(Zhao Shangyi,Zheng Yingren,Zhang Yufang.Public lecture of the limit analysis finite element method—ⅡStudy of finite element strength reduction method in the slope instability[J].Rock and Soil Mechanics,2005,26(2):332-336.(in Chinese))
[13]林杭,曹平,宫凤强.位移突变判据中监测点的位置和位移方式分析[J].岩土工程学报,2007,29(9):1433-1438.(Lin Hang,Cao Ping,Gong Fengqiang.Criterion in displacement monitoring point mutation position and displacement mode analysis[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1433-1438.(in Chinese))
[14]张建勋,陈福全.用强度折减有限元法分析土坡稳定问题[J].山东科技大学学报(自然科学版),2004,23(1):115-117.(Zhang Jianxun Chen Fuquan.With strength reduction finite element method analysis of slope stability[J].Shandong University of Science and Technology(Natural Science),2004,23(1):115-117.(in Chinese))
[15]冯虎,刘国彬.考虑工程桩影响软土深基坑隆起破坏的数值模拟研究[J].岩土工程学报,2011,33(增2):314-320.(Feng Hu,Liu Guobin.Consider the impact pile numerical simulation of soft soil foundation uplift damage[J].Chinese Journal of geotechnical engineering,2011,33(Supp.2):314-320.(in Chinese))
[16]徐方京,谭敬慧.地下连续墙深基坑开挖综合特性研究[J].岩土工程学报,1993,5(6):28-33.(Xu Fangjing,Tan Jinghui.Underground continuous wall synthesis characteristics of deep excavation[J].Chinese Journal of Geotechnical Engineering,1993,5(6):28-33.(in Chinese))
[17]张耀东,龚晓南.软土基坑抗隆起稳定性计算的改进[J].岩土工程学报,2006,28(增1):1378-1382.(Zhang Yaodong,Gong Xiaonan.Soft soil foundation heave stability improved computing[J].Chinese Journal of Geotechnical Engineering,2006,28(Supp.1):1378-1382.(in Chinese))
[18]钟艳红.昆明地区深基坑工程的优化设计与研究[D].昆明:昆明理工大学,2012.(Zhong Yanhong.Kunming area deep foundation pit engineering optimization design and research[D].Kunming:Kunming University of Science and Technology,2012.(in Chinese))