中心排水注浆混凝土桩排水固结特性数值分析
|
摘要
中心排水注浆混凝土桩是一种新型复合加固桩技术,立足珠海淤泥质软土,运用PLAXIS3D有限元,建立在真空负压条件下中心排水注浆混凝土桩单桩复合地基渗流固结计算模型,分析其孔隙水压力分布及消散变化性状,探讨了强度演化规律。结果表明,中心排水注浆混凝土桩具有沿整个桩分布直排式真空负压源的特点,使得中心排水注浆混凝土桩在真空负压条件下桩周软土加固效果显著和加固有效影响范围大,桩周软土随真空负压的加固从正常固结状态变化为超固结状态,强度和刚度得到提高,证实中心排水注浆混凝土桩实施真空负压是一种有效的软基加固手段。
Central drainage grouting concrete pile is a new type of composite pile reinforcement technique,based on muddy soft soil in zhuhai,using PLAXIS3 D finite element,based on the center under the condition of vacuum negative pressure drainage single pile composite foundation seepage consolidation grouting concrete pile calculation model,analysis the characters of pore water pressure distribution and lift change,intensity evolution is discussed.Results show that the central drainage grouting concrete pile has characteristics along the entire pile distribution give expulsion-typely vacuum negative pressure source,making center under the condition of vacuum negative pressure drainage grouting concrete pile pile soft soil reinforcement effect significantly effective influence scope is big,The reinforcement of soft soil with vacuum pressure from normal consolidation state to over-consolidation state.Confirmed that the vacuum drainage of grouting concrete piles in the center is an effective means of strengthening the soft foundation.
Central drainage grouting concrete pile is a new type of composite pile reinforcement technique,based on muddy soft soil in zhuhai,using PLAXIS3 D finite element,based on the center under the condition of vacuum negative pressure drainage single pile composite foundation seepage consolidation grouting concrete pile calculation model,analysis the characters of pore water pressure distribution and lift change,intensity evolution is discussed.Results show that the central drainage grouting concrete pile has characteristics along the entire pile distribution give expulsion-typely vacuum negative pressure source,making center under the condition of vacuum negative pressure drainage grouting concrete pile pile soft soil reinforcement effect significantly effective influence scope is big,The reinforcement of soft soil with vacuum pressure from normal consolidation state to over-consolidation state.Confirmed that the vacuum drainage of grouting concrete piles in the center is an effective means of strengthening the soft foundation.
引文
[1]刘汉龙,赵明华.地基处理研究进展[J].土木工程学报,2016,41(1):96-115.
[2]刘志祥,张海清.PLAXIS3D基础教程[M].北京:机械工业出版社,2015.
[3]唐彤芝,赵维炳,陈俊生,等.高填土路堤荷载下混凝土芯砂石桩复合地基变形与承载力试验研究[J].岩土工程学报,2010,32(12):1829-1836.
[4]叶观宝,张晴雯,赵维炳.混凝土芯砂石桩载荷试验及沉桩数值分析[J].长安大学学报(自然科学版),2015,35(1):41-48.
[5]俞缙,戚志博,蔡燕燕,等.低标号混凝土芯砂石桩复合地基固结计算方法[J].工程力学,2012,29(6):226-231,248.
[6]Montes F,Haselbach L.Measuring Hydraulic conductivity in pervious concrete[J].Environmental Engineering Science,2006,23(12):960-969.
[7]Luck J D,Workman S R,Higgins S F,et al.Hydrologic properties of pervious concrete[M].2006.
[8]Deo O,Sumanasooriya M,Neithalath N.Permeability reduction in pervious concretes due to clogging:experiments and modeling[J].Journal of Materials in Civil Engineering,2010,22(7):741-751.
[9]刘汉龙.岩土工程技术创新方法与实践[J].岩土工程学报,2013,35(1):34-58.
[10]郑刚,龚晓南,谢永利,等.地基处理技术发展综述[J].土木工程学报,2012,20(2):135-154.
[11]陈晓平,黄国怡,梁志松.珠江三角洲软土特性研究[J].岩石力学与工程学报,2003,22(1):137-141.
[12]Brinkgreve R B J.PLAXIS3D手册[M].Nerther Lands:Delft University of Technology,2015.
[13]董志良,陈平山,莫海鸿,等.真空预压下软土渗透系数对固结的影响[J].岩土力学,2010,31(5):1452-1456.
[14]董志良,陈平山,莫海鸿,等.真空预压法有限元计算比较[J].岩石力学与工程学报,2008,27(11):2347-2353.
[15]岑仰润.真空预压加固地基的试验及理论研究[D].杭州:浙江大学,2003.
[16]李广信.高等土力学[M].北京:清华大学出版社,2004.
[2]刘志祥,张海清.PLAXIS3D基础教程[M].北京:机械工业出版社,2015.
[3]唐彤芝,赵维炳,陈俊生,等.高填土路堤荷载下混凝土芯砂石桩复合地基变形与承载力试验研究[J].岩土工程学报,2010,32(12):1829-1836.
[4]叶观宝,张晴雯,赵维炳.混凝土芯砂石桩载荷试验及沉桩数值分析[J].长安大学学报(自然科学版),2015,35(1):41-48.
[5]俞缙,戚志博,蔡燕燕,等.低标号混凝土芯砂石桩复合地基固结计算方法[J].工程力学,2012,29(6):226-231,248.
[6]Montes F,Haselbach L.Measuring Hydraulic conductivity in pervious concrete[J].Environmental Engineering Science,2006,23(12):960-969.
[7]Luck J D,Workman S R,Higgins S F,et al.Hydrologic properties of pervious concrete[M].2006.
[8]Deo O,Sumanasooriya M,Neithalath N.Permeability reduction in pervious concretes due to clogging:experiments and modeling[J].Journal of Materials in Civil Engineering,2010,22(7):741-751.
[9]刘汉龙.岩土工程技术创新方法与实践[J].岩土工程学报,2013,35(1):34-58.
[10]郑刚,龚晓南,谢永利,等.地基处理技术发展综述[J].土木工程学报,2012,20(2):135-154.
[11]陈晓平,黄国怡,梁志松.珠江三角洲软土特性研究[J].岩石力学与工程学报,2003,22(1):137-141.
[12]Brinkgreve R B J.PLAXIS3D手册[M].Nerther Lands:Delft University of Technology,2015.
[13]董志良,陈平山,莫海鸿,等.真空预压下软土渗透系数对固结的影响[J].岩土力学,2010,31(5):1452-1456.
[14]董志良,陈平山,莫海鸿,等.真空预压法有限元计算比较[J].岩石力学与工程学报,2008,27(11):2347-2353.
[15]岑仰润.真空预压加固地基的试验及理论研究[D].杭州:浙江大学,2003.
[16]李广信.高等土力学[M].北京:清华大学出版社,2004.