静压沉桩对邻近地下连续墙变形的影响
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摘要
以半无限土体中圆孔扩张解答为基础,运用弹性地基梁理论,通过简化基坑内部支撑条件以及墙端约束条件,得到了静压沉桩对邻近基坑地下连续墙变形影响的弹性解答,并分析了沉桩深度和沉桩距离对地下连续墙侧移的影响规律.研究结果表明:静压沉桩对邻近地下连续墙变形有较大影响,尤其对开挖面以下地下连续墙的侧向位移影响更加显著.当沉桩深度超过开挖深度后,地下连续墙产生的位移随沉桩深度不断增加;沉桩超过地下连续墙深度后,继续沉桩对地下连续墙的位移影响逐渐减弱.桩径越大,地下连续墙产生的位移越大.沉桩离地下连续墙越近,地下连续墙产生的位移越大;当沉桩距离增大到15倍桩径时,沉桩影响可以忽略.
Based on the solution to a spherical cavity expansion in semi-infinite soil,an elastic solution or assessing the deflection of the diaphragm wall caused by pile driving is derived by using the elastic foundation beam theory.To determine the supporting condition of the diaphragm wall,simplifications are made to the internal support conditions of the excavation and the constraint conditions at the end of the diaphragm wall.A detailed discussion is conducted to analyze the effects of pile depth and distance between diaphragm wall and pile.The results indicate that pile driving has pronounced effects on the adjacent underground diaphragm wall,especially for the diaphragm wall under the excavation surface.With the increase of pile depth the lateral displacement of diaphragm would be gradually larger after the end of pile below the excavation surface.And when the depth of the pile is more than the depth of the diaphragm wall,the influence on the diaphragm wall will be gradually weakened.The displacement of the diaphragm wall becomes larger with the increase of the pile diameter.The closer the pile is to the diaphragm wall,the greater the displacement of the diaphragm wall is,and when the distance between the pile and the diaphragm wall reaches 15 times of the pile diameter,the effect can be ignored.
Based on the solution to a spherical cavity expansion in semi-infinite soil,an elastic solution or assessing the deflection of the diaphragm wall caused by pile driving is derived by using the elastic foundation beam theory.To determine the supporting condition of the diaphragm wall,simplifications are made to the internal support conditions of the excavation and the constraint conditions at the end of the diaphragm wall.A detailed discussion is conducted to analyze the effects of pile depth and distance between diaphragm wall and pile.The results indicate that pile driving has pronounced effects on the adjacent underground diaphragm wall,especially for the diaphragm wall under the excavation surface.With the increase of pile depth the lateral displacement of diaphragm would be gradually larger after the end of pile below the excavation surface.And when the depth of the pile is more than the depth of the diaphragm wall,the influence on the diaphragm wall will be gradually weakened.The displacement of the diaphragm wall becomes larger with the increase of the pile diameter.The closer the pile is to the diaphragm wall,the greater the displacement of the diaphragm wall is,and when the distance between the pile and the diaphragm wall reaches 15 times of the pile diameter,the effect can be ignored.
引文
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[13]李国维,边圣川,陆晓岑,等.软基路堤拓宽静压PHC管桩挤土效应现场试验[J].岩土力学,2013,34(4):1089-1096.LI Guowei,BIAN Shengchuan,LU Xiaocen,et al.Field test on extruding soil caused of PHC pipe pile driving by static pressure for improving soft foundation of widened embankment[J].Rock and Soil Mechanics,2013,34(4):1089-1096.
[14]孙厚超,李富荣,陆仁艳.沉桩挤土效应对临近基坑影响的试验研究[J].建筑科学,2012,28(9):48-51.SUN Houchao,LI Furong,LU Renyan.Experimental study on effect of pile soil compaction on adjacent foundation pit[J].Building Science,2012,28(9):48-51.
[15]李富荣,周乾,夏前斌,等.软土中静压桩施工对紧邻地下连续墙维护结构的影响[J].科学技术与工程,2013,13(22):6497-6501.LI Furong,ZHOU Qian,XIA Qianbin,et al.The effect on adjacent diaphragm wall retaining structure by static pressure pile construction[J].Science Technology and Engineering,2013,13(22):6497-6501.
[16]李镜培,李林,孙德安,等.饱和软土地层静压沉桩阻力理论研究[J].岩土工程学报,2015,37(8):1454-1461.LI Jingpei,LI Lin,SUN Dean,et al.Theoretical study on sinking resistance of jacked piles in saturated soft clay[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1454-1461.
[17] VESIC A S.Bending of beams resting on isotropic elastic solids[J].Journal of Soil Mechanics and Foundation Engineering,ASCE,1961,87(2):35-53.
[2]李镜培,唐剑华,李林,等.饱和黏土中柱孔三维弹塑性扩张机制研究[J].岩石力学与工程学报,2016,35(2):378-386.LI Jingpei,TANG Jianhua,LI Lin,et al.Mechanism of three dimensional elastic-plastic expansion of cylindrical cavity in saturated clay[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(2):378-386.
[3] CHEN S L,ABOUSLEIMAN Y N.Exact drained solution for cylindrical cavity expansion in modified Cam Clay soil[J].Geotechnique,2013,63(6):510-517.
[4] CHEN S L,ABOUSLEIMAN Y N.Drained and undrained analyses of cylindrical cavity contractions by bounding surface plasticity[J].Canadian Geotechnical Journal,2016,53(5):1398-1411.
[5]解廷伟,左殿军,王绪锋,等.静压桩沉桩过程中地下排污管的动态响应数值分析[J].水利学报,2015,46(S1):168-172.XIE Tingwei,ZUO Dianjun,WANG Xufeng,et al.Numerical study on dynamic response of underground sewage disposal pipe due to pile jacked[J].Journal of Hydraulic Engineering,2015,46(S1):168-172.
[6]张磊,高永涛,吴顺川.静压桩挤土效应对管道的影响研究[J].路基工程,2014(5):40-43.ZHANG Lei,GAO Yongtao,WU Shunchuan.Study on squeezing effect of static pressure pile on pipes[J].Subgrade Engineering,2014(5):40-43.
[7]刘汉龙,金辉,丁选明,等.现浇X型混凝土桩沉桩挤土效应现场试验研究[J].岩土力学,2012,33(S2):219-224.LIU Hanlong,JIN Hui,DING Xuanming,et al.Field test research on squeezing effects of X-section cast-in-place concrete pile[J].Rock and Soil Mechanics,2012,33(S2):219-224.
[8]曹兆虎,孔纲强,刘汉龙,等.基于透明土材料的沉桩过程土体三维变形模型试验研究[J].岩土工程学报,2014,36(2):395-400.CAO Zhaohu,KONG Gangqiang,LIU Hanlong,et al.Model tests on 3-D soil deformation during pile penetration using transparent soils[J].Chinese Journal of Geotechnical Engineering,2014,36(2):395-400.
[9]金国龙,王勇,顾开云.人工挖孔桩施工对紧邻基坑围护结构的影响[J].上海交通大学学报,2012,46(1):84-88.JIN Guolong,WANG Yong,GU Kaiyun.Influence of constructing hand-dug piles closing to retaining wall[J].Journal of Shanghai Jiao Tong University,2012,46(1):84-88.
[10]朱宁.静力压桩引起周围土体变形的理论分析[D].南京:河海大学,2005.ZHU Ning.Theoretical analysis of soil deformation due to piles jacking[D].Nanjing:Hehai University,2005.
[11]饶平平,崔纪飞,赵琳学,等.非轴对称位移边界下球孔扩张挤土位移弹性解答[J].岩土力学,2016,37(4):992-998.RAO Pingping,CUI Jifei,ZHAO Linxue,et al.Elastic solution to the squeezing displacement of spherical cavity expansion under nonaxisymmetric displacement boundary[J].Rock and Soil Mechanics,2016,37(4):992-998.
[12]秦世伟,周艳坤,莫泷.静压桩沉桩施工对临近隧道的影响[J].上海大学学报,2013,19(5):527-533.QIN Shiwei,ZHOU Yankun,MO Long.Influences of driving pile on neighboring tunne[J].Journal of Shanghai University(Natural Science),2013,19(5):527-533.
[13]李国维,边圣川,陆晓岑,等.软基路堤拓宽静压PHC管桩挤土效应现场试验[J].岩土力学,2013,34(4):1089-1096.LI Guowei,BIAN Shengchuan,LU Xiaocen,et al.Field test on extruding soil caused of PHC pipe pile driving by static pressure for improving soft foundation of widened embankment[J].Rock and Soil Mechanics,2013,34(4):1089-1096.
[14]孙厚超,李富荣,陆仁艳.沉桩挤土效应对临近基坑影响的试验研究[J].建筑科学,2012,28(9):48-51.SUN Houchao,LI Furong,LU Renyan.Experimental study on effect of pile soil compaction on adjacent foundation pit[J].Building Science,2012,28(9):48-51.
[15]李富荣,周乾,夏前斌,等.软土中静压桩施工对紧邻地下连续墙维护结构的影响[J].科学技术与工程,2013,13(22):6497-6501.LI Furong,ZHOU Qian,XIA Qianbin,et al.The effect on adjacent diaphragm wall retaining structure by static pressure pile construction[J].Science Technology and Engineering,2013,13(22):6497-6501.
[16]李镜培,李林,孙德安,等.饱和软土地层静压沉桩阻力理论研究[J].岩土工程学报,2015,37(8):1454-1461.LI Jingpei,LI Lin,SUN Dean,et al.Theoretical study on sinking resistance of jacked piles in saturated soft clay[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1454-1461.
[17] VESIC A S.Bending of beams resting on isotropic elastic solids[J].Journal of Soil Mechanics and Foundation Engineering,ASCE,1961,87(2):35-53.