基于延缓固结法的地基工后沉降控制的数值分析
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摘要
延缓固结法(地基延缓固结处理法)是一种通过限制工程运营期间地基的孔隙压力消散来消除后期的地基固结沉降,从而达到控制地基工后沉降目的的新型地基处理方法。通过设置深层水平防渗层完善了延缓固结法,并以此为基础完成该文的研究工作。有限元模拟计算表明,延缓固结法处理的地基工后沉降随帷幕的深度增加而减小,但是当帷幕达到一定深度以后,再增加帷幕的深度,工后沉降不再减小,而竖向防渗帷幕的深度非常小时,延缓固结法反而会使地基工后沉降加大。采用有限元方法比较了分别采用延缓固结法和刚性桩处理地基的超孔压分布、竖向位移场的分布、沉降时程曲线和控制地基工后沉降的效果,且粗略地比较了二者的经济性能。在竖向防渗帷幕的深度适宜的情况下,延缓固结法控制地基工后沉降的作用确实存在。当处理深度在一定范围之内时,延缓固结法和刚性桩相比具有经济和技术双重优势。
CDM(Consolidation decelerating ground treatment method) is a new ground treatment method which eliminates later ground consolidation settlement and controls the post-construction settlement by confining the pore pressure dissipation of the ground during the operation service period.CDM is refined by setting a deep horizontal anti-seepage layer and the research is based on it.Finite element method calculation shows that the post-construction settlement of ground treated by CDM decreases with the increase of depth of anti-seepage curtain,but no more decrease will occur when anti-seepage curtain is deep enough,while CDM with very shallow anti-seepage curtain results in larger ground post-construction settlement than natural ground.Comparisons of excess pore pressure distribution,vertical displacement field distribution,settlement time process curves and ground post-construction settlement controlling effect between a rigid pile and CDM are made by the finite element method,also,economy of the two methods is compared simply.CDM does can reduce ground post-construction settlement with a feasible depth of the anti-seepage curtain.CDM is better than the rigid pile on economy and technology with the treatment depth within a certain limit.
CDM(Consolidation decelerating ground treatment method) is a new ground treatment method which eliminates later ground consolidation settlement and controls the post-construction settlement by confining the pore pressure dissipation of the ground during the operation service period.CDM is refined by setting a deep horizontal anti-seepage layer and the research is based on it.Finite element method calculation shows that the post-construction settlement of ground treated by CDM decreases with the increase of depth of anti-seepage curtain,but no more decrease will occur when anti-seepage curtain is deep enough,while CDM with very shallow anti-seepage curtain results in larger ground post-construction settlement than natural ground.Comparisons of excess pore pressure distribution,vertical displacement field distribution,settlement time process curves and ground post-construction settlement controlling effect between a rigid pile and CDM are made by the finite element method,also,economy of the two methods is compared simply.CDM does can reduce ground post-construction settlement with a feasible depth of the anti-seepage curtain.CDM is better than the rigid pile on economy and technology with the treatment depth within a certain limit.
引文
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[21]郭秀军,宋克民,张晓培,等.利用双排列CP电阻率测试技术进行垂直铺塑施工质量检测研究[J].岩土力学与工程学报,2005,24(18):3266―3270.Guo Xiujun,Song Kemin,Zhang Xiaopei,et al.Conformation detection of geomembrane vertically laidunderground with two-row CP electrode array[J].Chinese Journal of Geotechnical Engineering,2005,24(18):3266―3270.(in Chinese)
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[2]JTJ017-96,公路软土地基路堤设计与施工技术规范[S].北京:人民交通出版社,1997.JTJ 017-96,Technical specifications for design andconstruction of highway embankment on soft ground[S].Beijing:People’s Communication Press,1997.(inChinese)
[3]铁建设[2004]157,京沪高速铁路设计暂行规定[S].北京:中国铁道出版社,2004.Railway Construction[2004]157,Tentative designspecifications for high-speed railway from Beijing toShanghai[S].Beijing:China Railway Press,2004.(inChinese)
[4]王炳龙,周顺华,杨龙才.高速铁路软土路基工后沉降试验研究[J].同济大学学报,2003,31(10):1163―1167.Wang Binglong,Zhou Shunhua,Yang Longcai.Experimental study on soft soil settlement of high-speedrailway subgrade after construction[J].Journal of TongjiUniversity,2003,31(10):1163―1167.(in Chinese)
[5]杨广庆,刘树山,刘田明.高速铁路路基设计与施工[M].北京:中国铁道出版社,1999.Yang Guangqing,Liu Shushan,Liu Tianming.Designand construction of the high-speed railway subgrade[M].Beijing:Chinese Railway Press,1999.(in Chinese)
[6]屈晓辉.秦沈客运专线主要设计技术[J].铁道科学与工程学报,2004,1(1):32―38.Qu Xiaohui.Main design technology ofQinhuangdao-Shenyang dedicated passenger railway[J].Journal of Railway Science and Engineering,2004,1(1):32―38.(in Chinese)
[7]张诚厚,袁文明,戴济群.高速公路软基处理[M].北京:中国建筑工业出版社,1997.Zhang Chenghou,Yuan Wenming,Dai Jiqun.Softground treatment of highway[M].Beijing:ChineseConstruction Industry Press,1997.(in Chinese)
[8]吴连海,刘远锋.高速铁路松软土地基变形特征及治理技术研究[R].天津:铁道第三勘察设计院,2004.Wu Lianhai,Liu Yuanfeng.Study on deformationcharacteristic and treatment technology for high-speedrailway subgrade on loose ground[R].Tianjin:The ThirdRailway Survey and Design Institute,2004.(in Chinese)
[9]Zayyat M M,Jackson A W,Tanaka T,et al.Foundationsoil improvement using vibro compaction combined withgeo grids[J].Innovations in Grouting and SoilImprovement,2005:212―222.
[10]Plomteux Cyril,Porbaha Ali,Spaulding Charles.CMCFoundation system for embankment support——a casehistory[J].Geo-Support,2004:312―325.
[11]Wong Daniel O,Fitz Patrick Brendan T,Wissmann KordJ.Stabilization of retaining walls and embankmentsusing rammed aggregate piers[J].GeotechnicalEngineering for Transportation Projects,2001,7:1866―1875.
[12]郑刚,刘冬林,顾晓鲁.预置劲芯夯实水泥土桩及其施工方法[P].中国:ZL200410093879.5,2004-12-9.Zheng Gang,Liu Donglin,Gu Xiaolu.Tamped cementsoil pile with preinstalled rigid core and its constructionmethod[P].China:ZL 200410093879.5,2004-12-9.(inChinese)
[13]郑刚,顾晓鲁,刘冬林.桩顶设置完全柔性桩垫的复合地基和复合桩基及其施工方法[P].中国:ZL200410093878.0,2004-12-9.Zheng Gang,Gu Xiaolu,Liu Donglin.Compoundfoundation and compound pile foundation with entireflexible mat on the top of the piles and its constructionmethod[P].China:ZL 200410093878.0,2004-12-9.(inChinese)
[14]徐士龙.快速“高真空击密法”软地基处理工法[P].中国:ZL01127046.2,2001-07-28.Xu Shilong.Fast high vacuum densification method forsoft ground treatment[P].China:ZL 200410093879.5,2004-12-9.(in Chinese)
[15]刘汉龙,马晓辉,宫能和.软基处治大直径现浇管桩复合地基施工方法[P].中国:ZL02112538.4,2002-1-14.Liu Hanlong,Ma Xiaohui,Gong Nenghe.Constructionmethod for compound foundation on soft ground treatedwith large diameter pipe pile casted in situ[P].China:ZL02112538.4,2002-1-14.(in Chinese)
[16]刘远锋.地基延缓固结处理法[P].中国:ZL03130321.8,2003-6-30.Liu Yuanfeng.Consolidation decelerating groundtreatment method[P].China:ZL 03130321.8,2003-6-30.(in Chinese)
[17]曹宏德.垂直防渗技术进展探讨[J].人民珠江,2001(1):42―44.Cao Hongde.Discussion on evolvement of verticalseepage control technique[J].Pearl River,2001(1):42―44.(in Chinese)
[18]杨国顺,刘伟,党爱琴.垂直防渗单价初析[J].水利科技与经济,2002,8(3):151―152.Yang Guoshun,Liu Wei,Dang Aiqin.The preliminaryunit price analysis of the vertical seepage control for thedyke[J].Water Conservancy Science and Technologyand Economy,2002,8(3):151―152.(in Chinese)
[19]陶秀玉,乔建利,张立新,等.垂直铺塑防渗技术及其应用[J].山东水利科技,1995(1):24―29.Tao Xiuyu,Qiao Jianli,Zhang Lixin,et al.Technologiesand its application of seepage control by verticallyplacing geomembrane[J].Water Resources Science andTechnology of Shandong,1995(1):24―29.(in Chinese)
[20]刘宾,李洪德,赵明杰.高密度电法在地下防渗墙检测中的应用[J].华北地震科学,2004,22(4):50―52.Liu Bin,Li Hongde,Zhao Mingjie.Application of highdensity electric method in the detection of undergroundanti-seepage walls[J].North China Earthquake Sciences,2004,22(4):50―52.(in Chinese)
[21]郭秀军,宋克民,张晓培,等.利用双排列CP电阻率测试技术进行垂直铺塑施工质量检测研究[J].岩土力学与工程学报,2005,24(18):3266―3270.Guo Xiujun,Song Kemin,Zhang Xiaopei,et al.Conformation detection of geomembrane vertically laidunderground with two-row CP electrode array[J].Chinese Journal of Geotechnical Engineering,2005,24(18):3266―3270.(in Chinese)
[22]史晓慧.坡积土湿化变形试验与数值模拟[D].南京:河海大学,2008.Shi Xiaohui.Wetting deformation test and numericalsimulation of slope-wash-soil[D].Nanjing:HohaiUniversity,2008.(in Chinese)
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