用户名: 密码: 验证码:
水泥土搅拌法(MIP)加固斜坡软弱土地基的工程特性试验研究
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
水泥土搅拌法在20世纪50年代初美国首先研制而成,经过几十年的研究和发展,现在已广泛应用于各国的港湾建设等土木工程建设之中。目前对水泥土搅拌桩的各项力学特性及影响因素已有较深入的研究,但对水泥土搅拌桩复合地基的作用机理理论尚不成熟,还需要进一步研究。国内外对斜坡软弱土地基的研究还在起步阶段,对斜坡软弱土地基的破坏机理认识还不足。
     为充分掌握斜坡软弱土地基在路堤荷载作用下的变形特性,寻求合理的地基加固措施,在新建达成铁路扩能改建工程某工点进行现场测试研究,并以此为原型,设计了6组基于水泥土搅拌法地基处理方案的室内土工离心模型试验。通过对实验数据的整理分析,有以下主要结论:
     1)针对斜坡软弱土地基的上、下坡侧分别采取不同的桩间距布设,可减小斜坡软弱土地基沿横向的差异沉降变形,提高地基加固的均匀性;
     2)在斜坡软弱土地基的下坡一侧布设斜桩,具有较好的水平变形约束效果,但在竖向沉降控制方面表现略差;
     3)斜坡软弱土地基下坡一侧产生的变形将引起上坡一侧产生相同方向的变形,并以水平变形的表现较明显,地基加固应以控制下坡一侧的变形为重点:
     4)地基水平变形沿深度的变化规律因地基布桩疏密的不同而表现出先增后减的单峰型曲线和单调衰减的双曲线型两种形态。为充分掌握斜坡软弱土地基在路堤荷载作用下的承载特性,给斜坡软弱土地基的设计提供合理的设计参数。
     5)斜坡软弱土地基在构造上存在的不均匀性对路堤基底压力分布和桩土荷载分担等力学响应有明显影响,并随软弱土层厚度的增加产生一定的卸载效应和加剧桩土压力的调整;
     6)采用“上疏下密”不等间距的布桩模式,能调整桩土压力的分布,更好地适应地基软弱土层厚度的变化,提高地基加固的均匀性;
     7)加筋垫层筋带拉力受路堤荷载、软弱土层厚度和桩体布置间距等因素的共同影响,分布形态表现出显著的不对称性特点,最大值出现部位与斜坡软弱土地基可能产生的变形破坏位置有良好的一致性。
Mixed-in-Place pile was first developed successfully in the United States at the beginning of 1940s, after decades of research and development, which has been widely used in Civil engineering, such as the Harbor construction, in many countries. At present, it has been intensively studied about the mechanical properties and influencing factors of the cement -soil mixing pile, but the theory of the mechanism on composite foundation of the cement -soil mixing pile has not mature, which needs to further study. The research on slope soft-soil foundation is in initial stage, and the understanding on the failure mechanism of slope soft-soil foundation is inadequate.
     In order to fully master the deformation characteristics of slope soft-soil foundation under loads of embankment and find to reasonable strengthening measures of the foundation, there's a field test at a research site in new-building capacity expansion and conversion project between DAZHOU and CHENGDU. This essay uses the above project as a prototype, and designs 6 groups indoor geotechnical centrifuge model tests based on the foundation processing program of the Mixed-in-Place pile. Through the collation and analysis of the experimental data, the main conclusions are as follows:
     1)By adopting different pile spacing layout style at the upside and downside direction of the slope, it can reduce the differ deformation of the slope soft-soil foundation along the lateral side and improve the uniformity of the foundation treatment;
     2) It has better deformation binding effect by setting up the tilted pile in the downhill side of the slope soft-soil foundation, but it has less effective performance in controlling the vertical subsidence;
     3) The slope soft-soil foundation deformation that appeared at the downhill side will give rise to the same direction deformation at the uphill side, and the horizontal deformation is more obvious. The foundation treatment should put emphasis on the deformation controlling of downhill side;
     4)The varying law about horizontal deformation along the depth direction shows para-curve style which is first adding then reducing and hyperbola style that is humdrum reducing, attribute to the density of the pile layout.
     5) The non-uniformity of the slope soft-soil foundation in the structure has significantly effects on the mechanical response of the foundation, such as the pressure distribution and load-sharing;
     6) The use of the varying pile spacing mode can adjust the distribution of pile-soil pressure, and better adapt to the change of the thickness of the soft-soil foundation and improve the uniformity of foundation strengthening;
     7)The pulling force of the reinforced cushion geobelt is combined effected by many factors, such as the embankment loading, the thickness of soft-soil foundation and pile spacing arrangement. The distribution patterns has significant feature of the asymmetry. There is good consistency between the appearing position of the maximum value and the possible deformation location of the slope soft-soil foundation.
引文
[1]王其昌.高速铁路土木工程[M].成都:西南交通大学出版社,1999
    [2]杨顺安,冯晓腊,张聪辰.软土理论与工程.北京:地质出版社,2000:1~4.
    [3]吴邦颖,张师德,陈绪禄等.软土地基处理.北京:中国铁道出版社,1995:1~11.
    [4]交通部第一公路勘察设计院.公路软土地基路堤设计与施工技术规范.北京:人民交通出版社,1996.
    [5]交通部公路规划设计院.公路工程名词术语.北京:人民交通出版社,1996.
    [6]建设部综合勘察研究设计院.岩土工程勘察规范.北京:中国建筑工业出版社,2001.
    [7]高宏兴.软土地基加固.上海:上海科学技术出版社.1990:3-8.
    [8]中国建筑科学研究院.建筑地基基础设计规范.北京:中国建筑工业出版社,2002.
    [9]铁道部第四勘测设计院,朱梅生.软土地基.北京:中国铁道出版社,1989:1~11.
    [10]铁道部第一勘测设计院.铁路工程设计技术手册(路基).北京:中国铁道出版社,1992.
    [11]崛和英等.软土地基处理.张文全,王运实译校.人民交通出版社,1982:1~5.
    [12]嘉运.岩土工程及路基.北京:中国铁道出版社.1997:128~129.
    [13]苏宁沪高速公路股份有限公司,河海大学.交通土建软土地基工程手册.人民交通出版社,2001.
    [14]裴富营.客运专线高强度桩复合地基承载特性试验研究[D].西南交通大学博士学位论文,2009.
    [15]河海大学编.交通土建软土地基工程手册[M]北京:人民交通出版,2001,3.
    [16]叶书麟,叶观宝.地基处理与托换技术[M]北京:中国建筑工业出社,2005.
    [17]刘玉卓.公路工程软基处理[M]北京:人民交能出版社,2002,1.
    [18]David S.Yang,Jack N,Yagihashi et al.Dry Jet Mixing for Stabilization of Very Soft Soils and Organic Soils[J].Soil Improment for Big Digs:96-103.
    [19]童小东.水泥土添加剂及其损伤模型试验研究[D].浙江大学博士学位论文.1998.
    [20]徐至钧,曹名葆.水泥土搅拌法处理地基[M].北京:机械工业出版社,2004:9-18.
    [21]叶观宝.地基加固新技术[M].北京:机械工业出版社,2004:124-153.
    [22]《地基处理手册》编写委员会.地基处理手册[M].北京:中国建筑工业出版社,1988:399-414.
    [23]Suksun Horpibulsuk.Analysis and Assessment of Engineering Behavior of Cenment Stabilized Clays[D].SagaUniversity,Saga,JaPan,SePtember 2001,12-14.
    [24]铁道部第四勘察设计院主编.TB10113-96粉体喷搅法加固软弱土层技术规范[S].北京:中国铁道出版社,1996.
    [25]#12
    [26]梁仁旺,张明,白晓红.水泥土的力学性能试验研究.岩土力学,2001,22(2):211-213.
    [27]郑刚,陈辉.型钢水泥土组合梁抗弯模型试验的有限元分析.建筑科学,2003,19(4):39-42.
    [28]UddinK,Balasubramaiam A.S.and Bergado D.T.Engineering behavior of cement-treated Bankok soft clay[J].Geotechnical Engineering(Bangkok),28,NO.1,1997,89-119.
    [29]汤怡新,刘汉龙,朱伟.水泥固化土工程特性试验研究[J].岩土工程学报,2000,22(5):549-554.
    [30]贾坚.竹筋水泥土搅拌桩挡土墙的试验研究与分析[D].同济大学硕士研究生论文,1991.
    [31]崔江余.深层搅拌桩桩体材料力学性能分析[J].地基基础工程,2001,11(4).
    [32]林鹏,许淑贤,许镇鸿.软土地基水泥土的室内强度试验分析[J].西部探矿工程,2002,(4):6~7.
    [33]Kawasaki T.,Suzuki Y.On The Deep Mixing Chemicao Mixing Method Using Cement Hardening Agent[C].Takenaka.Technical Research Report 26,1981,13-42.
    [34]郭宏峰.有机质对水泥土强度影响的机理研究[D].同济大学硕士研究生论文,2008.
    [35]Miura,N.,Taesiri,Y.,Koga,Y.and Nishida,K.Practice of Improvement of Ariake Clay by Mixing Admixtures[C].Proceedings of the International Symposium On Shallow Sea and Low Land,Saga University,Saga,JaPan,1998,159-168.
    [36]肖林,王春义,郭汉生.建筑材料水泥土[M].北京:水利电力出版社,1987,30-61.
    [37]张家柱,程钊,余金煌.水泥土性能的实验研究.岩土工程技术,1999,No.3:38~40.
    [38]林琼等.水泥搅拌桩在深基坑支护结构中的应用研究.福建省建筑科学研究院,1994
    [39]栾晶晶.高含水率水泥土的力学特性的试验研究[D].天津大学硕士研究生学位论文,2005.
    [40]Babasaki R.and Suzuki,k.,Open cut excavation of soft ground using the DCM method[C].Proceedings of International Conference on Ground Improvement Geosystems,IS-Tokyo'96,VOL.1,469-473.
    [41]Bengt B.Broms,Design of lime,lime/cement and cement columns,Dry Mix Mwthods foe Deep Soil Stabilization[M],Bredenberg,Holm & Broms,Balikema,Rotterdam.1999.125-151.
    [42]段继伟等.水泥搅拌桩的荷载传递规律.岩土工程学报,1994,7,16(4):1-8.
    [43]何开胜,徐立新.超长水泥搅拌桩的荷载传递特性.建筑结构,2000,5,30(5).
    [44]马时冬.水泥搅拌桩复合地基桩土应力比测试研究[J].土木工程学报,2002,35(2):48-51.
    [45]赵东亮.水泥搅拌桩桩长的优化设计[J].岩土工程技术,2002,(1):18-22.
    [46]李二兵,丁娜娜,谭跃虎.软土水泥搅拌桩复合地基沉降分析与控制[J].建筑技术,2004,35(3):171-172.
    [47]张华丰.水泥土搅拌桩有效桩长分析.广东工业大学硕士研究生学位论文,2006.
    [48]杨志华.水泥土搅拌桩复合地基震动性能时程分析[D].大连理工大学硕士学位论文,2006.
    [49]付全成.水泥搅拌桩复合地基加固软基性状的试验研究[D].河海大学硕士学位论文,2006.
    [50]马海龙,陈云敏.水泥土桩桩土应力分担及曲线形式研究[J].岩石力学与工程学报,2006,25(增2):4112-4119.
    [51]朱丽霞.柔性基础下水泥土桩复合地基力学性质研究[D].苏州科技学院硕士学位论文,2008.
    [52]吴家府.水泥土搅拌法处理软基双控优化设计方法[D].同济大学硕士学位论文,2008.
    [53]魏永幸.内昆铁路李子沟斜坡软土特性及路基工程对策[J].地质灾害与环境保护.2000,11(2):104-106.
    [54]魏永幸.基于填方工程的斜坡软弱地基及其成因[J].地质灾害与环境保护.2006,17(1):58-63.
    [55]魏永幸,罗强,邱延峻.斜坡软弱地基填方工程特性及工程技术研究[J].铁道工程学报.2006,(9):10-15.
    [56]张良,魏永幸,罗强.基于离心模型试验的斜坡软弱土地基路堤变形特性研究[J].铁道建筑技术.2004,(1):51-53.
    [57]张良,魏永幸,罗强.基于离心模型试验的斜坡软弱土地基路堤加固方案研究[J].铁道工程学报.2004,(1):73-76.
    [58]张良.斜坡软弱土地基路堤的工程特性研究[D].西南交通大学硕士学位论文.2003.
    [59]蒋鑫,魏永幸,邱延峻.斜坡软弱地基填方工程数值仿真[J].交通运输工程学报.2002,2(3):41-46.
    [60]蒋鑫,魏永幸,邱延峻.斜坡软弱地基路堤填筑全过程稳定性[J].交通运 输工程学报.2003,3(1):30-34.
    [61]蒋鑫,魏永幸,邱延峻.基于强度折减法的斜坡软弱地基填方工程特性分析[J].岩土工程学报.2007,29(4):622-627.
    [62]丁秀美.西南地区复杂环境下典型堆积(填)体抖坡变形及稳定性研究[D].成都理工大学博士学位论文.2005.
    [63]Craig.W.H,Edouard Phillips and the idea of centrifuge modeling[J],Geotechnique,1989(39):679~700.
    [64]左东启等.模型试验的理论与方法[M].北京:水利水电出版社.1984
    [65]Bucky,P.B,The use of models for the study of mining problems[J],Am.Inst.Met.Eng.Tech.Pub,1931,425,28~30.
    [66]朱维新.土工离心模型试验研究概况[J],岩土工程学报,1986,8(2).
    [67]R.N.Taylor(ed),Geotechnical Centrifuge Technology,1995,Blachie Academic and Professional
    [68]张炜,土工离心模型试验技术综述[J],军工勘察,1994,No1,16~22.
    [69]杜延龄,LXJ-4-450土工离心模型试验机的研制,水利学报,1992(2).
    [70]Dou.Y.Jing.P.Development of NHRI-400g.t Geotechnical Centrifuge[A],Centrifuge 94[C],Singapore,Leung,Lee&Tan(eds),69~74.
    [71]袁文忠.相似理论与静力学模型试验[M].西南交通大学出版社,1998.
    [72]陈丛新.边坡稳定离心模型试验中离心力分布不均匀的影响.岩土力学.1994,15(4):39-46.
    [73]曾友金,王年香,章为民等.软土质地区微型桩基础离心模型试验研究[[J].岩土工程学报,2003,25(2):242-245.
    [74]王元勋.土质边坡稳定性分析的离心模型试验研究.[学位论文1.成都:西南交通大学.2003.
    [75]侯瑜京.高土石坝离心模型试验技术及位移反分析研究[D].中国水利水电科学研究院博士论文,1996年
    [76]包承刚,饶锡保.土工离心模型试验原理[J].长江科学院院报,1998,15(2):2~7
    [77]Malushitsky.Y.N.The Centrifuge Model Testing of Waste-heap Embankments[D].London:Cambridge University Press,1975:5~11
    [78]Santamarina.J.C,Goodings.D.J,Centrifuge Modeling:a Study of Similarity[J].Geotechnical Testing Jr,1989,12(2):163~166
    [79]Ovesen.N.K,The Use of Physical Models in Design:the Scaling Law Relationships[A].7th European Conf.on Soil Mechanics and Foundation Engineering.Brighton[C],1979,4:318~323.
    [80]徐光明,章为民.离心模型中粒径效应和边界效应研究[J],岩土工程学报,1996,18(3):80~86.
    [81]濮家骝.土工离心模型试验及其应用的发展趋势[J].岩土工程学.1996,18(5):92~94
    [82]Randolph MF.E stablishing a New Centrifuge Facility.Centrifuge91,Ko (ed),Balkema,Rotterdam,1991:3~9.
    [83]FuglsangLD,Ovesen NK.The Application of the Theory of Modelling to Centrifuge Studies.Centrifuge in Soil Mechanics,1988
    [84]多贺谷宏三,ScottRF,纲干寿夫.Scale Effect in An~chor Pullout Test by Centrifugal Technique.土质工学会论文报告集.1988,28(3)
    [85]NgCWW,VanLaakP,TangWHetal.The Geotchnical Centrifuge Facility in Hong Kong.Second China~Japan Joint Symposiumon Recent Development of Theory and Practice in Geotechnology,1999,11:327~335
    [86]白冰,周健.土工离心模型试验技术的一些进展[J].大坝观测与土工测试.2001,25(1):36~39
    [87]CRAIG W H.Installation studies for model piles[C]// Proceedings of Symposium on the Application of Centrifuge Modeling to Geotechnical Design.Manchester:1984,440-455.
    [88]南京水利科学研究院土工研究所.土工试验技术手册[M].北京:人民交通出版社,2003.
    [89]Hon-Yim Ko,Atkinson R H,Goble G G,Carl D.Ealy.Centrifugal modeling of pile foundation[C]// Joseph RayMeyer.Analysis and Design of Pile Foundantion.American Society of Civil Engineers,1984.21-40.
    [90]杨有海,陶天森,郭建群等.水泥土挤密桩复合地基桩土压力比的现场测 试研究[J].铁道学报,2008,30(3):91-95.
    [91]秦然,陈征宙,董平.水泥土桩复合地基桩土压力比的一种解析算法[J].岩土力学,2001,22(1):96-98.
    [92]刘俊新,谢强,文江泉等.粉喷桩-土工格栅复合地基应力现场测试研究[J].岩土力学,2007,28(2):376-380.
    [93]李国维,杨涛.柔性基础下复合地基桩土应力比现场试验研究[J].岩土力学,2005,26(2):265-269.
    [94]吴慧明,龚晓南.刚性基础与柔性基础下复合地基模型试验对比研究[J].土木工程学报,2001,34(5):81-84

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700