现浇混凝土薄壁管桩加固软基机理和沉降计算方法研究
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摘要
现浇混凝土薄壁管桩(简称PCC桩)及其复合地基是一种全新的地基处理新技术,已应用于高速公路、民用建筑、港口、海堤等工程建设中,PCC桩在处理效果、工期、造价、环保等方面具有较大的优越性,因此在地基处理中具有广阔的应用前景。本文在借鉴其他桩型的研究的基础上,通过现场试验研究和理论推导,对PCC桩处理软基加固机理、沉降计算和优化设计等进行了较为深入的研究和探讨,具体包含以下几方面的内容:
     (1) 在与预制管桩和沉管灌注桩等桩型比较的基础上,对PCC桩的优缺点、施工机具设备、施工工艺、技术作用机理以及PCC桩复合地基技术特点等进行了述评。
     (2) 进行了PCC桩及其复合地基现场试验研究,对PCC桩及其复合地基加固机理进行简要分析。
     (3) 基于PCC桩—土—垫层所组成的一个工作体系,综合考虑各部分的工作特性及相互影响,对PCC桩进行整体分析,建立桩体平衡方程,考虑PCC桩在褥垫层及下卧层中的上、下刺入量对复合模量的影响,并通过迭代的方法最后确定桩体模量发挥系数,提出了一种求解PCC桩复合地基模量的计算方法,进而得到PCC桩复合地基的沉降计算和桩土应力比公式。并运用工程实例进行了验证,与实际情况符合较好。
     (4) 根据本文建立的沉降计算方法,对复合地基模量的主要影响因素:置换率、褥垫层弹模、桩体模量、基床系数等进行探讨,最后得出了它们和复合地基模量之间的关系曲线。
     (5) 建立了PCC桩复合地基优化设计的目标控制函数和两个约束条件:沉降控制条件和承载力校核条件。并根据对PCC桩复合地基影响因素的讨论,对PCC桩复合地基设计参数的设计进行了讨论,提出了相应的优化设计方法和具体实施步骤。
As a new foundation improvement technology, The cast-in-situ concrete thin-wall pipe pile (PCC pile) is applied widely in the construction of the highway, civil architecture, haven and sea embankment etc. The PCC pile has a great prospect because it has superiority in the treatment of soils, such as construction period, cost and environment protection. Based on the study idea of the former pile else, this paper has conducted and discussed the mechanism of consolidation, settlement calculation and optimization design of the PCC pile according to the test in situ results and reasoning. It includes the followings in detail:
    (1) Compared with the precast tube concrete pile and tube sinking concrete pile, the merits and shortages, construction machine, construction technology of the PCC pile and PCC pile composite foundation are introduced in detail to make the PCC pile be known completely by engineers.
    (2) The test of the PCC pile and its composite foundation in situation is carried out and the consolidation mechanism was discussed according to result of the test in situation.
    (3) Based on the working performance and mutual influence of the system of PCC pile-soil-cushion, PCC pile composite foundation is discussed in elastic method. A new calculation method of composite modulus of the PCC pile composite foundation is developed. Furthermore, Pile-soil stress ratio and settlement can be derived from the proposed method in this paper. Finally, it is proved the method is practicable and applicable in the field by a practical engineering.
    (4) According to the settlement calculation method in this paper, the main influence factors, such as displacement ratio, modulus of cushion, modulus of pile, and coefficient of subgrade, are discussed in this paper and the curves that reflect the relationships of the composite modulus and the influence factors have been achieved.
    (5) The governing object function and two boundary condition: settlement and foundation bearing capacity are developed in the optimization design of the PCC pile composite foundation. The design parameters of the PCC pile composite foundation are discussed and then the optimization design method and process is developed.
引文
1、Burland J. The stabilization of the leaning tower of pisa. Proceeding of the fourth Qian Jiahuan Seminar on Geotechnical Engineering[M],2002,Nanjing.
    2、杨永浩.苏州虎丘塔地基加固,第四届土力学及基础工程学术会议论文集[M],中国建筑工业出版社,1986.
    3、蔡家范,许道化,柯弘生,徐泽中等,沪宁高速公路软土地基综合处理技术研究和实践.水利水电科技进展[J],1998,18(2):1~5.
    4、(JGJ79-91)建筑地基处理技术规范[M].中国建筑工业出版社,1992.
    5、刘景政等,地基处理与实例分析[M].中国建筑工业出版社,1998.
    6、刘汉龙,费康,马晓辉,高玉峰.振动沉模大直径现浇薄壁管桩技术及其应用(Ⅰ开发研制与设计理论)[J].岩土力学,2003,24(2):163~167.
    7、刘汉龙,郝小员,费康等.振动沉模大直径现浇薄壁管桩技术及其应用(Ⅱ工程应用与现场试验)[J].岩土力学,2003,24(3):372~375.
    8、龚晓南,复合地基理论及其工程应用[M].中国建筑工业出版社,2001.
    9、阎明礼,张东刚,CFG桩技术及其原理[M].中国水利水电出版社,2000.
    10、周平,陈善雄,用低标号素混凝土桩复合地基处理不均匀软土地基[J].土工基础,2000,14(2):5~9.
    11、宰金珉,桩土明确分担荷载的复合桩基及其设计方法[J],建筑结构学报,1995,16(4):66~74.
    12、Canetta, G. & Nova, R., A numerical Method for the analysis of ground improved by columnar inclusions[J].Computers Geotech, 1989 , No 7, 7~21.
    13、饶为国,赵成刚.复合地基工后沉降的薄板变形模拟[J].应用力学学报,2002,19(2):133~136.
    14、饶为国,江辉煌,候庆华.桩—网复合地基工后沉降的薄板模拟理论解[J].水利学报,2001,4:23~27.
    15、J.T. Shahu, M. R. Madhav and S. Hayashi. Analysis Granular Pile-Mat System for Soils With Shift Crust[J]. Geotechnical Engineering Journal,Vol.31 ,No. 1,Apail,2000,1~15.
    16、J.H. Yin. Application of Timoshenko Beam Theory to Modeling Geosynthetic-Reinforced Granular Base over Soft Ground[J]. Geotechnical Engineering Journal,Vol.31 ,No. 1 ,Apail,2000,17~27.
    17、J. Han, S.L. Shen, J.S.Yang, L.Yan. Geosynthetic-Reinforced and Pile-Supported Embankments[J].
    18、J. Han, M, A, Gabr, Numerical Analysis of Geosynthetic-Reinforced and Pile-Supported Earth Platforms over soft soil[J]. Journal of Geotechnical and Geoenvironmental Engineering. Vol.128, No. 1, January 1,2002.ASCE ,44~53.
    19、池跃君,宋二祥,高文新.刚性桩复合地基承载及变形特性试验研究[J].中国矿业大学学报,2002,31(3):237~241.
    
    
    20、池跃君,宋二详等.刚性桩复合地基应力场分布的试验研究[J].岩土力学,2003,24(3):339~343.
    21、池跃君,沈伟,宋二祥.垫层破坏模式的探讨及其与桩土应力比的关系[J]、工业建筑,2001,31(11):9~11.
    22、Michael W. O'Neill and Richard D. Raines. Load transfer for pipe pile in highly pressured dense sand[J]. Journal of Geotechnical Engineering, vol. 117, No.8, August, ASCE(1991), 1208~1227.
    23、B.M. Lehane and M. F. Randolph. Evaluation of a minimum base resistance for driven pipe piles in siliceous sand[J]. Journal of Geotechnical and Geoenvironmental Engineering,vol. 128,No.3,March, ASCE(2002), 198~205.
    24、Kyubo Paik and Rodrigo Salgado, M. Determination of bearing capacity of open-ended piles in sand[J]. Journal of Geotechnical and Geoenvironmental Engineering, vo1.129, No.1, January, ASCE(2003),46~47.
    25、Kenneth G. Gavin and Barry M. Lehane. The shaft capacity of pipe pile in sand. Can. Geotech. J. Vol.40,2003,36~45.
    26、M.F. Randolph & C.P. Wroth, An analysis of the vertical deformation of pile groups[J], Geotechnique, 1979,Vol29,No.4,101~122.
    27、金波,李志飙,顾尧章,层状地基中的单桩沉降分析[J].岩土工程学报,1997,19(5):35-41.
    28、罗晓辉,桩的荷载传递机理分析[J].岩土工程技术,1999,N03:16~20.
    29、殷宗泽,朱泓,许国华.土与结构材料接触面的变形及其数学模拟[J].岩土工程学报.1994,16(3):14~22.
    30、陈开旭,安关峰,鲁量.采用有厚度接触单元对桩基沉降的研究[J].岩土力学,2000,21(1):92~96.
    31、Bransby, M.F. Springman,s.m. 3-D finite element modelling of pile groups adjacent to surcharge loads[J]. Computers and Geotechnics, 1996,19(4),301-324
    32、段继伟,龚晓南,曾国熙.复合地基桩土应力比影响因素有限元分析[J].第二届华东地区岩土力学学术讨论会论文集.浙江大学出版社,1992:43~47.
    33、杨涛,殷宗泽.复合地基沉降的复合本构有限元分析[J].岩土力学,1998,19(2):19~25.
    34、李宁,韩煊.复合地基中褥垫作用机理研究[J].岩土力学,2000,21(1):10~15.
    35、李宁,韩煊.单桩复合地基加固机理数字试验研究[J].岩土力学,1999,20(4):42~49.
    36、《桩基工程手册》编写委员会,桩基工程手册[M],1995.
    37、中华人民共和国行业标准,建筑桩基技术规范(JGJ94—94)[M].1995.
    38、Poulous, H.G. Pile behaviour-theory and application[J],Geotechnique, 1989,39, No,3,365~415.
    39、振动沉模大直径现浇管桩技术及其应用研究报告[R],河海大学,2002.
    40、(JGJ79-91)建筑地基处理技术规范[M].中国建筑工业出版社,1992.
    41、二滩水电,岩土工程安全检测手册[M].中国水利水电出版社,1999.
    42、姜朴,现代土工测试技术[M].中国水利水电出版社,1997.
    43、建筑地基基础设计规范(GBJ7-89)[M].中国建筑工业出版社,1989.
    44、龚晓南.有关复合地基的几个问题.地基处理[J].2000,11(3):42~48.
    45、闫雪峰,闫明礼.复合地基沉降计算的复合模量探讨[J].2000,第六届全国地基处理学术讨论会
    
    暨第二届全国基坑工程学术会论文集.
    46、张雁,黄强.半刚性桩复合地基性状分析[J].岩土工程学报,1993,15(2):86~92.
    47、邹坚,深搅桩复合地基的计算理论及其应用研究[D].河海大学硕士学位论文,2001.
    48、张小平,余仲泉.用Mindlin解推求复合地基中的附加应力的计算公式[J].河海大学学报,1999,27(3):35~38.
    49、Geddes d. Stress in foundation soils due to vertical subsurface loading[J].geotechnique, 1966, 16(3),231-255.
    50、张土桥,水泥土的应力应变关系及搅拌桩破坏特性研究[D].浙江大学博士学位论文,1992.
    51、徐洋,卢廷浩.考虑沉桩及群桩间相互影响的复合模量计算方法[J].岩土力学,2001,22(4):486~489.
    52、周建,复合地基加固区沉降计算的一种新方法[J].浙江大学学报,2000,34(1):83~87.
    53、付景辉,宋二祥.刚性复合地基工作特性分析[J].岩土力学,2000,21(4):335—339.
    54、章胜南.搅拌桩复合地基桩土应力比探讨[J].地基处理,1995,6(2):9—14
    55、Ronald Y.S. Pak & Feng J.(1993). Rational mechanical of axial soil-pile interaction[J]. Journal of Engineer Mechanics, 1993,119(4),813~831.
    56、毛前,龚晓南.桩体复合地基柔性垫层的效用研究[J].岩土力学,1998,19(2):67—73.
    57、杭宁高速科研项目组.现浇砼薄壁桶桩加固桥头软基试验研究报告[R].2001.
    58、周景星等.基础工程[M].北京:清华大学出版社,1996.
    59、华南理工大学等.地基及基础[M].北京:中国建筑工业出版社,1991.
    60、汪树玉主编,优化方法及其在水工中的应用[M],水利电力初版社,1993.
    61、刘利民,程庆阳,张洪文等,以沉降控制为标准的水泥土搅拌桩设计方法的研究[J].工业建筑,1997,27(3):9~13.
    62、福克斯(美)著,张建中,诸梅芳译,工程设计的优化方法[M].科学初版社,1981.
    63、汪树玉等,优化原理方法和工程应用[M].浙江大学出版书,1991.
    64、Jardine R.J., Potts D.M., Fourrie A.B.& Burland J.B..Studies.of the influence of non-linear stress-strain characteristics in soil-structure interaction[J]. Geotechnique, 1986, 36(3), 377—396.
    65、周成,明经平,方永凯.桩间软土加固效果分析及其极限承载设计[J].岩土工程学报,1999,21(3):370~373.
    66、秦然,陈征宙,董平.水泥土桩复合地基桩土应力比的一种解析法[J].岩土力学,2001,22(1):96~98.
    67、Ronald Y.S. Pak & Feng J.(1993). Rational mechanical of axial soil-pile interaction[J]. Journal of Engineer Mechanics[J],1993,119(4):813~831.
    68、Jardine R.J., Potts D.M., Fourrie A.B.& Burland J.B.Studies of the influence of non-linear stress-strain characteristics in soil-structure interaction[J],1986,36(3),377~396.
    69、Guo,W.D.& Radolph,M.F(1989). An efficient approach for settlement prediction of pile groups[J]. Geotechnique 49,No,2,161~179.
    70、S.L. Lee. Y. C. Kog, and G.. P. Karunaratne. Axially loaded pile in layered soil[J]. Journal of
    
    Geotechnical Engineering,vol. 113,No.4,April, ASCE(1987),366~381.
    71、C. Y. Lee. Settlement of pile groups-practical approach[J]. Journal of Geotechnical Engineering,vol. 119, No.9, september, ASCE(1993), 1449~1461.
    72、H. B. Poorooshasb, M.Alamgir and N.Miura. Negative skin fiction on rigid and deformation piles[J]. Computers and Geotechnics, 1996,18(2), 109-126.
    73、温世清,刘汉龙,高玉峰等,现浇现浇混泥土管桩复合地基沉降简化计算研究[J].岩土力学,待刊出.
    74、张晓健,温世清,宋雄伟,PCC单桩复合地基荷载沉降计算[J].电力堪测设计,2003,4:27~30.
    75、刘汉龙,一种新的桩基技术—PCC桩技术.第九届全国土力学及岩土工程学术会议论文集,清华大学,2003.
    76、刘汉龙,现浇混凝土薄壁管桩技术及应用.岩土工程界,2002.
    77、费康,刘汉龙,高玉峰,现浇混凝土薄壁管桩承载性能分析.第九届全国土力学及岩土工程学术会议论文集,2003.
    78、费康,刘汉龙,周云东等,现浇混凝土薄壁管桩单桩性状的简化分析.河海大学学报,2004,32(1):59~62.
    79、费康,刘汉龙,高玉峰等,现浇混凝土薄壁管桩的荷载传递机理.岩土力学.待刊.
    80、费康,刘汉龙,高玉峰,路堤荷载下现浇混凝土薄壁管桩复合地基工作特性分析.岩土力学,待刊.
    81、刘芝平,丰土根,张亚东,现浇混凝土薄壁管桩技术在市政工程中的应用研究.河海大学学报,2003,31(3):324~327.
    82、姜陈钊,刘汉龙,温学钧等,现浇钢渣混凝土薄壁管桩强度特性试验研究.岩土力学,待刊.
    83、姜陈钊,丰土根,费康,钢渣混凝土薄壁管桩复合地基的开发利用.第一届全国土木工程研究生论坛论文集,河海大学出版社,2003.
    84、何筱进,费康,周云东,大直径现浇混凝土薄壁管的水平受荷有限元数值分析计算研究.第一届全国土木工程研究生论坛论文集,河海大学出版社,2003.

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