关中黄土地区挖孔灌注桩竖向承载力特性研究
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摘要
关中黄土由于特殊的历史成因,具有特殊的工程性质。桩基作为一种有效基础形式,对其在该地区的应用及工程性状研究无疑有着重要意义。挖孔灌注桩竖向承载力与沉降一直是需要研究的问题。基于合理的理论依据,提出合适的单桩承载力与沉降的计算方法显得尤为重要。因此,本文结合永寿至咸阳高速公路咸阳机场立交静载试验,对关中黄土地区挖孔灌注桩承载力特性进行了认真的研究。在试验分析的基础上,进一步推导出桩顶荷载—沉降关系的解析解,利用ANSYS有限元分析软件进行数值模拟,取得了以下主要成果：
1.研究了JCS1、JCS2、JCS3三根试桩浸水前后竖向受压的荷载传递性状,包括桩身轴力分布特征、桩侧摩阻力与桩端阻力的发挥性状以及极限承载力的确定,并进行了浸水前后对比分析。
2.在前人研究成果的基础上,进行合理简化,推导出均质土中挖孔灌注桩单桩的荷载—沉降关系的解析解,对修正了的佐滕悟荷载传递函数中的各参数及桩端沉降计算所采用的文克尔地基模型中的参数进行了一定的探讨,并加以确定。采用本文推导出的解析解计算得到单桩的荷载—沉降关系曲线,与试验值进行了初步对比分析。
3.利用ANSYS有限元分析软件建立模型,进一步探讨单桩的荷载传递规律,得到桩顶荷载—沉降的关系曲线,与静载试验值、理论计算值进行了对比分析,从而验证了本文推导出的解析解的可行性。
Due to the special historical origin, loess of Guanzhong has the special project nature. As one kind of effective underlying form, the pile foundationundoubtedly has the important meaning of application and project character research in this area. The vertical bearing capacity and subsidence of dig-pouring pile has been the focus of the study. Based on the reasonable theory basis, making appropriate calculation method of bearing capacity and subsidence of sing pile is especially important. Therefore, this paper combines static load test of Yongshou to Xianyang Airport Expressway overpass, has conducted a serious-minded research to the relevant characteristics of dig-pouring pile bearing capacity which is located in loess area of Guanzhong. Based on the analysis in the test, further the modified analytic solution of pile load-subsidence relations is deduced, ANSYS finite element analysis software is used to make numerical simulation, and the conclusion are listed as follows:
1. The vertical bearing load transmission character of three test pile which is JCS1、JCS2、and JCS3 around immersion is studied. Including the distributed characteristic of pile shaft axle strength, the display character of pile side friction, and tip of pile resistance, as well as the limit bearing capacity's determination, further strength character around immersion is analyzed and contrasted.
2. On the basis of research findings by predecessors, by rational simplification, load-settlement relation's analytical solution of single pile which is dig-pouring pile in homogeneous soil is entailed, the parameters in revised load transfer function of Wu Satoh and the parameter in winkler foundation model that is used to calculated pile end settlement are discussed and determined. The entailed analytical solution in this paper is used to calculated and obtained load settlement graph, which is comparing with experiment value.
3. ANSYS finite element analysis software is used to build model, and further explores the load transfer rule of single pile, then load settlement graph which is on the top of pile is obtained, then it is used to contrast with the value of static load test and the theoretical value, so the feasibility of the entailed analytical solution in this paper is verified.
1.研究了JCS1、JCS2、JCS3三根试桩浸水前后竖向受压的荷载传递性状,包括桩身轴力分布特征、桩侧摩阻力与桩端阻力的发挥性状以及极限承载力的确定,并进行了浸水前后对比分析。
2.在前人研究成果的基础上,进行合理简化,推导出均质土中挖孔灌注桩单桩的荷载—沉降关系的解析解,对修正了的佐滕悟荷载传递函数中的各参数及桩端沉降计算所采用的文克尔地基模型中的参数进行了一定的探讨,并加以确定。采用本文推导出的解析解计算得到单桩的荷载—沉降关系曲线,与试验值进行了初步对比分析。
3.利用ANSYS有限元分析软件建立模型,进一步探讨单桩的荷载传递规律,得到桩顶荷载—沉降的关系曲线,与静载试验值、理论计算值进行了对比分析,从而验证了本文推导出的解析解的可行性。
Due to the special historical origin, loess of Guanzhong has the special project nature. As one kind of effective underlying form, the pile foundationundoubtedly has the important meaning of application and project character research in this area. The vertical bearing capacity and subsidence of dig-pouring pile has been the focus of the study. Based on the reasonable theory basis, making appropriate calculation method of bearing capacity and subsidence of sing pile is especially important. Therefore, this paper combines static load test of Yongshou to Xianyang Airport Expressway overpass, has conducted a serious-minded research to the relevant characteristics of dig-pouring pile bearing capacity which is located in loess area of Guanzhong. Based on the analysis in the test, further the modified analytic solution of pile load-subsidence relations is deduced, ANSYS finite element analysis software is used to make numerical simulation, and the conclusion are listed as follows:
1. The vertical bearing load transmission character of three test pile which is JCS1、JCS2、and JCS3 around immersion is studied. Including the distributed characteristic of pile shaft axle strength, the display character of pile side friction, and tip of pile resistance, as well as the limit bearing capacity's determination, further strength character around immersion is analyzed and contrasted.
2. On the basis of research findings by predecessors, by rational simplification, load-settlement relation's analytical solution of single pile which is dig-pouring pile in homogeneous soil is entailed, the parameters in revised load transfer function of Wu Satoh and the parameter in winkler foundation model that is used to calculated pile end settlement are discussed and determined. The entailed analytical solution in this paper is used to calculated and obtained load settlement graph, which is comparing with experiment value.
3. ANSYS finite element analysis software is used to build model, and further explores the load transfer rule of single pile, then load settlement graph which is on the top of pile is obtained, then it is used to contrast with the value of static load test and the theoretical value, so the feasibility of the entailed analytical solution in this paper is verified.
引文
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[2]史佩栋.深基础工程特殊技术问题[M].北京：人民交通出版社,2004.06
[3]史佩栋.桩基工程手册[M].北京：人民交通出版社,2008.07
[4]林新元 湿陷性黄土地区桥梁桩基承载力性状试验研究[D].西安：长安大学,2004
[5]张展弢 黄土地区单桩竖向承载力与沉降特性的研究[D].西安：西安理工大学,2003
[6]刘祖典 黄土工程力学[M].西安：陕西科学技术出版社,1997
[7]朱鸿昌 黄土地基载体桩承载机理试验与应用研究[D].西安：西安建筑科技大学,2008
[8]章杰 黄土地基中钻孔灌注桩单桩承载性状的现场试验研究[D].西安：西安建筑科技大学,2003
[9]陈张峰 黄土地区摩擦型桩静载试验中锚桩对试桩承载力影响研究[D].西安：西安建筑科技大学,2005
[10]毛军南 黄土湿陷性评价与挤密桩法地基处理应用[D].南京：河海大学,2005
[11]冯忠居.特殊地区基础工程[M].北京：人民交通出版社,2008.07
[12]谢永建.黄土地基中“纯摩擦单桩”轴向荷载—沉降曲线的解析算法[D].西安：西安建筑科技大学,2002
[13]谢定义.黄土力学特征与应用研究的过去、现在、和未来[J].地下空间,1999,19(4)：273-284
[14]JTG D63—2007,公路桥涵地基与基础设计规范[S].北京：人民交通出版社,2007
[15]GB 50007—2002,建筑地基基础设计规范[S].北京：中国建筑工业出版社,2002
[16]JGJ 94—2008,建筑桩基技术规范[S].北京：中国建筑工业出版社,2008
[17]刘金砺.桩基础设计与计算[M].北京：中国建筑工业出版社,1990
[18]张雁,刘金波.桩基手册[M].北京：中国建筑工业出版社,2009
[19]编写委员会.桩基工程手册[M].北京：中国建筑工业出版社,1995
[20]佐腾悟.基桩承载力机理[J].土工技术,1965,20(1)：1-5
[21]曹汉志.桩的轴向荷载传递及荷载—沉降曲线的数值计算方法[J].岩土工程学报,1986,(06)
[22]罗惟德.单桩承载机理分析与荷载—沉降曲线的理论推导[J].岩土工程学报,1990,Vol.12
[23]陈龙珠,梁国钱,朱金颖,等.桩轴向荷载—沉降曲线的一种解析算法[J].岩土工程学报,1994,Vol.16
[24]陈明中,龚晓南,严平.单桩沉降的一种解析解法[J].水利学报,2000,(08)
[25]邱钰,胡雪辉,刘松玉.用荷载传递法计算深长大直径嵌岩桩单桩沉降[J].土木工程学报,2001, Vol.34
[26]杨军龙,陈然,孙邦臣.复合桩基沉降的一种解析解[J].岩土工程技术,2001,(04)
[27]杨从军,单华刚.摩擦桩沉降变形规律及承载力确定的探讨[J].岩土力学,2002,Vol.21
[28]洪鑫,曹国辉,施建勇.双线性荷载传递函数的单桩荷载沉降关系统一解岩土工程学报[J].岩土工程学报,2004,26(3)
[29]房卫民,赵明华,苏检来.由沉降量控制桩竖向极限承载力的分析[J].中南公路工程,1999,24(2)
[30]刘齐建.大直径桥梁基桩竖向承载力分析及试验研究[D].长沙：湖南大学,2003
[31]何俊翘.基桩竖向变形与承载力机理研究[D].长沙：湖南大学,2002
[32]刘杰,张可能,肖宏彬.考虑桩侧土软化时单桩荷载—沉降关系的解析算法[J].中国公路学报,2003,16(2)
[33]赵明华,何俊翘,曹文贵,等.基桩竖向荷载传递模型及承载力研究[J].湖南大学学报,2005,32(1)
[34]辛公峰.大直径超长桩侧阻软化试验与理论研究[D].杭州：浙江大学,2006
[35]Kezdi, A. The bearing capacity of pile and pile groups[J], Proc,4th ICSMFE, London,1957, Vol.2
[36]Gardner, W.S. Consideration in the design of drilled piles[M], Design, Construction and performance of Deep Foundation,1975
[37]Vijayvergiga, V.N., Load-movement characteristics of piles[J], Proc.4th Symposium of waterway, Port, Coastal and Ocean Division, ASCE, Long Beach, Calif,1977, Vol.2
[38]Kraft, L.M., Ray, R.P., and Kagawa, T. Theoritical t-z curves[J], J.Geotech. Engineering,1981, Vol.102
[39]潘时声.用分层积分法分析桩的荷载传递[J].建筑结构学报,1991,12(5)：68-79
[40]何思明.轴向荷载下单桩荷载传递机理[A].全国桩基工程设计与施工论文集[C].1994
[41]田美存,陆铭.单桩荷载传递规律的研究[J].河海大学学报,1997,Vol.25(2)
[42]邢心魁,张炜.桩的荷载传递函数及其在西安地区旋挖钻孔灌注桩中的应用[J].岩土工程技术,2001,(01)
[43]肖昭然.单桩分析的双曲线模型及相应参数的确定[J].土工基础,2002,(03)
[44]肖宏彬,钟辉虹,张亦静,等.单桩荷载—沉降关系的数值模拟方法[J].岩土力学,2002,23(5)
[45]王秀哲.超长钻孔灌注单桩轴向荷载—沉降曲线研究[D].南京：东南大学,2005
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