桩基防洪墙三维流固耦合的数值分析
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摘要
为了提出桩基防洪墙加固方案,并研究加固方案的效果,以某重要防洪墙工程为背景,根据有效应力原理,建立"防洪墙-桩-地基"三维流固耦合数学模型。先就防洪墙位移对地基参数进行敏感性分析,发现水位不同时位移对地基参数的敏感性不同,且地基塑性区扩大的过程,也是位移由变形模量主导过渡到由抗剪强度主导的过程;再根据观测值反演杂填土抗剪强度,并对2005年超标洪水位下防洪墙的变位进行了计算,发现地基存在较大塑性变形,有除险加固的必要;然后根据地基应变区分布提出地基加固方案;通过加固前后防洪墙变位的计算和对比,发现采用充填灌浆加固后防洪墙位移减少38.2%,加固效果明显。研究表明:经率定的数学模型和研究方法可较好地反映防洪墙的变位特性,为设计、加固和方案比选提供参考和依据。
In order to propose a reinforcement scheme for the pile foundation flood wall and study the effect of the reinforcement scheme, a three-dimensional fluid-solid coupling mathematical model of "flood wall-pile-foundation" was established based on the background of some important flood control wall project according to the principle of effective stress. First, the sensitivity analysis of the displacement of the flood wall to the foundation parameters reveals that the sensitivity of the displacement to the foundation parameters was different when the water level was different. In addition, the process of foundation plastic zone expansion was also the transition from displacement dominated by deformation modulus to shear strength. Based on the observations, the shear strength of the miscellaneous backfill was inverted, and the displacement of the flood wall under the flood threshold in 2005 was calculated.And it is found that there is a large plastic deformation of the foundation and there is the need for reinforcement. Then, based on the distribution of the ground strain area, the foundation reinforcement scheme was proposed; through the calculation and comparison of the displacement of the flood wall before and after reinforcement, it is found that the displacement of the flood wall was reduced by 38.2% after reinforcement by the filling grouting, and the reinforcement effect is obvious. The research shows that the mathematical model and research method of rate determination can better reflect the displacement characteristics of the flood control wall, and provide reference and basis for design, reinforcement and alternative comparison.
In order to propose a reinforcement scheme for the pile foundation flood wall and study the effect of the reinforcement scheme, a three-dimensional fluid-solid coupling mathematical model of "flood wall-pile-foundation" was established based on the background of some important flood control wall project according to the principle of effective stress. First, the sensitivity analysis of the displacement of the flood wall to the foundation parameters reveals that the sensitivity of the displacement to the foundation parameters was different when the water level was different. In addition, the process of foundation plastic zone expansion was also the transition from displacement dominated by deformation modulus to shear strength. Based on the observations, the shear strength of the miscellaneous backfill was inverted, and the displacement of the flood wall under the flood threshold in 2005 was calculated.And it is found that there is a large plastic deformation of the foundation and there is the need for reinforcement. Then, based on the distribution of the ground strain area, the foundation reinforcement scheme was proposed; through the calculation and comparison of the displacement of the flood wall before and after reinforcement, it is found that the displacement of the flood wall was reduced by 38.2% after reinforcement by the filling grouting, and the reinforcement effect is obvious. The research shows that the mathematical model and research method of rate determination can better reflect the displacement characteristics of the flood control wall, and provide reference and basis for design, reinforcement and alternative comparison.
引文
[1] 中华人民共和国住房和城乡建设部.桩基技术规范:JGJ 94-2008[S].北京:中国建筑工业出版社,2008.
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[7] 汤卓,谢建斌,李丞文,等.基于非饱和土渗流理论的尾矿库流固耦合分析[J].防灾减灾工程学报,2016,36(6):994-1001.
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[10]盛和太,喻海良,范训益.ANSYS有限元原理与工程应用实例大全[M].北京:清华大学出版社,2006.
[11]徐云飞,张强勇,张功实.深基坑支护中微型桩桩土耦合作用的数值模拟[J].人民长江,2012,43(19):60-63.
[12]李永乐,李艳丽,李朋鲁.黄河下游大堤饱和-非饱和土渗流分析[J].人民黄河,2009,31(11):18-20.
[13]游春华,窦杰.500kV输电线路大跨越工程桩土接触分析[J].人民长江,2008,39(3):84-85.
[14]王海涛.Midas/GTS岩土工程数值分析与设计[M].大连:大连理工大学出版社,2013.
[15]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,1996.
[2] 中华人民共和国交通运输部.港口工程桩基规范:JTS 167-4- 2012 [S].北京:人民交通出版社,2012.
[3] 邓宗伟,伍振志,曹浩,等.基于流固耦合的泥水盾构隧道施工引发地表变形[J].中南大学学报(自然科学版),2013,44(2):785-791.
[4] CURTIS K,JITENDRA S,DAVID H,et al.Finite element analysis of an embankment on a soft estuarine deposit using an elastic-viscoplastic soil model[J].Canadian Geotechnical Journal,2009,46(3):357-368.
[5] 李培超,孔祥言,卢德唐.饱和多孔介质流-固耦合渗流的数学模型[J].水动力学研究与进展(A辑),2003,18(4):419-426.
[6] 李培超.多孔介质流-固耦合渗流的数学模型研究[J].岩石力学与工程学报,2004,23(16):2842.
[7] 汤卓,谢建斌,李丞文,等.基于非饱和土渗流理论的尾矿库流固耦合分析[J].防灾减灾工程学报,2016,36(6):994-1001.
[8] 贾善坡,陈卫忠,于洪丹,等.泥岩大变形隧道盾构施工法的围岩稳定性分析[J].岩石力学与工程学报,2007,26(2):3897-3903.
[9] 朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,2009:296-300.
[10]盛和太,喻海良,范训益.ANSYS有限元原理与工程应用实例大全[M].北京:清华大学出版社,2006.
[11]徐云飞,张强勇,张功实.深基坑支护中微型桩桩土耦合作用的数值模拟[J].人民长江,2012,43(19):60-63.
[12]李永乐,李艳丽,李朋鲁.黄河下游大堤饱和-非饱和土渗流分析[J].人民黄河,2009,31(11):18-20.
[13]游春华,窦杰.500kV输电线路大跨越工程桩土接触分析[J].人民长江,2008,39(3):84-85.
[14]王海涛.Midas/GTS岩土工程数值分析与设计[M].大连:大连理工大学出版社,2013.
[15]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,1996.