复杂堤防加固设计的有限元数值分析
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摘要
基于复杂的工程实际,建立"堤防-桩-地基"的三维数学模型,先通过变位观测值反演出杂体土及其灌浆后的力学参数;再根据反演成果,计算现状堤防在达标洪水作用下的变位达5. 8 cm,位移太大,表明对现状堤防加固是必要的,同时也得到内排桩内侧地基土的变形是桩基水平变位的重要原因;然后提出在堤后增设地下连续墙的加固方案,计算表明该方案可较好地控制堤防位移,虽改变原有桩基的受力特点,但结构强度仍满足规范要求。研究表明:经观测率定的数值分析方法和成果为复杂地基堤防加固的研究和设计提供了有效、可靠的参考和依据。
Based on the complicated engineering practice, a three-dimensional mathematical model of "dike-pile-foundation" was established. The parameters of the mixed soil and its grouting were first inspected through the displacement observations. Then based on the inversion parameters, the displacement of current dikes against floods was calculated to be 5. 8cm, and the displacement was too large, indicating that it is necessary to reinforce the existing dike; It also shows that the deformation of the inner soil of the inner row pile is an important reason for the horizontal displacement of the pile foundation. Then, the reinforcement scheme of adding underground continuous wall behind the embankment is proposed. The calculation shows that the scheme can better control the embankment displacement. Although the force characteristics of the original pile foundation are changed, the structural strength still meets the specification requirements. The research shows that the numerical analysis method and the results obtained by the observation rate provide an effective and reliable reference and basis for the research and design of the embankment reinforcement on the complex foundation.
Based on the complicated engineering practice, a three-dimensional mathematical model of "dike-pile-foundation" was established. The parameters of the mixed soil and its grouting were first inspected through the displacement observations. Then based on the inversion parameters, the displacement of current dikes against floods was calculated to be 5. 8cm, and the displacement was too large, indicating that it is necessary to reinforce the existing dike; It also shows that the deformation of the inner soil of the inner row pile is an important reason for the horizontal displacement of the pile foundation. Then, the reinforcement scheme of adding underground continuous wall behind the embankment is proposed. The calculation shows that the scheme can better control the embankment displacement. Although the force characteristics of the original pile foundation are changed, the structural strength still meets the specification requirements. The research shows that the numerical analysis method and the results obtained by the observation rate provide an effective and reliable reference and basis for the research and design of the embankment reinforcement on the complex foundation.
引文
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[2]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.
[3]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.
[4]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.
[5]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.
[6]ZHU G F,YIN J H,GRAHAM J.Consolidation modeling of soils under the test embankment at Chek Lap Kok International Airport in Hong Kong using a simplified finite element method[J].Canadian Geotechnical Journal,2001,38(2):349-362.
[7]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.
[8]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.
[9]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.
[10]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.
[11]Altair Engineering,Inc,HyperMesh 6.0 Advanced Tutorials[Z].2003.
[12]中华人民共和国住房和城乡建设部.建筑桩基技术规范JGJ94-2008[S].北京:中国建筑工业出版社,2008.