高低双排桩挡土性状的非线性有限元分析
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摘要
本文主要采用ABAQUS有限元分析软件了高低双排桩支护结构。通过建立考虑桩土相互作用的平面有限元模型,土体采用修正剑桥模型,计算高低双排桩桩身的侧向变形、弯矩以及作用在桩身的土压力,分析了基坑开挖深度、宽度、双排桩排距、桩身刚度、土体性质等因素对双排桩挡土性状的影响,总结了双排桩支护结构的受力特点,得出了对工程实践和理论研究有一定参考价值的结论。
1.随着开挖深度的增加,桩背土压力值逐渐减小。基坑开挖面以上桩身所受主动土压力与理论主动土压力值接近,开挖面以下桩身所受土压力介于理论主动土压力与静止土压力之间,并随着深度的增加,逐渐趋近于静止土压力。
2.随着开挖深度的增加,桩背土压力值逐渐增加,但与理论被动土压力值相差较大。开挖过程结束时,前排桩在基坑开挖面以下桩身中间部分所受的土压力值最大,开挖面与桩底处较小,呈圆弧状分布。后排桩被动土压力接近静止土压力。
因此进行基坑支护结构设计时,主动土压力应予以提高,而被动土压力则应降低。
采用本文所述的方法分析了两个双排桩支护的工程实例,验证了计算模型的合理性和适用性。
A plane finite element model of high-low double-rowed retaining piles considering the pile-soil interaction is proposed in this paper. In this model, the finite element software ABAQUS is used, and soil nonlinearity is modeled using Modified Cam-clay constitutive relationship. The lateral deformation, the moment and the earth pressure of the pile at any point can be calculated with this model. Some factors which have influences on the retaining character of double-row piles are analyzed, such as the excavation depth, width, the array pitch of the double-row piles, the pile stiffness. Through the comparison of the analysis result, some stress characters of the double-row piles are concluded, and some reference results are summarized for engineering practice and theory study.
The main conclusions are the following:
1.As the excavation depth is increasing, the positive earth pressure gets smaller and smaller. The positive earth pressure on the pile above the excavation face is almost equal to the academic positive earth pressure. And when under the excavation face, the earth pressure on the pile is between the academic positive earth pressure and the static earth pressure.
2.As the excavation depth is increasing, the negative earth pressure gets larger and larger, but it has a big different comparing with the academic negative earth pressure. The negative earth pressure is bigger on the middle of the front pile than on the head and the bottom of the front pile. The negative earth pressure on the back pile is almost equal to the academic static pressure.
Through the conclusions above, when design the double-row pile retaining structure, we should enhance the positive earth pressure and reduce the negative earth pressure.
Using the method described in this paper, some project cases are analyzed. The rationality and applicability of the model are validated.
1.随着开挖深度的增加,桩背土压力值逐渐减小。基坑开挖面以上桩身所受主动土压力与理论主动土压力值接近,开挖面以下桩身所受土压力介于理论主动土压力与静止土压力之间,并随着深度的增加,逐渐趋近于静止土压力。
2.随着开挖深度的增加,桩背土压力值逐渐增加,但与理论被动土压力值相差较大。开挖过程结束时,前排桩在基坑开挖面以下桩身中间部分所受的土压力值最大,开挖面与桩底处较小,呈圆弧状分布。后排桩被动土压力接近静止土压力。
因此进行基坑支护结构设计时,主动土压力应予以提高,而被动土压力则应降低。
采用本文所述的方法分析了两个双排桩支护的工程实例,验证了计算模型的合理性和适用性。
A plane finite element model of high-low double-rowed retaining piles considering the pile-soil interaction is proposed in this paper. In this model, the finite element software ABAQUS is used, and soil nonlinearity is modeled using Modified Cam-clay constitutive relationship. The lateral deformation, the moment and the earth pressure of the pile at any point can be calculated with this model. Some factors which have influences on the retaining character of double-row piles are analyzed, such as the excavation depth, width, the array pitch of the double-row piles, the pile stiffness. Through the comparison of the analysis result, some stress characters of the double-row piles are concluded, and some reference results are summarized for engineering practice and theory study.
The main conclusions are the following:
1.As the excavation depth is increasing, the positive earth pressure gets smaller and smaller. The positive earth pressure on the pile above the excavation face is almost equal to the academic positive earth pressure. And when under the excavation face, the earth pressure on the pile is between the academic positive earth pressure and the static earth pressure.
2.As the excavation depth is increasing, the negative earth pressure gets larger and larger, but it has a big different comparing with the academic negative earth pressure. The negative earth pressure is bigger on the middle of the front pile than on the head and the bottom of the front pile. The negative earth pressure on the back pile is almost equal to the academic static pressure.
Through the conclusions above, when design the double-row pile retaining structure, we should enhance the positive earth pressure and reduce the negative earth pressure.
Using the method described in this paper, some project cases are analyzed. The rationality and applicability of the model are validated.
引文
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[11] R.K ROWE,K.M. LEE. An evaluation of simplified techniques for estimating three dimens- ional undrained ground movements due to tunneling in soft soils[J], Canada Geotech,1992, J.29:39~52
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[18]俞建霖,龚晓南.深基坑工程的空间性状分析[J],岩土工程学报,1999,21(1):21~25
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[20]刘建航,侯学渊.基坑工程手册[M],北京:中国建筑工业出版社,1997.4
[21]唐业清.土力学基础工程[M],北京:中国铁道出版社,1989
[22]余志成.深基坑设计与施工[M],北京:中国建筑工业出版,1977
[23]谢康和,周健.岩土工程有限元分析理论与应用[M],北京:科学出版社,2002
[24]钱家欢,殷宗泽.土工原理与计算(第二版)[M],北京:中国水利水电出版社,1996
[25]蔡袁强,赵永倩,吴世明等.软土地基深基坑中双排桩式支护结构有限元分析[J],浙江大学学报,1997,31(4):442~447
[26]万智,王贻荪,李刚.双排桩支护结构的分析与计算[J],湖南大学学报(自然科学版),2001,28(3):116~121
[27]龙驭球,包世华主编.结构力学[M],北京:高等教育出版社,1994.5
[28]张富军.双排桩支护结构研究[D],成都:西南交通大学,2004
[29]平扬,白世伟.深基坑双排桩空间协同计算理论及位移反分析[J],土木工程学报,2001 (4):79~82
[30]封盛,辛业洪.深基坑双排桩支护结构优化设计[J],基建优化,2002,22(6):32~34
[31]刘钊.双排支护桩结构的分析及试验研究[J],岩土工程学报,1993,14(5):76~80
[32]王湛,刘冰花.双排桩计算方法探讨[J],东北地震研究,2001,17(2):64~68
[33]程知言,裘慰伦.双排桩支护结构设计计算方法探讨[J],地质与勘探,2001(2):88~90
[34]熊巨华.一类双排桩支护结构的简化计算方法[J],勘察科学技术,1999(2):32~34
[35]张弘.深基坑开挖中双排桩支护结构的应用于探讨[J],地基处理,1993,4(3):42~47
[36]何颐华,杨斌,金宝森等.双排护坡桩试验与计算的研究[J],建筑结构学报,1996, 17(2):58~66
[37]黄强.护坡桩空间受力简化计算[J],建筑结构,1995(3):28~36
[38]王元湘.深基坑挡土结构的受力分析[J],土木工程学报,1998,31(2):12~20
[39]杨建斌,潘秋元.深基开挖双排桩支护系统性状分析[J],浙江建筑,1995(1):7~10
[40] Hamdy Faheem, Fei Cai, Keizo Ugai etc. Two-dimensional base stability of excavations in soft soils using FEM[J], Computers and Geotechnics, 2003:141~163
[41]沈珠江,朱百里.计算土力学[M],上海:上海科学技术出版社,1990
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