摘要(Abstract)：
针对桩-钢支撑支护形式的基坑工程,应用基于离散元理论的颗粒流软件PFC2D建立桩-钢支撑支护基坑颗粒流数值模型,对比分析有钢支撑和无钢支撑支护基坑开挖过程桩体水平位移、坑底隆起和接触力变化规律。结果表明:在有钢支撑支护的情况下,基坑开挖过程中桩体水平位移远小于无钢支撑支护的桩体水平位移;在基坑开挖过程中,第2、 3道钢支撑起到了主要作用。
关键词(KeyWords)： 桩-钢支撑;基坑工程;颗粒流模型;数值模拟
基金项目(Foundation): 国家自然科学基金项目(41201007,51474048);; 中央高校基本科研业务费专项资金项目(N130401003);; 辽宁省教育厅科学研究一般项目(L2013103);; 沈阳建筑大学科研创新培育计划项目(CXPY2017016)
作者(Author): 吴凤元,樊赟赟,梁力,孙彤
DOI: 10.13349/j.cnki.jdxbn.2020.01.002
参考文献(References)：
[1] OU C Y,CHIOU D C,WU T S.Three-dimensional finite element analysis of deep excavations[J].Journal of Geotechnical Engineering,1996,122(5):337-345.
[2] YOO C.Behavior of braced and anchored walls in soils overlying rock[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(3):225-233.
[3] CORINALDESI V,MORICONI G.Behavior of beam-column joints made of sustainable concrete under cyclic loading[J].Journal of Materials in Civil Engineering,2006,18(5):650-658.
[4] FINNO R J,BLACKBURN J T,ROBOSKI J F.Three-dimensional effects for supported excavations in clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(1):30-36.
[5] 李永靖,王春华,孙琦,等.地铁深基坑开挖对周围地表沉降的影响[J].辽宁工程技术大学学报(自然科学版),2017,36(4):387-390.
[6] 刘杰,姚海林,任建喜.地铁车站基坑围护结构变形监测与数值模拟[J].岩土力学,2010,31(增刊2):456-461.
[7] 房师军,付拥军,姚爱军.某地铁工程深基坑排桩围护结构变形规律分析[J].岩土工程学报,2011,33(增刊1):216-219.
[8] 张光建,姚小波,胡瑾.地铁换乘车站基坑支撑轴力监测与数值模拟[J].岩土工程学报,2014,36(增刊2):455-459.
[9] Itasca Consulting Group Inc.PFC2D:particle flow code in 2 dimensions:optional features[M].Minneapolis:ICG,2005.
[10] TEUFELSBAUER H,WANG Y,PUDASAINI S P,et al.DEM simulation of impact force exerted by granular flow on rigid structures[J].Acta Geotechnica,2011,6(3):119-133.
[11] ASADI M S,RASOULI V,BARLA G.A bonded particle model simulation of shear strength and asperity degradation for rough rock fractures[J].Rock Mechanics and Rock Engineering,2012,45(5):649-675.
[12] 周健,李飞,张姣,等.复合土钉墙支护基坑颗粒流数值模拟研究[J].同济大学学报(自然科学版),2011,39(7):966-971.
