基于流固耦合效应的红砂岩地层深基坑围护结构变形特性分析
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摘要
降水渗流引起的基坑变形问题十分复杂,采用流固耦合的数值方法,以兰州某地铁车站红砂岩深基坑为研究背景。对围护桩体水平位移、基坑内外土体竖向位移和水位变化进行现场监测,利用FLAC3D建立车站基坑降水开挖耦合模型,分析了围护结构的变形特性以及基坑内外土体竖向变形规律。结果表明围护桩体最大水平位移在0. 5倍左右坑深处;基坑开挖对周围土体在0～2. 5倍坑深范围内的沉降变形影响显著,最大沉降值发生在距离基坑边缘约0. 55倍坑深;降水引起的基坑内外沉降随时间增加呈减小的趋势,降水与立柱桩联合作用使坑底隆起显著减小,基坑内外同时降水有利于解决红砂岩透水问题。考虑流固耦合的数值模拟与现场监测相结合预测兰州地区基坑变形更具科学性。
The deformation of foundation pit caused by dewatering seepage is very complicated. The fluid-solid coupling numerical method is used to study the red sandstone deep foundation pit of a subway station in Lanzhou.The deformation characteristics of the retaining pile at different depths and the variation rules of the ground settlement in the case of employing the numerical software FLAC3 Dto simulated the completed excavation process and monitoring the horizontal displacement of the retaining pile and the settlement of the soil around the foundation pit and are analyzed. According to the results,the maximum horizontal displacement occurs at about 0. 5 times the depth of pit. The excavation of foundation pit has significant influence on the surrounding soil in the range of 0 ～2. 5 times the depth of pit and the maximum settlement occurs at a distance of about 0. 55 times the depth of pit from the edge of the foundation pit. The settlement inside and outside the foundation pit caused by dewatering decreases with time. The combined action of dewatering and soldier piles can reduce the uplift of the bottom of the pit significantly,and the dewatering inside and outside the pit can solve the problem of red sandstone permeability. It is more scientific to predict the deformation of foundation pit in Lanzhou area by combining numerical simulation with field monitoring.
The deformation of foundation pit caused by dewatering seepage is very complicated. The fluid-solid coupling numerical method is used to study the red sandstone deep foundation pit of a subway station in Lanzhou.The deformation characteristics of the retaining pile at different depths and the variation rules of the ground settlement in the case of employing the numerical software FLAC3 Dto simulated the completed excavation process and monitoring the horizontal displacement of the retaining pile and the settlement of the soil around the foundation pit and are analyzed. According to the results,the maximum horizontal displacement occurs at about 0. 5 times the depth of pit. The excavation of foundation pit has significant influence on the surrounding soil in the range of 0 ～2. 5 times the depth of pit and the maximum settlement occurs at a distance of about 0. 55 times the depth of pit from the edge of the foundation pit. The settlement inside and outside the foundation pit caused by dewatering decreases with time. The combined action of dewatering and soldier piles can reduce the uplift of the bottom of the pit significantly,and the dewatering inside and outside the pit can solve the problem of red sandstone permeability. It is more scientific to predict the deformation of foundation pit in Lanzhou area by combining numerical simulation with field monitoring.
引文
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3 龚晓南.对岩土工程数值分析的几点思考[J].岩土力学,2011,32(2):321-325Gong Xiaonan. Reflections on numerical analysis of geotechnical engineering[J]. Chinese Journal of Rock and Soil Mechanics,2011,32(2):321-325
4 吴意谦,朱彦鹏.兰州市湿陷性黄土地区地铁车站深基坑变形规律监测与数值模拟研究[J].岩土工程学报,2014,36(增刊2):405-411Wu Yiqian,Zhu Yanpeng. Monitoring and numerical simulation of deformation law of deep foundation pit of subway station in Lanzhou collapsible loess[J]. Chinese Journal of Geotechnical Engineering,2014,36(S2):405-411
5 孟长江.汉口站出站厅深基坑支护设计与监测分析[J].岩土工程学报,2010,32(增刊1):478-82Meng Changjiang. Design and monitoring of deep foundation pit of Hankou Station[J]. Chinese Journal of Geotechnical Engineering,2010,32(S1):478-82
6 周勇,王晓莉,朱彦鹏,等.兰州地铁湿陷性黄土深基坑在降低水位条件下的渗流稳定性分析[J].中国铁道科学,2017,38(1):86-94Zhou Yong,Wang Xiaoli,Zhu Yanpeng,et al. Seepage stability analysis of deep foundation pit of collapsible loess in Lanzhou Metro under condition of lowering water level[J]. Chinese Railway Science,2017,38(1):86-94
7 王广国,杜明芳,侯学渊.深基坑的大变形分析[J].岩石力学与工程学报,2000,19(4):509-512Wang Guangguo,Du Mingfang,Hou Xueyuan. Large deformation analysis of deep foundation pit[J]. Chinese Journal of Rock Mechanics and Engineering,2000,19(4):509-512
8 周勇,郭楠,朱彦鹏.兰州地铁世纪大道站基坑支护监测与数值模拟[J].铁道工程学报,2014,1(1):82-88Zhou Yong,Guo Nan,Zhu Yanpeng. Construction monitoring and numerical simulation of deep excavation of century avenue metro station in Lanzhou[J]. Journal of Railway Engineering Society,2014,1(1):82-88
9 Hsieh P G,Ou C Y. Shape of ground surface settlement profiles caused by excavation[J]. Canadian Geotechnical Journal,1998,35:1004-1017
10 李佳宇,张子新.圆砾层地铁车站深基坑变形特征三维数值分析[J].地下空间与工程学报,2012,8(1):71-76,110Li Jiayu,Zhang Zixin. 3D numerical analysis of deep station excavation constructed in round gravel strata[J]. Chinese Journal of Underground Space and Engineering,2012,8(1):71-76,110
11 宋广,宋二祥.基坑开挖数值模拟中土体本构模型的选取[J].工程力学,2014,31(5):86-94Song Guang,Song Erxiang. Selection of soil constitutive models for numerical[J]. Engineering Mechanics,2014,31(5):86-94
12 胡安峰,张光建,王金昌,等.地铁换乘车站基坑围护结构变形监测与数值模拟[J].岩土工程学报,2012,34(增刊2):495-499Hu Anfeng,Zhang Guangjian,Wang Jinchang,et al. Monitoring and numerical simulation of deformation of retaining structure excavation of a metro transfer station[J]. Chinese Journal of Geotechnical Engineering,2012,34(S2):495-499
13 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):457-461Liu Jie,Yao Hailin,Ren Jianxi. Monitoring and numerical simulation of deformation of retaining structure in subway station foundation pit[J]. Chinese Journal of Rock and Soil Mechanics,2010,31(S2):457-461
14 姜忻良,宗金辉,孙良涛.天津某深基坑工程施工监测及数值模拟分析[J].土木工程学报,2007,40(2):120-125Jiang Xinliang,Zong Jinhui,Sun Liangtao. Construction monitoring and numerical simulation for a deep excavation in Tianjin[J]. China Civil Engineering Journal,2007,40(2):120-125
15 殷俊鹏,张啸,阮怀宁,等.基坑开挖对T型地下连续墙水平位移的影响[J].科学技术与工程,2017,17(7):232-236Yin Junpeng,Zhang Xiao,Ruan Huaining,et al. Influence of foundation pit excavation on horizontal displacement of T diaphragm wall[J]. Science Technology and Engineering,2017,17(7):232-236
2 刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997Liu Jianhang, Hou Xueyuan. Foundation pit engineering manual[M]. Beijing:China Construction Industry Press,1997
3 龚晓南.对岩土工程数值分析的几点思考[J].岩土力学,2011,32(2):321-325Gong Xiaonan. Reflections on numerical analysis of geotechnical engineering[J]. Chinese Journal of Rock and Soil Mechanics,2011,32(2):321-325
4 吴意谦,朱彦鹏.兰州市湿陷性黄土地区地铁车站深基坑变形规律监测与数值模拟研究[J].岩土工程学报,2014,36(增刊2):405-411Wu Yiqian,Zhu Yanpeng. Monitoring and numerical simulation of deformation law of deep foundation pit of subway station in Lanzhou collapsible loess[J]. Chinese Journal of Geotechnical Engineering,2014,36(S2):405-411
5 孟长江.汉口站出站厅深基坑支护设计与监测分析[J].岩土工程学报,2010,32(增刊1):478-82Meng Changjiang. Design and monitoring of deep foundation pit of Hankou Station[J]. Chinese Journal of Geotechnical Engineering,2010,32(S1):478-82
6 周勇,王晓莉,朱彦鹏,等.兰州地铁湿陷性黄土深基坑在降低水位条件下的渗流稳定性分析[J].中国铁道科学,2017,38(1):86-94Zhou Yong,Wang Xiaoli,Zhu Yanpeng,et al. Seepage stability analysis of deep foundation pit of collapsible loess in Lanzhou Metro under condition of lowering water level[J]. Chinese Railway Science,2017,38(1):86-94
7 王广国,杜明芳,侯学渊.深基坑的大变形分析[J].岩石力学与工程学报,2000,19(4):509-512Wang Guangguo,Du Mingfang,Hou Xueyuan. Large deformation analysis of deep foundation pit[J]. Chinese Journal of Rock Mechanics and Engineering,2000,19(4):509-512
8 周勇,郭楠,朱彦鹏.兰州地铁世纪大道站基坑支护监测与数值模拟[J].铁道工程学报,2014,1(1):82-88Zhou Yong,Guo Nan,Zhu Yanpeng. Construction monitoring and numerical simulation of deep excavation of century avenue metro station in Lanzhou[J]. Journal of Railway Engineering Society,2014,1(1):82-88
9 Hsieh P G,Ou C Y. Shape of ground surface settlement profiles caused by excavation[J]. Canadian Geotechnical Journal,1998,35:1004-1017
10 李佳宇,张子新.圆砾层地铁车站深基坑变形特征三维数值分析[J].地下空间与工程学报,2012,8(1):71-76,110Li Jiayu,Zhang Zixin. 3D numerical analysis of deep station excavation constructed in round gravel strata[J]. Chinese Journal of Underground Space and Engineering,2012,8(1):71-76,110
11 宋广,宋二祥.基坑开挖数值模拟中土体本构模型的选取[J].工程力学,2014,31(5):86-94Song Guang,Song Erxiang. Selection of soil constitutive models for numerical[J]. Engineering Mechanics,2014,31(5):86-94
12 胡安峰,张光建,王金昌,等.地铁换乘车站基坑围护结构变形监测与数值模拟[J].岩土工程学报,2012,34(增刊2):495-499Hu Anfeng,Zhang Guangjian,Wang Jinchang,et al. Monitoring and numerical simulation of deformation of retaining structure excavation of a metro transfer station[J]. Chinese Journal of Geotechnical Engineering,2012,34(S2):495-499
13 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):457-461Liu Jie,Yao Hailin,Ren Jianxi. Monitoring and numerical simulation of deformation of retaining structure in subway station foundation pit[J]. Chinese Journal of Rock and Soil Mechanics,2010,31(S2):457-461
14 姜忻良,宗金辉,孙良涛.天津某深基坑工程施工监测及数值模拟分析[J].土木工程学报,2007,40(2):120-125Jiang Xinliang,Zong Jinhui,Sun Liangtao. Construction monitoring and numerical simulation for a deep excavation in Tianjin[J]. China Civil Engineering Journal,2007,40(2):120-125
15 殷俊鹏,张啸,阮怀宁,等.基坑开挖对T型地下连续墙水平位移的影响[J].科学技术与工程,2017,17(7):232-236Yin Junpeng,Zhang Xiao,Ruan Huaining,et al. Influence of foundation pit excavation on horizontal displacement of T diaphragm wall[J]. Science Technology and Engineering,2017,17(7):232-236
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