深基坑开挖对临近运营铁路的变形影响
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摘要
以南昌地铁3号线上沙沟车站临近既有铁路线的基坑工程为依托,采用有限元软件对基坑开挖的全过程进行模拟,分析了基坑开挖对临近运营铁路的变形影响及铁路加固方案的可靠性。结果表明:在基坑开挖过程中,最大轨道轨距偏差、轨道水平差异沉降接近报警值,影响列车正常运行。设置钻孔灌注桩与旋喷止水桩后,能有效减小基坑开挖对铁路的变形影响,加固效果显著。基坑的空间效应在坑角处十分明显,隔离结构的设置使空间效应更加复杂,易引起位移突变,应在今后的实际工程中引起重视。
Based on the excavation engineering of Shangshagou Station near the existing railway line on Nanchang Metro Line 3,the whole process of foundation pit excavation was simulated by the finite element software. Meanwhile,the influence of foundation pit excavation on deformation of adjacent railway in operation and the reliability of railway reinforcement schemes were both analyzed. The results show that: during the excavation of foundation pit,the maximum track gauge deviation and horizontal differential settlement of track approach the alarm value,which affects the normal operation of train. After setting drilling piles and sealing up piles with jet grouting,the effect of foundation pit excavation on railway deformation can be effectively reduced,and the reinforcement effect is remarkable. The space effect of the deep excavation is obvious at the pit angle. The setting of the isolation structure makes the spatial effect more complex and causes the displacement mutation easily,which should be paid attention to in future practical projects.
Based on the excavation engineering of Shangshagou Station near the existing railway line on Nanchang Metro Line 3,the whole process of foundation pit excavation was simulated by the finite element software. Meanwhile,the influence of foundation pit excavation on deformation of adjacent railway in operation and the reliability of railway reinforcement schemes were both analyzed. The results show that: during the excavation of foundation pit,the maximum track gauge deviation and horizontal differential settlement of track approach the alarm value,which affects the normal operation of train. After setting drilling piles and sealing up piles with jet grouting,the effect of foundation pit excavation on railway deformation can be effectively reduced,and the reinforcement effect is remarkable. The space effect of the deep excavation is obvious at the pit angle. The setting of the isolation structure makes the spatial effect more complex and causes the displacement mutation easily,which should be paid attention to in future practical projects.
引文
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[2]张荣.地铁深基坑施工对邻近高压铁塔的影响[J].重庆交通大学学报(自然科学版),2011,30(增刊2):1256-1260.ZHANG Rong. Effect of deep foundation excavation in underground railway construction on adjacent high voltage tower[J]. Journal of Chongqing Jiaotong University(Nature Science),2011,30(Sup2):1256-1260.
[3]胡文亮,陈寅春.深基坑施工对邻近连拱隧道影响特性分析[J].重庆交通大学学报(自然科学版),2013,32(5):934-937.HU Wenliang,CHEN Yinchun. Analysis of influence characteristics of multi-arch tunnel underadjacent deep foundation pit construction[J]. Journal of Chongqing Jiaotong University(Nature Science),2013,32(5):934-937.
[4]唐建新,李欣怡.基于模糊数学的地铁深基坑稳定性评价[J].安全与环境学报,2018,18(6):2135-2140.
[4] TANG Jianxin,LI Xinyi. On the stability evaluation of the deep subway foundation pit based on the fuzzy mathematical theory[J]. Journal of Safety and Environment,2018,18(6):2135-2140.
[5]石钰锋,阳军生,白伟,等.紧邻铁路偏压基坑围护结构变形与内力测试分析[J].岩石力学与工程学报,2011,30(4):826-833.SHI Yufeng,YANG Junsheng,BAI Wei,et al. Analysis of field testing for deformation and internal force of unsymmetrical loaded foundation pit’s enclosure structure close to railway[J]. Chinese Journal of Rock Mechanics and Engineering,2011,30(4):826-833.
[6]张新东.邻近铁路深基坑支护结构及路基安全性控制研究[D].北京:北京工业大学,2012.ZHANG Xindong. Study on the Retaining Structure of Deep Foundation Pit and Safety Control of Subgrade Close to Railway[D]. Beijing:Beijing University of Technology,2012.
[7]李明广,陈锦剑,徐安军,等.深基坑开挖与紧邻运营铁路的相互影响分析[J].地下空间与工程学报,2015,11(2):435-439.LI Mingguang, CHEN Jinjian, XU Anjun, et al. Interactive behavior between the deep excavation and close operating railway[J].Chinese Journal of Underground Space and Engineering,2015,11(2):435-439.
[8]王培鑫,周顺华,狄宏规,等.基坑开挖对邻近铁路路基变形影响与控制[J].岩土力学,2016,37(增刊1):469-476.WANG Peixin,ZHOU Shunhua,DI Honggui,et al. Impacts of foundation pit excavation on adjacent railway subgrade and control[J].Rock and Soil Mechanics,2016,37(Sup1):469-476.
[9]石钰锋.紧邻铁路地铁车站基坑围护结构稳定性研究[D].长沙:中南大学,2010.SHI Yufeng.Study on Stability of Foundation Pit Retaining Structure of Subway Station that Close to Railway[D]. Changsha:Central South University,2010.
[10]徐中华.上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D].上海:上海交通大学,2007.XU Zhonghua. Deformation Behavior of Deep Excavations Supported by Permanent Structure in Shanghai Soft Deposit[D]. Shanghai:Shanghai Jiao Tong University,2007.
[11]朱庆科.深基坑双排桩支护结构体系若干问题分析与研究[D].广州:华南理工大学,2013.ZHU Qingke.Analysis and Research on Several Issues of Double-Row Piles Supporting Structure in Deep Foundation Pit[D]. Guangzhou:South China University of Technology,2013.