长沙某地铁车站深基坑周近地表沉降监测与预测研究
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摘要
通过对长沙地铁五号线三一大道站基坑开挖过程中周近地表土体沉降监测数据的分析,利用Origin绘图与数据软件对沉降监测数据进行绘图与拟合,采用了指数曲线模型、对数曲线模型以及三类生长曲线模型拟合了沉降量与时间的关系曲线。结果表明:采用生长曲线模型中Logistic模型拟合效果最优,并利用该模型后续曲线的发展情况对地表的沉降进行预测,对可能出现的风险提前做出预警,从而达到规避风险的目的。
For the foundation pit engineering at Sanyi Ave Station of Changsha Metro Line 5,the surrounding ground subsidence during the excavation was under supervision. The monitoring data was plotted and fitted with Origin graphics and data software,and then the settlement-time curve was obtained by use of exponential curve model,logarithmic curve model and three types of growth curve model. The result shows that,the logistic model in growth curve model may offer optimal fitting effect,and it could predict the ground surface subsidence in virtue of the extrapolated curve,and make alarm in advance on any possible risk for the purpose of risk control.
For the foundation pit engineering at Sanyi Ave Station of Changsha Metro Line 5,the surrounding ground subsidence during the excavation was under supervision. The monitoring data was plotted and fitted with Origin graphics and data software,and then the settlement-time curve was obtained by use of exponential curve model,logarithmic curve model and three types of growth curve model. The result shows that,the logistic model in growth curve model may offer optimal fitting effect,and it could predict the ground surface subsidence in virtue of the extrapolated curve,and make alarm in advance on any possible risk for the purpose of risk control.
引文
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[3]赵会艳,路丽芳,张丽敏,等.土岩组合地铁深基坑施工期变形规律研究[J].公路,2016(2):218-224.ZHAO H Y,LU L F,ZHANG L M,et al.Study of deformation law for deep foundation of subway pit during construction in soil and rock composite strata[J].Highway,2016(2):218-224.
[4]葛照国.长江漫滩地区基坑施工对周边地表沉降及地下管线影响的现场试验研究[J].现代隧道技术,2014,51(5):205-209.GE Z G.Field test on the impacts of foundation pit construction on ground settlement and underground utilities in the Yangtze river floodplain area[J].Modern Tunnelling Technology,2014,51(5):205-209.
[5]王随新,杨有海,周沈华.杭州地铁秋涛路车站深基坑地表沉降监测分析[J].岩土工程学报,2008,30(增刊):430-435.WANG S X,YANG Y H,ZHOU S H.Monitoring analysis of ground settlement of deep foundation pit at Qiutao Road Station of Hangzhou metro[J].Chinese Journal of Geotechnical Engineering,2008,30(S):430-435.
[6]杨群,谢立广.群光大陆广场深基坑工程变形监测的应用[J].路基工程,2011(5):106-108.YANG Q,XIE L G.Deformation monitoring of deep foundation pit engineering in Qunguang mainland square[J].Subgrade Engineering,2011(5):106-108.
[7]于志新,封良泉,陈雷.某市公路箱涵施工试验阶段周边地表变形监测与分析[J].路基工程,2012(1):154-156,160.YU Z X,FENG L Q,CHEN L.Monitoring and analysis on surrounding surface deformation of road box culvert in pilot construction phase[J].Subgrade Engineering,2012(1):154-156,160.
[8]姜伟.某地铁车站深基坑施工期周围土体地表沉降监测与数值分析[J].建筑科学,2011,27(7):90-92,110.JIANG W.Deformation monitoring and numerical analysis of surface subsidence of a deep foundation pit in construction[J].Building Science,2011,27(7):90-92,110.
[9]张尚根,袁正如.软土深基坑开挖地表沉降分析[J].地下空间与工程学报,2013,9(增刊1):1753-1757.ZHANG S G,YUAN Z R.Analysis of ground settlement induced by excavation of deep foundation pit in soft soil[J].Chinese Journal of Underground Space and Engineering,2013,9(S1):1753-1757.
[10]王丰胜.基于理论和实测的路基沉降混合预测方法[J].长安大学学报(自然科学版),2011,31(4):34-38.WANG F S.Mixed prediction method of embankment settlement based on theory and practical survey[J].Journal of Chang'an University(Natural Science),2011,31(4):34-38.