黄土地区基坑支护方案优化设计
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摘要
本文以某地铁明挖车站的基坑工程为研究背景,利用FLAC3D数值模拟软件建立深基坑支护变形沉降的数值计算模型,对比实际工程检测结果发现数值计算结果吻合度高,在此基础上,改变桩径与桩间距、桩长、支撑水平间距、支撑竖向间距等关键支护参数,分析支护参数对围护结构变形与地表沉降的影响规律,提出优化支护方案。研究表明:依托工程理想围护结构桩为直径0.8 m间距1.1 m的钻孔灌注桩,桩长为23 m?25 m,支撑水平间距为4 m,并且应合理布置支撑竖向间距。
Based on the foundation pit project of a subway open-cut station as the research background, a numerical model of settlement deformation of deep foundation pit supporting was established wtih FLAC3 D numerical simulation software.Contrast test results found that the results of numerical calculation of actual engineering degree was high. Therefore, support key parameters such as pile spacing, pile length and pile diameter, support level spacing, the vertical spacing were changed to analyze the influence law of ground surface subsidence, optimization of supporting schemes. Based on the engineering retaining structure pile, the research showed that the best bored pile diameter is 0.8 m and spacing was 1.1 m, the pile length was 23 m-25 m, the horizontal spacing of supports was 4 m, and the vertical spacing of supports was reasonably arranged.
Based on the foundation pit project of a subway open-cut station as the research background, a numerical model of settlement deformation of deep foundation pit supporting was established wtih FLAC3 D numerical simulation software.Contrast test results found that the results of numerical calculation of actual engineering degree was high. Therefore, support key parameters such as pile spacing, pile length and pile diameter, support level spacing, the vertical spacing were changed to analyze the influence law of ground surface subsidence, optimization of supporting schemes. Based on the engineering retaining structure pile, the research showed that the best bored pile diameter is 0.8 m and spacing was 1.1 m, the pile length was 23 m-25 m, the horizontal spacing of supports was 4 m, and the vertical spacing of supports was reasonably arranged.
引文
[1]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(S2):404-411
[2]任望东,李春光,田建平,等.软弱土中大面积深基坑工程快速支护施工技术[J].施工技术,2013,42(1):35-39
[3]刘方梅.深基坑开挖对临近地铁隧道的影响[D].杭州:浙江大学,2015
[4]徐向辉.虹桥综合交通枢纽深大基坑关键技术研究[J].铁道工程学报,2009,26(6):44-49
[5]刘志忠.西安地区深基坑边坡支护及其变形研究[D].西安:西安建筑科技大学,2014
[6]黄雪峰,杨校辉,朱彦鹏,等.西宁地区常用基坑支护结构对比分析[J].岩土工程学报,2012,34(s1):432-439
[7]邓友生,龙新乐,闫卫玲,等.深基坑支护结构体系的分析[J].湖北工业大学学报,2013,28(2):15-18
[8]李瑛,唐登,朱浩源.H型钢构建的绿色深基坑支护体系初探[J].科技通报,2017,33(2):177-180
[2]任望东,李春光,田建平,等.软弱土中大面积深基坑工程快速支护施工技术[J].施工技术,2013,42(1):35-39
[3]刘方梅.深基坑开挖对临近地铁隧道的影响[D].杭州:浙江大学,2015
[4]徐向辉.虹桥综合交通枢纽深大基坑关键技术研究[J].铁道工程学报,2009,26(6):44-49
[5]刘志忠.西安地区深基坑边坡支护及其变形研究[D].西安:西安建筑科技大学,2014
[6]黄雪峰,杨校辉,朱彦鹏,等.西宁地区常用基坑支护结构对比分析[J].岩土工程学报,2012,34(s1):432-439
[7]邓友生,龙新乐,闫卫玲,等.深基坑支护结构体系的分析[J].湖北工业大学学报,2013,28(2):15-18
[8]李瑛,唐登,朱浩源.H型钢构建的绿色深基坑支护体系初探[J].科技通报,2017,33(2):177-180