| 14 | 0 | 15 |
| 下载次数 | 被引频次 | 阅读次数 |
青岛地层属于土岩组合地层，止水帷幕在该地层中施工较难，如果遇到强风化岩层又不可避免地存在裂隙水，为探究井点数以及井深对地下水的影响，以青岛某临海地铁深基坑为例，采用Visual Modflow软件预测该深基坑模型中三种方案的降水效果。经模拟发现，当井深不变时，14口疏干面积为400 m2的方案与18口疏干面积为350 m2的方案相比，坑内降深减少了4.2 m,坑外降深减少了0.039 m,降水引起的地面沉降减少了0.4 mm。当疏干面积不变时，26 m井深(入岩5 m)相比于24 m井深(入岩3 m)基坑内水位降深增加了4.3 m,坑外最大降深增加了0.04 m,坑外最大地面沉降增加了0.4 mm。该基坑计划降深20 m, 14口疏干面积400 m2井深26 m的方案和18口疏干面积350 m2井深24 m的方案满足施工要求。从节约时间、优化井点数以及材料经济方面考虑，在满足施工条件的基础上，选取14口疏干面积400 m2井深26 m的方案较合适。该数值模拟结果为后续疏干井优化的施工提供了一定的参考价值。
Abstract：The Qingdao formation belongs to soil-rock combination formation, and the construction of water-stop curtain in this formation is difficult. If encountering strongly weathered rock layers, it is inevitable to have some fissure water. To explore the impact of well number and well depth on groundwater, this study takes a deep foundation pit near the sea in Qingdao Metro as an example and uses Visual Modflow software to predict the precipitation effect of the three schemes in the deep foundation pit model. It is found through simulation that when the well depth remains unchanged, compared with the scheme with a drainage area of 350 m2 for 18 wells, the scheme with a drainage area of 400 m2 for 14 wells reduced the depth inside the pit by 4.2 m, the depth outside the pit by 0.039 m, and the ground subsidence caused by precipitation by 0.4 mm. When the drainage area remains unchanged, the water level drawdown inside the 26 m well depth(5 m into the rock) increases by 4.3 m compared with that inside the 24 m well depth(3 m into the rock). The maximum drop outside the pit increases by 0.04 m, and the maximum ground subsidence outside the pit increases by 0.4 mm. According to the planned 20 m's depth reduction of the foundation pit, it can be seen that the scheme for 14 wells with a drainage area of 400 m2 and a depth of 26 m, as well as the scheme for 18 wells with a drainage area of 350 m2 and a depth of 24 m, meet the construction requirements. Considering time saving, the optimization of well number and material economy, on the basis of meeting the construction conditions, it is more appropriate to select the scheme of 14 wells with a drainage area of 400 m2 and a depth of 26 m. The numerical simulation results provide certain reference for the subsequent optimization construction of drainage wells.
[1] 梁发云，贾亚杰，邓航，等.深基坑降水沉降计算土体弹性参数取值方法探讨[J].岩土工程学报，2017,39(S2):29-32.LIANG Fayun,JIA Yajie,DENG Hang,et al.Discussions on elastic parameters of soil for land subsidence caused by decompression of confined aquifer in deep excavation[J].Chinese Journal of Geotechnical Engineering,2017,39(S2):29-32.
[2] 刘林.黄土场地深基坑降水试验与数值模拟研究[D].西安：西安建筑科技大学，2012.LIU Lin.Loess field deep foundation pit dewatering test and numerical simulation[D].Xi’an:Xi’an University of Architecture and Technology,2012.
[3] WU Y X,SHEN S L,YUAN D J.Characteristics of dewatering induced drawdown curve under blocking effect of retaining wall in aquifer[J].Journal of Hydrology,2016,539:554-566.
[4] ZENG G X.Combined recharge:A method to prevent ground settlement induced by redevelopment of recharge wells[J].Journal of Hydrology,2019,568 :1-11.
[5] LU W,ZHAO D,LAN W.The effect of excavation dewatering and supporting structure deformation on soil settlement[J].Electronic Journal of Geotechnical Engineering,2015,20(9):3955-3964.
[6] 张亮.地铁区间降水优化方案研究及其应用[D].北京：北京交通大学，2021.ZHANG Liang.Research and application of dewatering optimization scheme in metro tunnel[D].Beijing:Beijing Jiaotong University,2021.
[7] 李凤明，黄骁，张彬，等.北京地铁8号线永定门外站基坑降水方案优化[J].市政技术，2016,34(6):171-174.LI Fengming,HUANG Xiao,ZHANG Bin,et al.Optimum design of foundation pit dewatering at Yongdingmenwai Station of Beijing Metro Line 8[J].Municipal Engineering Technology,2016,34(6):171-174.
[8] 白兆明.泉域承压水地层深大基坑降水优化方案研究[J].施工技术，2024,53(10):51-56.BAI Zhaoming.Study on optimization scheme of deep and large foundation excavation dewatering in Springconfined Water Area[J].Construction Technology,2024,53(10):51-56.
[9] 李飞飞，高福华，牛真茹，等.合肥地铁4号线和平路站深基坑涌水量预测分析[J].施工技术，2018,47(S1):1343-1348.LI Feifei,GAO Fuhua,NIU Zhenru,et al.Prediction and analysis of water inflow in deep foundation excavation of heping road station of Hefei metro line 4[J].Construction Technology,2018,47(S1):1343-1348.
[10] 黄应超，徐杨青.深基坑降水与回灌过程的数值模拟分析[J].岩土工程学报，2014,36(S2):299-303.HUANG Yingchao,XU Yangqing.Numerical simulation analysis of dewatering and recharge process of deep foundation pits[J].Chinese Journal of Geotechnical Engineering,2014,36(S2):299-303.
[11] 王国富，王倩，路林海，等.济南轨道交通某深基坑降水与回灌数值分析[J].地下空间与工程学报，2017,13(5):1280-1288.WANG Guofu,WANG Qian,LU Linhai,et al.Numerical analysis on dewatering and recharging of a deep foundation pit of Jinan railway[J].Chinese Journal of Underground Space and Engineering,2017,13(5):1280-1288.
[12] 马昌慧，毛云，黄魏，等.帷幕在降水条件下对基坑周边渗流及变形影响的研究[J].岩土工程学报，2014,36(S2):294-298.MA Changhui,MAO Yun,HUANG Wei,et al.Effects of dewatering methods on seepage and deformation of foundation pits[J].Chinese Journal of Geotechnical Engineering,2014,36(S2):294-298.
[13] 郑宇.某地铁基坑降水的数值模拟分析[J].福建建设科技，2022(4):43-46.ZHENG Yu.Numerical simulation analysis of the dewatering in a subway foundation pit[J].Fujian Construction Science & Technology,2022(4):43-46.
[14] 刘志伟.地铁车站深基坑降水三维数值模拟分析[J].城市勘测，2020(6):187-192.LIU Zhiwei.Three-dimensional numerical simulation analysis of deep foundation pit dewatering of metro station[J].Urban Geotechnical Investigation & Surveying,2020(6):187-192.
[15] 徐亚萍.含水层水力特征及基坑降水数值模拟分析[D].苏州：苏州大学，2022.XU Yaping.Analysis of hydraulic characteristics of aquifer and numerical simulation of foundation pit dewatering[D].Suzhou:Suzhou University,2022.
[16] 龚英杰.富水砂层悬挂式止水帷幕适用性试验与分析[D].哈尔滨：哈尔滨工业大学，2017.GONG Yingjie.Applicability test and analysis of pensile curtain for water-rich sand stratum[D].Harbin:Harbin Institute of Technology,2017.
[17] 蔡娇娇.落底式止水帷幕条件下承压含水层基坑降水设计方法研究[D].武汉：中国地质大学，2018.CAI Jiaojiao.Study on dewatering design method of foundation pit with drop waterproof curtain in confined aquifer[D].Wuhan:China University of Geosciences,2018.
[18] 隋晓岚.扬中地区含粉砂夹层淤泥质土场地基坑降水技术研究[D].镇江：江苏科技大学，2020.SUI Xiaolan.Study on foundation pit dewatering technology in muddy soil site with silty sand interlayer in Yangzhong area[D].Zhenjiang:Jiangsu University of Science and Technology,2020.
[19] 徐铭霜.某沿海地区海水入侵动态变化规律及防治措施研究[D].青岛：青岛理工大学，2022.XU Mingshuang.Research on the dynamic variation rule of seawater intrusion and controlling measures in a coastal region[D].Qing-dao:Qingdao University of Technology,2022.
[20] 钱林根，李鹏举，谢致清，等.设置水平隔水帷幕的基坑降水开挖对周边环境的影响分析[J].河北工业科技，2022,39(1):49-55.QIAN Lingen,LI Pengju,XIE Zhiqing,et al.Analysis on the influence of foundation pit dewatering and excavation with horizontal waterproof curtain on surrounding environment[J].Hebei Journal of Industrial Science and Technology,2022,39(1):49-55.
[21] 李光明，李明生.悬挂式止水帷幕基坑降水控制措施研究[J].地下空间与工程学报，2020,16(3):921-932.LI Guangming,LI Mingsheng.Research on control measures unclosed curtain for cutting off drains on dewatering of foundation pit[J].Chinese Journal of Underground Space and Engineering,2020,16(3):921-932.
[22] 钟建文，李罡，牛磊，等.基于抽水试验的参数反演和基坑降水过程数值分析[J].工程勘察，2019,47(7):36-41.ZHONG Jianwen,LI Gang,NIU Lei,et al.Parameter inversion based on pumping test and numerical analysis of dewatering process in deep excavation[J].Geotechnical Investigation & Surveying,2019,47(7):36-41.
[23] 吴彬，刘磊，党建新.Modflow在石河子某工程基坑降水设计中的应用[J].新疆农业大学学报，2010,33(4):369-372.WU Bin,LIU Lei,DANG Jianxin.Application of Modflow to precipitation design of an engineering in Shihhotze[J].Journal of Xinjiang Agricultural University,2010,33(4):369-372.
[24] 许锡金，李东霞.基坑降水引起地面沉降计算方法研究[J].岩土工程技术，2004,18(4):194-198.XU Xijin,LI Dongxia.Study on calculating method of ground subsidence caused by pit dewatering[J].Geotechnical Engineering Technique,2004,18(4):194-198.
[25] 刘厚成，郭启军.悬挂式地连墙地铁深基坑地下水渗流场及其变形规律研究[J].土工基础，2021,35(2):91-95.LIU Houcheng,GUO Qijun.Groundwater seepage and deformation of diaphragm wall supported excavations of a subway station[J].Soil Engineering and Foundation,2021,35(2):91-95.
基本信息:
中图分类号:U231.3
引用信息:
[1]刘晨,张瑾,李秋艳,等.青岛某临海地铁基坑疏干井点布置方案及数值优化分析[J].青岛理工大学学报,2026,47(01):19-28+44.
基金信息:
山东省自然科学基金(ZR2021MD005)