基于地面沉降控制的基坑围护与工程降水一体化设计方法与应用
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摘要
以深基坑为代表的地下空间开发已成为巨厚松散层沉积区地面沉降的重要因素,显著的不均匀沉降直接影响着重大市政工程设施的运营安全。本文聚焦深基坑减压降水引发的不均匀地面沉降问题,提出了基于地面沉降控制的基坑围护与工程降水一体化设计方法,以上海某在建地铁车站基坑为例,从止水帷幕深度优化设计、减压降水过程优化控制、地面沉降综合监测及浅层地下水人工回灌等方面开展了示范应用探索,取得了较好的地面沉降控制效果,可为深基坑减压降水地面沉降控制提供解决方案。
The development of underground space represented by a deep foundation pit has become an important factor for land subsidence in an ultra-thick loose layer sedimentary area, and its unevenness in space has further affected the secure operating of major municipal engineering facilities. Focusing on the problem of land subsidence caused by deep foundation pit dewatering, this study presents a design method of a foundation pit enclosure and dewatering integration system. Taking the deep foundation pit of a subway station under construction in Shanghai as an example, practical application was carried out by implementing measures such as a waterproof curtain depth design, dewatering process optimization, and land subsidence monitoring and groundwater artificial recharge, achieving good control results. This study provides a successful case that can be used for land subsidence control caused by deep foundation pit dewatering.
The development of underground space represented by a deep foundation pit has become an important factor for land subsidence in an ultra-thick loose layer sedimentary area, and its unevenness in space has further affected the secure operating of major municipal engineering facilities. Focusing on the problem of land subsidence caused by deep foundation pit dewatering, this study presents a design method of a foundation pit enclosure and dewatering integration system. Taking the deep foundation pit of a subway station under construction in Shanghai as an example, practical application was carried out by implementing measures such as a waterproof curtain depth design, dewatering process optimization, and land subsidence monitoring and groundwater artificial recharge, achieving good control results. This study provides a successful case that can be used for land subsidence control caused by deep foundation pit dewatering.
引文
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[8]杨天亮,严学新,王寒梅.水位与沉降双控模式下浅层地下水压力回灌试验研究[J].上海地质,2010,31(4):12-17.Yang T L,Yan X X,Wang H M,et al.Experimental research of shallow aquifer pressure groundwater recharge based on dual control pattern of groundwater level and land subsidence[J].Shanghai Geology,2010,31(4):12-17.
[9]杨天亮.深基坑减压降水地面沉降控制综合分区方法研究[J].上海国土资源,2018,39(2):64-69.Yang T L.Study on comprehensive partition method of land subsidence control induced by engineering dewatering of deep foundation pit[J].Shanghai Land&Resources,2018,39(2):64-69.
[10]刘金宝,严学新.上海市工程建设规范《地质灾害危险性评估技术规程》修订解析[J].上海国土资源,2016,37(4):66-68.Liu J B,Yan X X.Analysis of technical code revision for risk assessment of geological disasters[J].Shanghai Land&Resources,2016,37(4):66-68.
[11]黄鑫磊,何晔,占光辉.深基坑减压降水设计优化与止水帷幕隔水效应分析[J].上海国土资源,2014,35(2):25-27.Huang X L,He Y,Zhan G H.Analysis of the optimization of deepfoundation pit dewatering design and the effect of a waterproof curtain[J].Shanghai Land&Resources,2014,35(2):25-27.
[2]杨天亮.深基坑减压降水引发的地面沉降效应分析[J].上海国土资源,2012,33(3):41-44.Yang T L.Analysis of the land subsidence impact of dewatering of deep foundation pits[J].Shanghai Land&Resources,2012,33(3):41-44.
[3]Yang T L,Yan X X,Wang H M,et al.Comprehensive experimental study on prevention of land subsidence caused by dewatering in deep foundation pit with hanging waterproof curtain[C].Proc.IAHS,92,1-5,2015.
[4]骆祖江,张月萍,刘金宝.深基坑降水与地面沉降控制研究[J].沈阳建筑大学学报(自然科学版),2007,23(1):47-51.Luo Z J,Zhang Y P,Liu J B.Study of deep foundation pit dewatering and land subsidence control[J].Journal of Shenyang Jianzhu University(Natural Science),2007,23(1):47-51.
[5]王建秀,吴林高,朱雁飞,等.地铁车站深基坑降水诱发沉降机制及计算方法[J].岩石力学与工程学报,2009,28(5):1010-1019.Wang J X,Wu L G,Zhu Y F,et al.Mechanism of dewateringinduced ground subsidence in deep subway station pit and calculation method[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):1010-1019.
[6]叶为民,万敏,陈宝,等.深基坑承压含水层降水对地面沉降的影响[J].地下空间与工程学报,2009,5(S2):1799-1805.Ye W M,Wan M,Chen B,et al.Influence of dewatering of confined aquifers on land subsidence during deep excavation[J].Chinese Journal of Underground Space and Engineering,2009,5(S2):1799-1805.
[7]吴建中,王寒梅,杨天亮.浅层地下水人工回灌应用于上海市工程性地面沉降防治的试验研究[J].现代地质,2009,23(6):1194-1200.Wu J Z,Wang H M,Yang T L.Experimental research on artificial recharge to shallow aquifer to control land subsidence due to construction in shanghai city[J].Geoscience,2009,23(6):1194-1200.
[8]杨天亮,严学新,王寒梅.水位与沉降双控模式下浅层地下水压力回灌试验研究[J].上海地质,2010,31(4):12-17.Yang T L,Yan X X,Wang H M,et al.Experimental research of shallow aquifer pressure groundwater recharge based on dual control pattern of groundwater level and land subsidence[J].Shanghai Geology,2010,31(4):12-17.
[9]杨天亮.深基坑减压降水地面沉降控制综合分区方法研究[J].上海国土资源,2018,39(2):64-69.Yang T L.Study on comprehensive partition method of land subsidence control induced by engineering dewatering of deep foundation pit[J].Shanghai Land&Resources,2018,39(2):64-69.
[10]刘金宝,严学新.上海市工程建设规范《地质灾害危险性评估技术规程》修订解析[J].上海国土资源,2016,37(4):66-68.Liu J B,Yan X X.Analysis of technical code revision for risk assessment of geological disasters[J].Shanghai Land&Resources,2016,37(4):66-68.
[11]黄鑫磊,何晔,占光辉.深基坑减压降水设计优化与止水帷幕隔水效应分析[J].上海国土资源,2014,35(2):25-27.Huang X L,He Y,Zhan G H.Analysis of the optimization of deepfoundation pit dewatering design and the effect of a waterproof curtain[J].Shanghai Land&Resources,2014,35(2):25-27.