基于三维数值模拟的深基坑降水设计研究
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摘要
深基坑降水方案设计的合理性是决定地铁施工成功的关键性因素,采用数值模拟进行计算分析是一种行之有效的方法。以上海地铁14号某地铁站深基坑降水工程为例,根据模拟区的工程地质和水文地质条件等,采用Visual Modflow有限差分法建立了三维地下水渗流模型对深基坑降水进行数值模拟,确定深基坑降水方案,此外,还探讨了深基坑降水对周边环境地面沉降的影响,进一步验证了方案设计的准确性。
The rationality of deep foundation pit dewatering scheme is the key factor that determines the success of subway construction,we usually use the numerical simulation to calculate and analyze the design. Visual Modflow finite difference method was used to establish a 3 D groundwater flow model for numerical simulation of deep foundation pit dewatering of Shanghai Metro Line No.14,based on the engineering geology and hydrogeology conditions of the simulation area. On the basis of simulation results,the deep foundation dewatering scheme was defined. In addition,the impact of deep foundation pit dewatering on ground subsidence was also explored,further verifying the accuracy of the design.
The rationality of deep foundation pit dewatering scheme is the key factor that determines the success of subway construction,we usually use the numerical simulation to calculate and analyze the design. Visual Modflow finite difference method was used to establish a 3 D groundwater flow model for numerical simulation of deep foundation pit dewatering of Shanghai Metro Line No.14,based on the engineering geology and hydrogeology conditions of the simulation area. On the basis of simulation results,the deep foundation dewatering scheme was defined. In addition,the impact of deep foundation pit dewatering on ground subsidence was also explored,further verifying the accuracy of the design.
引文
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[3] 张治国,徐晨,刘明等. 考虑基坑降水开挖影响的运营隧道变形分析[J]. 中国矿业大学学报,2015,44(2):241～248.
[4] 陈兴贤,骆祖江,安晓宇等. 深基坑降水三维变参数非稳定渗流与地面沉降耦合模型[J]. 吉林大学学报·地球科学版,2013,43(5):1572～1578.
[5] 许程. 南京某深基坑工程降水试验分析[J]. 城市勘测,2015(6):154～157+161.
[6] 张杰青,施木俊,彭汉发等. 武汉市深厚互层土基坑地下水控制设计[J]. 城市勘测,2010(4):160～162.
[7] 丁智,程围峰,胡增燕等. 杭州地铁人民广场站深基坑降水研究[J]. 铁道工程学报,2014(1):89～94.
[8] 吴意谦. 潜水地区地铁车站深基坑降水开挖引起的变形研究[D]. 兰州:兰州理工大学,2016.