偶极子在城区渗流场的结构物模拟中的应用  

Application of dipole to simulating structures in urban seepage field

作　　者：叶锋[1,2] 曹洪[2] 董志良[1] 

机构地区：[1]中交四航工程研究院有限公司,广州510230 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510641

出　　处：《岩土力学》2010年第10期3324-3328,共5页Rock and Soil Mechanics

基　　金：2004年广州市建设科技发展基金计划资助(穗建技[2004]520号文);广东省科技计划项目(粤科计字[2008]144号)"城市地下空间开发对地下水环境影响的研究"(No2008B030302037)

摘　　要：城区渗流场中地下阻水结构物众多,由于结构物的角点为奇异点,而且结构物的尺寸跟整个城区渗流场的尺寸相比非常小,这导致现有的计算方法难以对城区渗流场进行模拟分析。针对城区渗流场的这些特点,通过引进流体力学的复势、偶极子等理论,采用抽注水井对结构物进行模拟。通过控制井流量的大小,以形成强弱程度不同的阻水效果,而单元尺寸可以以井点间距为尺度,用较少的节点和单元即可对地下结构物进行处理,达到简化计算的目的。抽注水井法是一种简化的模拟算法,它忽略了结构物附近局部区域流场失真的情况,强调在宏观上与真实流场接近。Numerous impermeable underground structures exist in urban seepage field.Since the corner of the structure is singular point and the dimension of the structure is negligibly small compared with the whole urban seepage field,it is difficult to model seepage field in urban area with existing methods.Invoking the theory of complex potential,dipole,etc,pumping well and injection well are introduced to simulate structures.Different effects of resistivity water is formed by means of controlling the flow of wells.Furthermore,the size of element can be much bigger than traditional method;and then less nodes and elements are probably used to simulate underground structures.In a word,the proposed method is a simplified method which overlooks the local unrealistic flow field around structures but resolves the macroscopic seepage field reasonably well.

关 键 词：城区地下水 结构物 偶极子 井 有限元 

分 类 号：O357[理学—流体力学]