摘要
在进行抽水试验时,多将含水层看作为均质各向同性的,而事实上也有可能是各向异性的含水层,从而得到的含水层参数值不真实。该文分别以描述均质各向同性与各向异性情况下的非稳定流问题的解析解为基础,在满足直线图解法适用条件的情况下,分析了3组实际抽水试验数据,计算了两种情况下的含水层参数。经讨论表明:1)如果将各向异性情况下的含水层按各向同性处理,由各个观测孔s-t数据得到的弹性释水系数数值间会有较大的差别,据此提出了判断含水层是否为各向异性的初步方法;2)在利用直线图解法时,应当进行后检验,检查是否满足其适用条件。
In order to estimate aquifer parameters by data of pumping tests, it is mostly assumed that the aqui- fer is homogeneous and isotropic. However, in fact, the aquifer may be homogeneous anisotropic one which re- sulting in untrue values of aquifer parameters. Based on the analytical solutions which descript the problems of unsteady flow in the ease of homogeneous isotropic and anisotropic and the applicable conditions of linear graphic method are met, 3 groups of practical pumping test data were analyzed and the aquifer parameters are calculated in both cases. The results after discussion show that, 1 ） if the anisotropic aquifer is treated as isotro- pic one, there will be larger difference between the values of elastic releasing coefficient estimated from s - t data of different observation wells, and based on this, a method to determine whether the aquifer is isotropic or not is presented here; 2） when the linear graphical method is applied, it is necessary to check whether the ap- plicable conditions of linear graphical method are met or not after first estimation of aquifer parameters.
出处
《勘察科学技术》
2012年第6期5-9,共5页
Site Investigation Science and Technology
基金
国家863计划课题"污灌农田及退化土壤修复关键技术"(2012AA101404-12)
关键词
含水层参数
各向异性
抽水试验数据
判别方法
aquifer parameters
anisotropy
pumping tests data
discrimination method
