基于地统计学及ARCGIS的长春地区粉质黏土渗透性研究

Study on Permeability of Silty Clay in Changchun Area Based on Geostatistics and ARCGIS

依托长春地铁第三轮建设规划项目,采用抽水试验和注水试验方法获得大量试验数据之后,通过采用传统统计学、地统计学以及ARCGIS软件的手段对长春地区粉质黏土渗透系数数据进行了分析研究。结果表明,长春地区粉质黏土属于弱透水层,渗透系数属于中等变异性,空间变异性不强,在较大的尺度上的某种过程是不可忽视的,空间相关性属于中等程度。预测结果显示,长春地区粉质黏土渗透系数空间分布呈现出中间高两侧低的趋势,这是由于中间为伊通河河谷冲积平原而两侧为波状台地的地貌导致。

Relying on the third round of construction planning project of Changchun metro,a large number of test data are obtained by pumping test and water injection test,and then the permeability coefficient data of silty clay in Changchun area are analyzed by means of traditional statistics,geostatistics and ARCGIS software.The results show that the silty clay in Changchun area belongs to the weak permeable layer,the permeability coefficient belongs to the medium variability,and the spatial variability is not strong.A certain process on a large scale cannot be ignored,and the spatial correlation belongs to the medium degree.The prediction results show that the spatial distribution of permeability coefficient of silty clay in Changchun area tends to be higher in the middle and lower in both sides,which is caused by the landform of the alluvial plain of Yitong River Valley in the middle and the wavy platform on both sides.