A laboratory study on ion concentration, electrical conductivity of seepage water and mass movement occurrence
In this study, five sets of seepage tests were conducted in the laboratory to investigate whether ion concentration and electrical conductivity (EC) of the groundwater vary during the process of mass movement triggered by a rise of groundwater level. Soil samples for the tests were collected from two sites, namely, Shen-Mu Village and Feng-Chiou Village in Nantou County, Taiwan. After the soil samples were sieved and prepared in the flumes in a manner to simulate the soil physical conditions in the field, the seepage tests were conducted. The results showed that while the seepage water table gradually increased, for the samples from both sites, the concentration of SO42and EC of the seepage water upstream of the slope failure surface almost remained unchanged before and after mass movement. However those downstream of the slope failure surface started to increase significantly a certain time before the occurrence of general slope failure (collapse). From the five sets of test results, it was also found that the average threshold value of the increment of EC of seepage water for mass movement was 39.2 m s/cm. The standardized quadratic regression equations among soil mass vertical, horizontal displacement values and the increment of EC value were analyzed and established. To forecast the occurrence of mass movement in the field by monitoring groundwater quality is yet to be further studied. However, it is expected that the findings in this study could be a small step toward the ultimate goal.
mass movement debris flow ion concentration electrical conductivity laboratory
J.C. Fan C.H. Liu C.H. Yang P.S. Lin H.Y. Huang
Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Chinese Taip Department of Civil Engineering, National Chung Hsing University, Taichung, Chinese Taipei Soil and Water Conservation Burbeau, Nantou, Chinese Taipei
国际会议
成都
英文
581-591
2007-05-17（万方平台首次上网日期，不代表论文的发表时间）