Water infiltration in loess soils is an important trigger causing landslides, in which the hydraulic conductivity of the loess plays an important role. By analyzing a soil trench and soil samples from the South Jingyang Plateau, northwest China, a loess slope was investigated. A horizontal adit in a Lishi loess layer was also analyzed. Using variable head permeability tests the saturated horizontal hydraulic conductivity (Kh) and saturated vertical hydraulic conductivity (Kv) of the loess samples were measured. Results showed that the majority of the Kh values are larger than the Kv values, indicating that the loess exhibits permeability anisotropy. Lilliefors test was used to determine the normality of the Kh and Kv results. Test results indicate that Kh and Kv measurements of the loess samples collected in the trench and adit all show log-normal distribution, while a number of the Kh and Kv values also reflect a normal distribution. Geo-statistical analysis shows that the spherical model and the Gaussian model provide the best fit variograms of Kh and Kv values along the trench; analysis along the adit indicated the opposite results. The variogram range values suggest that the spatial correlation of loess Kv is greater in the vertical direction in a horizontal plane, while the spatial correlation of Kh in the adit is greater than that in the vertical direction. Loess structure rather than randomness decides the spatial variation of Kh and Kv measurements (except for Kh variation along the adit which depends on both structural factor and randomness). Kh and Kv values of loess tend to decrease with depth; results which can be described by an exponential decay model.
Engineering Geology – Elsevier
Published: Mar 26, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera