Next Article in Journal
Subsampling of Regional-Scale Database for improving Multivariate Analysis Interpretation of Groundwater Chemical Evolution and Ion Sources
Next Article in Special Issue
Planning Landslide Countermeasure Works through Long Term Monitoring and Grey Box Modelling
Previous Article in Journal
Appraisal of Temporal Transferability of Cold Region Winter Weather Traffic Models for Major Highway Segments in Alberta Canada
Previous Article in Special Issue
Morphostructural, Meteorological and Seismic Factors Controlling Landslides in Weak Rocks: The Case Studies of Castelnuovo and Ponzano (North East Abruzzo, Central Italy)
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle

Bench-Scale Experiments on Effects of Pipe Flow and Entrapped Air in Soil Layer on Hillslope Landslides

1
Sediment Disaster Prevention Technology Center, Kinki Regional Bureau, MLIT, Ichinono 3027-6, Nachikatsuura-cho, Wakayama Prefecture, Higashimuro-gun 649-5302, Japan
2
National Institute for Land and Infrastructure Management, MLIT, Asahi 1, Ibaraki Prefecture, Tsukuba City 305-0804, Japan
3
CTI Engineering Co., LTD., Onigakubo 1047-27, Ibaraki Prefecture, Tsukuba City 300-2651, Japan
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(3), 138; https://doi.org/10.3390/geosciences9030138
Received: 31 December 2018 / Revised: 11 March 2019 / Accepted: 15 March 2019 / Published: 21 March 2019
(This article belongs to the Special Issue Mountain Landslides: Monitoring, Modeling, and Mitigation)
  |  
PDF [4298 KB, uploaded 21 March 2019]
  |  

Abstract

Soil pipes are commonly found in landslide scarps, and it has been suggested that build-up of pore water pressure due to clogged soil pipes influences landslide initiation. Several researchers have also suggested that entrapped air in the soil layer increases the pore water pressure. We carried out bench-scale model experiments to investigate the influence of soil pipes and entrapped air on the build-up of pore water pressure. We installed a water supply system consisting of an artificial rainfall simulator, and used a water supply tank to supply water to the model slope and artificial pipe. We used two types of artificial pipe: A straight pipe, and a confluence of three pipes. Furthermore, we placed a layer of silica sand on top of the model slope to investigate the effect of entrapped air in the soil layer on the build-up of pore water pressure. Silica sand is finer than the sand that we used for the bulk of the model slope. Our results indicate that, although artificial pipes decrease the pore water pressure when the amount of water supplied was smaller than the pipe drainage capacity, the pore water pressure increased when the water supply was too large for the artificial pipe to drain. In particular, the confluence of pipes increased the pore water pressure because the water supply exceeded the drainage capacity. The results also indicate that entrapped air increases the pore water pressure in the area with relatively low drainage capacity, too. Based on these results, we found that although soil pipes can drain a certain amount of water from a soil layer, they can also increase the pore water pressure, and destabilize slopes. Furthermore, entrapped air enhances the trend that the pore water pressure can increase in the area with relatively low drainage capacity, as pore water pressure increases when too much water is supplied, and the artificial pipe cannot drain all of it. View Full-Text
Keywords: soil pipe; confluence of pipe; entrapped air; landslide; slope stabilization soil pipe; confluence of pipe; entrapped air; landslide; slope stabilization
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Tanaka, Y.; Uchida, T.; Nagai, H.; Todate, H. Bench-Scale Experiments on Effects of Pipe Flow and Entrapped Air in Soil Layer on Hillslope Landslides. Geosciences 2019, 9, 138.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Geosciences EISSN 2076-3263 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top