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Geosciences
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Slope Stability Analyses and Remedial Measure of Failed Slopes
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Slope Stability Analyses and Remedial Measure of Failed Slopes

A special issue of Geosciences (ISSN 2076-3263).

Deadline for manuscript submissions: closed (20 April 2022) | Viewed by 16728

Special Issue Editors

Dr. Sadik Khan

E-Mail Website
Guest Editor
Department of Civil and Environmental Engineering, Jackson State University, 1400 J.R. Lynch Street, JSU BOX 17068, Jackson, MS 39217-0168, USA
Interests: landslide investigation and repair; smart infrastructure; climate adaptive design protocol
Special Issues, Collections and Topics in MDPI journals
Dr. Asif Ahmed

E-Mail Website
Guest Editor
College of Engineering, State University of New York Polytechnic Institute (SUNY Poly), Utica, NY 12203 USA
Interests: slope stability; numerical modeling; unsaturated soils; instrumentation; machine learning in geotechnical engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Landslides represent a massive threat to our communities and have the potential to cause significant damage to infrastructures. Various efforts are ongoing around the world to identify and mitigate landslides. The current Special Issue aims to combine fundamental work on landside investigation with monitoring and with the development of sustainable, innovative, and cost-effective repair techniques. Any basic work related to the investigation of landslide stressors, such as excessive rainfall and infiltration, is therefore highly encouraged. Advanced investigation and monitoring that cover geophysical techniques, field instrumentation, and remote sensing would also be ideal. Finally, the Special Issue aims to include multiple case studies on innovative landslide repair methods.

You may choose our Joint Special Issue in CivilEng.

Dr. Sadik Khan
Dr. Asif Ahmed
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Geosciences is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • rainfall-induced slope failures
  • geophysical technique and remote sensing
  • instrumentation and modeling
  • sustainable and cost-effective landslide repair techniques

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Published Papers (5 papers)

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Research

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14 pages, 3746 KiB  
Article
Effect of Freezing-Thawing Cycles on the Elastic Waves’ Properties of Rocks
by Muriel Gasc-Barbier and Véronique Merrien-Soukatchoff
Geosciences 2022, 12(3), 103; https://doi.org/10.3390/geosciences12030103 - 22 Feb 2022
Cited by 6 | Viewed by 2427
Abstract
Freezing thawing cycles are known to play an important role in fracture propagation on rock mass and thus in rock slope instabilities. In laboratories, this phenomenon can be studied through the measurement of the velocities of elastic waves. Seven types of rocks differing [...] Read more.
Freezing thawing cycles are known to play an important role in fracture propagation on rock mass and thus in rock slope instabilities. In laboratories, this phenomenon can be studied through the measurement of the velocities of elastic waves. Seven types of rocks differing by their mineralogy and texture were tested (gneiss, basalt, amphibolite, dolomite, sandstone, marble limestone and calcite). Five samples of each rock were tested. All samples were submitted to freezing/thawing cycles following the European Standard describing the tests to determine the frost resistance of natural stone. Elastic waves were recorded on the samples every 14 cycles. The experimentation continued until the rock was macrofissurated. The evolution of the weight of the samples, the velocities of elastic waves, the evolution of the shapes of the waves were recorded to characterize changes over freeze-thaw cycles. In addition, signal processing on the waves allows to compute energy variations as well as the evolution of natural frequencies of the samples. Full article
(This article belongs to the Special Issue Slope Stability Analyses and Remedial Measure of Failed Slopes)
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15 pages, 3737 KiB  
Article
Field Determination of Unsaturated Permeability and Flow Properties through Subgrade Instrumentation
by Asif Ahmed and Sahadat Hossain
Geosciences 2022, 12(2), 95; https://doi.org/10.3390/geosciences12020095 - 18 Feb 2022
Cited by 2 | Viewed by 2438
Abstract
Due to the representation of a particular field condition of soil rather than the real time scenario from laboratory experiments, the selection of unsaturated permeability and flow parameters becomes challenging when conducting numerical modeling. Keeping this in mind, the objective of the study [...] Read more.
Due to the representation of a particular field condition of soil rather than the real time scenario from laboratory experiments, the selection of unsaturated permeability and flow parameters becomes challenging when conducting numerical modeling. Keeping this in mind, the objective of the study was to determine the permeability in both directions along with the unsaturated flow parameters from field data. Although it is conventional to determine the flow parameters from the curve fitting of laboratory results, a novel approach was carried out during the course of study, wherein field soil water characteristic curves were used to determine the unsaturated flow parameters. Two two-lane roads in Kaufman County and Ellis County, Texas were selected for data acquisition and monitoring in this study. For the investigation of in situ moisture content and matric suction, soil moisture and suction sensors were installed at up to a depth of 4.5 m into the ground, while the precipitation was recorded using rain gauges installed at the sites. Field determination yielded hydraulic conductivity values in the range of 10−4 to 10−5 m/s, representing the rapid flow of water due to desiccation cracks on expansive soil. Field-generated unsaturated flow parameters also indicated variability while constructing the SWCC. Finally, PLAXIS 2D was used for the transient flow analysis. The close agreement of the FE results with the direct field measurements validated the estimated flow parameters. The approach described in the study can be used for determining permeability and unsaturated flow parameter values from field data, which offers a dynamic situation in contrast to the static laboratory condition. Full article
(This article belongs to the Special Issue Slope Stability Analyses and Remedial Measure of Failed Slopes)
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18 pages, 5908 KiB  
Article
Examining the Effects of Suction and Nonlinear Strength Envelopes on the Stability of a High Plasticity Clay Slope
by Mengwei Xuan, Jack Montgomery and J. Brian Anderson
Geosciences 2021, 11(11), 449; https://doi.org/10.3390/geosciences11110449 - 31 Oct 2021
Cited by 1 | Viewed by 2251
Abstract
Slope failures in high plasticity clay deposits are common occurrences in many parts of the world. In western and central Alabama, expansive Prairie clays are commonly found, and shallow slope failures have occurred in both fill and cut slopes containing these high plasticity [...] Read more.
Slope failures in high plasticity clay deposits are common occurrences in many parts of the world. In western and central Alabama, expansive Prairie clays are commonly found, and shallow slope failures have occurred in both fill and cut slopes containing these high plasticity clays. The objective of this study was to examine the effects of suction and the use of nonlinear strength envelopes on the embankment stability of a section of highway AL-5. The testing program consisted of fifteen ring shear tests performed using a Bromhead Ring Shear Device. The results of the tests were used to develop both linear and nonlinear fully softened and residual strength envelopes. The saturated strength envelopes are then used in a limit equilibrium slope stability analysis with and without the effects of suction. The results show stability (factor of safety >1) for all cases except the residual friction angle without suction. Given these results, large slope failures are unlikely to occur in this area, but surficial failures and deformations due to creep may be possible. These results demonstrate the importance of considering the effects of suction and nonlinear strength envelopes when examining the potential for shallow slope failures in high plasticity clays. Full article
(This article belongs to the Special Issue Slope Stability Analyses and Remedial Measure of Failed Slopes)
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26 pages, 16120 KiB  
Article
The Geo-Hydro-Mechanical Properties of a Turbiditic Formation as Internal Factors of Slope Failure Processes
by Nunzio Losacco, Osvaldo Bottiglieri, Francesca Santaloia, Claudia Vitone and Federica Cotecchia
Geosciences 2021, 11(10), 429; https://doi.org/10.3390/geosciences11100429 - 17 Oct 2021
Cited by 3 | Viewed by 2127
Abstract
Similar to many inner areas of Southern Europe, the Daunia Apennines are affected by widespread landsliding, often consisting of slow, deep-seated movements. Recurrent acceleration of these landslides causes damage to buildings and infrastructures, severely biasing the socio-economic development of the region. Most landslides [...] Read more.
Similar to many inner areas of Southern Europe, the Daunia Apennines are affected by widespread landsliding, often consisting of slow, deep-seated movements. Recurrent acceleration of these landslides causes damage to buildings and infrastructures, severely biasing the socio-economic development of the region. Most landslides in the area of study occur within clayey units of turbiditic flysch formations, often severely disturbed by tectonic thrust and previous landsliding. The Faeto Flysch (FAE) is one of the most widespread turbiditic formations in the Daunia Apennines and is representative of the tectonised geological formations involved in slope failure. This work, by examining the landslide processes occurring at four pilot sites, aims at connecting the observed mechanisms to the geo-hydro-mechanical setup of FAE in the slopes. It is found that the soil portion of FAE consists of highly plastic clays, resulting in low intrinsic shear strength, and hence controls the initiation and progression of failure in the slopes, as such representing an internal predisposing factor to landsliding. In addition, the presence of fractured rock strata confers a high permeability at the slope scale, with respect to that of the soil matrix. This results in severe piezometric levels in the slope, which represent another internal predisposing factor to failure, and in the ability to induce significant seasonal pore water pressure oscillations down to great depths, connected to rainfall infiltration, thus triggering the recurrent acceleration of the landslides. Full article
(This article belongs to the Special Issue Slope Stability Analyses and Remedial Measure of Failed Slopes)
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17 pages, 4730 KiB  
Case Report
A Geotechnical Investigation of 2017 Chattogram Landslides
by Md. Azijul Islam, Mohammad Shariful Islam and Abhijeet Acharjee Jeet
Geosciences 2021, 11(8), 337; https://doi.org/10.3390/geosciences11080337 - 11 Aug 2021
Cited by 4 | Viewed by 5892
Abstract
In this study, an attempt is made to uncover and discuss the geo-environmental characteristics, triggers, and consequences of a landslide disaster in the Chattogram Hill Tracts (CHT) region of Bangladesh. The hilly areas are composed of Tertiary and Quaternary sediments which have been [...] Read more.
In this study, an attempt is made to uncover and discuss the geo-environmental characteristics, triggers, and consequences of a landslide disaster in the Chattogram Hill Tracts (CHT) region of Bangladesh. The hilly areas are composed of Tertiary and Quaternary sediments which have been folded, faulted, uplifted and, then deeply dissected by rivers and other water bodies. This paper presents a case study on the geotechnical investigation and numerical modeling of the landslides of 13 June 2017. A field visit and soil sample collection, followed by laboratory testing were conducted at the landslide-afflicted areas. The study revealed that the soil type was an important factor behind landslides, while high precipitation, hill cutting, deforestation, and unplanned human settlements act as contributing factors behind the landslide disaster. Extensive analysis of the geotechnical facts has been carried out, and an attempt is made to pinpoint the cause. A finite element modeling was conducted using PLAXIS 2D to investigate the failure mechanism. The numerical modeling results have suggested that most of the hill slopes were susceptible to failure after heavy rainfall. A conclusion is drawn that the landslides were triggered by incessant rainfall infiltrating into the subsoil, which led to a notable increase in its degree of saturation and a simultaneous reduction in suction and shear strength of the soil. Full article
(This article belongs to the Special Issue Slope Stability Analyses and Remedial Measure of Failed Slopes)
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