The effects of strength parameters on slope failure mechanisms in weak rocks

2016 ◽  
Author(s):  
Ö Dinç ◽  
Z Karaca ◽  
N Işık
Keyword(s):  
Slope Failure ◽  
Failure Mechanisms ◽  
Strength Parameters ◽  
Weak Rocks

Slope Failure Mechanisms due to Seepage: Three-Dimensional Soil Block Experiments

2008 ◽  
Author(s):  
Maria Chu-Agor ◽  
Rachel M Cancienne ◽  
Garey A Fox ◽  
Glenn V Wilson
Keyword(s):  
Slope Failure ◽  
Failure Mechanisms ◽  
Three Dimensional ◽  
Soil Block

scholarly journals Bank Protection Structures along the Brahmaputra-Jamuna River, a Study of Flow Slides

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2588 ◽  
Author(s):  
Maarten van der Wal
Keyword(s):  
Slope Failure ◽  
Research Question ◽  
Failure Mechanisms ◽  
Flood Plain ◽  
Design Guidelines ◽  
Test Facility ◽  
Training Structures ◽  
Bank Protection ◽  
Flow Slides ◽  
River Training

The planform of the Brahmaputra-Jamuna River followed its natural path in Bangladesh until the construction of bank protection works started to save Sirajganj from bank erosion since the 1930s. Several so-called hardpoints such as groynes and revetments were constructed in the period 1980–2015 and the Jamuna Multipurpose Bridge was opened in 1998. The Brahmaputra Right Embankment and other projects had saved the western flood plain from inundation during monsoon floods. These river training works experienced severe damage by geotechnical failures, mostly flow slides. A flow slide is an underwater slope failure because of liquefaction or a breaching process in the subsoil or a combination of both. The design of most of these training works did not consider the risk of damage by flow slides. All descriptions of the observed damages show that scour phenomena in the channel close to a river training work are a cause of flow slides, besides pore water outflow. The research question was: how can the design of river training works be improved to reduce the risk of damage by flow slides? The main part of the investigation was focussed on reducing local scour holes near river training works. The most promising results are river training works with gentle bank slopes, permeable groynes, bed protections in dredged trenches with gentle side slopes, and methods to increase locally the bearing capacity of the subsoil. It is recommended to increase the knowledge of the failure mechanisms in the Brahmaputra-Jamuna River by improved monitoring in the field, the setup of a database with descriptions of all observed flow slides and the circumstances in which they occur. In addition to these recommendations, a field test facility is proposed to verify the knowledge of the failure mechanisms in that river. These activities will optimise the design of new river training structures with a very low risk of damages by flow slides and geotechnical instabilities and they will contribute to an improvement of the current design guidelines for river training structures.

Mechanism of Rock Slope Failure in Selected Quarries in Oyo State, Nigeria

2007 ◽  
Vol 18-19 ◽  
pp. 13-19
Author(s):  
J.M. Akande ◽  
M.A. Idris
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Failure Mechanisms ◽  
Slope Angle ◽  
Plane Failure ◽  
Bedding Planes ◽  
East Region ◽  
West Region ◽  
South West ◽  
South West Region

Rock slope failure mechanisms were assessed in this study using KOPEC and RCC quarries as case studies in Oyo state. Discontinuities such as joints and bedding planes were obtained through face mapping and scanline survey of the excavated slopes of the quarries. Stereographic projections of the discontinuities were generated using ROCKPACK III and the stereonets analyzed in accordance with Markland’s plane failure analysis. The results of the analyses show that there are possibilities of plane failures in the south- east region of KOPEC quarry slope face and south –west region of RCC quarry slope face. It is therefore recommended that constant monitoring of the slope failure should be done and the slope angle should be less than 700 and 600 for KOPEC quarry and RCC quarry respectively.

scholarly journals Runout analysis and mobility observations for large open pit slope failures

2017 ◽  
Vol 54 (3) ◽  
pp. 373-391 ◽  
Author(s):  
John Whittall ◽  
Erik Eberhardt ◽  
Scott McDougall
Keyword(s):  
Rock Mass ◽  
Slope Failure ◽  
Current Practice ◽  
Slope Angle ◽  
Management Plan ◽  
Open Pit ◽  
Controlled Environment ◽  
Slope Failures ◽  
Weak Rocks ◽  
Fall Height

Objectively forecasting the runout of a potential open pit slope failure, in addition to identifying the failure itself, is a critical component of a mine’s risk management plan. Recent losses arising from large open pit slope failures demonstrate shortcomings in current practice. A dataset of 105 pit slope failures was compiled to compare open pit runout trends against established empirical runout relationships for natural landslides. Fahrböschung angle versus volume and Fahrböschung angle versus slope angle relationships provide reasonable runout estimates. Open pit slopes have the advantage of removing the influence of morphological features, vegetation, and liquefiable substrates while controlling the travel path angle and roughness. In such a controlled environment, landslide mobility has a strong sensitivity to slope angle, material properties, and fall height, and is only modestly sensitive to volume. A grouping of highly mobile open pit slope cases involving weathered, saturated, collapsible rock mass materials exceed expected runout distances when compared with established runout trends. This suggests mobility for these weaker rock masses is controlled by pore pressures mediating basal friction. The result is that two different runout exceedance trends are observed based on whether the unstable rock mass involves fresh, strong rocks or weathered weak rocks.

Sign in / Sign up

Export Citation Format

Share Document