GEOLOGICAL RISK ASSESSMENT ON GUIDELINE FOR PREVENTION OF LABOR ACCIDENTS CAUSED BY SLOPE FAILURE DURING SLOPE CUTTING WORKS AND MONITORING OF SLOPE MOVEMENT

2021 ◽  
Vol 77 (1) ◽  
pp. 1-13
Author(s):  
Tatsuya SIBATA ◽  
Kazuya ITOH ◽  
Ryuichi SUGIYAMA
Keyword(s):  
Risk Assessment ◽  
Slope Failure ◽  
Slope Movement

scholarly journals SLOPE FAILURE RISK ASSESSMENT MODELING USING TOPOGRAPHIC DATA AND NUMERICAL CALCULATION OF SOIL CONSERVATION BY TREE ROOT SYSTEMS

2019 ◽  
Vol IV-2/W5 ◽  
pp. 217-222
Author(s):  
T. Mori ◽  
T. Sugiyama ◽  
I. Hosooka ◽  
M. Nakata ◽  
K. Okano ◽  
...  
Keyword(s):  
Risk Assessment ◽  
At Risk ◽  
Slope Failure ◽  
Forest Type ◽  
Heavy Rain ◽  
Root Systems ◽  
Topographic Data ◽  
Relative Risk Assessment ◽  
External Forces ◽  
Heavy Rains

<p><strong>Abstract.</strong> In Japan, the frequency of sudden heavy rain events has recently increased, causing slope failures that in turn increase rates of damage to transit infrastructure such as railways and roads. To reduce this damage, there is a need to identify locations near railroad tracks that are at risk of slope failure. Thus, an assessment that predicts whether or not damage will occur due to external forces such as heavy rains is required, rather than a simple relative risk assessment based on identifying locations similar to those damaged in previous events. In this study, we developed a method for time series stability assessment of slopes during heavy rains using digital topographic data. This method uses topographic data to estimate topsoil thickness, which contributes to stability, and soil strength, which is affected by the root systems of vegetation on slopes. Using differences in these parameters between tree species and forest type, we were able to calculate slope stability and simulate slope failure during rainfall. The simulations allowed us to evaluate locations along routes where previous failures occurred, and to identify at-risk locations that have not yet experienced slope failure. This approach will improve forest management based on risk assessments for intensifying heavy rains.</p>

Pipeline Response to Slope Movement and Evaluation of Pipeline Strain Demand

2014 ◽  
Author(s):  
Abdelfettah Fredj ◽  
Aaron Dinovitzer
Keyword(s):  
Slope Failure ◽  
Smooth Particle Hydrodynamic ◽  
Slope Movement ◽  
Soil Conditions ◽  
Burial Depth ◽  
Design Standards ◽  
Element Analysis ◽  
Modeling Tools ◽  
Soil Movement ◽  
Codes Of Practice

Pipelines installed on active slopes can be exposed to slope failure mechanisms. The soil movement can introduce substantial axial and bending strains on buried pipeline, and possibly damage. The techniques to predict pipeline displacements, loads, stress or strains are not well described in design standards or codes of practice. The practice of using finite element analysis of soil-pipe interaction has developed in recent years and is proving to be a useful tool in evaluating the pipeline behavior in response to slope movement. A description of advanced pipe soil interaction modeling tools and their validation against full scale trails has been previously presented. This paper describes the ongoing work involved in a study investigating the mechanical behavior of buried pipelines interacting with active slope movement and evaluation of pipeline strain demand. Detailed pipe-soil interaction analyses were completed with a 3D continuum SPH (Smooth Particle Hydrodynamic) model to examine the pipeline behavior and evaluate the pipeline strain demand in relation to key parameters. This includes the effect of soil movement mechanism, pipeline geometry (D/t), material grade, pipeline burial depth and soil conditions and properties. Sample results of the application of the validated 3D continuum modeling process will be presented. The strain demand determined from the analyses were compared with calculated CSA-Z662 strain limit design, local FEA analyses and BS 7910. These results are being used to develop generalized trends in pipeline response to slope movements.

Multi Tiered Approach to Slope Movement Management: Case Study

2012 ◽  
Author(s):  
Millan Sen ◽  
John Richmond ◽  
Aaron Dinovitzer ◽  
Abdelfettah Fredj
Keyword(s):  
Stress Analysis ◽  
Slope Failure ◽  
Action Plan ◽  
Large Diameter ◽  
Mass Movement ◽  
Strain Analysis ◽  
Slope Movement ◽  
Soil Movement ◽  
Slope Movements ◽  
Inspection Data

A major slope in southern Manitoba is currently experiencing deep seated movements of approximately 60mm per year. This 20m high × 70m long slope contains a pipeline right of way with five large diameter crude oil lines that were constructed from 1950–1998. It is estimated that the slope has moved over 3 meters since the pipeline installations. Management of the effects of this slope movement on the pipelines has involved cross-functional strategies that include geotechnical, integrity, and stress evaluations. The slope is assessed annually by a geotechnical engineer, and the most likely cause for the slope movements has been determined. Slope monitoring equipment has been installed at key locations and is monitored at frequent intervals. A toe berm has been installed to prevent lower slope failure at the creek bed that is located at the slope toe. A finite element stress analysis, which considers the interaction between the soil movement and pipeline, has been generated. This stress analysis evaluated the pipeline stresses due to the slope movements to date, and also due to a possible sudden mass movement. The results are backed up by a bending strain analysis based on inertial in-line inspection data was conducted for several of the lines. This paper presents an overview of the engineering assessment considering structural, material, geotechnical and operational concerns involved in developing an integrity management action plan.

scholarly journals Large-area damage prediction system based on finite element method for risk assessment of seismic slope failure in mountains area

2008 ◽  
Vol 45 (3) ◽  
pp. 207-218 ◽  
Author(s):  
Akihiko WAKAI ◽  
Norihiro TANAKA ◽  
Shinro ABE ◽  
Hiroyuki YOSHIMATSU ◽  
Kousei YAMABE ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Risk Assessment ◽  
Finite Element ◽  
Slope Failure ◽  
Prediction System ◽  
Large Area ◽  
Damage Prediction ◽  
Element Method

Probabilistic Risk Assessment of unsaturated Slope Failure Considering Spatial Variability of Hydraulic Parameters

2019 ◽  
Vol 23 (12) ◽  
pp. 5032-5040 ◽  
Author(s):  
Lin Wang ◽  
Chongzhi Wu ◽  
Yongqin Li ◽  
Hanlong Liu ◽  
Wengang Zhang ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Spatial Variability ◽  
Slope Failure ◽  
Probabilistic Risk Assessment ◽  
Hydraulic Parameters ◽  
Probabilistic Risk

Risk assessment of soil slope failure considering copula-based rotated anisotropy random fields

2021 ◽  
Vol 136 ◽  
pp. 104252
Author(s):  
Charles W.W. Ng ◽  
Chuanxiang Qu ◽  
Raymond W.M. Cheung ◽  
Haowen Guo ◽  
Junjun Ni ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Random Fields ◽  
Slope Failure ◽  
Soil Slope
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