scholarly journals Key indicator tools for shallow slope failure assessment using soil chemical property signatures and soil colour variables

2017 ◽  
Vol 24 (29) ◽  
pp. 22861-22872
Author(s):  
Rashidi Othman ◽  
Shah Irani Hasni ◽  
Zainul Mukrim Baharuddin ◽  
Khairusy Syakirin Has-Yun Hashim ◽  
Lukman Hakim Mahamod
Keyword(s):  
Chemical Property ◽  
Slope Failure ◽  
Key Indicator ◽  
Failure Assessment ◽  
Soil Chemical Property ◽  
Shallow Slope Failure

scholarly journals Comparative study of material point method and upper bound limit analysis in slope stability analysis

2020 ◽  
Vol 2 (1) ◽  
pp. 44-57
Author(s):  
Lianheng Zhao ◽  
Nan Qiao ◽  
Zhigang Zhao ◽  
Shi Zuo ◽  
Xiang Wang
Keyword(s):  
Stability Analysis ◽  
Upper Bound ◽  
Limit Analysis ◽  
Slope Failure ◽  
Slip Surface ◽  
Material Point Method ◽  
Material Point ◽  
Critical Slip Surface ◽  
The Stability ◽  
Upper Bound Limit Analysis

Abstract The upper bound limit analysis (UBLA) is one of the key research directions in geotechnical engineering and is widely used in engineering practice. UBLA assumes that the slip surface with the minimum factor of safety (FSmin) is the critical slip surface, and then applies it to slope stability analysis. However, the hypothesis of UBLA has not been systematically verified, which may be due to the fact that the traditional numerical method is difficult to simulate the large deformation. In this study, in order to systematically verify the assumption of UBLA, material point method (MPM), which is suitable to simulate the large deformation of continuous media, is used to simulate the whole process of the slope failure, including the large-scale transportation and deposition of soil mass after slope failure. And a series of comparative studies are conducted on the stability of cohesive slopes using UBLA and MPM. The proposed study indicated that the slope angle, internal friction angle and cohesion have a remarkable effect on the slip surface of the cohesive slope. Also, for stable slopes, the calculation results of the two are relatively close. However, for unstable slopes, the slider volume determined by the UBLA is much smaller than the slider volume determined by the MPM. In other words, for unstable slopes, the critical slip surface of UBLA is very different from the slip surface when the slope failure occurs, and when the UBLA is applied to the stability analysis of unstable slope, it will lead to extremely unfavorable results.

Preserving Critical Stormwater Storage Assets at Pipeline Terminal

2020 ◽  
Author(s):  
Vincent Huang ◽  
David J. Walter ◽  
Curtis R. Treen ◽  
John A. Richmond
Keyword(s):  
Slope Failure ◽  
Storm Events ◽  
Geotechnical Investigation ◽  
Shear Key ◽  
Failure Assessment ◽  
Close Proximity ◽  
Stormwater Pond ◽  
High Precipitation ◽  
Petroleum Storage ◽  
Northern Alberta

Abstract A slope failure compromised the integrity of a critical stormwater storage facility at a petroleum storage terminal within northern Alberta. Through periodic ground inspections and a review of LiDAR and aerial imagery, significant lateral deformation of a lined stormwater pond was identified. The potential for pond overflow and uncontrolled stormwater release into the natural environment due to compromised discharge outlets and liner integrity posed an operational and environmental risk. A fast-tracked review and assessment of both the historical and as-built construction details, a good understanding of the regional geology, and geotechnical investigation and instrumentation were required to identify remedial measures that could be implemented to restore the pond prior to the onset of major storm events. Geotechnical investigation and assessment showed weak zones in the bedrock at shallower depths than were historically encountered at the site. Spatial constraints, uncontrolled fill placement in close proximity to the pond, expansion of the pond following original construction, and compromised subsurface drainage were identified as factors that may have contributed to the failure. Assessment of remedial options considered impacts relative to both local and global factors of safety. The selected remedial option was a combination of slope unloading, shear key construction, and improved drainage with the design and construction occurring within a timeframe of 3 months to minimize the time that the pond was out of service. The paper highlights the challenges associated with the slope unloading and shear key construction that were required to control the ground movements. An approach involving sequential excavation and replacement was adopted to manage the risks associated with shear key construction. In addition, directional drill methods were incorporated to install some of the drainage measures due to the risk associated with an open cut approach. The project was fast-tracked to minimize exposure to high precipitation and limited stormwater storage capacity.

scholarly journals Seismic Bearing Capacity of Strip Footings on Cohesive Soil Slopes by Using Adaptive Finite Element Limit Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Weihua Luo ◽  
Minghua Zhao ◽  
Yao Xiao ◽  
Rui Zhang ◽  
Wenzhe Peng
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Limit Analysis ◽  
Slope Failure ◽  
Slope Angle ◽  
Cohesive Soil ◽  
Upper And Lower Bounds ◽  
Adaptive Finite Element ◽  
Soil Slopes ◽  
Seismic Bearing Capacity

By employing adaptive finite element limit analysis (AFELA), the seismic bearing capacity of strip footing on cohesive soil slopes are investigated. To consider the earthquake effects, the pseudostatic method is used. The upper and lower bounds for the seismic bearing capacity factor (Nce) are calculated, and the relative errors between them are found within 3% or better by adopting the adaptive mesh strategy. Based on the obtained results, design tables and charts are provided to facilitate engineers use, and the effects of footing position, undrained shear strength, slope angle, slope height, and pseudostatic acceleration coefficient are studied in detail. The collapse mechanisms are also discussed, including overall slope failure and foundation failure.

Limit Analysis on Stability of Cracked Slope Induced by Earthquake

2011 ◽  
Vol 243-249 ◽  
pp. 2780-2785 ◽  
Author(s):  
Yu Ding ◽  
Chao Dang ◽  
Yu Bin Shao ◽  
Xiao Dong Zou
Keyword(s):  
Slope Stability ◽  
Crack Propagation ◽  
Upper Bound ◽  
Limit Analysis ◽  
Slope Failure ◽  
Earthquake Epicenter ◽  
Earthquake Intensity ◽  
Deformation And Failure ◽  
Rainwater Infiltration ◽  
Filling Water

Intense earthquake shaking inevitably ruptures the rockmass along the fissures and bursts mountainous slopes, and these understable slopes are namely cracked slopes. For such slopes, aftershocks, rainwater infiltration and others factors will inevitably induce crack propagation and the crack thus gradually accumulates to be the cutting boundary that controls the slope deformation and failure. To understand how the slope stability varies in the process of cracking expanding, upper bound approach is employed to assess the cracked slope in Wenchuan earthquake epicenter considering the effects of crack propagation, rainwater infiltrating and earthquake. The results conducted in this paper indicate that the crack propagation lowly reduces the slope stability and it does not directly destabilize the slope. But the crack length owing to propagation inevitably increases the probability of slope failure, which more depend on the filling water in the crack and the earthquake intensity.

Probabilistic approach for failure assessment of steel structures in fire by means of plastic limit analysis

2014 ◽  
Vol 68 ◽  
pp. 16-29 ◽  
Author(s):  
E. Nigro ◽  
A. Bilotta ◽  
D. Asprone ◽  
F. Jalayer ◽  
A. Prota ◽  
...  
Keyword(s):  
Limit Analysis ◽  
Probabilistic Approach ◽  
Steel Structures ◽  
Plastic Limit ◽  
Failure Assessment ◽  
Plastic Limit Analysis ◽  
In Fire
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