Model tests on rock slopes prone to wedge sliding and some case histories from recent earthquakes

2019 ◽  
pp. 492-498
Author(s):  
H. Kumsar ◽  
Ö. Aydan
Keyword(s):  
Model Tests ◽  
Rock Slopes ◽  
Case Histories ◽  
Wedge Sliding ◽  
Recent Earthquakes

An algorithm for the 3D ROck Slope Kinematic Analysis (ROKA) based on RPAS digital photogrammetry data.

2021 ◽  
Author(s):  
Niccolò Menegoni ◽  
Daniele Giordan ◽  
Cesare Perotti
Keyword(s):  
Kinematic Analysis ◽  
Rock Slope ◽  
Traditional Approach ◽  
Rock Slopes ◽  
Digital Photogrammetry ◽  
Modes Of Failure ◽  
Wedge Sliding ◽  
Flexural Toppling ◽  
The Stability ◽  
Digital Outcrop

<p>Among the several adopted methods for the kinematic analysis of the possible modes of failure that could affect a rock slope, the Markland test is the most used. Whereas, it has the advantage of being simple and fast, it has some limits, as the impossibility to manually consider the several different slope orientations and their interaction with the discontinuity dimensions and positions.</p><p>Recently, the improvements in the Remote Piloted Aerial System (RPAS) digital photogrammetry techniques for the development and mapping of Digital Outcrop Models (DOMs) have given the possibility of developing new automatized digital approaches. In this study, ROKA (ROck slope Kinematic Analysis) algorithm is presented. It is an open-source algorithm, written in MATLAB language, which aims to perform the kinematic analysis of the stability of a rock slope using the discontinuity measurements collected onto 3D DOMs. Its main advantage is the possibility to identify the possible critical combination between the 3D georeferenced discontinuities and the local surface of the slope. In particular, the critical combinations that can activate the planar sliding, flexural toppling, wedge sliding and direct toppling modes of failures can be detected and highlighted directly on the DOM. Hence, the ROKA algorithm can make the traditional approach for the kinematic analysis of a rock slope more effective, allowing not only to simplify the analysis, but also to increase its detail. This can be very important, in particular, for the analysis of large and complex rock slopes.</p>

scholarly journals Pipeline Performances under Earthquake-Induced Soil Liquefaction: State of the Art on Real Observations, Model Tests, and Numerical Simulations

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Massimina Castiglia ◽  
Tony Fierro ◽  
Filippo Santucci de Magistris
Keyword(s):  
Seismic Hazard ◽  
Numerical Simulations ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Model Tests ◽  
Soil Liquefaction ◽  
Case Histories ◽  
Gas Industry ◽  
Experimental Modelling ◽  
Level Of Knowledge

The design and the manufacture of the oil and gas pipelines are being improved over the years in response to the observed damages and related disastrous effects. The improvements are possible, thanks to the increasing knowledge about pipeline performances in specific contexts. The seismic hazard on buried pipelines has always been of major concern, and the earthquake-induced soil liquefaction effects are among the most important issues to be accounted for in the design. Experiences based on case histories, experimental modelling, and numerical simulations represent the source of understanding of the involved mechanisms, the affecting parameters, and the structure response. Recently, all these aspects are becoming more accurate, thanks to the use of monitoring systems. The protection of pipelines from the seismic hazard is a crucial and challenging issue. This paper provides an overview of the research that has been conducted over the years in the specific framework of soil liquefaction phenomenon. Case histories on pipeline performances, commonly adopted analytical methods, and results of model tests and numerical simulations are summarized with main focus on the level of knowledge achieved up to date and the existing limitations that represent open issues for further development of the research. This study represents a useful background to be adopted from academics and practitioners in order to enhance the methods of analyses of the pipelines, thus improving their performances in the applications of the oil and gas industry.

Dynamic Response and Stability of Un-Reinforced and Reinforced Rock Slopes Against Planar Sliding Subjected to Ground Shaking

2018 ◽  
Vol 12 (04) ◽  
pp. 1841001 ◽  
Author(s):  
Ö. Aydan ◽  
Y. Takahashi ◽  
N. Iwata ◽  
R. Kiyota ◽  
K. Adachi
Keyword(s):  
Dynamic Response ◽  
Numerical Simulations ◽  
Model Tests ◽  
Rock Slopes ◽  
Scaled Model ◽  
Ground Shaking ◽  
Model Experiments ◽  
Actual Rock

The authors have been performing some scaled model tests to investigate the response and stability of rock slopes against planar sliding. In these tests, rockbolts/rockanchors are modeled and their reinforcement effects on rock slopes against planar sliding during ground shaking are investigated. These model tests are also used to check the reliability of the numerical simulations. The authors present the outcomes of both model experiments and numerical simulations and compare their implications on actual rock slopes.

Simplified procedure for estimation of liquefaction-induced settlement and site-specific probabilistic settlement exceedance curve using cone penetration test (CPT)

2013 ◽  
Vol 50 (10) ◽  
pp. 1055-1066 ◽  
Author(s):  
C. Hsein Juang ◽  
Jianye Ching ◽  
Lei Wang ◽  
Sara Khoshnevisan ◽  
Chih-Sheng Ku
Keyword(s):  
Seismic Risk ◽  
Cone Penetration Test ◽  
Lateral Spread ◽  
Model Bias ◽  
Penetration Test ◽  
Case Histories ◽  
Cone Penetration ◽  
Site Specific ◽  
Recent Earthquakes ◽  
Simplified Procedure

Liquefaction often causes damage to infrastructure such as buildings, bridges, and lifelines. Liquefaction-induced ground movements such as settlement and lateral spread are of major concern to engineers who have to evaluate seismic risk. This paper deals with evaluation of liquefaction-induced settlement using a cone penetration test (CPT). Existing CPT-based models often overestimate liquefaction-induced settlement. In this paper, a database of case histories of settlement in recent earthquakes is compiled and used to calibrate the model bias of a CPT-based model, from which a simplified procedure is developed that allows for estimation of the probability of exceeding a specified settlement at a given site. Reasonable results are obtained using the developed simplified CPT-based model, as demonstrated in the examples presented.

scholarly journals Impact of Geological Structures on Rock Slope Stability in The NW Nose (Plunge ) of Surdash Anticline, Sulaimaniya/ NE Iraq

2020 ◽  
pp. 550-566
Author(s):  
Summood A. Hussien ◽  
Manal Sh. Al-Kubaisi ◽  
Ghafor A. Hamasur
Keyword(s):  
Kinematic Analysis ◽  
Road Network ◽  
Geological Structure ◽  
Rock Slope Stability ◽  
Rock Slopes ◽  
Tectonic Structures ◽  
Positive Role ◽  
Stable Conditions ◽  
Wedge Sliding ◽  
The Stability

The road network in Surdash anticline is considered as an important road network connecting lower Dukan town with the touristic upper Dukan town. Dukan lake plays an important role in the social and economic activities of Dukan town and the surrounding areas.For assessing the stability of the rock slopes in the area, 9 stations were selected along the upper Dukan road on both sides of Surdash anticline, and their stability was evaluated by the kinematic analysis using DIPS V6.008 software. Kinematic analysis of the studied stations shows thatplanar sliding is possible in stations No. 1, 2, 3 and 8, while wedge sliding is possible in station No. 5, 6, 7 and 9b. The other stations (No. 4and 9a) are stable. Tectonic structures played an extra paradoxical role in the stability of the rock slopes and the type of failure. In most ofthe selected stations , the geological structure had a negative role, which supported or promoted the failure in the study area. However, in few stations , it had a positive role and converted the slope from unstable to stable conditions. In addition, the presence of incongruent minor syncline folds, especially in the SW-limb of themajor anticline, led to the occurring of wedge sliding instead of plane sliding. 

scholarly journals Rock Slope Stability Assessment Along Rawanduz Main Road, Kurdistan Region

2021 ◽  
Vol 54 (1B) ◽  
pp. 79-93
Author(s):  
Rebaz Qader
Keyword(s):  
Rock Slope ◽  
Slope Instability ◽  
Rock Slope Stability ◽  
Rock Slopes ◽  
Kurdistan Region ◽  
Main Road ◽  
The Road ◽  
Wedge Sliding ◽  
Major Factors ◽  
Type Of Failure

The rock slope instability along the Khalifan-Bekhal-Rawanduz main road has been studied in the southwestern limb of the Bradost anticline (Mountain) and both northeastern and southwestern limb of the Korek anticline (Mountain) in the northeast of the Erbil city, Kurdistan Region, Iraq. The major factors of the instability of the rock slopes in the study area are types of discontinuous and the degree of erosion. Ten stations have been chosen for fieldwork. The expected failure types that may occur along the road are plane sliding and wedge sliding. This research is mainly focused on the type of failure along the rock slope and the factor that affect the instability of the studied slopes and have found that they are slope orientation and geometry of the discontinuity. Different remediation methods are proposed for the studied rock slopes base on rock slope analysis. The rock slopes along the road require continuous monitoring because of their hazard conditions.

Case Histories: Fact and Fiction

1958 ◽  
Vol 3 (10) ◽  
pp. 318-319
Author(s):  
ALBERT ELLIS
Keyword(s):  
Case Histories
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