Soil-pollutant interaction effects on the soil behavior and the stability of foundation structures

2021 ◽  
pp. 155-163
Author(s):  
Hsai-Yang Fang
Keyword(s):  
Interaction Effects ◽  
Soil Behavior ◽  
The Stability

scholarly journals Numerical Modelling of The Behavior of Tunnel in Soft Surrounding Rock. A Case Study of Djebel El-Ouahch Tunnel, Algeria.

2021 ◽  
Author(s):  
Barkane Aicha ◽  
Sami Mezhoud
Keyword(s):  
Reference Model ◽  
Soil Behavior ◽  
Tunnel Excavation ◽  
Circular Section ◽  
Geological Conditions ◽  
The Stability ◽  
Tunnel Cross Section ◽  
Calculation Code ◽  
Surrounding Soil

Abstract The response of a massif to stresses generated by tunnel excavation depends essentially on the geological conditions, the geometry of the tunnel and its underground position. The major problem related to the construction of these structures is to ensure the stability of the whole tunnel-ground, by controlling the various deformation generated during the constructionIn this context, the present paper examines the effect of these conditions on the behavior of tunnels and the surrounding soil. The study is applied to a real tunnel, in this case the tunnel of Djebel El Ouahch, Algeria was taken as a reference model. The research includes a parametric study to evaluate the effect of several parameters on the behavior of the tunnel and surrounding soil such as the tunnel anchoring depth, the tunnel-soil interface rate, and the shape of the tunnel cross section. The analysis is performed using the PLAXIS 3D TUNNEL calculation code with an elastoplastic Mohr-coulomb model for the soil behavior. The results show that the strongest and most stable position is the mid-deep tunnel with a circular section, with a non-slip interface between the tunnel and the ground. These outcomes can help to understand the effects of various influences parameters which control the stability of the tunnel in a soil with bad characteristics.

Enhancing Sensitivity Diagnostics for Qualitative Comparative Analysis: A Combinatorial Approach

2016 ◽  
Vol 24 (1) ◽  
pp. 104-120 ◽  
Author(s):  
Alrik Thiem ◽  
Reto Spöhel ◽  
Adrian Duşa
Keyword(s):  
Comparative Analysis ◽  
Data Quality ◽  
Qualitative Comparative Analysis ◽  
Interaction Effects ◽  
Combinatorial Approach ◽  
Methodological Research ◽  
The Stability ◽  
Parameter Values

Sensitivity diagnostics has recently been put high on the agenda of methodological research into Qualitative Comparative Analysis (QCA). Existing studies in this area rely on the technique of exhaustive enumeration, and the majority of works examine the reactivity of QCA either only to alterations in discretionary parameter values or only to data quality. In this article, we introduce the technique of combinatorial computation for evaluating the interaction effects between two problems afflicting data quality and two discretionary parameters on the stability of QCA reference solutions. In this connection, we challenge a hitherto unstated assumption intrinsic to exhaustive enumeration, show that combinatorial computation permits the formulation of general laws of sensitivity in QCA, and demonstrate that our technique is most efficient.

scholarly journals Stability Analysis of Durum Wheat Genotypes by Regression Parameteres in Dryland Conditions

2014 ◽  
Vol 62 (5) ◽  
pp. 1049-1056 ◽  
Author(s):  
Mohtasham Mohammadi ◽  
Peyman Sharifi ◽  
Rahmatollah Karimizadeh
Keyword(s):  
Stability Analysis ◽  
Grain Yield ◽  
Durum Wheat ◽  
Triticum Turgidum ◽  
B Value ◽  
Interaction Effects ◽  
Ge Interaction ◽  
Wheat Genotypes ◽  
Cropping Seasons ◽  
The Stability

The objectives of this study were to estimate genotype × environment (GE) interaction effects and to determine the stable durum wheat (Triticum turgidum var. durum Desf.) genotypes for grain yield in warm winter areas of Iran. Twenty durum wheat genotypes, including 18 experimental lines and two local checks were evaluated during three cropping seasons (2004–2006) at five research sites. The combined analysis of variance indicated that the main effects of location and genotype and interaction effects of genotype × year, genotype × location and genotype × year × location were highly significant for grain yield. GE interaction was analyzed using linear regression techniques. There was considerable variation for grain yield among both genotypes and environments. Stability was estimated using the Eberhart and Russell method. Stability analysis of grain yield in different environments showed that the variance of genotypes and genotypes × environment (linear) interactions were significant. Due to the stability analysis, genotype 12 (D68-1-93A-1A//Ruff/Fg/3/Mtl-5/4/Lahn) indicated relatively minimum value for S2d and a b-value close to unity and hence, it may be considered stable for grain yield in all of the environments. The results showed that G10 (Bcr//Memo/goo) also favor for its stability in high yielding environments. The broad sense heritability was 77%, indicating selection should give a good response for grain yield.

The interaction between two coplanar dislocation-type cracks

1966 ◽  
Vol 292 (1428) ◽  
pp. 134-151 ◽  
Keyword(s):  
Cleavage Fracture ◽  
Interaction Effects ◽  
Crystalline Solids ◽  
Dislocation Type ◽  
Deformation Processes ◽  
Shaped Crack ◽  
Complete Fracture ◽  
The Stability

When crystalline solids exhibit cleavage fracture, the associated deformation processes produce wedge shaped microcracks and the criteria for their stability are of paramount importance when discussing the conditions for complete fracture of a solid. Previously, consideration has been given to the behaviour of an isolated wedge shaped crack, but little attention has been given to problems involving distributions of such cracks. The present paper examines the stability of two coplanar wedge shaped cracks, and demonstrates under what conditions interaction effects are important.

scholarly journals Three-Dimensional Stability Analysis of a Homogeneous Slope Reinforced with Micropiles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Shu-Wei Sun ◽  
Wei Wang ◽  
Fu Zhao
Keyword(s):  
Slip Surface ◽  
Three Dimensional ◽  
Failure Surface ◽  
Embedment Depth ◽  
Critical Slip Surface ◽  
Soil Behavior ◽  
Nonlinear Method ◽  
Strength Reduction Technique ◽  
The Stability ◽  
Coulomb Criterion

Micropiles are widely used to reinforce slopes due to their successful performance and fast construction. In this study, a simple nonlinear method is proposed to analyze the stability of a homogeneous slope reinforced with micropiles. This method is based on shear strength reduction technique, in which the soil behavior is described using the nonassociated Mohr-Coulomb criterion and micropiles are modeled as 3D pile elements. A series of slope stability analyses is performed to investigate the coupled mechanism of micropile system, and the optimum of pile position, depth of embedment, and length of truncation are analyzed. Results show that the position of micropile system plays an important role not only in the calculation of the safety factor, but also in locating the failure surface, which demonstrates the dominating coupled effect exists between micropiles and slope. The critical embedment depth of the micropile is about 2 times the length of micropile above the critical slip surface, and the micropiles flexure rather than rotation becomes increasingly prevalent as the depth of micropiles embedment increases. Truncation of micropiles may improve the capacity of the micropile system, and the largest truncation length of micropile is about 1/4 depth of critical slip surface in this study.

Numerical Analysis of Slopes Stability and Shallow Foundations Behavior at Crest under Real Seismic Loading - Reinforcement Effect

2011 ◽  
Vol 324 ◽  
pp. 352-355
Author(s):  
Hani Mekdash ◽  
Fadi Hage Chehade ◽  
Marwan Sadek ◽  
Dalia Abdel Massih ◽  
Elie El Hachem ◽  
...  
Keyword(s):  
Seismic Loading ◽  
Spatial And Temporal Variability ◽  
Soil Behavior ◽  
Dynamic Approach ◽  
Reinforcement Scheme ◽  
Earthquake Effect ◽  
Dynamic Amplification ◽  
The Stability ◽  
Probable Failure ◽  
Elastoplastic Soil

The aim of this paper is to analyze the slopes stability under seismic loading using a global numerical dynamic approach. This approach allows important parameters that are generally ignored by traditional engineering methods such as the soil deformability, the dynamic amplification, non linear soil behavior, the spatial and temporal variability of the seismic loading and the reinforcement element… The present study is conducted by using measures recorded during real earthquakes (Turkey, 1999) & (Lebanon, 2008). Elastoplastic soil behavior analysis leads to monitor the evolution of the slope state after an earthquake and to clarify the most probable failure circles. A parametric study according to the reinforcement length, position, inclination and the number of elements has been studied in order to define the optimal reinforcement scheme for slopes under seismic loading. This study contains also the stability analysis of an existing foundation near the slope’s crest. It will focus on the reinforcement in order to give recommendation for the most appropriate scheme that minimize the settlement of the foundation due to earthquake effect.

Sign in / Sign up

Export Citation Format

Share Document