Étude par éléments finis du comportement à l'arrachement des ancrages injectés dans le roc

1990 ◽  
Vol 17 (2) ◽  
pp. 129-141 ◽  
Author(s):  
Brahim Benmokrane
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rock Mass ◽  
Field Tests ◽  
Element Analysis ◽  
Great Cost ◽  
Quadrilateral Elements ◽  
Failure Loads ◽  
Rock Anchors ◽  
Éléments Finis

The uplift behavior of grouted rock anchors is little known despite their increasing use within the last few years and during which their field of application has been greatly broadened. The behavior of anchors is usually controlled at great cost after installation through field tests. Generally, their design is based on experience and an engineer with lesser experience finds it extremely difficult to design one. Furthermore, present methods for dimensioning anchors generally result in oversizing the anchors' grouted length without a corresponding improvement in the safety factor. To provide a more fundamental approach to designing grouted rock anchors, a finite element analysis of the uplift behavior has been carried out. The results of the analysis using isoparametric quadrilateral elements with eight nodes are presented in this article. Results of failure loads and modes obtained from anchors installed in the field are well predicted by the model. Key words: rock mass, grouted anchor, cement grout, finite elements, uplift of an anchor.

Failure analysis of simple overlap bonding joints and numerical investigation of the adhered tip geometry effect on the joint strength

2021 ◽  
Vol 63 (11) ◽  
pp. 1007-1011
Author(s):  
İsmail Saraç
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Reference Model ◽  
Lap Joints ◽  
Shear Stresses ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Failure Loads ◽  
Previous Experimental Study

Abstract This study was carried out in two stages. In the first step, a numerical study was performed to verify the previous experimental study. In accordance with the previous experimental study data, single lap joints models were created using the ANSYS finite element analysis program. Then, nonlinear stress and failure analyses were performed by applying the failure loads obtained in the experimental study. The maximum stress theory was used to find finite element failure loads of the single lap joints models. As a result of the finite element analysis, an approximate 80 % agreement was found between experimental and numerical results. In the second step of the study, in order to increase the bond strength, different overlap end geometry models were produced and peel and shear stresses in the adhesive layer were compared according to the reference model. As a result of the analyses, significant strength increases were calculated according to the reference model. The strength increase in model 3 and model 5 was found to be 80 % and 67 %, respectively, relative to the reference model.

scholarly journals Tunnel support design by comparison of empirical and finite element analysis of the Nahakki tunnel in mohmand agency, pakistan

2016 ◽  
Vol 38 (1) ◽  
pp. 75-84
Author(s):  
Asif Riaz ◽  
Syed Muhammad Jamil ◽  
Muhammad Asif ◽  
Kamran Akhtar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rock Mass ◽  
Support Systems ◽  
Classification Systems ◽  
Geological Strength Index ◽  
Support Design ◽  
Element Analysis ◽  
Tunnel Support ◽  
Geological Conditions

Abstract The paper analyses the geological conditions of study area, rock mass strength parameters with suitable support structure propositions for the under construction Nahakki tunnel in Mohmand Agency. Geology of study area varies from mica schist to graphitic marble/phyllite to schist. The tunnel ground is classified and divided by the empisical classification systems like Rock mass rating (RMR), Q system (Q), and Geological strength index (GSI). Tunnel support measures are selected based on RMR and Q classification systems. Computer based finite element analysis (FEM) has given yet another dimension to design approach. FEM software Phase2 version 7.017 is used to calculate and compare deformations and stress concentrations around the tunnel, analyze interaction of support systems with excavated rock masses and verify and check the validity of empirically determined excavation and support systems.

Surrounding Rock Rupture Modeling of Tunnel Based on ANSYS

2014 ◽  
Vol 490-491 ◽  
pp. 863-866
Author(s):  
Bai Cheng Ren
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rock Mass ◽  
Surrounding Rock ◽  
Analysis Software ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Real Condition ◽  
Supporting System ◽  
The Real

This article is based on the real condition of a tunnel. By using displacement and stress contours get from finite element analysis software ANSYS, the simulation of the tunnel excavation is modeled and the regulation of overlying rock’s displacement and stress is deducted during the evacuation of the tunnel. The analysis result to overlying rock mass’ rupture regularity can be helpful for the control of surrounding rock’s stability and the improvement of supporting system. The result shows finite element analysis software ANASYS can be used to guide tunnel constructions during the evacuation.

Experiment Study and Finite Element Analysis of the Failure for 75000 m3 Wet Gasholder

2010 ◽  
Vol 97-101 ◽  
pp. 3332-3335
Author(s):  
Zhi Qiang Li ◽  
Xiao Hu Yao ◽  
Long Mao Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Field Tests ◽  
Finite Element Code ◽  
Experiment Study ◽  
Element Analysis ◽  
Coal Gas ◽  
The People ◽  
Material Component ◽  
Gas Leak

In our city, 75000 m3 Wet Gasholder generated coal gas leak during the work due to the crack of tower wall , which directly endangered life and property security of the people. In the paper, the cause on the failure of gasholder was made much conjecture. Firstly, physicochemical examination and mechanics property on gasholder material component were conducted. Weld conditions between pillar and joist were observed on spot. Secondly, stress of gasholder was analyzed by using finite element code. Thirdly, field tests on the vibration of gasholder were also carried out by means of vibration apparatus. Finally, the principal cause of the failure is determined, and some propose on the maintenance and construction of gasholder is provided.

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