Numerical Analysis for the Evaluation of Pull-Out Capacity of Helical Anchors in Sand

2019 ◽  
pp. 207-218
Author(s):  
Akhil Pandey ◽  
Vinay Bhushan Chauhan
Keyword(s):  
Numerical Analysis ◽  
Pull Out

scholarly journals Interaction between an Eco-Spiral Bolt and Crushed Rock in a Borehole Evaluated by Pull-Out Testing

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Seong-Seung Kang ◽  
Atsuo Hirata ◽  
Bo-An Jang ◽  
Yong-Seok Seo ◽  
Daehyeon Kim
Keyword(s):  
Numerical Analysis ◽  
Inverse Relationship ◽  
Maximum Principal Stress ◽  
Crushed Rock ◽  
Size Difference ◽  
Resistance Force ◽  
High Porosity ◽  
Residual Resistance ◽  
Pull Out ◽  
Axial Resistance

The interactions between an eco-spiral bolt and crushed rocks in a borehole were evaluated by pull-out testing in a laboratory and numerical analysis. The porosity of the crushed rock surrounding the bolt depended on the size of the eco-spiral bolt and affected the eco-spiral bolt’s axial resistance force. The axial resistance force and the porosity of the crushed rocks in the borehole showed an inverse relationship. The porosity was also related to the size of the eco-spiral bolt. The maximum principal stress between the bolt and the rock was related to the porosity of the crushed rock and the size difference between the eco-spiral bolt and the borehole. At low porosity the experimental and numerical analyses show similar relationships between the axial resistance force and the displacement. However, at high porosity, the numerical results deviated greatly from the experimental observation. The initial agreement is attributed to the state of residual resistance after the maximum axial resistance force, and the latter divergence was due to the decreasing axial resistance force owing to slippage.

Experimental and Numerical Analysis on the Bonding Performance of GFRP Bolts

2015 ◽  
Vol 777 ◽  
pp. 166-172
Author(s):  
Ya Chuan Kuang ◽  
Lian Wen Ou ◽  
Jin Xing Hu
Keyword(s):  
Numerical Analysis ◽  
Friction Angle ◽  
Surface Shape ◽  
Anchorage Length ◽  
Rock Stability ◽  
Bonding Performance ◽  
Ansys Analysis ◽  
Pull Out ◽  
Peak Shear Stress ◽  
Bolt Diameter

By pull-out tests between GFRP bolts and concrete, the influence of the diameter and surface shape of GFRP bolts on the bonding performance was studied. By ANSYS analysis, the effects of anchorage length, diameter, geotechnical parameters and prestress on the bonding performance were studied. The experimental and numerical analysis results show that: with the increase of bolt diameter, the bonding strength of bolts decrease and the slippages increase. The bigger the parameters of rock-soil like modulus of elasticity, cohesion strength and internal friction angle are, the better is the bond behavior and the smaller is the slippage. The prestress plays an important role in the rock stability and the restriction of deformation. With the enhancement of the prestress of bolts, the peak shear stress increases but the effective anchorage length nearly stays the same.

Experimental and numerical analysis pull-out strength of steel strip in foam concrete

2013 ◽  
Vol 17 (10) ◽  
pp. 982-1001 ◽  
Author(s):  
Maziar Ramezani ◽  
Juan Vilches ◽  
Thomas Neitzert
Keyword(s):  
Numerical Analysis ◽  
Steel Strip ◽  
Foam Concrete ◽  
Pull Out ◽  
Pull Out Strength

Experimental and numerical analysis of in situ pull-out tests on rock bolts in claystones

2019 ◽  
pp. 1-24
Author(s):  
Richard Giot ◽  
Christophe Auvray ◽  
Simon Raude ◽  
Albert Giraud
Keyword(s):  
Numerical Analysis ◽  
Rock Bolts ◽  
Pull Out

scholarly journals Numerical analysis of crack propagation in a pull-out test

2019 ◽  
Vol 252 ◽  
pp. 08001 ◽  
Author(s):  
Jakub Gontarz ◽  
Jerzy Podgórski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Crack Propagation ◽  
Computer Program ◽  
Laboratory Tests ◽  
Rock Fragment ◽  
The Finite Element Method ◽  
Pull Out ◽  
Propagation Methods

This paper describes the computer analysis of the pull-out test for determining the force needed to pull out a rock fragment, and the shape of this fractured fragment. The material analysed is sandstone. The analysis included a comparison of the various crack propagation methods in computer program using the Finite Element Method. The work also contains a description of performed laboratory tests and analytical considerations.

scholarly journals Numerical analysis of undercut anchor effect on rock

2021 ◽  
Vol 2130 (1) ◽  
pp. 012011
Author(s):  
J Jonak ◽  
R Karpiński ◽  
A Wójcik
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Mass ◽  
Numerical Analysis ◽  
Coulomb Friction ◽  
Rock Surface ◽  
Failure Zone ◽  
Anchor Effect ◽  
The Finite Element Method ◽  
Pull Out

Abstract The paper presents the results of a numerical analysis using the Finite Element Method (FEM) of the friction issue in the contact between the undercut anchor head and rock during anchor pull-out. Formation of failure zone of rock medium was analysed assuming different Coulomb friction coefficients in the contact zone of conical anchor head with a rock. The problem is interesting as regards practical aspects of rock mass loosening during anchor pull-out. The analysis revealed a significant effect of the friction coefficient on the propagation and extent of the failure zone. Increasing the friction factor significantly decreases the extent of the failure zone measured on a free rock surface.

scholarly journals Evaluation of Stress Transfer Mechanism in Single Fiber Pull-Out Test by Numerical Analysis.

1998 ◽  
Vol 47 (6) ◽  
pp. 612-617
Author(s):  
Kazuaki NISHIYABU ◽  
Atsushi YOKOYAMA ◽  
Masaru ZAKO
Keyword(s):  
Numerical Analysis ◽  
Stress Transfer ◽  
Transfer Mechanism ◽  
Single Fiber ◽  
Pull Out

scholarly journals Evaluation of the Pullout Behavior of Pre-Bored Piles Embedded in Rock

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5593
Author(s):  
Kyungho Park ◽  
Daehyeon Kim ◽  
Gyudeok Kim ◽  
Wooyoul Lee
Keyword(s):  
Numerical Analysis ◽  
Skin Friction ◽  
Adhesion Strength ◽  
Adhesion Force ◽  
Load Test ◽  
Drilled Shaft ◽  
Allowable Limit ◽  
Dry Process ◽  
Bored Pile ◽  
Pull Out

The subject of this study is dry process caisson tube method cofferdam (hereinafter called C.T cofferdam). This C.T cofferdam is designed to use the skin friction of the drilled shaft embedded into the rock for stability of buoyancy. A pre-bored pile embedded in the bedrock was pulled out due to the buoyancy of the C.T cofferdam at the pier (hereinafter called P) 2 of the OO bridges under construction, to which this was applied. In this study, in order to solve this problem, the adhesion force applied with the concept of skin friction and the pre-bored pile of drilled shaft according to domestic and foreign design standards were identified; the on-site pull-out load test was used to calculate the pull-out force; and the skin friction of the drilled shaft and pre-bored pile embedded into the bedrock were compared and analyzed. In addition, the pull-out behavior of the pre-bored pile embedded in the bedrock was analyzed through numerical analysis. The adhesion strength tested in the lab was 881 kN for air curing of concrete and 542 kN for water curing of concrete, and the on-site pull-out test result was 399.7 kN. As a result of the numerical analysis, the material properties of the grout considering the site conditions used revealed that the displacement of the entire structure exceeded the allowable limit and was unstable. This appears to have lowered the adhesion strength due to construction issues such as ground complexity and both seawater and slime treatment, which were not expected at the time of design.

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