scholarly journals Geotechnical Aspects of Weak Sandstone from Recife/Brazil

2018 ◽  
Vol 41 (1) ◽  
pp. 061-074
Author(s):  
Orlando Martini de Oliveira ◽  
Rodrigo Bim ◽  
Gabriel Bellina Nunes ◽  
Rafael Augusto dos Reis Higashi
Keyword(s):  
Weak Sandstone

DEM Study of Wave Propagation in Weak Sandstone

2002 ◽  
Author(s):  
Jon Olson ◽  
R. Narayanasamy ◽  
Jon Holder ◽  
Alan Rauch ◽  
B. Comacho
Keyword(s):  
Wave Propagation ◽  
Weak Sandstone

Experimental and Numerical Characterization of the Stress-Strain Behavior of Weak Sandstone Formations for Sanding Assessment

2018 ◽  
Author(s):  
Nubia Aurora González Molano ◽  
Jacobo Canal Vila ◽  
Héctor González Pérez ◽  
José Alvarellos Iglesias ◽  
M. R. Lakshmikantha
Keyword(s):  
Constitutive Model ◽  
Equivalent Plastic Strain ◽  
Experimental Tests ◽  
Thick Wall ◽  
Triaxial Tests ◽  
Experimental Program ◽  
Model Parameters ◽  
Sand Production ◽  
Strain Behavior ◽  
Weak Sandstone

In this study an extensive experimental program has been carried out in order to characterize the mechanical behavior of two weak sandstone formations of an offshore field for application to sand production modeling. The experimental tests included Scratch tests, Triaxial tests and Advanced thick wall cylinder tests (ATWC) where the sand production initiation and the cumulative sand produced were registered. Numerical simulations of experimental tests were then performed using an advanced elasto-plastic constitutive model. Triaxial tests simulations allowed calibrating the constitutive model parameters. These parameters were employed for the numerical simulation of the ATWC in order to determine the equivalent plastic strain threshold required to the onset of sand production observed in laboratory for sanding assessment. Results obtained highlight the importance to use a realistic representation of the rock behavior focusing on post-yield behavior in order to build confidence in model predictions.

Experimental Research on Rheological Property of Water-Bearing Weak Sandstone in Large Cross-Section Tunnelling

2012 ◽  
Vol 256-259 ◽  
pp. 1402-1405 ◽  
Author(s):  
Ye Zhou ◽  
Peng Fei Li
Keyword(s):  
Water Content ◽  
Cross Section ◽  
Rheological Characteristic ◽  
Test Results ◽  
Large Cross Section ◽  
Rheological Equation ◽  
Tunnel Face ◽  
Water Bursting ◽  
The Relationship ◽  
Weak Sandstone

Various problems such as sand, mud and water bursting, unstability of tunnel face, large deformation of surrounding rock and severe cracking of primary support occurred in excavation of the water-bearing weak sandstone strata of Huma Ling Tunnel, Lan-Yu railway. Based on the uniaxial compressive strength tests and uniaxial compressive rheological tests on weak sandstone with water content of 0, 2%, 5%, 8% and 12%, the relationship between rheological characteristic and water content of water-bearing weak sandstone is obtained. According to results of tests, factors and water contents are fitted by applying generalized rheological equation of Kelvin. And the rheological equation of water-bearing weak sandstone with various water content is deduced. The test results and conclusion can offer reference for analyzing deformation characteristics and instability mechanism of water-bearing weak sandstone in large cross-section tunnelling.

Testing of rock climbing anchors in weak sandstone

2014 ◽  
Vol 18 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Michael Law ◽  
Steve Hawkshaw
Keyword(s):  
Rock Climbing ◽  
Weak Sandstone
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