Multistep triaxial strength tests: Investigating strength parameters and pore pressure effects on Opalinus Clay

2011 ◽  
Vol 36 (17-18) ◽  
pp. 1898-1904 ◽  
Author(s):  
W. Gräsle
Keyword(s):  
Pore Pressure ◽  
Pressure Effects ◽  
Opalinus Clay ◽  
Strength Parameters ◽  
Triaxial Strength ◽  
Strength Tests

scholarly journals The impact of the health condition of oaks from the Krotoszyn Plateau on the mechanical properties of timber structures

2015 ◽  
Vol 57 (4) ◽  
pp. 224-232
Author(s):  
Jarosław Siwiński ◽  
Katarzyna Kubiak ◽  
Miłosz Tkaczyk ◽  
Anna Mazur ◽  
Ryszard Rekucki
Keyword(s):  
Mechanical Properties ◽  
Health Condition ◽  
Health State ◽  
Timber Structures ◽  
Strength Parameters ◽  
Modified Method ◽  
Strength Tests ◽  
Prior Selection ◽  
The Impact ◽  
Selection Of

Abstract The study was conducted to perform a comparative analysis of the mechanical properties of wood samples derived from oaks in the Krotoszyn Plateau, which depend on the health state of the trees. Strength parameters of oak wood were calculated for selected diseased and healthy trees (according to the Roloff classification). The study was conducted by a modified method described in the standard Polish Norm PN EN 408+ A1: 2012. For testing, prior selection of wood samples showed that more wood samples of diseased trees compared with those of healthy oaks did not fulfil the Polish standard requirements. According to the method used, the average results of strength tests of timber structures from healthy oaks exhibited higher strength parameters than those of the diseased trees.

scholarly journals Ultrasonic evaluation regarding the effects of biological corrosion of historical roof trusses

2019 ◽  
Vol 284 ◽  
pp. 07006 ◽  
Author(s):  
Wojciech Skowroński ◽  
Bohdan Stawiski
Keyword(s):  
Fibre Length ◽  
Ultrasonic Pulse ◽  
Strength Parameters ◽  
Growth Rings ◽  
Non Invasive ◽  
Testing Method ◽  
Ultrasonic Evaluation ◽  
Annual Growth Rings ◽  
Strength Tests ◽  
Biological Corrosion

For many years work has been performed to obtain sufficiently accurate correlation between the results of ultrasonic tests and the results of strength tests for evaluation of the strength parameters of wood in a structure. It is also important to ensure the development of methods which will facilitate the work of construction mycologists; that is, non-invasive methods of determining the volume of missing materials caused by biological corrosion. The study presents the idea of the objective examination of the thickness of a corroded layer by measuring the velocity of ultrasonic pulse along the fibre length using for this spot heads with thin waveguides. Another testing method presented in the study is controlling the velocity of ultrasonic wave in the direction tangential to annual growth rings by conducting tests on the corner of the corroded beam.

Hydromechanical response of a bedded argillaceous rock formation to excavation and water injection

2015 ◽  
Vol 52 (1) ◽  
pp. 1-17 ◽  
Author(s):  
A.D. Le ◽  
T.S. Nguyen
Keyword(s):  
Rock Mass ◽  
Pore Pressure ◽  
Damage Zone ◽  
Water Injection ◽  
Constitutive Relationship ◽  
Opalinus Clay ◽  
Anisotropic Plastic ◽  
Mont Terri ◽  
Excavation Damage

Opalinus clay is a candidate host formation for the geological disposal of nuclear wastes in Switzerland. The understanding of its long-term mechanical (M) and hydraulic (H) behaviour is an essential requirement for the assessment of its performance as a barrier against radionuclide transport. To study the HM response of Opalinus clay, a microtunnel, 13 m in length and 1 m in diameter, was excavated in that formation at the Mont Terri Underground Research Facility. The rock mass was equipped with sensors to measure the deformation and pore pressure in the rock mass during and after the excavation. A mathematical model that couples the equations of flow and mechanical equilibrium was developed to simulate the HM response of the rock mass. An anisotropic plastic constitutive relationship, based on a microstructure tensor approach, was incorporated in the model. Creep was also considered, as well as the anisotropy of permeability. It is shown that the model satisfactorily predicts the shape and extent of the excavation damage zone (EDZ), deformation, and pore pressure in the rock mass. It is also shown that anisotropy and creep play an important role in the HM response of the rock mass to excavation. The model was further used to simulate water injection tests performed at the test section in the microtunnel. The results show that EDZ, due to its high permeability, is a preferential groundwater flow path along the microtunnel.

Induced AVO anomalies from pore pressure effects

2004 ◽  
Author(s):  
Antonio C. Buginga Ramos ◽  
Marco A. S. Toledo
Keyword(s):  
Pore Pressure ◽  
Pressure Effects

scholarly journals Effect of Modifying Aggregates by Rap and the Simultaneous use of Adhesives for the Stabilization of a Sandy Pavement Subgrade

2021 ◽  
Vol 29 (2) ◽  
pp. 1-8
Author(s):  
Mohammad Mehdi Khabiri ◽  
Bahareh Ebrahimialavijeh
Keyword(s):  
Compressive Strength ◽  
Construction Projects ◽  
Cement Content ◽  
Road Construction ◽  
Environmental Issues ◽  
Dune Sand ◽  
Strength Parameters ◽  
Recycled Asphalt ◽  
Surface Method ◽  
Strength Tests

Abstract The improvement, reconstruction and repair of roads in recent years have increased the content of recycled asphalt in pavements. Using these materials in road construction projects because they reduce the costs, will also be of great help in improving environmental issues. In the present study, dune sand, which can be found in most desert area soil but does not have proper strength and loading capacity for a subgrade, was used. In order to increase the strength parameters of dune sand, various contents of cement and recycled asphalt were examined in California Bearing Ratio (CBR) and compressive strength tests. The results showed that the addition of cement and recycled asphalt can increase compressive strength and bearing capacity and reduce rupture deformations. In a stabilized sample with 27.5% recycled asphalt, increasing the cement from 7.5 to 12.5% increased the compressive strength by 1.045 times, which is the highest amount of change in the samples studied. The maximum CBR and minimum rupture deformations are related to 35% of the recycled asphalt and 12.5% of the cement. The predicted functions of the compressive strength, deformation and CBR depend on two variables of the cement content; the recycled asphalt was then calculated using the response surface method

scholarly journals Study of mechanical parameters of different densities printed structures

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 1072-1074 ◽  
Author(s):  
Jerzy Madej ◽  
Mateusz Śliwka
Keyword(s):  
3D Printing ◽  
Porous Structure ◽  
Numerical Simulations ◽  
Fused Deposition Modeling ◽  
Raw Material ◽  
Mechanical Parameters ◽  
Strength Parameters ◽  
Fused Deposition ◽  
Strength Tests ◽  
Deposition Modeling

Based on the strength tests of porous structure samples printed in FDM technology (fused deposition modeling) from PC/ABS filaments, numerical simulations of bending spring beams for two different filling densities, have been performed. The results of numerical analyzes have been verified experimentally and compared with those obtained with the commercial strength parameters of the raw material used for printing. Conducted and planned studies will allow to develop a methodology for calculating the porous structure created in 3D printing technology.

PORE PRESSURE EFFECTS IN SEISMIC SIMULATION OF AN EARTH DAM

2021 ◽  
Author(s):  
Kemal Edip ◽  
Vlatko Sheshov ◽  
Julijana Bojadjieva ◽  
Toni Kitanovski ◽  
Dejan Ivanovski ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Pressure Effects ◽  
Earth Dam ◽  
Seismic Simulation
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