Results 41 to 50 of about 208,400 (295)

Circular Kinks on the Surface of Granular Material Rotated in a Tilted Spinning Bucket

, 1999
We find that circular kinks form on the surface of granular material when the axis of rotation is tilted more than the angle of internal friction of the material.
A. Medina, A. Mehta, A. Mehta, Byeong-ho Eom, C. S. Campbell, C. Yeung, H. Hayagawa, H. M. Jaeger, Insuk Yu, J.-P. Bouchaud, Jysoo Lee, M. E. Vavrek, P. Bak, P. Bak, R. Jackson, Sangsoo Yoon   +15 more
core   +1 more source

Active State Earth Pressure based on Dubrova’s Method of Redistribution of Pressure

Electronic Journal of Structural Engineering, 2018
Modes and magnitude of wall movement have great influence on the distribution of earth pressure behind retaining wall. For gravity retaining wall exerted by cohesionless soil rotating outward about the base, based on Dubrova’s method of redistribution ...
S.C. Wang, F. Xu, Y. Shao
doaj   +1 more source

Effect of moisture on mechanical behavior of granular material in initial laboratory and mechanical tests [PDF]

, 2018
In this article authors present results of initial laboratory tests and further numerical analyses using finite element method (FEM) and back - calculation method.
Grygierek, Marcin, Rokitowski, Przemyslaw   +1 more
core   +1 more source

Centrifugal Test and Instability Model Analysis of Excavation Surface Stability of a Shield Tunnel in a Clay Layer

Frontiers in Earth Science, 2022
In order to study the variation law of support pressure and instability mode of excavation face under different soil parameters, a complete set of centrifugal model seepage test device is independently developed.
Haoshuang Niu, Xiaolin Weng, Jibo Hu, Lele Hou   +3 more
doaj   +1 more source

Calculating the cohesion and internal friction angle of volcanic rocks and rock masses

Volcanica, 2021
Rock failure criteria are key input parameters for models designed to better understand the stability of volcanic rock masses. Cohesion and friction angle are the two defining material variables for the Mohr-Coulomb failure criterion. Although these can be determined from laboratory deformation experiments, they are rarely reported.
Villeneuve, Marlène, Heap, Michael
openaire   +4 more sources

Shear-Compression Failure Condition of Key Strata Under Elastic Support During Periodic Breakage

Applied Sciences
The shear-compression failure of key strata leads to stair-step collapse and severe mine pressure, posing significant safety risks in coal mines. Existing theories fail to account for the boundary conditions and breaking sizes of key strata, making ...
Hongjie Liu, Mingxian Peng, Yang Tai, Jun Ding   +3 more
doaj   +1 more source

Experimental Study on the Effects of Initial Shear Stress and Vibration Frequency on Dynamic Strength of Saturated Sands

Advances in Materials Science and Engineering, 2019
The cyclic triaxial system is used to investigate the effects of confining pressure, initial shear stress, cyclic stress ratio, and vibration frequency on the dynamic strength characteristics of saturated sand in the Wenchuan area. Results show that when
Jian Zhang, Jiuting Cao, Sijie Huang
doaj   +1 more source

Physical characterization of coffee after roasting and grinding

Semina: Ciências Agrárias, 2014
Flowability is an important characteristic of handling process for efficiency and reliability purpose of post-harvest operations, which are governed by the physical properties of the product.
Gabriel Henrique Horta de Oliveira , Paulo Cesar Corrêa , Fábio Lúcio Santos , Wander Luiz Vasconcelos o Santos , Carlito Calil Júnior , Fernanda Machado Baptestini , Guillermo Asdrúbal Vargas-Elías   +6 more
doaj   +1 more source

Thermal noise in interferometric gravitational wave detectors due to dielectric optical coatings

, 2001
We report on thermal noise from the internal friction of dielectric coatings made from alternating layers of Ta2O5 and SiO2 deposited on fused silica substrates.
, , Abramovici A, Andri M Gretarsson, Blevins R D, Braginsky V B, Cadez A, Crooks D, D R M Crooks, Fraser D B, Fraser D B, Fritschel P, Gianpietro Cagnoli, Gregory M Harry, Gretarsson A M, Gwo D H, Jim Hough, Jones R M, Libbrecht K, Lunin B S, Lück H, Martin M Fejer, Nakagawa N, Nakagawa N, Norio Nakagawa, Peter R Saulson, Rowan S, Scott E Kittelberger, Sheila Rowan, Steven D Penn, Tsubono K, Whitcomb S, Willems P, William J Startin   +33 more
core   +1 more source

Modeling mountain building and the seismic cycle in the Himalaya of Nepal [PDF]

, 2000
A host of information is now available regarding the geological and thermal structure as well as deformation rate across the Himalaya of central Nepal.
Avouac, J. P., Cattin, R.
core   +1 more source