Results 261 to 270 of about 4,297,894 (335)

The mechanical contrast between layers controls fracture containment in layered rocks

Journal of Structural Geology, 2019
Abstract Open natural fractures allow fluids to flow, which is necessary for the production of low-permeable geothermal and petroleum reservoirs. These reservoirs often consist of lithological layers with significant variation in rock strength, which makes it difficult to predict fracture containment within the rock succession.
Lisanne A.N.R. Douma, Jaap A. Regelink, Giovanni Bertotti, Quinten D. Boersma, Auke Barnhoorn   +4 more
openaire   +1 more source

Patterns to ores in layered rocks

Economic Geology, 1961
Takes exception to a recently published interpretation of the Basal Reef in the Orange Free State gold field (South Africa) as a stream deposit, pointing out that these and adjacent beds of the upper Witwatersrand sequence are all of blanket type and exhibit features characteristic of the basal conglomerates of a transgressing sea.
openaire   +1 more source

Significance of Layer-Parallel Slip During Folding of Layered Sedimentary Rocks

Geological Society of America Bulletin, 1974
The Greenport Center syncline is an asymmetric fold with a half wave length of about 40 m developed in the Devonian Becraft and Alsen Limestones on Becraft Mountain, New York. Twinning strains have been measured in 19 samples distributed so as to sample all of the structurally significant regions of the fold.
WILLIAM M. CHAPPLE, JOHN H. SPANG
openaire   +1 more source

Glacial Erosion in Tilted Rock Layers

The Journal of Geology, 1955
Isle Royale in Lake Superior and the Rove area of northeastern Minnesota have valley and ridge topographies controlled by bands of massive, poorly jointed rock, alternating with highly jointed rock units. The ridges are asymmetrical in cross section, with gentle dip slopes on one side and precipitous antidip slopes on the other.
openaire   +1 more source

Strain localization mechanisms in deep-seated layered rocks

Geologische Rundschau, 1997
More than 160 shear zones of the Norwegian Caledonides and Italian Southern Alps, formed under high-temperature or high-pressure conditions, are analysed with respect to mechanisms of strain localization. In metabasic rocks with a pre-existing (magmatic) layering strain localizes preferentially in mafic layers, although experiments in monomineralic ...
openaire   +2 more sources

Model test study on sliding-toppling composite deformation evolution of anti-dip layered rock slope

Bulletin of Engineering Geology and the Environment, 2023
Yifei Gong, A. Yao, Yanlin Li, Yanyan Li, Yanan Li, Yingtao Sun   +5 more
semanticscholar   +1 more source

A Novel Mixed-Mode Power Exponent Cohesive Zone Model for FDEM and Its Application to Tunnel Excavation in the Layered Rock Mass

Rock Mechanics and Rock Engineering, 2023
Ping Liu, Quansheng Liu, Penghai Deng, Yin Bo, Xianqi Xie   +4 more
semanticscholar   +1 more source

Anisotropic behavior of excavated layered rock mass subjected to compression considering the joint roughness

Bulletin of Engineering Geology and the Environment, 2023
Pei-tao Wang, Chi Ma, Cao Liu, Qingru Liu, Yilin Fu, Meifeng Cai   +5 more
semanticscholar   +1 more source

Strength and Failure Mode of Expansive Slurry-Inclined Layered Rock Mass Composite Based on Mohr–Coulomb Criterion

Rock Mechanics and Rock Engineering, 2023
N. Yao, X. Deng, Binyu Luo, Felix Oppong, Pengcheng Li   +4 more
semanticscholar   +1 more source

An improved smooth particle hydrodynamics method for modelling crack propagation in layered rock cells and slopes

Bulletin of Engineering Geology and the Environment, 2023
Chengzhi Xia, Zhen-Hao Shi, Hongchao Zheng   +2 more
semanticscholar   +1 more source