Results 71 to 80 of about 5,887 (268)

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

Deep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su   +5 more
wiley   +1 more source

Provenance and depositional environment of the Neogene alluvial deposits of the Birjand Plain (South Khorasan) [PDF]

Journal of Stratigraphy and Sedimentology Researches
The study area includes the Neogene alluvial terrace units of Birjand city, which are composed of conglomerate, sandstone and mudstone deposits. Field and petrographicstudies of eight alluvial profile sediments were carried out to investigate the ...
Maryam Mortazavi Mehrizi, Aliyeh Ashrafi
doaj   +1 more source

Data‐driven analysis of the spatial dependence of grouting efficiency during tunnel excavation

Deep Underground Science and Engineering, EarlyView.
Prediction of grouting efficiency using machine learning is enhanced by adopting a training strategy that accounts for the grouting process across multiple rounds. Abstract Grouting with water–cement mixtures is the most widely used and cost‐effective method for managing excess water inflow during tunnel construction.
Huaxin Liu, Xunchang Fei, Wei Wu
wiley   +1 more source

Petrology and geochemistray of Imam-Zadeh Hashem mafic and ultramafic bodies, southern Guilan province

Journal of Economic Geology, 2013
Mafic and ultramafic plutonic igneous bodies, with small and big outcrops, between Shemshak rock units (Jurassic) are observed in east of Imam Zadeh Hashem, in southern Guilan province.
Mojgan Salavati, Reza Fahim Guilani
doaj  

Exhumation history of the Variscan suture: Constrains on the detrital zircon geochronology from Carboniferous–Permian sandstones (Northern Gemericum; Western Carpathians)

Geologica Carpathica, 2019
The Late Paleozoic sedimentary basins in the Northern Gemericum evolved gradually in time and space within the collisional tectonic regime of the Western Carpathian Variscan orogenic belt. The detrital zircon age spectra, obtained from the Mississippian,
Vozárová Anna, Šarinová Katarína, Laurinc Dušan, Lepekhina Elena, Vozár Jozef, Rodionov Nickolay, Lvov Pavel   +6 more
doaj   +1 more source

Tectonic setting, provenance, depositional, and paleo-climatic conditions of the late quaternary subcrop sediments of the southeastern coastal region of the Bengal basin. [PDF]

Heliyon, 2023
Rashid MB, Habib MA, Mahmud A, Ahsan MK, Khasru MH, Hossain MA, Ahsan A, Akther KM, Talukder S.   +8 more
europepmc   +1 more source

Mineral Deposits and Global Tectonic Settings

Eos, Transactions American Geophysical Union, 1984
This book aims to show how ore deposits are related to the concept of plate tectonics; it succeeds. Not too long ago, opaque minerals in a thin section were called “ore” by petrologists and then ignored, and ore deposits were freaks of nature which tended to be where you found them.
openaire   +1 more source

Rockburst prediction based on data preprocessing and hyperband‐RNN‐DNN

Deep Underground Science and Engineering, EarlyView.
A data preprocessing workflow is proposed to address challenges in rockburst data analysis. Coupled algorithms preprocess the data set, and hyperband optimization is used to enhance RNN performance. Results show that preprocessing improves accuracy, while dense layers enhance model stability and prediction performance.
Yong Fan, Chenxi Yin, Guangdong Yang, Shengyong Ding, Bin Tian   +4 more
wiley   +1 more source

Lithospheric Architecture and Mantle Metasomatism Linked to Iron Oxide Cu‐Au Ore Formation: Multidisciplinary Evidence from the Olympic Dam Region, South Australia

Geochemistry, Geophysics, Geosystems, 2018
The role of lithospheric architecture and the mantle in the genesis of iron oxide copper‐gold (IOCG) deposits is controversial. Using the example of the Precambrian Gawler Craton (South Australia), which hosts the giant Olympic Dam IOCG deposit, we ...
R. G. Skirrow, S. E. van derWielen, D. C. Champion, K. Czarnota, S. Thiel   +4 more
doaj   +1 more source

Pyrite Dissolution in the Cretaceous Yogou Formation of the Niger (Chad) Basin: Implications for Basin Evolution under a Rift Tectonic Setting. [PDF]

ACS Omega, 2022
Ahmed KS, Liu K, Fan Y, Kra KL, Harouna M, Liu J, Ntibahanana M, Ntibahanana M, Salim MZ, Pidho JJ, Kouame ME, Moussa HA, Ahmed HA.   +12 more
europepmc   +1 more source