Results 41 to 50 of about 158,678 (171)
National Cave and Karst Research Institute 2009-2010 annual report NCKRI annual report, 2009-2010 [PDF]
, 2011 Contents: Executive Director\u27s Report -- Headquarters Construction -- NCKRI Projects ; Geophysical Investigations ; BLM Cave Assistance Agreement ; Fort Stanton Cave ; Geomicrobiological Research: Lechuguilla Cave ; Naica Cave: Giant Crystals, Tiny ...
National Cave and Karst Research Institute
core
Deep Underground Science and Engineering, EarlyView.To address seepage‐induced tunnel face collapse, this study develops a two‐phase double‐point MPM framework to capture large‐deformation hydro‐mechanical interactions. Incorporating a cementation‐based constitutive model with dynamic permeability updates, the model is successfully validated against saturated granular‐column collapse experiments ...
Yue Tong +6 more
wiley +1 more source
National Cave and Karst Research Institute 2008-2009 annual report NCKRI annual report, 2008-2009 [PDF]
, 2010 Contents: Executive Director\u27s Report -- Headquarters Construction -- NCKRI Projects ; Anthropogenic Sinkholes ; Fort Stanton Cave ; Carbonate Pool Precipitates ; Naica Mine Cave ; Met Pro Corporation ; Desert Varnish ; Imagery Data Extraction ; Karst
National Cave and Karst Research Institute
core
Energy Science &Engineering, EarlyView.This study on close coal seams shows that multi‐seam mining increases the height of the fractured zone from approximately 26 m (single upper‐seam mining) to about 49 m. When the lower seam is mined after the extraction of the upper seam, the heights of both the caved zone and the fractured zone increase by approximately two times.
Xiaoyu Wu +4 more
wiley +1 more source
Moving the National Park Service Cave and Karst Program Forward - Identifying and Understanding Park Resources [PDF]
, 2013 On a national level within the National Park Service (NPS), basic knowledge of cave resources has increased significantly over the last 30 years. With karst resources, while there have been some advances, knowledge of these very complex and hidden ...
National Cave and Karst Research Institute
core
Carsologica Sinica, 2022 Low blocking layers and water-filled caves in high resistivity carbonate rocks are the main target bodies for groundwater exploration in karst areas.
Yanfang Yang +4 more
doaj +1 more source
Journal of Quaternary Science, EarlyView.ABSTRACT The Cadí Massif (42°17′09″ N, 1°38′11″ E; 2649 m a.s.l.) in the southeastern Pyrenees preserves clear evidence of Late Pleistocene glaciation, although previous research has focused almost exclusively on its northern slope. By contrast, the southern slope has remained largely unexplored.
M. Oliva +5 more
wiley +1 more source
Prediction of the Collapse Region Induced by a Concealed Karst Cave above a Deep Highway Tunnel
Advances in Civil Engineering, 2020 The presence of a concealed karst cave above a deep highway tunnel may cause the collapse of the rock mass between the karst cave and tunnel during excavation. Rock mass collapse threatens the safety of tunnel construction personnel.
Fu Huang, Di Wang, Yuan Feng, Min Zhang
doaj +1 more source
Key Technology and Difficult Proble Analysis of Karst Cave Treatment in Power Plant Project
南方能源建设, 2022 [Introduction] The paper aims to sovle the sub-grade problems cause by complex karst and soil cave foundation, design problems in karst and soil cave foundation treatment design, construction problems often occurred in power plant projects, such as ...
ZHOU Leijing, YU Guozhao, LIN Weibin
doaj +1 more source
Southern Portugal hydroclimate of the last millennium from near‐annually resolved speleothem records
Journal of Quaternary Science, EarlyView.ABSTRACT Hydroclimate in Portugal is influenced by the North Atlantic subtropical high‐pressure system (the Azores High) and by internal climate modes, most prominently the North Atlantic Oscillation, which may shift in position and/or intensity due to anthropogenic climate change.
Alaina Chormann +10 more
wiley +1 more source