Understanding cave genesis along favourable bedding planes. The role of the primary rock permeability

2010 ◽  
Vol 54 (2) ◽  
pp. 91-114 ◽  
Author(s):  
Marco Filipponi ◽  
Pierre-Yves Jeannin ◽  
Laurent Tacher
Keyword(s):  
Rock Permeability ◽  
Bedding Planes

scholarly journals A Preliminary Investigation on the Role of Brittle Fracture in the Kinematics of the 2014 San Leo Landslide

Geosciences ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 256 ◽  
Author(s):  
Davide Donati ◽  
Doug Stead ◽  
Davide Elmo ◽  
Lisa Borgatti
Keyword(s):  
Rock Mass ◽  
Laser Scanning ◽  
Preliminary Investigation ◽  
Intact Rock ◽  
Slope Instability ◽  
Numerical Analyses ◽  
Rock Fracturing ◽  
Bedding Planes ◽  
Synthetic Rock

The stability of high rock slopes is largely controlled by the location and orientation of geological features, such as faults, folds, joints, and bedding planes, which can induce structurally controlled slope instability. Under certain conditions, slope kinematics may vary with time, as propagation of existing fractures due to brittle failure may allow development of fully persistent release surfaces. In this paper, the progressive accumulation of brittle damage that occurred prior to and during the 2014 San Leo landslide (northern Italy) is investigated using a synthetic rock mass (SRM) approach. Mapping of brittle fractures, rock bridge failures, and major structures is undertaken using terrestrial laser scanning, photogrammetry, and high-resolution photography. Numerical analyses are conducted to investigate the role of intact rock fracturing on the evolution of kinematic freedom using the two-dimensional Finite-discrete element method (FDEM) code Elfen, and the three-dimensional lattice-spring scheme code Slope Model. Numerical analyses show that the gradual erosion of clay-rich material below the base of the plateau drives the brittle propagation of fractures within the rock mass, until a fully persistent, subvertical rupture surface form, causing toppling of fault-bounded rock columns. This study clearly highlights the potential role of intact rock fracturing on the slope kinematics, and the interaction between intact rock strength, structural geology, and slope morphology.

LANDSLIDES AND THE INCORRECT INTERPRETATION OF GEOLOGICAL STRUCTURE – EXAMPLES FROM THE SUDETY MOUNTAINS

2018 ◽  
Vol 473 (473) ◽  
pp. 27-48
Author(s):  
Aleksander KOWALSKI
Keyword(s):  
Geological Structure ◽  
Geological Mapping ◽  
Structural Elements ◽  
Geomorphological Mapping ◽  
The Past ◽  
Bedding Planes ◽  
Sw Poland ◽  
Geological Units ◽  
Lower Silesia

Despite the relatively large number of individual landslides recognized and described over the last several years from the Sudety (Sudetes) Mountains (Lower Silesia, SW Poland), most of the papers focused on the geomorphological characterisation of these forms. This paper presents the results of geological and geomorphological mapping of individual landslides, recognized within three geological units: the Wleń Graben (Northsudetic Synclinorium), the Łączna Elevation (Intrasudetic Synclinorium) and the Glinno Graben (Sowie Mountains Block). Particular attention has been paid to the role of the geological structure in the initiation and development of mass movements as well as the degree of transformation of the planar, structural elements (bedding planes, joints, faults) of the landslide bedrock. The results of geological mapping and geomorphometric analysis with a basis in Light Detection and Ranging (LiDAR) show that the structural measurements carried out in the past within previously unrecognized landslides were probably the main reason for incorrect interpretations of the geology of the areas investigated.

Role of bedding planes played in enhancing dissolution in sandstones

2022 ◽  
Author(s):  
Jin Lai ◽  
Xiaojiao Pang ◽  
Meng Bao ◽  
Bing Wang ◽  
Jianan Yin ◽  
...  
Keyword(s):  
Bedding Planes

scholarly journals Low-frequency fluid waves in fractures and pipes

Geophysics ◽  
2010 ◽  
Vol 75 (6) ◽  
pp. N97-N107 ◽  
Author(s):  
Valeri Korneev
Keyword(s):  
Guided Waves ◽  
Dominant Role ◽  
Low Frequency ◽  
Fluid Viscosity ◽  
Rock Permeability ◽  
Phase Velocities ◽  
Wave Effects ◽  
Channel Thickness ◽  
Strong Amplitude

Low-frequency analytical solutions have been obtained for phase velocities of symmetrical fluid waves within both an infinite fracture and a pipe filled with a viscous fluid. Three different fluid wave regimes can exist in such objects, depending on the various combinations of parameters, such as fluid density, fluid viscosity, walls shear modulus, channel thickness, and frequency. Equations for velocities of all these regimes have explicit forms and are verified by comparisons with the exact solutions. The dominant role of fractures in rock permeability at field scales and the strong amplitude and frequency effects of Stoneley guided waves suggest the importance of including these wave effects into poroelastic theories.

scholarly journals Estimate of ULF electromagnetic noise caused by a fluid flow during seismic or volcano activity

2014 ◽  
Vol 2 (10) ◽  
pp. 6475-6497
Author(s):  
V. V. Surkov ◽  
V. A. Pilipenko
Keyword(s):  
Electromagnetic Emission ◽  
Theoretical Models ◽  
Pore Channel ◽  
Electromagnetic Noise ◽  
Rock Permeability ◽  
Magma Flow ◽  
Observational Technique ◽  
Water Saturated ◽  
Favorable Conditions

Abstract. The elaboration of theoretical models, even oversimplified, capable to estimate an expected electromagnetic effect during earthquake preparation process is not less important than the advancement of observational technique to detect seismic-related electromagnetic emission. Here possible mechanisms of ULF electromagnetic noise associated with seismic or volcanic activity are discussed. The electrokinetic (EK) and magnetohydrodynamic (MHD) effects due to an irregular flow of conducting rock fluid or magma flow are being revised. The conventional theory of EK effect in a water-saturated rocks has been advanced by consideration of elliptic-shaped channels. A contribution of both mechanisms to observed ULF signal on the ground is shown to be dependent on the pore channel size/rock permeability. Estimates of magnetic and telluric perturbations caused by magma motion along a volcano throat indicate on the important role of the surrounding rock conductivity. These estimates have proven that the mechanisms under consideration are able to generate ULF electromagnetic emission which could be detected by modern magnetometers under favorable conditions.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

Elaborating the role of reflection and individual differences in the study of folk-economic beliefs

2018 ◽  
Vol 41 ◽  
Author(s):  
Kevin Arceneaux
Keyword(s):  
Decision Making ◽  
Individual Differences ◽  
Cognitive Processes ◽  
Evolutionary History ◽  
Behavioral Responses ◽  
History Of ◽  
Economic Beliefs

AbstractIntuitions guide decision-making, and looking to the evolutionary history of humans illuminates why some behavioral responses are more intuitive than others. Yet a place remains for cognitive processes to second-guess intuitive responses – that is, to be reflective – and individual differences abound in automatic, intuitive processing as well.

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