Responses of chemically active and naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure          下载免费PDF全文

Chao Liu  Son K. Hoang  Younane N. Abousleiman 《国际地质力学数值与分析法杂志》2018,42(1):34-69

In this paper, the analytical dual‐porosity dual‐permeability poromechanics solution for saturated cylinders is extended to account for electrokinetic effects and material transverse isotropy, which simulate the responses of chemically active naturally fractured shale under time‐dependent mechanical loading and ionic solution exposure. The solution addresses the stresses, fracture pore pressure, matrix pore pressure, fluid fluxes, ion concentration evolution, and displacements due to the applied stress, pore pressure, and solute concentration difference between the sample and the circulation fluid. The presented solution will not only help validate numerical simulations but also assist in calibrating and interpreting laboratory results on dual‐porosity dual‐permeability shale. It is recommended that the analytical solutions of radial and axial displacements be used to match the corresponding laboratory‐recorded data to determine shale dual permeability and chemo‐electrical parameters including membrane coefficient, ions diffusion coefficients, and electro‐osmotic permeability.  相似文献   

Interdecadal change in typhoon genesis condition over the western North Pacific     

Yumi Choi  Kyung-Ja Ha  Chang-Hoi Ho  Chul Eddy Chung 《Climate Dynamics》2015,45(11-12):3243-3255

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Changes in heat wave characteristics over Extremadura (SW Spain)     

Acero  Francisco Javier  Fernández-Fernández  María Isabel  Carrasco  Víctor Manuel Sánchez  Parey  Sylvie  Hoang  Thi Thu Huong  Dacunha-Castelle  Didier  García  José Agustín 《Theoretical and Applied Climatology》2018,133(1-2):605-617

Theoretical and Applied Climatology - Heat wave (HW) events are becoming more frequent, and they have important consequences because of the negative effects they can have not only on the human...  相似文献   

Comparison between cyclic and dynamic rocking behavior for embedded shallow foundation using centrifuge tests     

Kil-Wan Ko  Jeong-Gon Ha  Heon-Joon Park  Dong-Soo Kim 《Bulletin of Earthquake Engineering》2018,16(11):5171-5193

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The Kellwasser events in the Upper Devonian Frasnian to Famennian transition in the Toc Tat Formation,northern Vietnam     

Toshifumi Komatsu  Ryota Urakawa  Toshitaka Inada  Kazuki Yamauchi  Takumi Maekawa  Reishi Takashima  Mark Williams  Phong D. Nguyen  Hung D. Doan  Minh T. Nguyen  Shuji Niko  Gengo Tanaka  Tatsuhiko Yamaguchi 《Island Arc》2019,28(1)

Upper Devonian carbonates of the Toc Tat Formation in the Si Phai Pass area of Dong Van District, northern Vietnam were deposited in carbonate platform, slope, and basin environments. These carbonates yield abundant conodonts indicative of the Palmatolepis nasuta, Pa. linguiformis and Pa. triangularis zones, the Frasnian–Famennian stage boundary being identified by the first occurrence of Pa. triangularis. Two positive carbon isotope excursions are recognized, the lower excursion peaking in the interval of the lower to middle Pa. nasuta Zone, whilst the upper excursion peaks just above the local Frasnian–Famennian boundary. Based on the biostratigraphy, these excursions equate to the Lower and Upper Kellwasser events. Locally, tentaculitoid taxa (Nowakia, Styliolina, Homoctenus, and Metastyliolina?) are abundant in the interval of the Pa. nasuta Zone, but show a drastic decline in abundance before the Lower Kellwasser Event, and only two taxa survived into the Famennian.  相似文献   

Features in REE and Methane Anomalies Distribution in the East China Sea Water Column: a Comparison with the South China Sea     

Le Duc Luong  Shakirov  Renat B.  Hoang  Nguyen  Shinjo  Ryuichi  Obzhirov  Anatoly  Syrbu  Nadezhda  Shakirova  Maria 《Water Resources》2019,46(5):807-816

Water Resources - This paper presents review of dissolved Rare Earth Elements (REE) and methane anomalies distribution in the East China Sea water column. In general, the REE concentrations of the...  相似文献   

A comparative study of sequential minimal optimization-based support vector machines,vote feature intervals,and logistic regression in landslide susceptibility assessment using GIS     

Binh Thai Pham  Dieu Tien Bui  Indra Prakash  Long Hoang Nguyen  M. B. Dholakia 《Environmental Earth Sciences》2017,76(10):371

Landslide susceptibility assessment using GIS has been done for part of Uttarakhand region of Himalaya (India) with the objective of comparing the predictive capability of three different machine learning methods, namely sequential minimal optimization-based support vector machines (SMOSVM), vote feature intervals (VFI), and logistic regression (LR) for spatial prediction of landslide occurrence. Out of these three methods, the SMOSVM and VFI are state-of-the-art methods for binary classification problems but have not been applied for landslide prediction, whereas the LR is known as a popular method for landslide susceptibility assessment. In the study, a total of 430 historical landslide polygons and 11 landslide affecting factors such as slope angle, slope aspect, elevation, curvature, lithology, soil, land cover, distance to roads, distance to rivers, distance to lineaments, and rainfall were selected for landslide analysis. For validation and comparison, statistical index-based methods and the receiver operating characteristic curve have been used. Analysis results show that all these models have good performance for landslide spatial prediction but the SMOSVM model has the highest predictive capability, followed by the VFI model, and the LR model, respectively. Thus, SMOSVM is a better model for landslide prediction and can be used for landslide susceptibility mapping of landslide-prone areas.  相似文献   

Laplace–Fourier-Domain Full Waveform Inversion of Deep-Sea Seismic Data Acquired with Limited Offsets     

Yongchae Cho  Wansoo Ha  Youngseo Kim  Changsoo Shin  Satish Singh  Eunjin Park 《Pure and Applied Geophysics》2016,173(3):749-773

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Acoustic full waveform inversion of synthetic land and marine data in the Laplace domain     

Wansoo Ha  Sukjoon Pyun  Jewoo Yoo  Changsoo Shin 《Geophysical Prospecting》2010,58(6):1033-1048

Elastic waves, such as Rayleigh and mode‐converted waves, together with amplitude versus offset variations, serve as noise in full waveform inversion using the acoustic approximation. Heavy preprocessing must be applied to remove elastic effects to invert land or marine data using the acoustic inversion method in the time or frequency domains. Full waveform inversion using the elastic wave equation should be one alternative; however, multi‐parameter inversion is expensive and sensitive to the starting velocity model. We implement full acoustic waveform inversion of synthetic land and marine data in the Laplace domain with minimum preprocessing (i.e., muting) to remove elastic effects. The damping in the Laplace transform can be thought of as an automatic time windowing. Numerical examples show that Laplace‐domain acoustic inversion can yield correct smooth velocity models even with the noise originating from elastic waves. This offers the opportunity to develop an accurate smooth starting model for subsequent inversion in the frequency domain.  相似文献   

EM and GPR investigations of contaminant spread around the Hoc Mon waste site,Vietnam     

Nguyen van Giang  Guy Marquis  Le Huy Minh 《Acta Geophysica》2010,58(6):1040-1055

This paper is presenting the results from near-surface geophysical surveys near the waste site of Hoc Mon in southern Vietnam where leachate contamination has been recognized at the surface. Using EM and GPR surveys, we were able to determine the lateral extent of a contaminated area of high electrical conductivity and have identified channels that concentrate the contaminant flow. The simple relationship between the electrical resistivity and the leachate concentration is suggested and estimated the in situ leachate concentration from the inversion of the EM data; values are as high as 40%. Thanks to a permeability barrier leachate flow is confined to the shallow subsurface, making it easier to apply possible site remediation projects.  相似文献