scholarly journals Simulation Analysis of Rainfall Induced Groundwater Flow in Association with Slope Failure

2006 ◽  
Vol 43 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Hiromu MORIWAKI ◽  
Shinobu YAZAKI ◽  
Wenfeng HUANG
Keyword(s):  
Groundwater Flow ◽  
Slope Failure ◽  
Simulation Analysis

scholarly journals Numerical estimation of fracture network permeability based on GEOFRAC model for groundwater modeling in a tin mine

2018 ◽  
Vol 10 (2) ◽  
pp. 243-248
Author(s):  
Lei Lu ◽  
Chunxue Liu ◽  
Gang Chen ◽  
Liang Guo
Keyword(s):  
Groundwater Flow ◽  
Slope Failure ◽  
Groundwater Modeling ◽  
Flow Simulation ◽  
Fracture Network ◽  
Fracture Plane ◽  
Two Dimensional ◽  
Mining Operations ◽  
Sample Data ◽  
Ore Distribution

Abstract Numerous geological research studies and mining operations have proved that fracture is one of the important factors controlling groundwater flow, mineralization, and ore distribution in metallic deposits. Most current approaches to groundwater flow simulation of naturally fractured media rely on the calculation of equivalent permeability tensors from a discrete fracture network (DFN). This study is aimed at developing a rational two-dimensional DFN by GEOFRAC, a geostatistical method of fracture direction and locations of sample data from a tin mine in the Gaosong area, Gejiu city, southwest China, and utilizing 3,724 outcrop fractures sampled on the ground of mountain Gaosong. Principal inputs of the DFN are density, direction, and continuity of disks that constitute a fracture plane. Fractures simulated by GEOFRAC were validated in that their directions corresponded well with those of the sample fractures. The permeability tensor of each modeling grid was then calculated based on the fracture network constructed. The results showed that GEOFRAC is valuable for two-dimensional DFN modeling in mines and other fracture-controlled geological phenomena, such as groundwater flow and slope failure.

Hydrological Environment in Subsurface Steep Slope - Groundwater Flow Passageway on Slope Behind Kiyomizudera -

2011 ◽  
Vol 6 (1) ◽  
pp. 80-87 ◽  
Author(s):  
Junko Nakaya ◽  
◽  
Kazunari Sako ◽  
Shunsuke Mitsutani ◽  
Ryoichi Fukagawa ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Groundwater Flow ◽  
Water Flow ◽  
Slope Failure ◽  
Field Studies ◽  
Steep Slope ◽  
Ground Temperature ◽  
Mountain Slope ◽  
Anomalous Temperature ◽  
Hydrological Environment

The hydrological environment must be understood before water flow can be adequately controlled to prevent slope failure without impacting unduly on the hydrological mountain slope environment. We conducted field studies to determine current sites and measurement of ground temperature 1 meter deep to clarify groundwater flow passageways on the slope behind the cultural heritage temple Kiyomizudera in Kyoto. Results showed anomalous temperature 1 meter deep bands on the slope and several springs that are extensions of these bands. Several of these bands coincide with terrain deformations such as gullies and slope failure scars indicating the probability of relationships between groundwater flow and topological deformation.

scholarly journals Groundwater erosion of coastal gullies along the Canterbury coast (New Zealand): a rapid and episodic process controlled by rainfall intensity and substrate variability

2021 ◽  
Vol 9 (1) ◽  
pp. 1-18
Author(s):  
Aaron Micallef ◽  
Remus Marchis ◽  
Nader Saadatkhah ◽  
Potpreecha Pondthai ◽  
Mark E. Everett ◽  
...  
Keyword(s):  
New Zealand ◽  
Groundwater Flow ◽  
Slope Failure ◽  
Luminescence Dating ◽  
Excess Pore Pressure ◽  
Surface Erosion ◽  
River Channels ◽  
Sandy Gravel ◽  
Groundwater Seepage ◽  
Unconsolidated Sand

Abstract. Gully formation has been associated to groundwater seepage in unconsolidated sand- to gravel-sized sediments. Our understanding of gully evolution by groundwater seepage mostly relies on experiments and numerical simulations, and these rarely take into consideration contrasts in lithology and permeability. In addition, process-based observations and detailed instrumental analyses are rare. As a result, we have a poor understanding of the temporal scale of gully formation by groundwater seepage and the influence of geological heterogeneity on their formation. This is particularly the case for coastal gullies, where the role of groundwater in their formation and evolution has rarely been assessed. We address these knowledge gaps along the Canterbury coast of the South Island (New Zealand) by integrating field observations, luminescence dating, multi-temporal unoccupied aerial vehicle and satellite data, time domain electromagnetic data and slope stability modelling. We show that gully formation is a key process shaping the sandy gravel cliffs of the Canterbury coastline. It is an episodic process associated to groundwater flow that occurs once every 227 d on average, when rainfall intensities exceed 40 mm d−1. The majority of the gullies in a study area southeast (SE) of Ashburton have undergone erosion, predominantly by elongation, during the last 11 years, with the most recent episode occurring 3 years ago. Gullies longer than 200 m are relict features formed by higher groundwater flow and surface erosion > 2 ka ago. Gullies can form at rates of up to 30 m d−1 via two processes, namely the formation of alcoves and tunnels by groundwater seepage, followed by retrogressive slope failure due to undermining and a decrease in shear strength driven by excess pore pressure development. The location of gullies is determined by the occurrence of hydraulically conductive zones, such as relict braided river channels and possibly tunnels, and of sand lenses exposed across sandy gravel cliffs. We also show that the gully planform shape is generally geometrically similar at consecutive stages of evolution. These outcomes will facilitate the reconstruction and prediction of a prevalent erosive process and overlooked geohazard along the Canterbury coastline.

Simulation Analysis of Slope Stability Based on Strength Reduction

2011 ◽  
Vol 396-398 ◽  
pp. 2213-2216
Author(s):  
Dong Ming Zhang ◽  
Hong Fu He ◽  
Jiang Chen ◽  
Yan Zeng Wang
Keyword(s):  
Plastic Strain ◽  
Slope Failure ◽  
Simulation Analysis ◽  
Slip Surface ◽  
Horizontal Displacement ◽  
Strength Reduction ◽  
Finite Element Software ◽  
Shear Strength Reduction Method ◽  
Calculation Results ◽  
Rock Landslide

The characteristic of the stress and strain distribution of rock landslide are simulated by ANSYS finite element software, while its variation and distribution of plastic zone are analyzed by shear strength reduction method at the same time, which are used to search out the most dangerous slip surface. Calculation results show that: (1)Geotechnical landslide along the interface has decline; the stress increases by the depth of the slope and presents the layered distribution in the X, Y directions. (2)According to the contours of the plastic strain, the plastic strain contour ridge is the most dangerous slip surface. (3)Safety coefficients are offered by calculating the non-convergence, the maximum horizontal displacement and horizontal displacement of feature point mutation in slope failure criterion, to provide the basis for the landslide hazard warning.

Instability caused by a seepage impediment in layered fill slopes

2008 ◽  
Vol 45 (10) ◽  
pp. 1410-1425 ◽  
Author(s):  
Y. S. Lee ◽  
C. Y. Cheuk ◽  
M. D. Bolton
Keyword(s):  
Hydraulic Conductivity ◽  
Groundwater Flow ◽  
Slope Failure ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Friction Angle ◽  
Excess Pore Pressure ◽  
Order Of Magnitude ◽  
Numerical Parametric Study ◽  
Fill Slope

The underlying cause of loose fill slope failures in Hong Kong has been attributed to static liquefaction during heavy rainfall. A series of centrifuge model tests and numerical analyses were conducted to illustrate that instability of a fill slope inclined at approximately the internal friction angle of the soil can be triggered by confined groundwater flow due to soil layering in the fill slope. The results also showed that slope failure could occur irrespective of the density of the fill material when seepage was sufficiently impeded leading to a localised buildup of pore-water pressure in the slope. A numerical parametric study was carried out to examine the effect of variations in hydraulic conductivity in the layered fill slopes. The results showed that the excess pore pressure distribution and hence the failure mode were strongly dependent on the location of the inhomogeneous soil layers and their hydraulic properties. It was also demonstrated that layered fill slopes with spatial variation in hydraulic conductivity of as small as one order of magnitude were vulnerable to global failure under confined groundwater flow.

Simulation analysis on three-dimensional slope failure under different conditions

2011 ◽  
Vol 21 (11) ◽  
pp. 2490-2502 ◽  
Author(s):  
Ke ZHANG ◽  
Ping CAO ◽  
Zi-yao LIU ◽  
Hui-hua HU ◽  
Dao-ping GONG
Keyword(s):  
Slope Failure ◽  
Simulation Analysis ◽  
Three Dimensional
Sign in / Sign up

Export Citation Format

Share Document