Preliminary Express Assessment of Dispersive Soil Foundations Using MASW

2021 ◽  
pp. 55-63
Author(s):  
Vadim Antipov ◽  
Vadim Ofrikhter
Keyword(s):  
Dispersive Soil

Discussion of “Dispersive Soil Problem at Los Esteros Dam”

1980 ◽  
Vol 106 (11) ◽  
pp. 1282-1283
Author(s):  
Andrew L. Melvill
Keyword(s):  
Dispersive Soil

scholarly journals Effect of Dispersive Soil on the Electromagnetic Response of Buried Wires in the UHF Range

Radio Science ◽  
2018 ◽  
Vol 53 (7) ◽  
pp. 895-905 ◽  
Author(s):  
John J. Pantoja ◽  
Felix Vega ◽  
Francisco Román ◽  
Farhad Rachidi
Keyword(s):  
Electromagnetic Response ◽  
Dispersive Soil

Estimating the Strength of Stabilized Dispersive Soil with Cement Clinker and Fly Ash

2019 ◽  
Vol 37 (4) ◽  
pp. 2915-2926 ◽  
Author(s):  
Samaptika Mohanty ◽  
Nagendra Roy ◽  
Suresh Prasad Singh ◽  
Parveen Sihag
Keyword(s):  
Fly Ash ◽  
Cement Clinker ◽  
Dispersive Soil

3-D simulation of GPR surveys over pipes in dispersive soils

Geophysics ◽  
2000 ◽  
Vol 65 (5) ◽  
pp. 1560-1568 ◽  
Author(s):  
Tsili Wang ◽  
Michael L. Oristaglio
Keyword(s):  
Electrical Properties ◽  
Time Domain ◽  
Maxwell’S Equations ◽  
Maxwell's Equations ◽  
Displacement Vector ◽  
Electric Displacement ◽  
Field Vector ◽  
Dispersive Media ◽  
Dispersive Soils ◽  
Dispersive Soil

The finite‐difference time‐domain method is adapted to simulate radar surveys of objects buried in dispersive soils whose complex permittivity depends on frequency. The method treats dispersion through the constitutive relation between the electric field vector and the electric displacement vector, which is a convolution in the time domain. This convolution is updated recursively, along with Maxwell’s equations, after approximating the dispersion with a Debye (exponential) relaxation model. A novel feature of our work is the inclusion of dispersion in the perfectly‐matched layer formulation of Maxwell’s equations, which gives an absorbing boundary condition for dispersive media. We simulate 200-MHz ground‐penetrating radar surveys over metallic and plastic pipes buried at a depth of 2 m in soils whose electrical properties model are those of clay loams of different moisture contents. Radar reflections modeled for pipes in dispersive soil differ from those for pipes in soils whose electrical properties are constant (at the values of dispersive soil at the central frequency of the radar pulse). Because the permittivity decreases at higher frequencies in the soils modeled, energy in the reflections shifts toward the front of the waveform, and the amplitudes of trailing lobes in the waveform are suppressed. The effects are subtle, but become more pronounced in models of soils with 10% moisture content by weight.

Computation of Lightning-Induced Voltages Considering Ground Impedance of Multi-Conductor Line for Lossy Dispersive Soil

2021 ◽  
pp. 1-1
Author(s):  
Mohammad Elsaeed Mohammad Rizk ◽  
Sayed Mohamed Abulanwar ◽  
Abdelhady Tolba Mohamed Ghanem ◽  
Matti Lehtonen
Keyword(s):  
Conductor Line ◽  
Dispersive Soil

scholarly journals Landslide Failure Mechanisms of Dispersive Soil Slopes in Seasonally Frozen Regions

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Lixiang Wang ◽  
Xiaoming Yuan ◽  
Miao Wang
Keyword(s):  
Soil Structure ◽  
Theoretical Calculations ◽  
Substantial Reduction ◽  
Soil Mass ◽  
Soil Slope ◽  
Soil Layers ◽  
Landslide Occurrence ◽  
Soil Instability ◽  
Seasonally Frozen Regions ◽  
Dispersive Soil

Hydraulic projects with dispersive soil in seasonally frozen regions are susceptible to landslide failures. The mechanism of such landslide failures has not been fully understood thus far; therefore, it was investigated in this study by using on-site surveys, laboratory tests, and theoretical calculations. The results showed that the landslides of dispersive soil in seasonally frozen regions could be categorized as shallow-seated landslides and deep-seated landslides. The preconditions for landslide occurrence were soil mass looseness and cracks, caused by freeze-thawing. The degradation of dispersive soil led to a rapid influx of water into the soil. The reason for shallow-seated landslides was that the numerous sodium ions present in the soil mass dissolved in water and damaged the soil structure, resulting in a substantial reduction in shear strength. The reason for deep-seated landslides, however, was the erosion due to rainfall infiltration after the shallow-seated landslides caused tensile cracks at the top of the slope, leading to soil instability. Landslide failures occurred when the dispersing soil slope underwent freeze-thawing and saturated soaking. The sliding surface was initiated at the top of the slope and gradually progressed to the bottom along the interface between the soil layers.

Sign in / Sign up

Export Citation Format

Share Document