Effect of Degree of Weathering on Dynamic Properties of Residual Soils

Macari, Emir José; Hoyos, Laureano R.

doi:10.1061/(asce)0733-9410(1996)122:12(988)

Cited by 19 publications

(32 citation statements)

References 4 publications

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“…The percentage of microbially mediated Au detected in solution differed in soils from tropical (20% of total Au disseminated in the soil) and semi-arid (up to 55% of total Au) sites, and also compared to an earlier study with samples from the Tomakin Park Gold Mine in moderate south eastern New South Wales, where up to 80 wt% of the total Au was released into solution . The microbially mediated solubilization of Au was expected to be more rapid and the percentage of solubilized Au to be higher in the microcosms with samples from the tropical compared to the temperate or semi-arid sites, because microbial activity and universal weathering rates in tropical soils generally exceed those in temperate environments (Curtis, 1990;Macari and Hoyos, 1996). However, the observed lower rates of microbially mediated Au solubilization in Hit or Miss microcosms may be due to a microbial community that is limited in its capabilities to mediate the release of Au and/or to sorption of Au to the solid fractions or microorganisms.…”

Section: Implications For the Mobility Of Au And As In The Regolithmentioning

confidence: 99%

Mobility and microbially mediated mobilization of gold and arsenic in soils from two gold mines in semi-arid and tropical Australia

Reith

McPhail

2007

Geochimica et Cosmochimica Acta

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Section: Implications For the Mobility Of Au And As In The Regolithmentioning

confidence: 99%

Mobility and microbially mediated mobilization of gold and arsenic in soils from two gold mines in semi-arid and tropical Australia

Reith

McPhail

2007

Geochimica et Cosmochimica Acta

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“…This is most likely be caused by thelimited sensitivity of the seismic techniques within this layer. Both, CPT and SRT derived Young's 489 moduli show smaller values below the front of the lobe, between y = 33 m and 44 m. This is an 490 indication of a lower moisture content in this area (Gregory, 1976), but could also suggest a lower 491 local stress field and increased weathering/fabric dilation (Macari and Laureano, 1996). Direct 492 comparison of SRT derived Young's moduli with cone resistance at the CPT locations (Fig.…”

Section: Poisson's Ratiomentioning

confidence: 93%

Landslide characterization using P- and S-wave seismic refraction tomography — The importance of elastic moduli

Uhlemann

Hagedorn

Dashwood

et al. 2016

Journal of Applied Geophysics

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12In the broad spectrum of natural hazards, landslides in particular are capable of changing the 13 landscape and causing significant human and economic losses. Detailed site investigations form an 14 important component in the landslide risk mitigation and disaster risk reduction process. These 15 investigations usually rely on surface observations, discrete sampling of the subsurface, and 16 laboratory testing to examine properties that are deemed representative of entire slopes. Often this 17 requires extensive interpolations and results in large uncertainties. To compliment and extend these 18 approaches, we present a study from an active landslide in a Lias Group clay slope, North Yorkshire, 19 *Revised manuscript with No changes marked Click here to view linked References UK, examining combined P-and S-wave seismic refraction tomography (SRT) as a means of providing 20 subsurface volumetric imaging of geotechnical proxies. 21The distributions of seismic wave velocities determined from SRT at the study site indicated zones 22 with higher porosity and fissure density that are interpreted to represent the extent and depth of 23 mass movements and weathered bedrock zones. Distinguishing the lithological units was facilitated 24 by deriving the Poisson's ratio from the SRT data as saturated clay and partially saturated sandy silts 25showed distinctively different Poisson's ratios. Shear and Young's moduli derived from the SRT data 26 revealed the weak nature of the materials in active parts of the landslide (i.e. 25 kPa and 100 kPa 27 respectively). The SRT results are consistent with intrusive (i.e. cone penetration tests), laboratory, 28 and additional geoelectrical data form this site. This study shows that SRT forms a cost-effective 29 method that can significantly reduce uncertainties in the conceptual ground model of geotechnical 30 and hydrological conditions that govern landslide dynamics. 31

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“…However, for damping ratio ξ, there is no fixed expression for the normalization since ξ increases with increasing strain. Macari and Hoyos (1996) used ξ/ξ min while Zhang et al (2005) used (ξ-ξ min ). Often, the damping ratio is not normalised as shown in FIG.…”

Section: Non-linearity Of Soil Propertiesmentioning

confidence: 99%

“…However, studies on the dynamic behaviour of residual soils are generally scarce. Field and laboratory studies on residual soils are highly localised take for example Piedmont residual soils from Piedmont Province (Borden et al 1996, Macari and Hoyos 1996, Schneider et al 1999, tropical residual soil from Brazil (Correia et al 2001) and residual soils from…”

Section: Dynamic Properties Of Residual Soilmentioning

confidence: 99%

Properties of soils using laboratory seismic methods and numerical modelling

Cheng¹

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CHAPTER 4: Finite Element Modelling 4.1 Outline and Purpose 4.2 Introduction to LS-DYNA 4.3 Calibration for stiffness response 4.3.1 The Timoshenko beam effect 4.3.2 Verification of the finite element model 102 4.3.3 Finite element simulation program 104 4.3.4 Correction factor for the Timoshenko beam effect 105 4.3.5 Validation of correction factor χ m 108 4.4 Calibration for damping response 114 4.4.1 The Viscoelastic material model 114 4.4.2 Input Parameters for Viscoelastic Model 118 4.4.3 Finite element simulation program 120 4.4.4 Calibration of viscoelastic model using simulated resonant column test 122 4.4.5 Wave Propagation in a semi-infinite medium 125 4.5 Simulations for the Verification of the Hilbert Transform Method 128

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Effect of Degree of Weathering on Dynamic Properties of Residual Soils

Cited by 19 publications

References 4 publications

Mobility and microbially mediated mobilization of gold and arsenic in soils from two gold mines in semi-arid and tropical Australia

Mobility and microbially mediated mobilization of gold and arsenic in soils from two gold mines in semi-arid and tropical Australia

Landslide characterization using P- and S-wave seismic refraction tomography — The importance of elastic moduli

Properties of soils using laboratory seismic methods and numerical modelling

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