Implications on Characterizing the Extremely Weak Sherwood Sandstone: Case of Slope Stability Analysis Using SRF at Two Oak Quarry in the UK

Sattler, T; Paraskevopoulou, Chrysothemis

doi:10.1007/s10706-018-0732-3

Cited by 13 publications

(1 citation statement)

References 24 publications

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“…An advantage of the GSI system is that it provides a field method for characterising rock masses, by basic geological observations (Marinos et al 2005). It should be highlighted outcrops, although an extremely valuable data source, are susceptible to surface relaxation, weathering and alteration, which needs consideration when assessing the likely GSI values at depth (Sattler and Paraskevopoulou 2019). Marinos and Hoek (2001) developed extensions for heterogeneous and lithologically varied sedimentary rock masses, similar to the BLI and later advanced by Marinos (2019).…”

Section: Tunnelling Through Bli Considerations and Ground Behaviourmentioning

confidence: 99%

Assessing TBM performance in heterogeneous rock masses

Sissins

Paraskevopoulou

2021

Bull Eng Geol Environ

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A major challenge that TBM performance is requested to deal with for a successful and effective progress is tunnelling through lithologically and geomechanically heterogeneous rock masses. Such heterogeneous environments are common and recent tunnel examples in the UK include the Hinckley Point C offshore cooling tunnels being driven through interbedded carbonaceous mudstone/shales and argillaceous limestone and the Anglo American’s Woodsmith Mine Mineral Transport System tunnel in Redcar Mudstone with beds of ironstone. This inherent geological heterogeneity leads to difficult tunnelling conditions that initially stem from predicting a sound and representative ground model that can be used to preliminary assess the TBM performance. In this work, an exhaustive review of existing TBM Penetration Rate (PR) methods identified that no models address the issue of parameter selection for heterogeneous rock masses comprising layers with different rock strengths. Consequently, new approaches are required for estimating rock mass behaviour and machine performance in such environments. In the presented work the Blue Lias Formation (BLI), which is characterised by its layered rock mass, comprising very strong limestone, interbedded with weak mudstone and shales, is investigated. BLI formation is considered herein being a representative example of lithological heterogeneity. Based on the fieldwork carried out in three localities in the Bristol Channel Basin (S. Wales and Somerset), geological models are produced based on which a geotechnical model is developed, and four ground types are determined. Implications of the current findings for TBM performance are assessed, including faulting, groundwater inflow and excavation stability with a particular focus on both PR and advance rate. A modified approach using the existing empirical models is proposed, developed and presented in this paper that can be used as a guide to determine TBM performance in heterogeneous rock masses reducing the risk of cost and time overruns.

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Section: Tunnelling Through Bli Considerations and Ground Behaviourmentioning

confidence: 99%

Assessing TBM performance in heterogeneous rock masses

Sissins

Paraskevopoulou

2021

Bull Eng Geol Environ

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Compressive and Tensile Strength Anisotropy of Friable Sandstone and Thin-Bed Shale of the Pleistocene Erin Formation: Insights for Safe Operating Mud Weight Windows for Vertical and Horizontal Wells

Harrypersad-Daniel,

Blake,

Ramsook

2023

Pure Appl. Geophys.

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Stability Analysis of Shafts Used for Minewater Heat Recovery

Paraskevopoulou

Shaw

2019

Geotech Geol Eng

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Traditional heating using non-renewable energy resources contributes up to 50% of current carbon emission level. Different sources of renewable energy are being exploited and developed to lower the carbon emission level for continuity of healthy living environment. It is found that thermal energy is stored in minewater flooding abandoned mines. The minewater can be extracted through newly drilled boreholes or existing mineshafts. To ensure successful and sustainable operation, mineshafts have to be structurally stable. When the mines are abandoned, the water level tends to recover. Some of the configurations of the minewater heat recovery may change the temperature of part of the shaft wall. This research aims to provide some insight on the stability of mineshafts for minewater heat recovery through numerical sensitivity analyses on: (a) water level, (b) temperature fluctuations. In the presented research work, rock masses with different properties have been analyzed. Change in temperature is found to mainly change the static Young's Modulus of intact rock and the joint roughness. However, the joint roughness is expressed indirectly using the Geological Strength Index, which has direct relationship with joint roughness and is used in stability analysis. It is found that an increase in water level reduces the integrity of the whole shaft. The degrees of stability deterioration are different at different depths and depend on the in situ stress state. Findings of this analyses can be assist in making a decision on the selection of the appropriate configuration for minewater heat recovery.

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Implications on Characterizing the Extremely Weak Sherwood Sandstone: Case of Slope Stability Analysis Using SRF at Two Oak Quarry in the UK

Cited by 13 publications

References 24 publications

Assessing TBM performance in heterogeneous rock masses

Assessing TBM performance in heterogeneous rock masses

Compressive and Tensile Strength Anisotropy of Friable Sandstone and Thin-Bed Shale of the Pleistocene Erin Formation: Insights for Safe Operating Mud Weight Windows for Vertical and Horizontal Wells

Stability Analysis of Shafts Used for Minewater Heat Recovery

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