Geophysical Research on Rock Mass Quality Evaluation for Infrastructure Design

Hasan, Muhammad; Shang, Yanjun; Shao, Peng; Yi, Xu; He, Meng

doi:10.1029/2021ea002017

Cited by 9 publications

(9 citation statements)

References 65 publications

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“…ERT is a commonly used geophysical practice that can investigate the heterogeneous subsurface with high-resolution lateral and vertical imaging of resistivity 1 , 17 , 18 , 27 , 28 , 32 , 39 . Electrical resistivity measured in ERT surveys is controlled by different factors, including subsurface rock/lithology type, mineralogy, weathering degree, clay, fractures and faults, porosity, rock association, temperature, water content, pores electrical connectivity, salinity, permeability and rock alteration 15 , 32 .…”

Section: Methodsmentioning

confidence: 99%

“…The necessary bearing competency for engineered structures is provided by the foundation rocks 10,11 . Geomechanical parameters are mainly used to estimate the rock mass bearing potency in engineering construction and groundwater exploitation [12][13][14][15] .Rock mass evaluation is mostly carried out using geomechanical parameters, namely rock core index (RCI), Young's modulus (E), rock quality designation (RQD), volumetric joint counts (Jv), and rock mass integrity coefficient (Kv) 1,2,10,[15][16][17][18][19] . RCI and RQD provide basis for understanding the rock characteristics.…”

mentioning

confidence: 99%

“…Rock mass evaluation is mostly carried out using geomechanical parameters, namely rock core index (RCI), Young's modulus (E), rock quality designation (RQD), volumetric joint counts (Jv), and rock mass integrity coefficient (Kv) 1,2,10,[15][16][17][18][19] . RCI and RQD provide basis for understanding the rock characteristics.…”

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confidence: 99%

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Evaluation of rock mass units using a non-invasive geophysical approach

Hasan,

Shang,

Meng

2023

Sci Rep

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Thorough and accurate assessment of rock mass units is important for development of engineering infrastructures and groundwater resources assessments. Rock mass units are widely evaluated by reliable geomechanical parameters namely rock quality designation (RQD) and rock core index (RCI). Conventionally, these parameters are acquired via an extensive number of geotechnical tests. Such tests, however, suffer efficiency for data coverage, cost, equipment and topographic constrictions, and hence cause ambiguity in geological models for a detailed evaluation of rock mass integrity. Conversely, geophysical surveys offer fast, more user-friendly, less invasive, more cost-effective and less time-consuming approach for geological investigations. The past research confirms a useful link between geophysical and geotechnical parameters. But, none of the past studies provides a suitable and generalized relation between these parameters which can reduce geotechnical model uncertainty mostly caused by inadequate data and subsurface heterogeneity. This paper proposes a meaningful and feasible method to obtain geomechanical parameters using a certain number of drillings and geophysical data of four different sites. Based on electrical resistivity obtained from electrical resistivity tomography (ERT) and controlled-source audio-frequency magneto telluric (CSAMT), this research provides the general and adaptable formulas for geotechnical parameter estimation and reduces geological model uncertainty for more detailed 2D/3D imaging of RQD and RCI covering the whole sites where even no drilling data exists. Thus, the investigated sites are assessed laterally and vertically along each geophysical profile via distinct value ranges of geological parameters for a thorough and reliable evaluation of rock mass units in highly heterogeneous setting. Our research reduces the ambiguity caused by structural heterogeneities and scarce data, fills the gap between inadequate well tests and the true geological models, and gives new insights into the rock mass units for proper engineering design and groundwater exploitation.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Evaluation of rock mass units using a non-invasive geophysical approach

Hasan,

Shang,

Meng

2023

Sci Rep

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“…The core recovery also provided information about compact and loose lithologies [38,39]. Rock Quality Designation (RQD) values [40] also demarcated the joints and fracture information that were correlated with available results of ERT and surface geology [39,[41][42][43].…”

Section: Geotechnical Data Acquisitionmentioning

confidence: 99%

Integrated Geophysical and Geotechnical Approaches for Evaluating Dam Seepage in Lesser Himalayan Region of Pakistan

et al. 2023

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Dam leakage is a major problem in earth-filled reservoir dams. The present research is aimed at detecting the seepage zones in an earth-filled reservoir dam in the vicinity of Sarobi village, North Waziristan, Pakistan. The objective was achieved by integrating geological, geotechnical, and geophysical datasets. Geological survey was carried out in the area to identify the surface exposures. Geotechnical data involved was used to estimation of permeability and Lugeon values to identify network of joints/fractures whereas electrical resistivity tomography (ERT) technique (utilizing Wenner-Schlumberger configuration) was applied for the identification of the leakage zones. Geological data revealed highly deformed alluvium towards the right abutment underlain by compressed shale and highly fractured limestone beds. Geotechnical data indicated high permeability, Lugeon values, and concentration of sand and gravel towards the right abutment whereas low permeability, Lugeon values, and higher concentration of silt and clay were observed towards the left abutment. ERT data identified a conductive zone embedded between impermeable lithologies having resistivity between 10 and 60 Ω·m. This conductive zone was observed in parallel profiles acquired in upstream, dam crest, and downstream parts of the dam. The integration of all the datasets revealed a network of joints that are interconnected and provide a path for water at the upstream side to pass through right abutment of dam and leak towards the downstream.

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“…According to [2], the stability and behaviour of both natural and manufactured rock slopes depend critically on geological structures like folds, faults, and discontinuities. The primary geotechnical factor in classifying rock mass quality is the rock quality designation (RQD) [3]. In general, RQD measures the general stability in the engineering rock mass.…”

Section: Introductionmentioning

confidence: 99%

The Utilisation of Electrical Resistivity Imaging (ERI) for Geological Structures Mapping in Rock Mass: A Review

Ramli

Hussin

Kahar

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Electrical Resistivity Imaging (ERI) is an in-situ geophysical method widely used in environmental, engineering and hydrogeological explorations due to cost, time, and data coverage efficiency. Traditionally, geotechnical parameters such as discontinuities properties are obtained from rock samples acquired from a borehole. However, it only provides a single information point, costly and time-consuming. Thus, an approach using electrical resistivity to detect the presence of geological structure in a rock mass is an alternative method that can be applied. Discontinuities in rock mass include joints, bedding planes, blasting cracks, fractures, faults, and folds. This paper aims to present the utilisation of geoelectrical resistivity imaging for geological structures mapping in rock mass based on the review from previous research. The Electrical Resistivity Imaging (ERI) method is an effective tool to obtain structural differentiation of geological medium by interpreting 2D and even 3D electrical resistivity models. Electrical Resistivity Imaging (ERI) is an automated data acquisition system, inversion codes, non-invasive and user-friendly. The raw data received from data acquisition was analysed using Res2DINV software. The data inversion was done by applying the robust method and finite element grid to accommodate the steep topography. The data interpretation included numerical modelling to assess the suitability of all used electrode arrays in relation to the geological setting.

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Geophysical Research on Rock Mass Quality Evaluation for Infrastructure Design

Cited by 9 publications

References 65 publications

Evaluation of rock mass units using a non-invasive geophysical approach

Evaluation of rock mass units using a non-invasive geophysical approach

Integrated Geophysical and Geotechnical Approaches for Evaluating Dam Seepage in Lesser Himalayan Region of Pakistan

The Utilisation of Electrical Resistivity Imaging (ERI) for Geological Structures Mapping in Rock Mass: A Review

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