Evaluation of Engineering Rock Mass Quality via Integration Between Geophysical and Rock Mechanical Parameters

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

doi:10.1007/s00603-021-02766-8

Cited by 18 publications

(15 citation statements)

References 48 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%

“…Accurate assessment of geological models for engineering design and groundwater evaluation is extremely challenging in geotechnical engineering 1 , 2 . Inadequate characterization of subsurface rock units often leads to structural dilapidation and potential foundation-related failures 3 – 5 .…”

Section: Introductionmentioning

confidence: 99%

“…Inadequate characterization of subsurface rock units often leads to structural dilapidation and potential foundation-related failures 3 – 5 . Given the natural heterogeneity and spatial variability in the subsurface environments, detailed geological knowledge of a construction site is necessary in order to propose structural foundations and effective earthworks 1 , 6 – 9 . The necessary bearing competency for engineered structures is provided by the foundation rocks 10 , 11 .…”

Section: Introductionmentioning

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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Hasan,

Shang,

Meng

2023

Sci Rep

Self Cite

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“…The instability process of rock can be quantitatively characterized by relevant rock mechanical parameters, which are usually obtained directly from boreholes. however, this geotechnical test procedure is time-consuming and costly [11]. it is relatively simple to determine the relevant mechanical properties of rock through laboratory tests [12][13].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

2023

Archives of Mining Sciences

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Mechanical ProPerties and energy of sandstone Under cyclic loadingin evolUtionary Pattern exPeriMental stUdies in order to explore the mining failure law of deep coal seam floor and clarify the mechanical behavior and energy change in the floor strata during mining, the mechanical properties and energy evolution law of sandstone under cyclic loading with different confining pressures (20, 30, 40 MPa) were studied using the Rock Top multi-field coupling tester. The results are as follows: (1) the hysteresis phenomenon of a rock stress-strain curve under cyclic loading is evident. Moreover, the hysteresis loop migrates to the direction of strain increase, and the fatigue damage caused by cyclic loading has a certain weakening effect on the peak strength of rock; (2) both the number of cycles and the axial strain show a nonlinear change characteristic that satisfies the quadratic function relationship. Among them, the stress level of the rock is the main factor affecting the fitting effect; (3) under the same confining pressure, with an increase in cycle level, the macroscopic deformation of the rock increases, the accumulation of fatigue damage in the sample increases, and the irreversible deformation of the rock increases, which leads to an increase in energy input and dissipation; (4) in terms of elastic energy and dissipation energy, elastic energy plays a dominant role. in the initial cycle, the rock is destroyed, and the rock energy loss is great. After the second cycle, the input energy is mainly stored in the rock in the form of elastic energy, and only a small part of the input energy is released in the form of dissipation energy; (5) the confining pressure can improve the efficiency of rock absorption and energy storage, enhance the energy storage limit of rock, and limit the dissipation and release of partial energy of rock. The greater the confining pressure, the more evident the limiting effect, and the more significant the dominant position of elastic energy; and (6) the change in the energy dissipation ratio can be divided into three stages: rapid decline stage, stable development stage and rapid rise stage. The greater the increase in dissipation energy, the greater the degree of rock damage. The evolution process of the energy dissipation ratio can reflect the internal damage accumulation process of rock well, which can be used as the criterion of rock instability.

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“…Detailed geotechnical exploration programs developed for these purposes, mainly in the mining industry, frequently include inclined boreholes, many of which avoid intangible zones or risk zones, as well as determining the mechanical properties of a specific zone (rock mass quality, permeability, etc.) [11][12][13]. However, it is impossible to perform DH tests in these boreholes because there are no interpretation methods for this type of borehole [14].…”

Section: Introductionmentioning

confidence: 99%

Interpretation Methods for Seismic Downhole Test in Inclined Boreholes

Bautista,

Aguilar

2023

Civ Eng J

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Geotechnical investigations often involve inclined boreholes, which can be used for downhole (DH) seismic surveys. However, as there is no interpretation method for downhole tests in inclined boreholes (IDH), this study proposes alternative interpretation methods based on the direct method (DM), interval method (IM), modified interval method (MIM), and refracted ray path method (RRM). We have named the proposed methods, adding an I to the original name to indicate that they are performed in an inclined well, i.e., DMI, IMI, MIMI, and RRMI. To analyze the applicability of the proposed methods, eight simple models with horizontal layers and four 2D models were used to obtain the P- and S-wave velocity profiles. Among all the proposed methods, the RRMI method showed the best fit between the calculated S-wave velocity (Vs) profile and the real models, providing good reliability. To test the equations and hypotheses, new interpretation steps were developed based on Snell's law and a modification of the numerical bisection method, which showed that the error increased slightly as the dip angle of the well decreased. The next step was to test the accuracy of the RRMI method in the field and develop downhole test processing software for vertical and inclined boreholes. Doi: 10.28991/CEJ-2023-09-10-016 Full Text: PDF

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Evaluation of Engineering Rock Mass Quality via Integration Between Geophysical and Rock Mechanical Parameters

Cited by 18 publications

References 48 publications

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

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

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

Interpretation Methods for Seismic Downhole Test in Inclined Boreholes

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