A path for evaluating the mechanical response of rock masses based on deep mining-induced microseismic data: A case study

2021 ◽  
Vol 115 ◽  
pp. 104025
Author(s):  
Yong Zhao ◽  
Tianhong Yang ◽  
Honglei Liu ◽  
Shuhong Wang ◽  
Penghai Zhang ◽  
...  
Keyword(s):  
Mechanical Response ◽  
Rock Masses ◽  
Deep Mining ◽  
Microseismic Data

Method for Generating a Discrete Fracture Network from Microseismic Data and its Application in Analyzing the Permeability of Rock Masses: a Case Study

2019 ◽  
Vol 52 (9) ◽  
pp. 3133-3155 ◽  
Author(s):  
Yong Zhao ◽  
Tianhong Yang ◽  
Penghai Zhang ◽  
Haiyan Xu ◽  
Jingren Zhou ◽  
...  
Keyword(s):  
Fracture Network ◽  
Discrete Fracture Network ◽  
Rock Masses ◽  
Microseismic Data ◽  
Discrete Fracture

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

Implementation of InfraRed Thermographic surveys in complex coastal areas: the case study of Polignano a Mare (southern Italy)

2021 ◽  
Author(s):  
Lidia Loiotine ◽  
Marco La Salandra ◽  
Gioacchino Francesco Andriani ◽  
Eliana Apicella ◽  
Michel Jaboyedoff ◽  
...  
Keyword(s):  
Rock Mass ◽  
Structure From Motion ◽  
Southern Italy ◽  
Thermal Imager ◽  
Rock Masses ◽  
Field Surveys ◽  
Thermal Images ◽  
Thermal Anomalies ◽  
Rock Face

<p><em>InfraRed Thermography</em> (IRT) spread quickly during the second half of the 20<sup>th</sup> century in the military, industrial and medical fields. This technique is at present widely used in the building sector to detect structural defects and energy losses. Being a non-destructive diagnostic technique, IRT was also introduced in the Earth Sciences, especially in the volcanology and environmental fields, yet its application for geostructural surveys is of recent development. Indeed, the acquisition of thermal images on rock masses could be an efficient tool for identifying fractures and voids, thus detecting signs of potential failures.<br>Further tests of thermal cameras on rock masses could help to evaluate the applicability, advantages and limits of the IRT technology for characterizing rock masses in different geological settings.<br>We present some results of IRT surveys carried out in the coastal area of Polignano a Mare (southern Italy), and their correlation with other remote sensing techniques (i.e. <em>Terrestrial Laser Scanning</em> and <em>Structure from Motion</em>). The case study (<em>Lama Monachile</em>) is represented by a 20 m-high cliff made up of Plio-Pleistocene calcarenites overlying Cretaceous limestones. Conjugate fracture systems, karst features, folds and faults, were detected in the rock mass during field surveys. In addition, dense vegetation and anthropogenic elements, which at places modified the natural setting of the rock mass, represent relevant disturbances for the characterization of the rock mass. In this context, IRT surveys were added to the other techniques, aimed at detecting the major discontinuities and fractured zones, based on potential thermal anomalies. <br>IRT surveys were carried out in December 2020 on the east side of the rock mass at <em>Lama Monachile</em> site. Thermal images were acquired every 20 minutes for 24 hours by means of a FLIR T-660 thermal imager mounted on a fixed tripod. Ambient air temperature and relative humidity were measured during the acquisition with a pocketsize thermo-hydrometer. A reflective paper was placed at the base of the cliff to measure the reflected apparent temperature. In addition, three thermocouple sensors were fixed to the different lithologic units of the rock face. These parameters, together with the distance between the FLIR T-660 and the rock face, were used in order to calibrate the thermal imager and correct the apparent temperatures recorded by the device, during the post-processing phase. Successively, vertical profiles showing the temperature of the rock face over time were extracted from the thermograms. Thermal anomalies were correlated with stratigraphic and Geological Strength Index profiles, obtained by means of field surveys and Structure from Motion techniques. The presence of fracture and voids in the rock mass was also investigated.</p>

Approaches for mapping suscepibility to rockfalls initiation in carbonate rock-masses. A case study from the from the Sorrento coast (southern Italy)

2013 ◽  
Vol 132 (3) ◽  
pp. 380-393 ◽  
Author(s):  
Donatella Apuzzo ◽  
Pantaleone De Vita ◽  
Biagio Palma ◽  
Domenico Calcaterra
Keyword(s):  
Carbonate Rock ◽  
Southern Italy ◽  
Rock Masses

scholarly journals Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut

2019 ◽  
Vol 7 (5) ◽  
pp. 1867-1881 ◽  
Author(s):  
Yin Shuaifeng ◽  
Ma Haifeng ◽  
Cheng Zhiheng ◽  
Zou Quanle ◽  
Li Yingming ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Deep Mining ◽  
Enhancement Mechanism ◽  
Permeability Enhancement

scholarly journals New Mathematical Modelling of Stabilizing Pile with Prestressed Tieback Anchors

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Cheng Huang ◽  
Wei-zhong Ren ◽  
Ling-wei Kong
Keyword(s):  
Differential Equations ◽  
Mathematical Modelling ◽  
Mechanical Response ◽  
High Accuracy ◽  
Comparative Case Study ◽  
System Of Differential Equations ◽  
Slope Stabilization ◽  
Stabilizing Piles ◽  
Stabilizing Pile

This paper presents a novel mathematical modelling for analyzing stabilizing piles with prestressed tieback anchors. The new differential equations governing the mechanical response of the stabilizing pile are formulated and the boundary conditions considering the tie-back anchors are mathematically specified. Then, the system of differential equations is numerically solved by the high-accuracy Runge-Kutta finite difference method. A simple computer program has been written on the platform of MATLAB to run the procedure of the proposed algorithm. This approach is entirely different from the traditional finite element method used to design the anchored piles. The FEM is employed to verify the feasibility of the developed method. The comparative case study indicates that the proposed method has more higher modeling and computing efficiency than the FEM and can be an alternative method for designing the anchored pile used for slope stabilization.

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