Quantitative morphotectonic analysis as a tool for detecting deformation patterns in soft-rock terrains: a case study from the southern Marches, Italy / Analyse morphotectonique quantitative dans une province lithologique enregistrant mal les déformations : les Marches méridionales, Italie

2004 ◽  
Vol 10 (4) ◽  
pp. 267-284 ◽  
Author(s):  
Marta Della Seta ◽  
Maurizio Del Monte ◽  
Paola Fredi ◽  
Elvidio Lupia Palmieri
Keyword(s):  
Soft Rock ◽  
Deformation Patterns

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.

Support of soft rock tunnel at great depth designed by numerical modeling—A case study

2020 ◽  
pp. 619-622
Author(s):  
Hongwei Zhou ◽  
Yang Ju ◽  
Heping Xie ◽  
Geng Ma ◽  
Zhengliang Dong ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Soft Rock ◽  
Great Depth ◽  
Rock Tunnel

scholarly journals Failure Mechanism Analysis and Support Design for Deep Composite Soft Rock Roadway: A Case Study of the Yangcheng Coal Mine in China

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Bangyou Jiang ◽  
Lianguo Wang ◽  
Yinlong Lu ◽  
Shitan Gu ◽  
Xiaokang Sun
Keyword(s):  
Failure Mechanism ◽  
Coal Mine ◽  
Failure Mechanisms ◽  
Soft Rock ◽  
Deformation Monitoring ◽  
Surrounding Rock ◽  
Support Design ◽  
Soft Rock Roadway ◽  
Rock Roadway

This paper presented a case study of the failure mechanisms and support design for deep composite soft rock roadway in the Yangcheng Coal Mine of China. Many experiments and field tests were performed to reveal the failure mechanisms of the roadway. It was found that the surrounding rock of the roadway was HJS complex soft rock that was characterized by poor rock quality, widespread development of joint fissures, and an unstable creep property. The major horizontal stress, which was almost perpendicular to the roadway, was 1.59 times larger than the vertical stress. The weak surrounding rock and high tectonic stress were the main internal causes of roadway instabilities, and the inadequate support was the external cause. Based on the failure mechanism, a new support design was proposed that consisted of bolting, cable, metal mesh, shotcrete, and grouting. A field experiment using the new design was performed in a roadway section approximately 100 m long. Detailed deformation monitoring was conducted in the experimental roadway sections and sections of the previous roadway. The monitoring results showed that deformations of the roadway with the new support design were reduced by 85–90% compared with those of the old design. This successful case provides an important reference for similar soft rock roadway projects.

A case study on large deformation failure mechanism of deep soft rock roadway in Xin'An coal mine, China

2017 ◽  
Vol 217 ◽  
pp. 89-101 ◽  
Author(s):  
Sheng-Qi Yang ◽  
Miao Chen ◽  
Hong-Wen Jing ◽  
Kun-Fu Chen ◽  
Bo Meng
Keyword(s):  
Large Deformation ◽  
Failure Mechanism ◽  
Coal Mine ◽  
Soft Rock ◽  
Soft Rock Roadway ◽  
Rock Roadway
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