The methods combined by test, field monitoring and theoretical analysis were adopted to do the systemic research on the rock mass from micro-structure to macro-deformation, and rheological model of Jinchuan rock mass ...The methods combined by test, field monitoring and theoretical analysis were adopted to do the systemic research on the rock mass from micro-structure to macro-deformation, and rheological model of Jinchuan rock mass was established to discuss the reasonable supporting time. Resuhs show that supporting after suitable stress and displacement release can benefit for the long-term stability of surrounding rock.展开更多
This paper presents an experimental investigation of the microstructural development upon in situ compression and heating of pure and SiO2 gel-doped （5 wt%） polycrystalline halite, with grain sizes ranging from 45 ...This paper presents an experimental investigation of the microstructural development upon in situ compression and heating of pure and SiO2 gel-doped （5 wt%） polycrystalline halite, with grain sizes ranging from 45 μm to 〉70 μm （cold pressed at 200 MPa and heated at 150 ℃ for one week）, using high energy synchrotron x-ray radiation. Texture development of the samples was studied at room temperature, 100, 200 and 300 ℃. At each temperature, the samples were axially compressed keeping the load constant at every -500 N step up to the maximum 2,400 N （- 48 MPa）. At the different loads and temperatures, 2D images and load/elongation curves were recorded in situ to get information about the texture development and the rheological behaviour of the potycrystalline halite samples. At high stresses, the doped halite samples show an increase in the elastic moduli and in the microstrain The results were confirmed by the single grain orientation analyses using the FABLE program, where a sharpening of the texture was observed.展开更多
文摘The methods combined by test, field monitoring and theoretical analysis were adopted to do the systemic research on the rock mass from micro-structure to macro-deformation, and rheological model of Jinchuan rock mass was established to discuss the reasonable supporting time. Resuhs show that supporting after suitable stress and displacement release can benefit for the long-term stability of surrounding rock.
文摘This paper presents an experimental investigation of the microstructural development upon in situ compression and heating of pure and SiO2 gel-doped （5 wt%） polycrystalline halite, with grain sizes ranging from 45 μm to 〉70 μm （cold pressed at 200 MPa and heated at 150 ℃ for one week）, using high energy synchrotron x-ray radiation. Texture development of the samples was studied at room temperature, 100, 200 and 300 ℃. At each temperature, the samples were axially compressed keeping the load constant at every -500 N step up to the maximum 2,400 N （- 48 MPa）. At the different loads and temperatures, 2D images and load/elongation curves were recorded in situ to get information about the texture development and the rheological behaviour of the potycrystalline halite samples. At high stresses, the doped halite samples show an increase in the elastic moduli and in the microstrain The results were confirmed by the single grain orientation analyses using the FABLE program, where a sharpening of the texture was observed.
