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Jianhua, Li
- Analysis on the Anti Vibration and Liquefaction Properties of Silt Sands
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Authors
Affiliations
1 School of Civil Engineering, Northeast Forestry University, Harbin, CN
1 School of Civil Engineering, Northeast Forestry University, Harbin, CN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 6 (2016), Pagination: 2724-2730Abstract
In order to research the anti-liquefaction strength of the silt sands in subgrade engineering under the condition of vibration force, the soil samples of silt sands were used to do the dynamic triaxial test under different conditions using the bi-directional electromagnetic vibration triaxial apparatus. After that the influence of the anti-liquefaction strength caused by the dry density and fine particle content was analyzed. The results indicate that the larger dry density is, the stronger the property of anti-liquefaction will be; the anti-liquefaction strength won't increase with the increase of fine particle content, but will decrease to a nearly minimum value when the fine particle content is 40%. Analyze the increasing law of pore water pressure and deformation when the saturated silt sands are liquefied by the classical mathematical model, which resolves the characteristics of vibratory liquefaction of silt sands subgrade.Keywords
Silt Sands, Subgrade, Triaxial Test, Liquefaction, Pore Water Pressure, Permanent Strain Potential.- Deformation-failure characteristics and control strategy of mining roadway roof in argillaceous rock
Abstract Views :90 |
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Authors
Affiliations
1 Institute of Mining Engineering, InnerMongolia University of Science and Technology, Baotou 014010, Inner Mongolia, MN
2 Lijiahao Mine, Shenhua Baotou Energy Co.,Ltd, Erdos 017000, Inner Mongolia, China, CN
1 Institute of Mining Engineering, InnerMongolia University of Science and Technology, Baotou 014010, Inner Mongolia, MN
2 Lijiahao Mine, Shenhua Baotou Energy Co.,Ltd, Erdos 017000, Inner Mongolia, China, CN
Source
Journal of Mines, Metals and Fuels, Vol 67, No 10 (2019), Pagination: 440-445Abstract
Aimed at the large amount of mining roadway roof subsidence in argillaceous rock, as well as frequently happened roof caving accidents, the mining roadway from Baode coal mine was taken as the research background. By the integrated use of field measurement, numerical simulation, and the theoretical analysis, the deformationfailure characteristics and engineering controllability of mining roadway roof in argillaceous rock was studied. The results indicate that: During the mining influence. This kind of roadway suffers serious roof deformation and failure and has little to do with the increase of the support strength. The roof subsidence is far out of the endurance of the anchor cable. The roof breakage depth is around 4.0m. With the existing technology, it is not available to limit the roof subsidence by high-strength bolting, and it is a must to adopt the supporting method with good extension property, which gives priority to roof caving control. Accordingly, the control strategy which gives priority to long-extension bolt appeared. The engineering testing results indicate that this technology can coordinate with the roof deformation, thus effectively prevent the roof caving.Keywords
Argillaceous rock; mining roadway; large deformation; long-extension bolt.References
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