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Nie, Lei
- Risk Assessment of the Chaancun Debris Flow Gully and Mitigative Measures in Dalian City, China
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Authors
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1 College of Construction Engineering, Jilin University, CN
1 College of Construction Engineering, Jilin University, CN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 6 (2016), Pagination: 2480-2485Abstract
The Chaancun debris flow gully is located on the mountain slope of the crown of the Chaancun landslide. The hiking corridor, leisure square, Lvshun middle road, and Wangjiadian reservoir are situated below the debris flow track. The Chaancun debris flow gully poses a serious threat to the safety of this site and to the development of tourist attractions. First, an appropriate recognition of the debris flow gully is required by a field investigation. This gully is steep and straight. The weathered and denuded rocks coming from the fault zone are the debris source. In addition, concentrated rainfall occurs in this area. Therefore, the debris flow gully has the forming conditions of a debris flow. Many factors affect the formation and assessment of a debris flow, and they result in uncertainty, randomness, and fuzziness. Therefore, the fuzzy mathematics method is suitable for the risk assessment of debris flow. To improve the reliability of the risk assessment of the Chaancun debris flow gully, primary fuzzy assessment and secondary fuzzy assessment considering hierarchical analysis were undertaken for quantitative risk assessment. This gully was categorized as "extremely hazardous;" thus, appropriate mitigations such as building a concrete dam and planting in bare areas were designed and implemented.Keywords
Debris Flow, Risk Assessment, Fuzzy Mathematics, Mitigative Measures.- Specific Surface Area of Construction Minerals
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Authors
Affiliations
1 College of Construction Engineering, Jilin University, Changchun 130 026 and Peng Tian and Gaofeng Zhan, Jilin Jianzhu University, Changchun 130 118., CN
1 College of Construction Engineering, Jilin University, Changchun 130 026 and Peng Tian and Gaofeng Zhan, Jilin Jianzhu University, Changchun 130 118., CN
Source
Journal of Mines, Metals and Fuels, Vol 66, No 6 (2018), Pagination: 311-316Abstract
Pore characteristics are the key index to characterize the surface characteristics of mineral materials. The surface pore characteristics of road of construction minerals are the key indexes to influence the adhesion and pavement performance of asphalt mixture. Adsorption and desorption experiments on limestone, andesite and basalt. Using nitrogen as adsorbent in the experiment. Through the calculation, the specific surface area and pore size distribution of multiple groups of mineral materials were obtained. The results show that the pore characteristics of the mineral surface are closely related to the composition and genesis. The average pore size and specific surface area of limestone are much higher than basalt and andesite. The average pore diameter of limestone is 5.6 times than that of basalt and 8 times than that of andesite. The BET specific surface area is 4.5 times than that of basalt and 7.8 times than that of andesite. Limestone is a sedimentary rock, the surface is rougher than that of basalt and andesite. There is a great difference in the texture of limestone from different quarries. The average pore size of basalt and andesite is similar, and the surface pore characteristics of them even produced by different quarries are close.Keywords
Specific surface area, pore, composition, adsorption, characteristic model.References
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