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Fig.1 Model of intact rock mass before and after bottom excavation Table.1 Mechanical parameters of model Materials Heterogeneity Elastic modulus (MPa) Compressive strength (MPa) Poisson’s ratio Weight density (KN/m3) Surrounding rock 6 20 80 0.25 26.2 Steel-fiber concrete CF30 8 25 120 0.18 28.00 Anchor bolt 200 210 345 0.3 78.4 Simulation results and discussion The graphs of elastic modulus and acoustic emission (AE) are shown in fig.2.
Acknowledgements This work was financially supported by the Major State Basic Research Development Program of China (2011CB013500), the Foundation for Innovation Research Groups of the National Natural Science Foundation of China (51121005), the National Natural Science Foundation of China (50909013).
References [1] R.S.Read:International Journal of Rock Mechanics and Mining Sciences, Vol.41 (2004), p.1251-1275 [2] D.Charpentier, D.Tessier and M.Cathelineau: Engineering Geology, Vol.70 (2003), p.55-69 [3] Guangzhe Deng: Chinese Journal of Rock Mechanics and Engineering, Vol.20 (2001), p.440-442 (in Chinese) [4] Wenping Wu, Xiating Feng, Chuanqing Zhang, et al.Chinese Journal of Rock Mechanics and Engineering, Vol.30 (2011), p.1782-1802 (in Chinese) [5] Chun’an Tang: International Journal of Rock Mechanics and Mining Sciences, Vol.34(1997), p.249-261.

Ni3Al intermetallic acted as the mechanical barriers that weakened the expandsion of the cracks into the materials which developed crosswise along the surface with a uniform peeling off.
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Study on Toxicity of Copper Oxide Engineered Nanoparticles to Tobacco BY-2 Cells Lili Xu1,a, Haijun Sui1,b Xiaoyun Liu2,c and Zhenyu Wang1,d* 1Key Laboratory of Marine Environment & Ecology, Ministry of Education College of Environmental Science and Engineering 2 College of Materials Science and Engineering Ocean University of China, Qingdao, China axulili251143@126.com,b shj520yy@126.com, cliuxiaoyun@ouc.edu.cn,dwang0628@ouc.edu.cn Keywords: CuO ENPs; Cell viability; TTC; Plasmolysis.
Materials and Methods CuO ENPs were purchased from Sigma-Aldrich.
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Introduction Graphene has potential applications in many fields such as nanoelectronic devices, cells, sensors, and composite materials because of its special properties [1].
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Nano-SiC is a kind of excellent non-oxide ceramic materials, with high hardness, good wear resistance and self-lubricating, high thermal conductivity, low thermal expansion coefficient and outstanding high temperature strength, etc[6].
Experimental 2.1 Raw materials Caprolactam with the grade of AR was provided by Ludwigshafen Corporation of Germany.
Acknowledgement The authors gratefully acknowledge the support of Science and Technology Program from Jiangxi Provincial Department of Education, China ( No.CJJ10377) References [1] Bofen Huang,Dan Li,Zhiyuan Li.et al.Journal of Applied Polymer Science.Vol.122(2011),p.586
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Thus, for example, ammonium and sodium hydrogen carbonates increase the water resilience of materials containing silicate solutions.
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Therefore, the usage of acoustic monitoring of the presence of defects and the destruction of such materials is difficult because of the high ultrasound damping decrement in these materials.
The use of an acoustic method for uncovering the presence of the imperfections and damages in such materials is difficult because of the high ultrasound attenuation in these materials.
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Ltd, Guangzhou Research, Development and Engineering Center of Polymer Materials & Core Processing Equipments, Guangzhou, 510640, China acxdzlgzhnlg2003@163.com, bmmyhyi@scut.edu.cn Keywords: Aqueous polyurethane; Anionic polyester diols; Neutralization agent Abstract.
Experimental Materials.
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