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Study on dynamic stability of large-scale underground cavern group during construction period of hydropower station Weiping NIE 1,2,a, Chong SHI 3,b 1Guangdong Electric Power Design Institute, Guangzhou, 510663, China 2College of Civil and Hydraulic Engineering, Tsinghua University, Beijing 100084, China 3Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China a nwp_jzit@tom.com, b wpnie@foxmail.com Key words: surge tank; surrounding rock stability; dynamic stability; rock-point safety factor; the second lining Abstract: Taking excavation and supporting of surge tank large-scale underground cavern group of Nuozhadu hydropower station as example, the stability of surrounding rock is analyzed systematically, and the best lining scheme is obtained.
According to lining scheme comparison, the scheme that concrete of surge tank pouring to elevation 625.5m is the most economic and reasonable lining scheme for this engineering. 1 Introduction Various excavation and supporting styles will lead to various surrounding rock stress-strain relationships and obtain various stability effects [1].
The civil engineering in China is in vigorous development construction stage, more and more large engineering constructions send huge challenge to geotechnical workers[2].
The lining concrete’s thickness is 1.5m; it uses elastic material simulation; for the mechanical parameters of lining material, see Table 4; for the diagrammatic sketch of the lining of surge tank, see Fig.8.
References [1] XIAO Ming: submitted to Chinese Journal of Geotechnical Engineering(2000) [2] RU Zhong-liang, FENG Xiating, LI Hongdong, et al: submitted to Chinese Journal of Rock Mechanics and Engineering (2006) [3] WANG Haijun, REN Xuhua, ZHANG Jixun: submitted to Journal of China Three Gorges University(Natural Sciences)(2009) [4] SU Xiangzhen, HE Jiangda: submitted to Sichuan Water Conservancy(2006) [5] YE Chao, XIAO Ming, YANG Yaling: submitted to Rock and Soil Mechanics(2008) [6] QIAN Xiangdong，JIAO Ciahong: submitted to Advances in Science and Technology of Water Resources(2007) [7] NIE Weiping, XU Weiya, ZHOU Xianqi: submitted to Chinese Journal of Rock Mechanics and Engineering(2009)

Biomaterials have a hierarchical structure with outstanding mechanical properties that are far beyond those additional engineering materials.
Mechanics theories on the stiffness, hardness, strength and toughness of biomaterials can be expected to play a key role in developing bio-inspired multi-functional and hierarchical materials in future.
Generally, adopting some light alloy and composite materials as well as the light structure, such as honeycomb, rumple and foam, is a key approach to implement high performance material and structural efficiency.
The mechanical properties of these raw materials are common.
Traditional methods for testing the mechanical properties of macro-scale engineering materials are unreachable until the nano indentation techniques were developed [20].

The theme of decoration engineering has its own characteristics different from other engineering in several factors in the idea, positioning, functions and social influence of the project, and the said theme shall penetrate in the entire construction process.
This process may be divided into steps of ascertaining the target, collecting materials, conducting creation and validating the creation.
In the age of fast economic development, the issues of social benefits shall be always noted by each engineering technical personnel.
The designer shall be good at using advanced materials and means to put sound foundation for realizing the design idea.
Now matter how environmental friendly are these materials, they are after all chemicals and their contamination completely exists.

Since welded constructions are widely used in engineering, a certain flaws in welded joints may occur either in process of welding or in exploitation period.
Such difference in materials usually results in yield strength difference between materials, represented with mismatch factor, and it is commonly present in welds where high strength low-alloyed steels were welded.
Weld centre cracks, Engineering Fracture Mechanics (2001), 68, p. 163–182
Schwalbe: Compendium of yield load solutions for strength mis-matched DE (T), SE (B) and C (T) specimens, Engineering Fracture Mechanics, (2001), 68, p. 1137–1151
Kim: Experimental J estimation equations for single-edge-cracked bars in four-point bend: homogeneous and bi-material specimens, Engineering Fracture Mechanics, (2002), 69, p. 793–811

Lattice Boltzmann Modeling of the Effective Thermal Conductivity for Complex Structured Multiphase Building Materials Mazhar Hussain, Shakeel Ahmad and Wen-Quan Tao* Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, China School of Energy & Power Engineering, Xi’an Jiaotong University, China * Correspondent author: wqtao@mail.xjtu.edu.cn Keywords: Lattice Boltzmann method, RGMMP, Effective thermal conductivity, Building materials.
They observed that the results for wet materials were closer to the experimental data as compared to those for dry materials.
More validation of other building materials is needed.
Acknowledgment This work is supported by the 12th Five-Year National Key Technology R & D Program (2012BAJ02B03) and the Key Project of the National Natural Science Foundation of China (51136004).
Kodur, "Properties of Concrete at Elevated Temperatures," ISRN Civil Engineering, vol. 2014, p. 15, 2014

Offshore Engineering Rules: Wave and Turbine Forces in TCEC Systems Construction a floating structure of oil and gas platform generally follows the offshore engineering rules that have been established internationally.
Offshore engineering rules for oil and gas industry provide basis in deriving rules or guidelines for engineering design of the TCEC systems.
Along with this engineering analysis, cost of producingthe configuration has to be effective.
The materials for the construction of floating structure of TCEC should be suitable for the expected environmental conditions for a set of design life time.
Materials unsuitable for a marine environment may be used if protected by adequate coating or cladding.

Kuric, Basic and Advanced Materials for Fused Deposition Modeling Rapid Prototyping Technology, Manuf. and Industrial Engineering 11 (2012) 24-27
Pokorný, Influence of the Lead Angle from the Vertical Axis Milling on Effective Radiu sof the Cutter, Key Engineering Materials 581 (2014) 44-49
Onofrejova, Modelling of Production Lines for Mass Production of Sanitary Products, Procedia Engineering 96 (2014) 330-337
Panda et al., Analytical expression of T-vc dependence in standard ISO 3685 for cutting ceramic, Key Engineering Materials 480-481 (2011) 317-322
Petru et al., Surface roughness after machining and influence of feed rate on process, Key Engineering Materials 581 (2014) 341-347.

Based on the function of key parameters of cushioning package acquired, the reversed cushioning package design method is carried out.
Introduction The paper-based materials have the advantages of low price, no pollution, easy to process, and wide operating range.
Stress - Energy measurement method to obtain curve Principle: the purpose of using the method of stress – energy is concluded that the curve of cushioning materials.
Applied Mechanics and Materials, Vols.288,256-261 [2] G.M.Zhang, Y.L.Hu.
Journal of cushioning performance of honeycomb paperboard packaging engineering, 2008, 29 (10) : 77-79 [3] X.Y.Wang, H.N.Wang.

Electrospinning is an important method for preparing nanofibers, which are highly promising for applications in a wide range of fields such as purification/filtration, photoelectric devices, battery separators, catalysis and tissue engineering.
These applications often use composite materials and have specific requirements for mechanical properties.
Those composite modes include changing the interlacing of fiber thickness, multi-layer composite of different materials, etc[7-9].
Both the MSM film and the MNSSM film are completely mixed spinning of two materials.
Matsuda, Mesoscopic spatial designs of nano- and microfiber meshes for tissue-engineering matrix and scaffold based on newly devised multilayering and mixing electrospinning techniques, Biomater. 26(1) (2005) 37-46.

Light reflector materials.
engineering, silicon carbide is become the most potential material used to make space optical system reflector.
Optics and Precision Engineering, 2003, 11(6):556-558
Optics and Precision Engineering, 2003, 11(5):467-470
Infrared and Laser Engineering, 2008, 2 (1):98-100