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The Research of Disaster Mechanism and Control Measures of Karst Collapse Caused by Roadbed Construction Qingguo Hua, Yong Wub and Zhongming Hec School of Traffic and Transportation Engineering, Changsha University of Science & Technology Changsha 410114, China ahuqg204@126.com, bwuyong.1178@qq.com, chezhongming45@126.com Keywords: Karst Collapse; Formation Conditions; Mechanism; Prevention Measures Abstract: Combined with practical examples of karst roadbed construction of Zhanghua highway, the article analyzes catastrophic manifestations, disaster causes and common prevention measures of karst collapse caused by roadbed construction; according to research putting forward the corresponding treatment program on engineering examples, engineering practice to good effect, showing that the proposed scheme of karst treatment is reasonable and reliable, referencing for similar projects.
Blocking method is the use of different materials to blockage shafts, sinkholes etc.
Acknowledgements This project obtained the funding of the general project of Hunan science and technology plan （2014FJ3067）and Guangxi scientific research and technological development projects(Gui branch turn 1298011-2).
Analysis of of diseases of anhydrite karst roadbed of Qinghai-Tibet Railway[J].Journal of Chinese Geological Hazards and Control .2008(01)
Analysis of disease management of highway roadbed karst[J].Chengdu University Journal(Natural Science).2012(03)

., Seoul National University of Science &Technology, Seoul, Korea acysoo@lh.or.kr, bkkch@seoultech.ac.kr(corresponding auther) Keywords: Damage Detection, First natural frequency and mode shape, Cantilever-type structure Abstract.
Introduction Structural damage may occur due to many reasons such as cracks, deteriorated materials, etc.
Acknowledgment This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (2010-0025200).
Journal of the Struct.
Journal of the Engrg.

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Materials and research methods Experimental works have been performed at Concept M3 linear selective laser melting (SLM) machine.
Practice of application of this material in SLM process shows that Cobalt-Chromium alloy has maximum heat resistance, relatively low environment inertness and good melting properties comparing with other used materials (titanium, aluminium alloys, maraging steel etc.).
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Introduction As the plastically deformed sheet metals form a broad range of products throughout the world, such as automobile components, submarine hulls, aircraft frames, and construction materials, sheet metal forming is becoming one of the most common manufacturing processes.
In our simulations, the flow curve of the examined materials HC340LAD with a thickness 1.0 mm was gained by putting the strength coefficient K, and strain hardening coefficient n, in the power law σ=K(ε+ε0)n by experimental works.
Cao, On the predication of side-wall wrinkling in sheet metal forming process, International Journal of Mechanical Science 42 (2000) 2369-2394
Arnold, Buckling limit diagrams (BLDs) of interstitial free steels (IFS): Comparison of experimental and finite element analysis, Journal of materials Processing Technology 164-165 (2005) 1487-1494
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Research Methodology and Materials Used For the purposes of this investigation, Portland cement CEM I 42.5 R, according to EN 197-1, produced by JSC Akmenės Cementas was used.
Materials Science (Medžiagotyra) 11(2): 150–158
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“Some Influences on the Thixotropy of Composite Slag Portland Cement Suspensions with Secondary Industrial Waste,” Construction and Building Materials, V. 21, No. 7, July, pp. 1520–1527

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Very often, material and heat-treatment requirements are also predefined parameters.
This depends on the gear tooth manufacturing accuracy – i.e. lead, profile and spacing, additional material heat-treatment, type of lubrication, etc.
The pinion and the wheel typically have different tooth shapes and facewidths, are made of different materials and have different heat treatments, etc.
The gear material was steel 17CrNiMo7, with mechanical characteristics taken from the literature [21] and given in Table 1.
Subić, Analysis of the nominal load effects on gear load capacity using the finite element method, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 224(11) (2010) 2539-2548

The environmentally friendly polymer electrolyte is required to decrease the risk of environmental pollution caused by toxic materials of battery components.
These three main materials were dissolved in an appropriate solvent and mixture until homogenous.
Currently, batteries represent a large volume of toxic and hazardous material in common use, and these materials must be managed throughout their life cycle to avoid harm to environment and human health.
Experimental Preparation of Materials Hydrolysis of PHB.
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Fig.1 The calculation model of a dwelling room Walls of different configurations are made of the materials as table 1.
Table 1 Materials used in the calculating model Material number Material Thermal conductivity Density Specific heat 1 KP1 sintered porous brick 0.58 1400 1050 2 B05 Sand aerated concrete block 0.13 500 400 3 Reinforced concrete 1.74 2500 920 4 Extruded polystyrene board 0.03 28 1380 Four configurations are calculated with the materials.
Acknowledgments This work is supported by the "Twelfth Five-Year " national science and technology support program(2012BAJ12B02).
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