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(3) Heat aging of SBR-Bitumen blends and copolymers The modified materials of SBR-Bitumen blends and copolymers were heat-aged in an oven at 163℃ for 5 hours and 15 mins
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Basic principle and applicability of residual thrust method Residual thrust method is one of the rigid body limit equilibrium analysis methods, currently this method is mainly applied to the slope stability calculation of those with slide surface as a line, and it is based on the following assumptions: ①　 The landslide stability problem is treated as a plane strain problem; ②　 Sliding power is concentrated on sliding surface, with shear stress parallel to the slide surface and direct stress perpendicular to the sliding surface; ③　 Treat the landslide as a kind of ideal rigid plastic material, once slide, landslide gets shear deformation along the sliding surface.
Still existing problems and improvement 3.1 Advantages of residual thrust method Residual thrust method is so far one of the most important methods of slope stability evaluation, for several other stability calculation methods of limit equilibrium theories, line slip surface method applies only to the calculation of slopes filled with deep water materials; Sweden slice method applied to homogeneous clayey soil, because it does not consider soil on either side of the force, so results are somewhat insecure; formula method applies to homogeneous clayey soil, with fewer segmental arcs, it simply add numerical integration work on the basis of Sweden slice method, so the results of the calculation is very close to those of Sweden slice method, and security; Simplified Bishop method is also applicable to homogeneous clayey soil, considering the thrust makes the force more reasonable and calculation results closer to the actual; Spencer assumes that direction angle of slides consistent, its
References [1] Guangyu Xu, Fuchen Liu and Wei Zhang, in: Study on Calculation Method for Slope Stability of Polygonal Line ( In Chinese), Port Engineering Technology, Issue 191th.( 2009) [2] Dayong Zhu, Qihu Qian, Zaosheng Zhou and Hongtai Zheng, in: Critical Slipfield of Slope Based on The Assumption of Unbalanced Thrust Method ( In Chinese) [J], Chinese Journal of Rock Mechanics and Engineering. 1999-06:667~670 [3] Guifang Zhao, Qianyuan Yao, in: Using Residual Thrust Method to Appraise Stability of Landslide ( In Chinese), Hubei Geology & Mineral Resources, 2002,16(3):76-77 [4] Zhaohu Wang, Shengxie Xiao and Wenfang Liu, in: Comparison of analytical methods for slope stability ( In Chinese) [J], Journal of Chongqing Jiaotong University.(2005) [5] Lijuan Luo, Fasuo Zhao and Zhiyong Cai, in: Slope stability analysis based residual thrust method and complex optimization ( In Chinese), Journal of Chang an University(Natural Science Edition).(2009) [6] Mingzhu Qi, in: Application of
imbalance thrust force method in the remedy of landslide ( In Chinese), The Chinese Journal of Geological Hazard and Control.(2011) [7] Qihua Zhang, Rongsheng Peng, and Jianyu Luo, in: Residual Thrust Method Considering Moment Equilibrium and its Application ( In Chinese), Journal of Yangtze River Scientific Research Institute.(2008) [8] Chaoyang Hu, in: Research on Residual Thrust Method for Landslide Stability Analysis Under Seepage ( In Chinese), Science & Technology Association Forum.( 2011) [9] Weiwei Ji, in: Slope Stability Analysis by Imbalance Thrust Force Method ( In Chinese), Journal of Heilongjiang Hydraulic Engineering College. (2006) [10] Qing Xu, Shijun Chen and Shenghong Chen, in: Study on the improved residual thrust method for landslide stability analysis ( In Chinese), Rock and Soil Mechanics.(2005) [11] Xianqi Luo, Qinghui Jiang, Xiurun Ge and Sifeng Liu,in: Study of the Stability of Shi Liu Shu Bao Slope in Huang La Shi Slope Group ( In Chinese) [J], Chinese Journal

Acknowledgements This work is supported by National Natural Science Foundation of China (No.50805114).
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According to the type of material and processing methods, additive manufacturing can be divided into metals forming, non-metallic forming, biological materials forming and so on.
EBF3 technology can not only directly mold aluminum, nickel, titanium or stainless steel and other metal materials, but also can mix together two materials or embed one material in another.
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Then, we performed systematic theoretical and experimental researches in aspects of structure design, construction technology and equipment, material science, engineering application and so on.
Acknowledgements This work was financially supported by the Fundamental Research Funds for the Central Universities (201021200038), the National Natural Science Foundation of China (50908236), the Research Fund for the Doctoral Program of Higher Education of China (200916210038), the Hunan Provincial Natural Science Foundation of China (09JJ4022), the Foundation of the Science and Technology of China Ministry of Railway (2008G031-17-1), Special Foundation of China Postdoctoral Science (201003521) References [1] Huawu He.
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In fact, rock of low water content is brittleness and rock of high water content is plastic because rock materials could be softened by water.
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