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Especially, the proportion of extractive industries and raw materials processing industries are far larger than other processing industries, with primary products dominant in the product structure and the development of high-tech industry relative lag, and the service industry is underdeveloped.
Science Press.
Journal of Graduate School of Chinese Academy of Social Science.

Research on Engineering Characteristics of Negative Friction Resistance for Large-diameter Caisson Pile Wei Jihong 1, a, Fu Weibin 1,b , Shang Zheng 1,c and Yue Ling 1,d 1 The College of Earth Science and Engineering, Hohai University, Nanjing, China awjhfish@hhu.edu.cn, b327278764@qq.com, c450324345@qq.com, d731506880@qq.com Keywords: negative frictional resistance; large-diameter caisson pile; generation mechanism; analytical method; mechanics characteristics Abstract.
Figure.4 Sketch of negative friction force and pull force with pile length Suppose there is a single pile in a homogeneous soft clay layer, calculation parameters of pile shaft are as follows: pile length 50m, pile diameter 0.8m, pile elastic modulus E= 2.8×107 kPa, Poisson's ratio is 0.167, the pile materials weight is 24.5kN.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (No 41102162 and 41002089) and National Key Technology R&D Program in the 11th Five year Plan of china (2008BAB29B03)).
Skin friction of large-diameter Piles socketed into rock[J].Canadian Geotechnical Journal, 34:230-240(1997) [6] Minghua Zhao.

We can make effort from the material incentive and spiritual stimulation respectively[8]
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Materials and Methods Humic acid (HA) was procured from Sinopharm Chemical Reagent Co.
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Monte Carlo Simulation Technique was observed to be the only universal approach for engineering problems involving material and geotechnical non-linearity [3].
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Dizon, Application of Taguchi Methodology in Evaluating the Rockwell Hardness of SLA 3D Printed Polymers, Materials Science Forum, ISSN: 1662-9752, Vol. 1005 (2020), pp 166-173 [3] J.R.C.
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Most houses were constructed through mass urban renewal programs in the 1990’s, but their facades turned shabby quickly because of the cheap materials used.
In 2004, the District Government invited the experts of Chinese Construction Science Institute from Beijing for advice.
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