Papers by Author: Yan Zhao

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Authors: Qin Liu, Shu Cai Li, Li Ping Li, Yan Zhao, Xiao Shuai Yuan
Abstract: Liangshui Tunnel of Lanzhou-Chongqing railway and Tianpingshan Tunnel of Guiyang-Guangzhou railway are the background work. Combining the construction process mechanics of soft rock, uniaxial compressive test, Brazilian test and direct shear test under different material proportion are carried out. After comparing and analyzing the basic physical and mechanical parameters of original rock and model materials, the similar materials for soft rock tunnel are attained. The effect of component proportion on material properties is analyzed. These results provide reliable material guarantee for model test of construction process mechanics in soft rock tunnels.
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Authors: Qin Liu, Shu Cai Li, Li Ping Li, Ning Zhang, Yan Zhao
Abstract: The uniform design is a new design method for investigating the experiment with many factors and levels, which can get enough experiment information with less experiment times. The advantages of uniform design are introduced in the paper, it can seek experimental points to be uniformly scattered in the experimental domain, which reduce experiment times greatly and get good experiment results. The new polymeric grouting experiment is designed by uniform design and the experiment data has been studied by regression analysis. It is proved that distinct influencing factor on grout diffusion radius are grouting pressure and permeability, but the influences of grouting time and grout temperature are smaller, their relation has been obtained through regression analysis, uniform design is efficient and credible method of experimental design by the experiment results.
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