International Journal of Ground Sediment & Water

22-31

Authors: Song Yang; Sun Wen-jun; Zhu Xiao-yun; Zhang Hai-feng

In order to provide basis for the design of flexible base durable asphalt pavement structure. The influence of all kinds of parameter combination on different control indicators was analyzed by combining the extremum of each structure-layer parameters, such as different asphalt aggregate thickness, different layer thickness under the same total thickness, and different elasticity modulus. Regression analysis was carried out based on the data in database by the using of Minitabdata analysis software. The mechanical response model was obtained. And the influence that each structure-layer parameters acting on the mechanics index of pavement structure were measured. The research shows that the total thickness of asphalt layer is the key influence parameter of tensile strain indicator of asphalt layer bottom. The flexible base layer thickness is the main influence parameters of top soil base compression strain index. The flexible subbase modulus parameter has influence on every index obviously. Soil base modulus is the main influence parameter of surfacing deflection and the top soil base compressive strain index. © International Journal of Ground Sediment & Water, @ Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/

41-51

Authors: Zhang Mei; Meng Da

Based on the NATM, established the mechanical model of the mining surface structures, researched the forming of the non-hinged arch during the coal seam mining. Using elasticity center method calculated the internal forces of the non-hinged arch, got the strength, rigidity and stability of the surrounding rock and supporting structure. With analytic calculation, Analyzed the rock stress evolution of the adjacent coal seam mining and the stress distribution of the stope roof rock evolution. Based on the stress field evolution of the stope, analyzed the force and the crack development in different regions of the rock mass, studied the distribution of the strain and shear stress in the rock mass and the impaction of mining velocity on rock stress distribution. Verified the rationality of the surface structure of the model adopted in this paper. © International Journal of Ground Sediment & Water, @ Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/