Liu Yu, Li Shuncai
School of Mechanical and Electrical Engineering, Jiangsu Normal University, Xuzhou, 221116 Jiangsu China ; School of Mines, China University of Mining and Technology, Xuzhou, China.
School of Mechanical and Electrical Engineering, Jiangsu Normal University, Xuzhou, 221116 Jiangsu China.
Springerplus. 2016 Dec 20;5(1):2099. doi: 10.1186/s40064-016-3778-9. eCollection 2016.
Surface water, groundwater and sand can flow into mine goaf through the fractured rock, which often leads to water inrush and quicksand movement. It is important to study the mechanical properties of water and sand in excavations sites under different conditions and the influencing factors of the water and sand seepage system. The viscosity of water-sand mixtures under different particle sizes, different concentration was tested based on the relationship between the shear strain rate and the surface viscosity. Using the self-designed seepage circuit, we tested permeability of water and sand in fractured rock. The results showed that (1) effective fluidity is in 10-10 m s/kg, while the non-Darcy coefficient ranges from 10 to 10 m with the change of particle size of sand; (2) effective fluidity decreases as the particle size of sand increased; (3) the non-Darcy coefficient ranges from 10 to 10 m depending on particle size and showed contrary results. Moreover, the relationship between effective fluidity and the particle size of sand is fitted by the exponential function. The relationship between the non-Darcy coefficient and the particle size of sand is also fitted by the exponential function.
地表水、地下水和泥沙可通过破碎岩石流入矿井采空区，这常常导致突水和流沙移动。研究不同条件下开挖场地中水沙的力学性质以及水沙渗流系统的影响因素具有重要意义。基于剪切应变率与表面粘度之间的关系，测试了不同粒径、不同浓度下水沙混合物的粘度。利用自行设计的渗流回路，测试了破碎岩石中水沙的渗透率。结果表明：（1）有效流动性在10 - 10 m s/kg之间，非达西系数随沙粒粒径变化在10至10 m之间；（2）有效流动性随沙粒粒径增大而减小；（3）非达西系数根据粒径在10至10 m之间变化，呈现相反结果。此外，有效流动性与沙粒粒径之间的关系由指数函数拟合。非达西系数与沙粒粒径之间的关系也由指数函数拟合。
