Entity

Time filter

Source Type


Guo H.,Engineering Design Research Institute of Equipment of PLA | Lei X.,Engineering Design Research Institute of Equipment of PLA | Yang G.,Engineering Design Research Institute of Equipment of PLA | Niu Z.,China Taiyuan Satellite Launch Center
International Journal of Mining Science and Technology | Year: 2015

In order to study features of rock-water interaction, a self-developed experimental system called Intelligent Testing System for Water Absorption in Deep Soft Rocks (ITSWADSR) was utilized to analyze the hydrophilic behaviors of natural soft rock at high stress state. Combining X-ray diffraction and mercury injection test, main influencing factors on hydrophilic characteristics were studied. According to the results, it could be concluded as the following: (1) the effective porosity, and the content of illite, illite/smectite formation (S = 5%) and kaolinite have positive correlation with the water absorption capacity of rock; meanwhile, the initial moisture content, fractal dimension of effective pores, illite/smectite formation (S = 30%) and chlorite present negative correlation; (2) among the positive factors, the ascending order is kaolinite, illite/smectite formation (S = 5%) and illite; (3) the descending order among the negative factors are chlorite, illite/smectite formation (S = 30%) and fractal dimension of the effective pores; (4) influence of effective porosity on the pressurized water absorbing capacity of rock is minimal, while it is maximal in the process of no pressurized water absorption. © 2015 Published by Elsevier B.V. on behalf of China University of Mining and Technology. Source


Guo H.,Engineering Design Research Institute of Equipment of PLA | Li B.,Engineering Design Research Institute of Equipment of PLA | Wang X.,Engineering Design Research Institute of Equipment of PLA | Zhang F.,Engineering Design Research Institute of Equipment of PLA
International Journal of Mining Science and Technology | Year: 2015

Abstract A series of water absorption tests on dried soft rock have been conducted by the intelligent testing system for water absorption tests in deep soft rock, including tests of water absorption with and without pressure. The results show that the water absorbing capacity of rock with a certain pressure is larger than that of rock without pressure; however, the relationship between the water absorbing percentage and the time can be expressed by w(t) = a(1 - e-bt). In bi-logarithmic coordinates, the hydrophilic relationship with time in tests with pressure could be characterized by linearity, while they present concave or convex in tests without pressure. Based on the hypothesis that each influential factor is irrelevant and they have a linear correlation with the water absorbing capacity, we calculated the weight coefficient of each factor according to experimental results under different conditions. The calculations demonstrate that the effective porosity, content of smectite and kaolinite are all positively correlated with the water absorption capacity of rock; meanwhile, the fractal dimension of the effective pores presents a negative correlation with the water absorption capacity of rock. The water absorption capacity with pressure increases with increasing illite, chlorite and chlorite/smectite formation and a decrease in illite/smectite formation and the fractal dimension of the effective pores, while it is opposite in tests without pressure. The weight coefficient of smectite is smallest among positive factors, and the fractal dimension of the effective pores is the smallest amongst the negative factors. © 2015 Published by Elsevier B.V. on behalf of China University of Mining & Technology. Source

Discover hidden collaborations