Study on Rocks Permeability Rule under Whole Coupling of Liquid and Solid
(0) The effect of stress on hydro-geological conditions or permeability of water-bearing media should follow some laws or principles. Deformed and crashed rocks which were induced by geo-stress fields changing provided space for groundwater storage and flow. Groundwater adjusts water-bearing space and dilatants fractures by flowing and press transferring. This is one way of coupling of liquid and solid under large deformation or rock failure. Tests show that rock permeability attains the maximum value as rock failure, relations of permeability and strain follow logarithmic function for brittle rocks or the second power parabola function for soft rocks. On the other hand, stress changing causes only small deformation and can not make rock failure in most cases. This is another way of coupling of liquid and solid. Variety of permeability with effective stresses has relation with pore shape which includes tri-porosity media, fractured rocks, porous rocks and capillary rocks. Investigations indicate that porosity and permeability loss in fractured rocks, which are greater than that in porous rocks, porosity changes are always larger than permeability changes. Porosity or permeability is functions of effective stresses, and porosity or permeability changing rules of porous rocks with variation of effective stresses can be described as the index model, the model of power exponent functions is suitable for those of fractured rocks, the model of the second power parabola for capillary rocks.
water disaster whole coupling of liquid and solid rock failure tri-porosity media effective stress permeability porosity.
YIN Shang-xian
Mine Water Prevention and Control Institute, North China Institute of Science technology, Beijing 101601, China
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
379-383
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）