Abstract The permeability of a fractured rock mass is a key parameter for evaluating the water-sealing effect of water curtain systems in underground water-sealed storage caverns. As fractured rock masses always exists under the conditions of stress and seepage fields, it is important to study the effects of the geostress of underground water-sealed storage caverns on the permeability of fractured rock masses. Using the Huangdao underground water-sealed storage cavern as an example, this paper presents the basic law of seepage flow in a fractured rock mass and the influence mechanism of stress on the seepage effect. The geostress and permeability parameters of a rock mass in the studied area and their distribution rules with an increase of hole depth are obtained by hydraulic fracturing and pump-in tests, and a relational expression of the geostress and permeability coefficient is established by a regression analysis. The results show that the permeability coefficient decreases with an increase of geostress and presents a negative exponential law. Consequently, the main causes for the negative exponent relationship between the permeability coefficient and geostress are analyzed.
Abstract：
The permeability of a fractured rock mass is a key parameter for evaluating the water-sealing effect of water curtain systems in underground water-sealed storage caverns. As fractured rock masses always exists under the conditions of stress and seepage fields, it is important to study the effects of the geostress of underground water-sealed storage caverns on the permeability of fractured rock masses. Using the Huangdao underground water-sealed storage cavern as an example, this paper presents the basic law of seepage flow in a fractured rock mass and the influence mechanism of stress on the seepage effect. The geostress and permeability parameters of a rock mass in the studied area and their distribution rules with an increase of hole depth are obtained by hydraulic fracturing and pump-in tests, and a relational expression of the geostress and permeability coefficient is established by a regression analysis. The results show that the permeability coefficient decreases with an increase of geostress and presents a negative exponential law. Consequently, the main causes for the negative exponent relationship between the permeability coefficient and geostress are analyzed.
.Effect of Geostress on the Permeability of a Fractured Rock Mass in the Huangdao Underground Water-Sealed Storage Cavern[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(2): 72-77
2015, Vol. 52 