Abstract
Based on the geological and hydrogeological conditions of the Jurong Pumped Storage Hydroelectric Power Station (JPSHP), a 3D groundwater flow model was developed in the power station area, which took into account the heterogeneity and anisotropy of fractured rocks. A control inversion method for fractured rock structural planes was proposed, where larger-scale fractures were used as water-conducting media and the relatively intact rock matrix was used as water-storage media. A statistical method was used to obtain the geometric parameter values of the structural planes, so as to obtain the hydraulic conductivity tensor of the fractured rocks. Combining the impermeable drainage systems of the upper storage reservoir, underground powerhouse and lower storage reservoir, the 3D groundwater seepage field in the study area was predicted using the calibrated model. The leakage amounts of the upper storage reservoir, powerhouse and lower storage reservoir were 710.48 m3/d, 969.95 m3/d and 1657.55 m3/d, respectively. The leakage changes of the upper storage reservoir, powerhouse and lower storage reservoir were discussed under the partial and full failure of the anti-seepage system. The research results provide a scientific basis for the seepage control of the power station, and it is recommended to strengthen the seepage control of the upper and lower storage reservoirs and the underground powerhouse to avoid excessive leakage and affect the efficiency of the reservoir operation.
Highlights
In recent years, with the increase in water conservancy and hydropower projects, seepage problems have attracted widespread attention
Some researchers have studied the cause of the incident. They found that the presence of fractures and the permeability of the rock mass eventually led to the collapse of the Malpasset dam, which reflects the necessity of paying attention to fractures when conducting seepage control in water conservancy and hydropower projects [1,2]
The hydraulic conductivity or hydraulic conductivity tensor of a fractured rock is an important hydrogeological parameter when studying the movement of groundwater in a rock mass [3]
Summary
With the increase in water conservancy and hydropower projects, seepage problems have attracted widespread attention. When there are problems with seepage control, the efficiency of the project can be affected and even cause safety and stability problems such as landslides, submersion and permeability failure. An example of this is the famous French Malpasset dam failure. Some researchers have studied the cause of the incident They found that the presence of fractures and the permeability of the rock mass eventually led to the collapse of the Malpasset dam, which reflects the necessity of paying attention to fractures when conducting seepage control in water conservancy and hydropower projects [1,2]. The hydraulic conductivity or hydraulic conductivity tensor of a fractured rock is an important hydrogeological parameter when studying the movement of groundwater in a rock mass [3]
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