Determining transmissivity of fracture sets with statistical significance using single-borehole hydraulic tests: Methodology and implementation at Heshe well site in central Taiwan

摘要: Abstract This work develops a novel method for determining the transmissivity of fracture sets with statistical significance and validates by performing in situ hydrogeological tests. An ideal mechanistic model is firstly considered, which injection discharge single-borehole hydraulic test sum flow water through intact rock that fractures. The assumes fractures similar attitudes have mutually consistent properties law mass conservation applies tests, facilitating analysis. To validate proposed demonstrate its practical implementation, an experimental well site designed using discrete network concept information about spatial distribution at site. Ten wells within 10 m each other are drilled to perform 59 groups tests specific locations where distinct observed wells. A deviation more than three orders magnitude measured equivalent conductivity among reveals dominate characteristics study Therefore, dominant set statistically determined method, deviated from their mean identified. Most statistics evaluated confidence level greater 95%, indicating can be inferred high confidence. efficacy fractured masses thus verified, so used effectively describe DFN model.