Figure 3
The horizontal axis of the scatter plot is labeled “Rebound strength (Megapascal)” and ranges from 25 to 60, in increments of 5 units. The vertical axis is labeled “Compressive strength (Megapascal)” and ranges from 20 to 80, in increments of 10 units. The plot contains multiple blue open circles scattered across the graph area. A red trend line passes diagonally through the points, sloping upward from left to right. The line starts at (29, 36.7), passes through (39.5, 44.3), (48.3, 50.6), (53.9, 54.4) and ends at (60, 58.1). Note: All numerical values are approximated.Diagram of the relationship between the core drilling method and the rebound method for testing the strength of tunnel linings. Source(s): Author’s own work