Our strategy for Mine and Dine level 15-15 is to fire the first Yellow bird into the middle of the first stalactite, causing it to fall straight down. The collateral damage causes the left tower to fall. Fire the next Yellow bird through the both stalactites and the rope holding the boulders. All that remains is hitting the TNT in the middle with the Yellow bird. Either a direct shot or a lob shot should work. The score in the video below is 146,200.
Alternate higher scoring method by Sizeuk, scoring 166,950.