You can also rip it. Not as much fun, but easier to deal with.
Years ago, we had a contractor use a D-10 to excavate about 25,000 CY of unfractured basalt for a 2.5 million gallon reclaimed water tank in Southern California. The magic was a single ripper tooth on a hydraulic ram mounted to the back of the D-10. The ripper tooth was about 6" wide and the "point" had probably a 1/2" radius. The D-10 did the ripping and a D-9 moved the ripped material.
It worked like this....Stop the D-10 at an appropriate location; lower the ripper tooth until it contacts the rock; keep pushing with the ram until the ripper tooth lifts the back of the D-10 about 12"-18" in the air; wait maybe a minute or so until the weight of the D-10 forces the tooth into the rock and the D-10 settles back down on its tracks; then forward with 750 hp (?) to rip a furrow. Turn around and line up about 3' from the previous furrow, rinse and repeat. Over and over again. IIRC, a fully loaded D-10 weighs somewhere in the neighborhood of 90 tons.
One day I visited the site to check on the project. All work was stopped and our inspector was sitting there bored. I asked him what the situation was. He said "I'll show you" and walked me to the back of the D-10. The hydraulic ram was attached to the back of the D-10 with a 1-1/2" thick steel plate. Two weeks worth of cyclical stressing had torn the steel like it was a phone book.
BTW, the contract was set up for blasting, and I think the estimate for everything was about $350,000. This contractor was the only one to propose ripping. His bid was about 25% below our estimate and the 2nd low was only about 5% below. When he was done, he told our project manager that even with leaving so much on the table, he had made more money than he had planned.
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