Let's try to extract the soil or add more, put steel tendons around, or add counterweights or anchors.
Burland, Jamiolkowski, and their crew thought and tried a few ways to prevent the leaning tower of Pisa from falling. Some stopped it from leaning, some made it lean even more.
First, they tried to extract the soil from below the tower. They extract the soil through drill pipes from north, upstream side of the tower foundations, making the tower to settle to the upright direction.
The masons continued to work on the fourth story and at the belfry, but the belfry made the tower sink a few inches after the tower already sunk 10 feet into the soil, causing it to tilt about four degrees.
Is it working?
Then they tried using 18 plastic-sheathed steel tendons for the tower to stop leaning, but that didn't really do anything.
I don't think so.
Then they tried using a counterweight. They used about 600 lead ingots and stacked them on the north quarter of the tower. The counterweight worked, but it made the tower look ugly. They tried to remove it, and they almost brought the tower down.
Finally, they did soil extraction again. There were forty-one drill pipes around the north quadrant of the tower and the soil was channeled to the surface. They removed about 10 tons of soil and the tower rotated 513 arc seconds.