To make matters worse, the groundwater level under the foundation is also very shallow, and the depth is only about 1 meter. The latest geological exploration found that the bell tower is located on the ancient coastline, that is to say, the foundation soil has been desertified when it was built. As a result, the leaning tower of Pisa, a "big guy", is doomed to uneven settlement and inclination soon after its completion.
The leaning tower of Pisa tilted during its construction. It was originally an architectural failure, but it has become a world architectural miracle. Galileo's free fall experiment made it famous in the world, becoming a world-famous tourist attraction, attracting thousands of tourists every day, so it is also the economic pillar of Pisa.
However, with the passage of time, the inclined angle of the leaning tower gradually increased, and by the 1990 s, it was on the verge of collapse. 1990 65438+1On October 7th, the Italian government closed its doors to tourists, 1992 set up the Leaning Tower of Pisa Rescue Committee to solicit solutions from the world.
Extended data:
The reason why the leaning tower of Pisa leans but doesn't fall.
Although the inclination of the leaning tower of Pisa in Italy is 5 degrees, this 58-meter-high leaning tower has experienced at least four major earthquakes since 1280.
After studying its characteristics and architectural phenomena, scientists discovered the secret that the leaning tower of Pisa has been stable for many years. The stability of the leaning tower can be explained by the dynamic interaction between the building and the ground. Researchers believe that the height and hardness of the tower interact with the ground where its base is located. In view of this, the leaning tower will not vibrate with the ground during the earthquake.
Mirona Keith, a professor at the University of Bristol in the United Kingdom, pointed out: "Ironically, it was the soil that forced the tower to tilt that helped the tower survive the earthquake."
References:
Baidu encyclopedia-leaning tower of Pisa
People's Network-Why has the Leaning Tower of Pisa not fallen down for many years?