China Built a 13-Story Apartment Block — Then It Fell Over in One Piece
November 2, 2026 · 16 min
At 5:30 in the morning on June 27, 2009, Building 7 of the Lotus Riverside complex in Shanghai’s Minhang District fell over. The finished 13-story apartment block did not crumble. It landed flat on its side, largely in one piece, with straight balconies and many windows still unbroken.
This video explains why the tower survived the fall, and why that fact points away from the building and down into the ground. The cause was not an earthquake, a sinkhole or bad concrete. It was a chain of construction decisions that pushed the soil out from under the foundation.
A building too strong to shatter
Concrete is brittle, and a falling tower usually ends up as rubble. Building 7 rotated about 90 degrees and stopped, its frame intact. That showed the shear walls, slabs and joints above ground were well built. Whatever failed was below them.
Shanghai’s soft ground and PHC piles
Shanghai sits on the Yangtze River Delta, on deep layers of wet silt, sand and compressible clay. Buildings there stand on piles. Building 7 used 118 PHC (prestressed high-strength concrete) pipe piles, hollow concrete tubes driven roughly 33 meters into the clay and held up by skin friction. They carry huge vertical loads, but they are weak against force from the side.
The construction sequence
- The tower was finished first, with interior work already underway.
- Only then did contractors dig a 4.6-meter pit on its south side for an underground garage.
- To avoid the cost and delay of hauling soil away, the excavated dirt was piled on the north side into a mound about 10 meters high.
The soil pressure trap
Wet Shanghai clay weighs roughly 1.8 to 2 tons per cubic meter, so the mound added tens of thousands of tons on one side while the pit removed support on the other. Then the plum rain season soaked the site. The rain made the mound heavier and raised pore water pressure in the clay, cutting its strength. The soft clay began sliding sideways toward the pit.
How the foundation failed
The moving soil pushed on the middle of the piles while their tops and bottoms stayed fixed. The hollow tubes snapped one after another as load shifted to their neighbors. With the south side unsupported, the rigid tower pivoted on its broken base and fell onto the site.
The aftermath
One worker, a 28-year-old from Anhui province, was killed. Nearly every apartment had been sold, but no one had moved in yet. The official report found the piles met quality requirements; the failure was one of process. In early 2010, six people from the developer, contractors and site supervision were sentenced to three to five years in prison. The fallen tower had to be broken up where it lay, and rules on stockpiling soil near foundation pits and existing buildings were tightened.
Key takeaways
- Building 7 fell intact because its frame was strong. The ground under it failed.
- Digging a garage pit after the tower was built removed support on one side.
- A 10-meter pile of excavated soil on the other side, soaked by rain, pushed the clay sideways.
- Hollow PHC piles hold vertical loads well but snap under lateral force.
- Saving money on hauling dirt ended up costing a whole building and a life.
More from the channel: @ChinaUnderStress