The Background

Soil Types: Fill soil、collapsible loess、total of 5 buildings experiencing settlement.

Building height: 25 m

Maximum settlement:120 mm

Maximum inclination rate: 9 ‰ towards the south

The Problem

Collapsible loess is a special soil; during the initial construction phase, the SDDC method was used to mitigate its impact on the foundation, but the fill soil above was not properly treated. After the residential buildings were completed, the average pressure at the base reached 155 kPa,leading to insufficient bearing capacity of the shallow fill foundation and uneven settlement.

The Solution

Special materials are used to fill and compact the soil, forming a raft-shaped composite foundation when solidified together, enhancing foundation stability and bearing capacity. This process generates an upward lifting force, thereby achieving building lifting and rectification.

The Result

Construction period:25 days

Total lift amount:120  mm

Inclination deviation:0.3‰