A comprehensive study on damage prediction of pile foundations of inclined high rise buildings and the effect of compaction grouting

The construction of high-rise buildings in complex soft soil layers is highly prone to uneven settlement of the foundation, which in turn induces building tilting. In severe cases, it can lead to overall collapse accidents. Due to its advantages of causing less damage to the main structure and having a smaller impact on the surrounding environment, compaction grouting is widely used in the inclined high-rise buildings' deviation correction projects. However, the construction mainly relies on engineering experience and lacks guiding research results based on numerical simulation methods. Therefore, based on the grouting repair project of a certain inclined high-rise building in Zhangzhou, Fujian Province, this study has developed a numerical simulation method for scientific prediction. The following conclusions are drawn: (1) The simulation results indicate that the building settlement's reasons may be inadequate pile embedment depth or a large thickness of the weak soil layer, etc. And the best grouting scheme was selected based on the simulation results. (2) The monitoring data after grouting show that the settlement values of most measurement points meet the control requirements. The maximum inclination rate of the building was reduced from the original 3‰ to 0.07‰, verifying the feasibility of the scheme. (3) By comparing the simulation data with the monitoring data, the maximum settlement error after grouting is only 3.1 mm and the inclination rate of both is about 1‰. The reliability of the simulation method was verified.