Based on an example of a project in Tangshan, the high-rise buildings are\nbuilt in karst area and mined out affected area which is treated by high pressure\ngrouting, and foundation is adopted the form of pile raft foundation. By\nlong-term measured settlement of high-rise buildings, It is found that foundation\nsettlement is linear increase with the increase of load before the building\nis roof-sealed, and the settlement increases slowly after the building is\nroof-sealed, and the curve tends to converge, and the foundation consolidation\nis completed. The settlement of the foundation is about 80% - 84% of the\ntotal settlement before the building is roof-sealed. Three layer BP neural network\nmodel is used to predict the settlement in the karst area and mined affected\narea. Compared with the measured data, the relative difference of the\nprediction is 0.91% - 2.08% in the karst area, and is 0.95% - 2.11% in mined\naffected area. The prediction results of high precision can meet the engineering\nrequirements.
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