Abstract: This paper presents a case history of ground improvement for Shanxi Coalbed Methane Central Processing Center’s foundations. Based on the site topographic mapping, geological mapping, geotechnical boring program, test pits, insitu tests, and geotechnical sampling results, the site engineering geological and hydrogeological conditions were characterized. An isotopic homogeneous ground deformation model was proposed to predict to site settlement and mitigation plan was also proposed. The results show that the backfill soil layer was unevenly distributed, the degree of compaction criteria were not reached, the void ratios are relatively high and the external drainage system at the site was not functional. The backfill soil softening, and the hydrocompaction induced by the surface water seepage were the main factors causing the settlement and deformation of the backfill soils. The contribution of the underlying loess layer was not significant. Based on the static analysis of the isotropic homogeneous linear deformation body theory, it is concluded that the current settlement within the project area is still ongoing, and the settlement has not stabilized yet, which requires comprehensive engineering treatment.

Key words: foundation soils, isotropic homogeneous linear deformation body, settlement, prediction analysis