关键词: 地基沉降, 地基承载力, 微型桩

Abstract: The characteristics of collapsible loess in northwest China often induce the phenomenon of the foundation subsidence after the completion of the projects. It is of the great practical significance to deal with such hazards on time. This paper presents a case history of the ground improvement work for an alumina factory reconstruction project. The causes of differential settlement of the sediment tank system were analyzed. The geotechnical properties of the site and the bearing capacity of the foundation soil were identified through the supplementary geotechnical engineering investigation. The design problems and defects existing in the foundation treatment of the original lime soil cushion were reviewed. The reliability of the foundation treatment strengthened by micropiles was demonstrated in accordance with the design principle of “settlement reduction pile”; In addition, according to the construction specifications and engineering experience, construction details and corresponding parameters in the construction process of micropile were provided. It showed that reinforcing of the existing foundation with micropile can effectively mitigate the differential settlement issues of sediment tank foundation.

Key words: Foundation Settlement, Foundation Bearing Capacity, Micropiles