APPLICATION OF RIGID LARGE-DIAMETER CEMENT-SOIL MIXING PILE SUPPORT TECHNOLOGY IN A DEEP FOUNDATION PIT PROJECT

With the construction of a large amount of infrastructure in China, the support of deep foundation pit projects has become the main factor restricting the cost and construction period of the project. This paper takes a foundation pit project in the eastern region as the research object. Based on a detailed geological survey, this study adopts rigid large-diameter cement-soil mixing pile support technology to complete the engineering design and construction, and obtain the level of the foundation pit top, the vertical displacement, and the settlement of adjacent buildings through on-site foundation pit monitoring, and finally analyze the monitoring results to grasp the overall stability and safety status of the foundation pit. Research shows that when the excavation of the foundation pit reaches the design elevation, the newly excavated area still has some displacement temporarily, and the deformation of the remaining area is not large. The north side of the foundation pit is close to the adjacent road. The pit bottom should be hardened as soon as possible after the excavation of the foundation pit to reduce the impact of foundation pit construction on adjacent roads. The horizontal displacement and settlement of each position of the foundation pit are within the design alarm value and design control value, and the foundation pit is relatively stable. The research results verify the rationality of the support technology and the scientificity of the construction method, and provide effective reference data for the support of similar deep foundation pit projects.