The analysis of comosite soil nailing support in deformation characteristics

Based on deformation monitoring records of an excavation in soft soil in Hangzhou,which was supported by composite soil nailed wall,the deformation development of excavation in soft soil was analyzed,the result indicated that the horizontal displacement with depth forms a parabolic distribution,the maximum horizontal displacement was at the lower part of the foundation;surface settlement around foundation pit was small.And the main influencing factors such as the construction sequence,supporting forms,surrounding environment were analyzed,concluding that excavation should be conducted firstly at the position where was no digging around pipelines or structures;composite soil nailing was better than pure cement mixing pile to control deformation;if the foundation pit was near to the heavily traffic road and building,it should be strengthened to strictly control the deformation.