Design & practice on engineering projects of specially deep & big excavation in Shanghai

This paper briefly describes two engineering projects of specially deep and big excavation,Jin Mao Mansion and Heng Long Square with depth of 19.65m and 18.20m, and area of about 20 000m 2 and 25 000m 2, respectively. Based on the comparison of design, construction and monitoring between these two projects,a design idea on specially deep and big excavation is presented.