A STUDY ON MONITORING OF UP-DOWN CONSTRUCTION FOR DEEP EXCAVATION ENGINEERING

In a 238m high and 60-storey super-tall building with 10-storey podium, excavation depth of 18.95～24.00m and an area of 22 000m2 in Shanghai, based on the theoretical concept and experience, it has been analyzed that a great deal of monitoring results for horizontal displacements, heave in pit bottom, differential displacements between diaphragm wall and adjacent mid-post pile and between mid-post piles, earth pressure and stress in diaphragm wall for special deep and big excavation, and five characteristics of stress and displacement for up-down construction method differing with normal construction method have also been obtained. Some suggestions on improving the design of up-down construction method for deep excavation engineering are presented, which may be a reference for other similar projects.