Design and Field Monitoring of a Pile–Anchor–Brace Supporting System in a Soft Soil Area

With the continuous development of urbanization and rapid science technology, requirements for foundation pit engineering are getting higher higher. Foundation is gradually developing in direction larger area deeper excavation. In examples, combined supporting structure a pile–brace pile–anchor pits widely used, while examples supported by pile–anchor–brace system less frequently used. Based on super-large deep project Yancheng City, Jiangsu Province, China, according to surrounding environmental conditions, support scheme, on-site construction situation, design monitoring were introduced analyzed. The results show that: (1) deformation shows an obvious spatial effect, horizontal displacement pile soil long side greater than short direction; (2) initial state, form ‘cantilever’, but later stage it changed ‘drum belly’, both brace anchor cable can limit effectively; (3) axial force develops rapidly stage, its tends be gentle after completion first construction. Through monitoring, was found that ring corner brace, which opposite brace; (4) trend two rows cables quite different. average row second cables, steep then gentle, change just opposite.