Investigation of the Axial Force Compensation and Deformation Control Effect of Servo Steel Struts in a Deep Foundation Pit Excavation in Soft Clay

Table 1

Construction operation of the foundation pit.

Stage	Construction operation	Date
1	Preparation of Pit A, installation of 1^st concrete strut	2017/04/26–2017/05/22
	Preparation of Pit B, installation of 1^st concrete strut	2018/12/01–2019/12/24
2	Excavation of Pit A to 5.0 m, installation of 2^nd steel strut	2017/05/22–2017/06/18
	Excavation of Pit B to 5.0 m, installation of 2^nd steel strut	2018/12/24–2019/01/05
3	Excavation of Pit A to 8.0 m, installation of 3^rd steel strut	2017/06/18–2017/07/05
	Excavation of Pit B to 8.0 m, installation of 3^rd steel strut	2019/01/05–2019/01/13
4	Excavation of Pit A to 11.5 m, installation of 4^th steel strut	2017/07/08–2017/07/16
	Excavation of Pit B to 11.5 m, installation of 4^th steel strut	2019/01/13–2019/01/18
5	Excavation of Pit A to 15.0 m, installation of 5^th concrete strut	2017/07/16–2017/08/15
	Excavation of Pit B to 15.0 m, installation of 5^th concrete strut	2019/01/18–2019/02/23
6	Excavation of Pit A to 18.5 m, installation of 6^th steel strut	2017/07/26–2017/10/02
	Excavation of Pit B to 18.5 m, installation of 6^th steel strut	2019/02/23–2019/03/11
7	Excavation of Pit A to 21.5 m, installation of 7^th steel strut	2017/08/08–2017/10/15
	Excavation of Pit B to 21.5 m, installation of 7^th steel strut	2019/03/11–2019/04/01
8	Excavation of Pit A to 24.5 m, pouring of bottom slab	2017/09/01–2017/10/30
	Excavation of Pit B to 24.5 m, pouring of bottom slab	2019/04/01–2019/04/20