Field Experimental Study on Mechanical Properties of Frame Support Structure Composed of Subway Foundation Pit Retaining Pile and Steel Strut Rigid Joint

Table 2

Horizontal displacement values of each measuring point.

Condition		Horizontal displacement value of retaining pile (mm)
		−1 m deep measuring point		−2 m deep measuring point		−3 m deep measuring point
		Lap joint retaining pile	Rigid joint retaining pile	Lap joint retaining pile	Rigid joint retaining pile	Lap joint retaining pile	Rigid joint retaining pile
First load	Before loading	−3.77	−0.49	−35.15	−31.54	−27.96	−29.78
	After loading	−4.43	−1.38	−37.31	−33.35	−29.07	−30.80
Second load	Before loading	−4.16	−1.52	−37.96	−33.87	−29.94	−31.38
	After loading	−3.46	−2.51	−39.96	−35.60	−31.24	−32.70
Underground water pipe leakage	Before water injection	−3.28	−3.38	−41.52	−36.96	−32.56	−34.20
	After water injection	+7.18	+2.58	−44.57	−39.15	−36.84	−37.49
Total displacement increment		10.95	3.07	9.42	7.61	8.88	7.71