Research on the Mechanical Properties of New Double-Row Pile Supporting Structure Based on an In Situ Study

Table 2

Test procedure.

Property	Monitoring position	Monitoring quantity	Instrument
Pile strain	Conventional front and rear row pile	Conventional pile strain gauge: five groups + one branch	Vibrating string embedded strain gauge (BGD-4200)
	Prestressed strong-constrained front and rear row pile	Prestressed strong-constrained pile strain gauge: four groups + two branches
	Recycling assembled front row pile	Recycling assembled pile strain gauge: five groups
Horizontal displacement of pile body	Conventional front row pile	Three types of front row pile for a total of six	Clinometer
	Prestressed strong-constrained front row pile
	Recycling assembled front row pile
Horizontal displacement and vertical displacement of pile top	Conventional front and rear row pile	One of three types of front and rear piles, a total of 12 measuring points	Remote displacement automatic monitoring system, electronic total station
	Prestressed strong-constrained front and rear row pile
	Recycling assembled front and rear row pile