Abstract
According to the force characteristics of the double-row pile supporting structure, two new types of double-row piles are developed: the prestressed strong-constrained double-row piles and the recycling assembled double-row piles. A comparative field test was conducted on the support effects of the two new double-row piles and conventional double-row piles. The test site is located in a deep foundation pit of the Beijing Daxing International Airport Project. The feasibility and reliability of the two new support structures are verified. Field monitoring included section strain and bending moment of the pile body, horizontal displacement of the pile body, and vertical and horizontal displacement of the pile top. The research shows that because of the prestressed anchorage cables in the rear row piles, the prestressed strong-constrained support structure can provide better tensile performance from the rear piles, and the deformation and displacement are minimal. The recycling assembled double-row piles have similar deformation and displacement to the conventional piles. Through the connection of the steel members, the construction time can be effectively shortened. After the backfill of the foundation pit, the steel members can be recycled and the cost can be reduced.
Highlights
Double-row pile support structures are widely used in slope engineering, hydraulic engineering, road engineering, and other fields. is type of support structure mainly consists of front row piles, rear row piles, crown top beams, and coupling beams [1, 2]
Nie et al [8] used a combination of model tests, numerical simulations, and field tests to systematically study the distribution of earth pressure, displacement of front and rear row piles, and bending moments of the front and rear rows of double-row piles in a foundation pit excavation
E front row pile of the prestressed strong-constrained pile appears as negative values in the early stage of monitoring, where the maximum displacement reaches −1.82 mm. e prestressed strong-constrained front row piles showed a negative value in the initial period of monitoring, and the maximum displacement reached −1.82 mm. at is to say, displacement of the pile top produces a deviation from the side of the foundation pit relative to the initial value, and as the excavation depth increases, the displacement gradually changes from a negative value to a positive value and increases continuously
Summary
Double-row pile support structures are widely used in slope engineering, hydraulic engineering, road engineering, and other fields. is type of support structure mainly consists of front row piles, rear row piles, crown top beams, and coupling beams [1, 2]. Is type of support structure mainly consists of front row piles, rear row piles, crown top beams, and coupling beams [1, 2]. It can be regarded as the case where the total number of piles does not change, and a single row of piles is transferred to the rear row to form parallel front and rear rows. Erefore, based on the deficiencies of the above traditional double-row piles, according to the force characteristics of the double-row pile support structure, two new types of double-row pile support structures were developed in this study and field-tested: the prestressed strongconstrained double-row piles and the recycling assembled double-row piles. A comparative test was conducted with traditional double-row piles to verify the feasibility and reliability of the new support structures
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