Characterizing Structural Bearing Capacity and Deformation Behaviors of Micropiles under Multi-Stage Static Loading

Xueyuan Zhang; Luqiang Ding; Chengzhi XiaoYang Song

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Characterizing Structural Bearing Capacity and Deformation Behaviors of Micropiles under Multi-Stage Static Loading

机译：Characterizing Structural Bearing Capacity and Deformation Behaviors of Micropiles under Multi-Stage Static Loading

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This study investigates the structural bearing capacity and deformation behaviors of micropiles considering various influence factors including the length (L) of micropiles, outer diameter (d) and wall thickness (t) of steel pipes, diameter (r) and spacing (s) of grouting holes, and water cement ratio (w/c) of grout. Multi-stage axial compressive tests were performed on 20 micropiles to obtain their deformation behavior and axial compressive loads respectively corresponding to the cracking of surrounding grout (P_(cr)), yielding of steel pipes (P_y), and global structural failure (P_(ult)). Experimental results reveal that Pcr and Py are respectively 0.20 - 0.45 and 0.85 - 0.95 times P_(u). In general, P_(ult) decreases with L. Increasing d produces a more significant improvement in P_(ult) compared to increasing t. The influences of r and s on P_(ult) are associated with the weakening of stiffness and strength of the steel pipes. Micropiles with various w/c levels perform similar P_(ult) whereas their axial displacement at P_(ult) increases with w/ c. Under the same L or w/c condition, increasing d leads to an obvious reduction in the axial displacement at P_(ult). In the existing criteria, the performance of prediction equations for P_(ult) and allowable axial compression load (P_c) was compared and evaluated. Furthermore, several empirical models were proposed to respectively predict P_(ult) and P_c of the micropiles considering the influences of L, d, t, r, s, and w/c and achieve well predictions.

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《KSCE journal of civil engineering》 |2023年第3期|992-1009|共18页
作者
Xueyuan Zhang; Luqiang Ding; Chengzhi XiaoYang Song;
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作者单位

School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China,School of Architecture and Civil Engineering, Qiqihar University, Qiqihar, Heilongjiang 161006, China;

School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;

Dept. of Transportation Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China,Hebei Key Laboratory of Ceotechnical Engineering Safety and Deformation Control, Cangzhou, Hebei 061001, China;

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正文语种英语
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Micropiles; Structural bearing capacity; Deformation; Geometric parameters; Water cement ratio; Prediction models;

Characterizing Structural Bearing Capacity and Deformation Behaviors of Micropiles under Multi-Stage Static Loading

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