Abstract
Blasting impact load may be encountered during the construction of some pile foundation projects. Due to the effect of blasting impact, hole collapse can easily occur in the hole-forming stage of pile foundation construction. In order to prevent hole collapse, it is very necessary to evaluate the stability of a pile hole wall before pile foundation construction. The calculation of hole collapse can usually be attributed to an axisymmetric circular hole stress concentration problem. However, the existing collapse failure theory of pile hole hardly considers the effect of blasting impact load. In view of this, this paper proposes the stability evaluation method of a pile hole wall under blasting impact. Compared with the existing collapse failure theory, the proposed method fully considers the effect of blasting impact stress. Using Mohr–Coulomb strength theory and symmetry analysis, the strength condition of collapse failure is established in this work for accurate evaluation of the stability of a hole wall. The proposed stability evaluation method is demonstrated by a pile foundation construction project of a bridge. Moreover, a shaking table test on the pile hole model was performed to verify the proposed method by experimental data. The results indicate the effectiveness and usability of the proposed method. The proposed method provides a feasible way for the stability analysis of a pile hole wall under blasting impact.
Highlights
Academic Editor: Natalie BaddourBored pile is a common foundation form in building and bridge structures [1,2,3,4,5,6]
Using Mohr–Coulomb strength theory and symmetry analysis, the strength condition of collapse failure was established in this work for accurate evaluation of the stability of a hole wall
According to Mohr–Coulomb strength theory, the strength conwhere σz can be seen as the stress that causes hole collapse, and [σ ] can be seen as the dition of collapse failure can be expressed as allowable stress
Summary
Bored pile is a common foundation form in building and bridge structures [1,2,3,4,5,6]. Yang [27] discussed the effects of borehole diameter, borehole depth, and mud bulk density on borehole wall collapse under static loads He proposed a theoretical evaluation model of hole wall collapse by considering the weight of different influencing factors. Considering the effect of intermediate principle stress, Gong and Zhao [28] deduced the solutions of critical mud density and initial plastic depths of borehole for collapse and the contraction problem on the hole of bored pile. The existing collapse failure theory of pile hole hardly considers the effect of blasting impact load. Due to the effect of blasting impact, hole collapse is more occurs in the hole-forming stage of pile foundation construction. Compared with the existing collapse failure theory, the proposed method fully considers the effect of blasting impact stress. The proposed method provides a feasible way for a stability analysis of a pile hole wall under blasting impact
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