Influence of blasting in deep excavations on anchored pile supporting structures and its mechanism

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 144-150.

SUN Pengchang1,2,QIN Weimin2,CHEN Ming1,LU Wenbo1

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Abstract

Studying the influences and mechanisms of blasting on anchored pile supporting structures is a key issue to ensure the safety and stability of deep excavations. Relying on the deep excavations of Xiamen Airport Road Phase I, the Abaqus finite element model of the deep excavations was established. The blast vibration of the anchored pile supporting structures, the plastic damage distribution of the supporting piles, and variation of pulling force in prestressed cables were studied. The results show that the maximum blast vibration of the pile body in the adjacent blasting area is much greater than the referred blast vibration safety control standards, and there is an amplification effect of the blast vibration at the top of the pile. The blast vibration at different positions of the prestressed anchor cables is much smaller than that of the pile body, and there is no obvious correlation with the distance from explosive source. It is easy to cause tensile damage to the interface between the rock and the supporting pile if the wave impedance of the rock is rather small. The blast loading causes the readjustment and distribution of the tensile force of the prestressed anchor cables. Based on structural dynamics and wave dynamics theory, the influence mechanisms of blasting on anchored pile supporting structures were analyzed.

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deep excavations / anchored pile supporting / blast loading / numerical simulation / dynamic response

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SUN Pengchang1,2,QIN Weimin2,CHEN Ming1,LU Wenbo1. Influence of blasting in deep excavations on anchored pile supporting structures and its mechanism[J]. Journal of Vibration and Shock, 2021, 40(22): 144-150

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