Abstract Combined with model testing and numerical calculations, the propagation of an explosive stress wave in the surrounding rock of a proposed tunnel and the stability of an existing underground cavern were researched, and the relevant wave distribution law and displacement curve of the vault were obtained. The results show that: (1) the pressure peak decreases with an increase of distance from the explosion point; (2) the vertical pressure peak on the vertical measuring line through the explosion center is greater than the horizontal pressure peak in the same position through the centroid of the cavern, and the vertical pressure peak on the horizontal measuring line is greater than that of the horizontal pressure peak; (3) the pressure peak on the vault is less than the compressive strength of the lining, and moreover, the cavern is safe and stable without the unrecoverable displacement of the vault; and (4) attention should be focused on the dynamic response of the lining at the intersection of the cavern vault, arch foot, and sidewall crown during the blasting of a transportation tunnel.
Abstract：
Combined with model testing and numerical calculations, the propagation of an explosive stress wave in the surrounding rock of a proposed tunnel and the stability of an existing underground cavern were researched, and the relevant wave distribution law and displacement curve of the vault were obtained. The results show that: (1) the pressure peak decreases with an increase of distance from the explosion point; (2) the vertical pressure peak on the vertical measuring line through the explosion center is greater than the horizontal pressure peak in the same position through the centroid of the cavern, and the vertical pressure peak on the horizontal measuring line is greater than that of the horizontal pressure peak; (3) the pressure peak on the vault is less than the compressive strength of the lining, and moreover, the cavern is safe and stable without the unrecoverable displacement of the vault; and (4) attention should be focused on the dynamic response of the lining at the intersection of the cavern vault, arch foot, and sidewall crown during the blasting of a transportation tunnel.
SHEN Jun,
ZHANG Xiang-Yang,
CHEN An-Min etc
.Distribution of an Explosive Stress Wave in Surrounding Rock and the Relevant Stability of an Underground Cavern [J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 55-60
2014, Vol. 51 