Abstract
This paper describes a new method using water–silt composite blasting for tunneling and the field tests conducted in the Tieshanping tunnel, Chongqing City, China. In this method, water–silt composite is substituted for the traditional pure silt stemming of the blast holes. Because of the incompressibility of water, the attenuation of the blasting wave is postponed and the effect of the blast air extended. The water–silt blasting method resulted in a larger crack zone, improved the breakage of rock, reduced the rock heap, lowered the dust and saved explosive. The stability of the surrounding rock was studied using theoretical analysis, in situ measurements and numerical modeling. The measured displacement at the tunnel crown was in good agreement with the theoretical and numerical results.
Résumé
L’article décrit une nouvelle méthode utilisant un composé eau-argile dans les opérations de creusement de tunnel à l’explosif. Les essais de terrain ont été réalisés dans le tunnel de Tieshanping de la municipalité de Chongqing (Chine). Dans cette méthode, le composé eau-argile remplace le traditionnel bourrage d’argile pure dans les trous de foration. Du fait de l’incompressibilité de l’eau, l’onde de choc est atténuée et l’onde aérienne augmentée. L’utilisation du composé eau-argile a pour conséquence la formation d’une zone de fissuration plus étendue, une fragmentation de la roche améliorée, une diminution du volume du tas abattu, une réduction des poussières et une économie de substances explosives. La stabilité des masses rocheuses environnantes a été étudiée suivant une analyse théorique, des mesures en place et une simulation numérique. Les déplacements mesurés en couronne du tunnel étaient en bon accord avec les résultats théoriques et numériques.
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Acknowledgments
The work presented in this paper was supported by a talent introduction research grant and a Qihang plan grant from China University of Science and Technology.
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Cui, ZD. Effect of water–silt composite blasting on the stability of rocks surrounding a tunnel. Bull Eng Geol Environ 70, 657–664 (2011). https://doi.org/10.1007/s10064-010-0346-3
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DOI: https://doi.org/10.1007/s10064-010-0346-3