When the cantilever roadheader is used to excavate the tunnel, a large amount of dust is produced during the rock-breaking process, seriously affecting the working environment and the health of the construction personnel. Spray dust reduction with a dust suppressant is one of the main control measures. The chemical composition of traditional dust suppressants is single, which can only play a role in the dust composition of specific particle sizes, and it is difficult to remove the mixed dust of different particle sizes at the same time. Based on the background of the Changshui Airport Tunnel of Chongqing-Kunming High-speed Railway, in order to solve the problem of poor spray dust removal effect, a certain mass fraction of surfactant is added to the water. Through the experimental study on the surface tension of various surfactants and the wettability of the compound solution, the optimum surfactant and its concentration are determined, and it has been successfully applied in practical engineering. The results show that the addition of a certain mass fraction of surfactant in water can effectively reduce the surface tension and wettability of water. The dust-reducing agent composed of K12 and C24E9 with a mass fraction of 0.05% has the best dust removal effect on the dust generated during the excavation of limestone tunnels, which can effectively reduce the dust caused by excavation. The research results provide an important reference for the selection of dust-reducing agents for the construction of cantilever boring machines.
Guo Yongfa
,
Feng Zhiwei
,
Chen Qianli
,
Ding Wenqi
,
Wang Huawu
. Study on Adaptability of Dust-Reducing Agent for Tunnel Cantilever Roadheder[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 803
-810
.
DOI: 10.20174/j.JUSE.2024.S2.33
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