Dust Reduction and Removal Schemes for Large Crosssection Tiantaishan Highspeed Highway Tunnel of Qinling Mountains

doi:10.3973/j.issn.2096-4498.2019.S1.015

Tunnel Construction ›› 2019, Vol. 39 ›› Issue (S1): 101-109.DOI: 10.3973/j.issn.2096-4498.2019.S1.015

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Dust Reduction and Removal Schemes for Large Crosssection Tiantaishan Highspeed Highway Tunnel of Qinling Mountains

SONG Bin¹, DONG Changsong¹, GUO Chun^{2, 3, *}, WANG Xin^{2, 3}, SONG Junxiu^{2, 3}

(1. CCCC First Highway Consultants Co,.Ltd., Xi′an 710065, Shaanxi, China;  2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;  3. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Chengdu 610031, Sichuan, China)

Received:2019-04-15 Revised:2019-08-14 Online:2019-08-30 Published:2019-09-12

Abstract

Abstract:

The dust produced during construction of large crosssection tunnel cannot be easily exhausted by construction ventilation. Hence, field monitoring is carried out on dust concentration under conditions of drilling, blasting, mucking, spraying, etc.; the dust distribution characteristics under different constructions are numerically simulated according to monitoring data; and the dust control measures for large crosssection tunnel construction are put forward. It is showed that the dust concentrations under mucking and spraying exceed limit much. It is concluded by numerical simulation that: (1) The dust concentration in the area 40 m close to the excavation face is unstable, the downward trend is not obvious. (2) In order to ensure that the fresh air arrives at the excavation face with a larger spray surface, the distance between duct pipe end to excavation face is recommended to be 60 to 80 m when arranging the ventilation pipes. (3) It is recommended to use the wallhung wind pipe dust reduction + vehiclecarried dust removal scheme, whose dust removal efficiency can reach 95%, and which can effectively reduce the dust concentration in various areas of the tunnel, and has little impact on construction.

Key words: large crosssection tunnel, construction dust, dust reduction and removal, numerical simulation

CLC Number:

U 45

SONG Bin, DONG Changsong, GUO Chun, WANG Xin, SONG Junxiu. Dust Reduction and Removal Schemes for Large Crosssection Tiantaishan Highspeed Highway Tunnel of Qinling Mountains[J]. Tunnel Construction, 2019, 39(S1): 101-109.

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Dust Reduction and Removal Schemes for Large Crosssection Tiantaishan Highspeed Highway Tunnel of Qinling Mountains

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