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Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling
Graphical abstract Display Omitted
Highlights The contact angle of new complexing foaming agent (CFA) is 20–30°. The foam preparation method for dust suppression is proposed. A foaming system is located on the roadheader for suppressing cutting rock dust. The foam made a remarkable dust suppression effect. The foam technical cost only accounts for 1–1.5% of construction investment.
Abstract Dust is a serious threat to workers’ health and safety in underground tunneling. Suppressing dust with foam is an efficient means in the confined workplace. The performance test of foaming agent showed that the new complexing one had a smaller contact angle against dust, less than 50% of water, and its viscosity reached up to 358 times that of water. Then a noble foam preparation method was proposed with a jet device adding foaming agent. Using a venturi foam generator, high performance foam was generated. Field application was carried out through locating the foaming system and foam nozzles on the roadheader. Testing results indicated that the foam efficiencies on suppressing total dust and respirable dust were 85.7% and 88.1% at the driver position. They were 2.26 and 2.47 times higher when compared to the water spraying. The air visibility improved from 0.39m to 5.0m after a short time of foam spraying. The foam technical cost only accounted for 1–1.5% of construction investment. Therefore, there is reason to believe that the study will promote foam technology widely used for dust suppression in underground tunneling.
Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling
Graphical abstract Display Omitted
Highlights The contact angle of new complexing foaming agent (CFA) is 20–30°. The foam preparation method for dust suppression is proposed. A foaming system is located on the roadheader for suppressing cutting rock dust. The foam made a remarkable dust suppression effect. The foam technical cost only accounts for 1–1.5% of construction investment.
Abstract Dust is a serious threat to workers’ health and safety in underground tunneling. Suppressing dust with foam is an efficient means in the confined workplace. The performance test of foaming agent showed that the new complexing one had a smaller contact angle against dust, less than 50% of water, and its viscosity reached up to 358 times that of water. Then a noble foam preparation method was proposed with a jet device adding foaming agent. Using a venturi foam generator, high performance foam was generated. Field application was carried out through locating the foaming system and foam nozzles on the roadheader. Testing results indicated that the foam efficiencies on suppressing total dust and respirable dust were 85.7% and 88.1% at the driver position. They were 2.26 and 2.47 times higher when compared to the water spraying. The air visibility improved from 0.39m to 5.0m after a short time of foam spraying. The foam technical cost only accounted for 1–1.5% of construction investment. Therefore, there is reason to believe that the study will promote foam technology widely used for dust suppression in underground tunneling.
Experimental investigation and field application of foam used for suppressing roadheader cutting hard rock in underground tunneling
Lu, Xinxiao (author) / Wang, Deming (author) / Xu, Chaohang (author) / Zhu, Chaobing (author) / Shen, Wei (author)
Tunnelling and Underground Space Technology ; 49 ; 1-8
2015-03-27
8 pages
Article (Journal)
Electronic Resource
English
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