地下工程涌突水注浆止水浆液扩散机制和封堵方法研究

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Abstract Grouting has been indicated to be an effective technological means to manage water inrush，which is one of the major geological hazards in underground engineering. However，the dynamic grouting theory，especially the mechanisms of grout diffusion and plugging of fracture in hydrodynamic condition，are not studied systematically and meticulously. In order to evaluate the dynamic grouting for plugging water inrush from fractured rock mass，a quasi-3D fracture model test-bed is developed. Through analyzing 218 groups of dynamic grouting tests data，U-shaped diffusion law and the sectionalized and layered diffusion mechanism of grout are proposed. The principle of fast water-separating and the mechanism of depositing-core diffusion are studied. Quantitative evaluations of grout diffusion and plugging effect are realized. Based on the research above，a new technology of plugging water inrush，with the controlling factor RGW(ratio of grout injection to water discharge through unit width of fracture per unit time)，is put forward. The practical effect of research results is verified through the model test and field test in Longgu coal mine. The research results may play a promoting role in developing dynamic grouting theory and guiding engineering practice.

Key words： rock mechanics dynamic grouting model test grout diffusion mechanism plugging mechanism engineering application

Received: 27 April 2011

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http://www.rockmech.org/EN/Y2011/V30/I12/2377

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