Experimental investigation on sealing efficiency of chemical grouting in rock fracture with flowing water |
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| Affiliation: | 1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, China;2. Department of Civil Engineering, Ryerson University, Toronto, Canada;3. Changjiang Institute of Survey, Planning, Design and Research, Wuhan, China;4. Chongqing Design and Research Institute of China Coal Technology and Engineering Group, Chongqing, China;1. Department of Mining Engineering, Isfahan University of Technology, Isfahan, P.O. Box 8415-683111, Iran;2. Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran;3. Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran;1. Department of Mining Engineering, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran;2. Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran;3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong;4. Mathematical Department, Shahrood University of Technology, Shahrood, Iran;1. Division of Soil and Rock Mechanics, KTH Royal Institute of Technology, Sweden;2. Division of Resources, Energy and Infrastructure, Royal Institute of Technology, Sweden;3. Skanska Sweden AB, Sweden;1. Division of Resources, Energy and Infrastructure, Department of Sustainable development, Environmental science and Engineering, Royal Institute of Technology, 10044 Stockholm, Sweden;2. Division of Soil and Rock Mechanics, Department of Civil and Architectural Engineering, Royal Institute of Technology, 10044 Stockholm, Sweden;3. Skanska AB, 11274 Stockholm, Sweden |
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| Abstract: | This paper presents an experimental investigation of the main factors that influence the sealing efficiency of chemical grouting in a permeated fracture replica. Chemical grouting has been widely used to control groundwater inrush in underground mining. However, the relationship between the sealing efficiency of grouting and its influencing factors is one of the many critical issues that still remain unsolved. The four factors tested in the orthogonal experiment include the fracture aperture width, initial water flow speed, gel time, and grout take. The sealing efficiency is evaluated and graded by the reduction of water drainage through the fracture after grouting. The experimental results of the orthogonal arrays show that two most influencing factors on sealing efficiency are the initial water flow speed and the aperture width, where the former has a higher impact than the latter. In a comparison with the two other factors, it is found that the grout take and gel time have less influence. The patterns of grout propagation are classified into four types: (1) total sealing off; (2) partial sealing off with erosion along boundaries; (3) partial sealing off with internal erosion; and (4) total erosion. The interaction between the injected grout and flowing water slows down the water flow and the grout starts to solidify at a downstream location where the retention time for grout is longer than its gel time. |
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| Keywords: | Rock fracture Chemical grouting Sealing efficiency Flowing water Orthogonal array |
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