Abstract
Natural fractures are normally accompanied with a certain roughness, which could significantly affect the grout penetration through them and grouting effect. In this paper, an experimental system for studying grout flow through rock fractures with three-dimension rough surfaces was presented. This apparatus can simulate the grouting process in rough rock fracture, and the real-time grout penetration through rough fracture can be directly observed. To evaluate the effect of the surface roughness on grout flow within rough fractures and obtain the distribution characteristics of the cement slurry concentration in rough fracture, two different grouting tests were conducted. Results show that the slurry penetration front advanced unevenly under the radial and quasi-one-dimensional diffusion form. Water was bleeding from the slurry penetration front when the slurry penetrated at a low speed. The concentration of cement slurry decreased along the direction of grout penetration, showing an obvious flow thinning trend. The distribution of cement slurry concentration along the penetration zone was related to the penetration length and penetration width. This test system is capable of providing potential guidance for evaluating the grouting performance in construction engineering.
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