Development and application of grouting simulation test system considering slurry seepage-rock mass deformation coupling effect
To study the slurry seepage-rock mass deformation coupling effect during grouting in fractured rock mass,a visual fracture grouting simulation test system with variable fracture aperture was developed independently.This system included slurry supply equipment,grouting simulation equipment and data monitoring equipment.It had good sealing performance and achieved fracture aperture change under grouting pressure,and can simulate the slurry flow process under the influence of multi-source factors such as grouting flowrate,water-cement ratio,lateral pressure and so on.It was also can be used to study the mechanism of gas seepage-rock mass deformation coupling effect.A grouting simulation experiment was conducted using the system to investigate the slurry seepage-rock mass deformation coupling effect.The results showed that:the increase in fracture aperture weakened the expansion effect of grouting pressure on fracture plate,reducing energy loss during slurry flow,the decrease in water-cement ratio significantly enhanced the slurry seepage-rock mass deformation coupling effect,and the increase in lateral pressure weakened the degree of slurry seepage-rock mass deformation coupling effect.The results of grey correlation analysis showed that the order of factors affecting the sensitivity of slurry seepage-rock deformation coupling effect was grouting flow＞lateral pressure＞slurry water-cement ratio＞fracture aperture.The development of this test system provides a new method for studying fluid-structure interaction and engineering applications of rock mass deformation induced by grouting in fractured aquifers.
rock mechanicsrock mass fractureslurry diffusionrock mass deformationvisual simulation test
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