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- Title
瓦斯抽采钻孔封孔水泥砂浆黏度时变性扩散模型.
- Authors
张宏图; 李 阳; 姚邦华; 王 冕
- Abstract
In order to accurately predict the diffusion characteristics of cement mortar grouting and sealing slurry in gas drainage boreholes, and considering the influence of time-dependent viscosity of slurry on the diffusion of cement mortar and the effect of stress on coal deformation, a time-dependent viscosity diffusion model of cement mortar grouting based on the theory of grouting fluid-solid coupling is presented in this study. The time-dependent viscosity diffusion model of the sealing viscosity of the drilling cement mortar, using COMSOL numerical simulation to study the distribution characteristics of the grout diffusion under different grouting pressures and considering the influence of the time-dependent viscosity of the grout on the results of the grouting diffusion range, and the field test verification is carried out in Xinyi Coal Mine. The research results show that: (1)The time-dependent diffusion model presented in this study comprehensively considers the influence of slurry viscosity time-dependent and grouting pressure on coal deformation, which can more comprehensively predict the slurry diffusion characteristics during grouting; (2)When the water-cement ratio is 0.9, the cement slurry grouting effect can he achieved and the corresponding cement slurry viscosity gradually shows an exponential growth with time; ®The time-dependent viscosity characteristic of cement mortar slurry plays a direct effect on the spreading range of the slurry. Considering the time-dependent viscosity of the slurry, the diffusion range is smaller than when the viscosity of the slurry is considered as a constant slurry; @The actual verification effect of the cement mortar diffusion model with the time-dependent viscosity of the gas drainage borehole shows that the optimal sealing grouting pressure is 1.4 MP a. The research results can provide theoretical support for further optimizing the cement mortar grouting sealing scheme and improving the quality of gas drainage borehole sealing.
- Publication
Coal Science & Technology (0253-2336), 2020, Vol 48, Issue 10, p52
- ISSN
0253-2336
- Publication type
Academic Journal
- DOI
10.13199/j.cnki.est.2020.10.005