Journal of Yangtze River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (7): 73-79.DOI: 10.11988/ckyyb.20200392

• ROCKSOIL ENGINEERING • Previous Articles     Next Articles

Analysis of Grouting Effect of Water-rich Sandstone Based on Inversion of Permeability by Acoustic Logging

CHEN Bin1, ZHAO Li-quan1, HU Hui-hua2, YAO Sheng-dan3, ZHAO Yan-lin4, LIU Tong1   

  1. 1. Hunan Provincial Key Laboratory of Geomechanics and Engineering Safety, Xiangtan University, Xiangtan 411105, China;
    2. Hunan Provincial Communication Planning Survey and Design Institute Co., Ltd., Changsha 410008, China;
    3. Hunan Huaizhi Highway Construction Co., Ltd., Huaihua 418000, China;
    4. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology,Xiangtan 411201, China
  • Received:2020-05-03 Revised:2020-06-23 Online:2021-07-01 Published:2021-07-08

Abstract: To address the difficulty in point-by-point detection of the grouting effect of water-rich broken sand strata, we propose to evaluate the detailed water-sealing effect of grouting via inversion of permeability using acoustic logging. On the basis of Wyllie-Clemenceau's formula and Kozeny-Carman's formula, we established an acoustic velocity-permeability model for water-rich sandstone. With a foundation grouting project in Hunan as research object, we obtained the acoustic velocity and permeability of rock core and rock strata before and after grouting through core test, acoustic logging, and hydraulic fracturing test. By fitting the core test results with the model, we found a nonlinear negative correlation between acoustic velocity and permeability with an obvious cut-off point of change rate in the curve. Grouting affects the rock matrix acoustic velocity and the exponent to the matrix nature. By comparing the permeability calculated by logging acoustic velocity with the hydraulic fracturing test results, we verified the reliability of the model. In addition, we built a quantitative evaluation system for the grouting effect of water-rich sandstone on the basis of calculated permeability, and evaluated the case using this system.

Key words: water-rich sandstone, grouting effect, acoustic velocity, permeability, acoustic logging

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