JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2018, Vol. 35 ›› Issue (11): 126-132.DOI: 10.11988/ckyyb.20170500

• HYDRAULIC STRUCTURE AND MATERIAL • Previous Articles     Next Articles

Cement-Sand Paste-slurry for the Seepage-proofing and Reinforcement of Water-rich Karst Macrovoid Formation

KUANG Chu-feng1, ZHANG Gui-jin1, LIU Jie1, LIU Yun-gui2, YANG Ju2   

  1. 1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, China;
    2. Geological Prospecting Team for Water Resources and Hydropower Engineering in Honghe Hani Yi Autonomous Prefecture, Mengzi 661199, China
  • Received:2017-05-05 Revised:2017-06-26 Online:2018-11-01 Published:2018-11-16

Abstract: The grouting of water-rich karst macrovoid formation is a difficult problem in foundation treatment as the filling, seepage-proofing and reinforcement requirements are high. Commonly used mortar is of poor water-dilution resistance, while cement paste-slurry is of weak controllability and serious waste. In view of the respective advantages of paste-slurry and sand, a novel controllable cement-sand paste-slurry which is suitable for water-rich Karst macrovoid formation is proposed in this paper via long-term indoor test with large sample. Results demonstrate that the cement sand paste-slurry is of large viscosity and initial yield stress with the bleeding rate declining to 0%-3%, the minimum fluidity reaching 10-20 cm, and the setting time adjustable in 2-30 min. In the flow rate of 0.4-0.6 m/s, the slurry retention rate reaches 85% after water scouring and dilution, stone rate is nearly 100%, and the 28 d compressive strength reaches about 10 MPa. Moreover, the cost of the cement-sand paste-slurry slurry is equivalent to ordinary cement paste-slurry; the slurry also has social benefits such as environmental protection. Although cement-sand paste-slurry is the preferred material for the seepage-proofing and reinforcement of water-rich karst macrovoid formation, the pumpability should receive enough attention in practical engineering application.

Key words: water-rich karst macrovoid formation, cement sand paste-slurry, grouting material, seepage-proofing, reinforcement

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