Electro-osmosis grouting reinforcement of scaling off earthen sites(III): Back compression experiment and reinforcement mechanism
CUI Kai1, 2, LI Shuhuan1, 2, XU Pengfei1, 2, WEI Xin1, 2, WEN Xiangyu1, 2, PEI Qiangqiang3
(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Silk Road Cultural Heritage Protection Research Institute, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3 National Ancient Mural Protection Engineering Technology Research Center, Dunhuang, Gansu 736200, China)
Abstract：Performing back compression on the scaling-off-stabilized grout body is a crucial aspect of reinforcing earthen sites affected by scaling through electro-osmotic grouting methods. This study involved on-site experiments to assess scaling-off reinforcement by implementing two distinct back compression modes. It evaluated the normal compression of the grouted body under varying back compression conditions, identified characterization indicators for the reinforcement effect of the back-compression-stabilized grout body, and analyzed the relationship between the work done by back compression and the energy efficiency ratio. Microstructural analysis and principal component analysis were employed to elucidate the reinforcement mechanism of the electro-osmotic grouting method from both qualitative and quantitative perspectives. The research findings indicate that the normal compression of the grouted body under different back compression modes, the characterization indicators of the reinforcement effect of the back-compression-stabilized grout body, and the work done by back compression all increase non-linearly with the rise in back-compression levels. Conversely, the energy efficiency ratio declines non-linearly as back-compression levels increase. Notably, the performance of back compression at a constant force of 25 kPa is found to be optimal in a comprehensive assessment. The synergistic effect of SH solution solidification and back compression enhances the interfacial connections between soil particles, establishes a stable combination with effective force chain transmission, and significantly improves resistance to scaling-off reinforcement.
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2025, Vol. 44 
