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| Split grouting mechanism based on nonlinear characteristics of compression process of soil#br# |
| ZHANG Lianzhen1，LI Zhipeng1，2，ZHANG Qingsong1，LIU Rentai1，ZHANG Xiao1，YU Wensheng3 |
(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；
2. School of Transportation and Civil Engineering，Shandong Jiaotong University，Jinan，Shandong 250357，China；
3. Jiangxi Provincial Highway Investment Group Co.，Ltd.，Nanchang，Jiangxi 330025，China) |
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Abstract In the process of split grouting，the soil on both sides of the split channel is being compressed. The relationship between the stress and strain is nonlinear in the compression process of soil. A new model of relationship between the soil stress and strain was established to describe the nonlinear characteristics in the compression process of soil. The process of split grouting was simplified into the horizontal radiation circle. Based on the nonlinear model of compression and considering the coupling effect at the interface between soil and slurry，a theoretical model of split grouting was established. The spatial distribution equation of width of the split channel was derived，and the relationship among the grouting pressure，width of split channel and radius of grouting diffusion was obtained. After comparing with the result from the linear relationship of stress and strain，the nonlinear relationship of stress and strain was shown to be necessary. The model test of split grouting process was performed. The width of split channel attenuated along the diffusion radius. The calculated and measured the thickness of grouting vein are at the same order of magnitude and theory was thus proved reasonable.
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2016, Vol. 35 
