- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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| Citation: | QIN Pengfei, ZHONG Hongwei, LIU Jian, SU Danna, SUN Zhuoyu. Analysis of Split Grouting Mechanism Considering Coupling Effect of Slurry and Soil Stress[J]. Journal of Southwest Jiaotong University, 2023, 58(3): 584-591. doi: 10.3969/j.issn.0258-2724.20220433
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The coupling effect of slurry and soil stress has a significant influence on the slurry diffusion law of split grouting, which should be fully considered in the design phase of split grouting. The split grouting is regarded as a circular expansion process in an infinite plane domain. Based on the Newtonian constitutive equation, variation characteristics of the slurry flow field are analyzed. The sand layer under the splitting channel is regarded as a semi-infinite elastic body. The distribution equations of the splitting channel width and the slurry pressure under the uniform load are derived by elastic mechanics. By setting different slurry viscosity and sand elastic modulus parameters, the basic mechanism of split grouting in sandy soil under coupling effect is revealed. The results show that the slurry pressure decreases rapidly at the orifice and the far end, but changes slowly in the middle section. The width of the splitting channel is basically determined by the slurry pressure, and has a distribution trend the same as that of the slurry pressure. The viscosity of slurry and the elastic modulus of sand are important factors affecting the splitting diffusion radius , and both are positively related to the diffusion radius. The slurry viscosity is positively related to the splitting width, while the modulus is negatively related to the splitting width. Finally, a comparison was made through a project under construction, and it was found that the deviation between the theoretical calculation value and the actual excavation value was 12%−15%, which basically met the expected requirements.
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