Abstract
In order to obtain a reasonable plan for synchronous grouting of the shield in anhydrous sandy cobble stratum, based on the basic physical and mechanical characteristics of sandy cobble stratum and local construction conditions, the grouting material was selected, the influence of various factors on mortar performance was analyzed based on orthogonal experiments, and multi-objective optimization of mortar performance was carried out based on BP neural network and genetic algorithm. The results show that bentonite, cement and water are the main factors affecting the consistency of the mortar. The main factors affecting the bleeding rate of the mortar are plain sand, cement, coal ash and bentonite. The main factors affecting the density of the mortar are cement, coal ash, water and bentonite. The main factors affecting the compressive strength of the mortar are cement, sand and bentonite. Based on the multi-objective optimization of mortar performance by BP neural network and genetic algorithm, the optimal mass ratio of mortar is cement (80): coal ash (326): bentonite (40): lime (40): sand (1,068): water (333). Compared with the primary plan obtained by orthogonal experiments, this plan is lower in consistency and bleeding rate within the allowable rang, while the density and strength are higher, and this plan has achieved good practical results in construction. The research results can provide a reference for the selection of mortar ratio under similar formation conditions.
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All the data in this paper are obtained from tests in this study, and no other data were used to support this study.
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Acknowledgements
This work was supported by Chongqing University of Science and Technology Graduate Students’ Science and Technology Innovation Program (YKJCX2120657, YKJCX2020654).
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Chongqing University of Science and Technology Graduate Students’ Science and Technology Innovation Program, YKJCX2120657, Liyun Zhang, YKJCX2020654, Liyun Zhang
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Wang, X., Jiang, B., Zhang, L. et al. Study on Optimization of Shield Synchronous Grout Injection in Anhydrous Sand Cobble Formation. Geotech Geol Eng 41, 577–588 (2023). https://doi.org/10.1007/s10706-022-02302-7
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DOI: https://doi.org/10.1007/s10706-022-02302-7