基于堆积颗粒几何特征的多尺度渗透注浆扩散半径预测

doi:10.13722/j.cnki.jrme.2022.0986

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Abstract In order to accurately predict the penetration grouting radius in coarse-grained soil，a method for identificating geometrical characteristics of microscale particle and resconstructing mesosceale grouting channels based on the geometrical characteristic of stacked particles was put forward. And combining these two methods and the largescale grouting diffusion model，a multiscale penetration grouting radius prediction model was established. First，based on the mesoscale CT sectional images of geomaterials and employing the geometric characteristics identification method(GIM)，the ellipticity，roughness，long-axis inclination and size of the stacked particles were identified. Then，employing the grouting channel reconstruction method(GRM)，the penetration channel model was reconstructed according to the obtained parameters，porosity and gradation. According to the reconstructed model，the mesoscale penetration diffusion model with statistical significance was obtained using the multi-field coupled finite element method(FEM) and Monte Carlo method(MC). Coupling the mesoscale penetration diffusion model and the largescale grouting diffusion model according to the seepage field results in the multiscale prediction model of penetration diffusion radius. Compared to the existing experimental results，the rationality of the prediction model is verified(the error is less than 10%). Finally，based on the proposed method，this paper systematically studied the influences of ellipticity，roughness，particle size，porosity，long-axis inclination，time-varying factor and average slurry viscosity on grouting diffusion radius. The affecting relationship in reducing order is：particle size，average slurry viscosity，long axis inclination，time-varying factor，porosity，ellipticity and roughness，and the Pearson coefficient is 0.5，－0.374，－0.238，－0.188，0.161，－0.036，－0.019，respectively. Through the analysis of the grouting diffusion process，it is found that the influence mechanism of the geometric characteristics of the stacked particles on grouting diffusion mainly includes the“pore-throat constraint”，“inertia resistance”，“channel width”and“fluid-solid interface”effect.

Key words： soil mechanics penetration grouting diffusion radius stacked particles multi-scale analysis prediction model

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	Articles by authors
	HUANG Xianwen1
	ZHAO Guangming2
	HUANG Shunjie2
	WANG Zezhou3
	WANG Xuesong4
	TANG Chuxuan5

Cite this article:

HUANG Xianwen1,ZHAO Guangming2,HUANG Shunjie2, et al. Multiscale penetration grouting radius prediction based on geometric characteristics of stacked particles[J]. , 2023, 42(8): 2028-2040.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0986 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I8/2028

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