高聚物膜袋注浆对土体挤密效应仿真分析

doi:10.3724/1000-6915.jrme.2024.0873

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Abstract This study investigates the compaction mechanism of membrane bag polymer grouting in soil by establishing a two-dimensional simulation method that integrates the modified Cam-clay model with polymer chemical reaction theory and the finite element method. The reliability of this method is validated through comparisons of experimental results and simulated outcomes regarding the size, density, and soil squeezing pressure of pile-shaped solids under various conditions. Based on these comparisons, the time-history variations in volume, density, expansion pressure, and other parameters of the polymer solid are analyzed, along with the spatiotemporal characteristics of soil stress, density, and void ratio during soil compaction. Furthermore, the effects of grouting quantity, preheating temperature, and soil density on expansion and reinforcement outcomes are examined. The results indicate that upon injection into the bag, the polymer slurry reacts rapidly, expanding and compressing the surrounding soil, which enlarges the grouting hole. The stress and density of the soil adjacent to the hole progressively increase, while the void ratio decreases. Additionally, as the distance from the center of the grouting hole increases, the effect of soil compaction gradually diminishes, with soil parameters outside of approximately six times the pile diameter largely returning to their initial state. The final diameter and density of the polymer solid increase with the amount of grouting, thereby enhancing the soil reinforcement effect. An increase in preheating temperature accelerates both the expansion rate of the polymer and the compaction process; however, it does not significantly affect the final reinforcement outcome. Denser soil surrounding the hole results in a smaller final diameter and greater density of the polymer solid. Under varying working conditions, the expansion pressure of the grout is zero in the early stage, experiences approximately linear rapid growth in the middle stage, and subsequently shows a decreasing growth rate that stabilizes in the late stage. The work presented in this paper provides a reference for further research on the mechanisms of soil compaction through membrane bag polymer grouting.

Key words： soil mechanics polymer membrane bag grouting compaction mechanism simulation method

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	Articles by authors
	LI Xiaolong1
	2
	WANG Ge1
	2
	LI Lulu3
	SHI Mingsheng1
	2
	ZHONG Yanhui1
	2
	ZHANG Bei1
	2
	WANG Fuming1
	2

Cite this article:

LI Xiaolong1,2,WANG Ge1, et al. Simulation analysis of soil compacting effect by membrane bag polymer grouting[J]. , 2025, 44(8): 2164-2177.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0873 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I8/2164

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