增压式真空预压气体运移加固机制模型试验研究

doi:10.13722/j.cnki.jrme.2022.0142

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摘要针对增压式真空预压法加固超软土过程中气体运移路径和加固作用机制认识不统一的问题，设计进行探究气体运移路径的增压式真空预压试验和增压式真空预压水平排水板试验。通过对比分析土体排水量、孔隙水压力值、沉降量、十字板剪切强度和含水率等试验结果，得到以下结论：增压式真空预压加固超软土过程中，进行注气操作后气体首先向土体表面方向运移。同时，结合注气操作时的实时孔压变化情况，分析认为注气操作提升土体排水固结效果的主要作用机制为：进行注气操作时，增压气体的上升会带动深层孔隙水向浅层运移，使深层孔隙水在浅层被排水板快速吸收并排出，以此提高深层土体加固效果和整体排水效率。

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	刘景锦1
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	李建楷1
	雷华阳1
	2

关键词 ：土力学, 真空预压, 增压法, 气体运移, 加固机制

Abstract：At present，the academic circles have different understanding of the gas migration path after gas injection operation and reinforcement mechanism of air-booster vacuum preloading. In view of this problem，several groups of air-booster vacuum preloading model experiments were designed to explore the gas migration path after gas injection operation and reinforcement mechanism of air-booster vacuum preloading. By comparing and analyzing the test results of drainage，pore water pressure，settlement，vane shear strength and water content，the following conclusions were obtained：in the process of treating ultra-soft soil by air-booster vacuum preloading，the gas moves to the soil surface first after gas injection. At the same time，by considering the real-time pore pressure change during gas injection operation，it is speculated that the main mechanism of gas injection operation to improve the drainage and consolidation effect of soil is as follows：during gas injection operation，the rise of pressurized gas will drive the deep pore water to migrate to the shallow layer，so that the deep pore water can be quickly absorbed and discharged by the drainage plate in the shallow layer，so as to improve the reinforcement effect of deep soil and the overall drainage efficiency.

Key words： soil mechanics vacuum preloading air-booster vacuum preloading gas migration reinforcement mechanism

引用本文:

刘景锦1，2，李建楷1，雷华阳1，2. 增压式真空预压气体运移加固机制模型试验研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3598-3608.
LIU Jingjin1，2，LI Jiankai1，LEI Huayang1，2. Model experimental study on gas migration and reinforcement mechanism of air-booster vacuum preloading#br#. , 2023, 42(S1): 3598-3608.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0142 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3598

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