电渗–真空联合作用下富水黄土的排水固结特性分析

doi:10.13722/j.cnki.jrme.2022.0413

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摘要以富水黄土隧道开挖前围岩的快速排水为目的，提出电渗联合真空的方法，并对其排水固结过程进行了理论分析和试验研究。基于多孔介质理论和非饱和土力学原理，建立非饱和土体在电渗–真空作用下电场–孔压场–位移场相互耦合的数学模型，利用有限单元法数值分析土体在电渗–真空作用下的排水固结规律，并结合室内模型试验进一步验证该方法在富水黄土快速排水中的应用效果。研究结果表明：电渗–真空联合作用可以有效的提高土体的排水效率，但当初始渗透率较大时，联合排水后期会出现“孔压反转”现象，这种现象会导致联合排水后期排水效率低下，揭示联合排水后期增大电压并不能有效提高排水效率的机制；电极间距主要对电渗–真空联合排水后期孔隙水压力的变化有较大影响，且阳极电势一定时，孔隙水压力不随电极间距成单调变化。

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	周凤玺1
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	张甲华1
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	马强3
	牟占霖1
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关键词 ：土力学, 非饱和土, 电渗&ndash, 真空预压, 多场耦合, 数值模拟

Abstract：For the purpose of rapid drainage of surrounding rock before excavation of water-rich loess tunnels，a method of electro-osmosis combined with vacuum is proposed，and the theoretical analysis and experimental research on the drainage consolidation process are carried out. Firstly，based on the theory of porous media and the principle of unsaturated soil mechanics，a mathematical model of mutual coupling of electric field，pore pressure field and displacement field under the combined action of electro-osmosis and vacuum is established. Then，the drainage consolidation law of soil under the combined action of electro-osmosis and vacuum is deeply analyzed by using the finite element method. Combined with the indoor model test，the application effect of this method in the rapid drainage of water rich loess is further analyzed. The results show that the combined action of electro-osmosis and vacuum can effectively improve the drainage efficiency of soil，but when the initial permeability is large，the phenomenon of “pore pressure reversal” will appear in the later stage of combined drainage，which will lead to the low drainage efficiency in the later stage of combined drainage，which explains that increasing the voltage in the later stage of combined drainage can not improve the drainage efficiency. The electrode spacing mainly has a great influence on the change of pore water pressure in the later stage of electro-osmosis combined with vacuum preloading drainage，and when the anode potential is constant，the pore water pressure does not change monotonically with the electrode spacing.

Key words： soil mechanics unsaturated soil electro-osmosis combined with vacuum preloading multi-field coupling numerical simulation

引用本文:

周凤玺1，2，张甲华1，2，马强3，牟占霖1，2. 电渗–真空联合作用下富水黄土的排水固结特性分析[J]. 岩石力学与工程学报, 2023, 42(3): 724-735.
ZHOU Fengxi1，2，ZHANG Jiahua1，2，MA Qiang3，MOU Zhanlin1，2. Analysis of drainage consolidation characteristics of water-rich loess under the combined action of electro-osmosis and vacuum. , 2023, 42(3): 724-735.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0413 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I3/724

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