基于压汞法的改良土渗透特性研究

发布时间：2018-04-30 13:23

本文选题：渗透试验 + 压汞试验　；参考：《南水北调与水利科技》2017年06期

【摘要】：为探讨改良剂(水泥、固化剂)对土壤渗透性及微观孔隙分布的影响机理,以平原水库粉质黏土为研究对象,采用渗透试验和压汞试验,对改良土的渗透系数及微观孔隙进行研究。结果表明:固化剂使孔隙体积变小,降低改良土的渗透系数,但并非呈线性减小关系;当掺量为2%时,水泥和固化剂之间产生较大的抑制作用。固化剂速凝,可明显缩短施工周期,为工程抢修提供新的发展方向。水泥对改良土渗透性影响最大,随着水泥掺量增加,土体内部由大孔隙向小孔隙过渡。当龄期超过7d,土体渗透性降幅较大,大孔、中孔含量减少,微孔、极微孔逐渐增多;该研究建立了渗透系数与大孔、中大孔孔隙率的函数关系,为改良土作为防渗材料的稳定性分析提供理论依据。
[Abstract]:In order to study the influence mechanism of the modifier (cement, hardener) on soil permeability and micro-pore distribution, the silty clay of plain reservoir was studied by permeation test and mercury injection test. The permeability coefficient and micro porosity of improved soil were studied. The results show that the pore volume is reduced and the permeability coefficient of the improved soil is decreased by the curing agent, but not in a linear relationship, and when the content is 2, the cement and the curing agent have a great inhibition effect. The quick solidifying agent can shorten the construction period and provide a new development direction for the urgent repair of engineering. Cement has the greatest influence on the permeability of improved soil. With the increase of cement content, the internal soil transition from macropores to small pores. When the age is more than 7 days, the permeability of soil decreases greatly, the content of large and medium pores decreases, and the content of micropores and micropores increases gradually, and the relationship between permeability coefficient and porosity of large and medium pores is established. It provides theoretical basis for stability analysis of improved soil as impervious material.
【作者单位】：山东农业大学水利土木工程学院;LEM3 CNRS
【基金】：国家科技支撑计划项目(2015BAB07B05) 山东省省级水利科研及技术推广项目(SDSLKY201305)~~
【分类号】：TV223

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