不同水化学环境条件下吹填土的自重固结特性

doi:10.13722/j.cnki.jrme.2019.1099

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摘要为了研究不同水化学环境对吹填土的自重沉降的影响，采用室内量筒试验测量不同水化学环境下吹填土的沉降量和沉降速率，并利用滴定试验测定沉降结束后上清液离子含量的变化，探究不同水化学环境对吹填土自重固结的影响规律及微观机制。研究结果表明：碱性(pH = 10)环境和酸性(pH = 2)环境均能在固结沉降前期有效提高吹填土的沉降速率，然而最终沉降量会随着pH值的增大而逐渐减小；随着Ca2+含量的增加，在酸性和中性环境下，吹填土的沉降量和沉降速率逐渐增大；在碱性环境下，吹填土的沉降量和沉降速率呈现出先增加后降低并趋于稳定的变化趋势。研究结果对于实现吹填土的快速沉降处理具有指导意义。

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	雷华阳1
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	章纬地1
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	王磊1
	王鹏1

关键词 ：土力学, 吹填土, 固结沉降, pH值, Ca2+含量, 沉降机制, 粒间应力

Abstract：In order to investigate the effect of hydro-chemical conditions on the self-weight settlement of dredged fill，the cylinder settlement test was carried out in this study，and the settlement and settlement rate were analyzed. In addition，the change in the ion content of the supernatant was determined by titration tests after the sedimentation，and the effect of hydro-chemical conditions on the self-consolidation of dredged fill and the respectively micro-mechanism were investigated. The results show that both alkaline(pH = 10) and acidic(pH = 2) conditions could effectively improve the settlement rate of the dredged fill at initial stage，while the final settlement gradually decreased with the increase of pH value. With the increase of Ca2+ content，the settlement and the settlement rate of dredged fill increased under acidic and neutral conditions，and the settlement and settlement rate of dredged fill showed a trend of increasing first，then decreasing and finally being stable under alkaline condition. The results in this study are meaningful for improving the settlement of dredged fill.

Key words： soil mechanics dredged fill consolidation settlement pH value Ca2+content settling mechanism intergranular stress

引用本文:

雷华阳1，2，章纬地1，薄钰1，王磊1，王鹏1. 不同水化学环境条件下吹填土的自重固结特性[J]. 岩石力学与工程学报, 2020, 39(S1): 3049-3057.
LEI Huayang1，2，ZHANG Weidi 1，BO Yu1，WANG Lei 1，WANG Peng1. Self-consolidation characteristics of the dredged fill under different hydro-chemical conditions. , 2020, 39(S1): 3049-3057.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1099 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3049

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