Vieillissement d’une mousse à base de tensioactif dans un sol sableux-argileux modèle

Moez Selmi, M. Kacem, M. Jamai, Philippe Dubujet
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Abstract

Lubricants are used in the excavation procedure by earth pressure tunneling machines (EPBs). They help to fluidize the soil structure and thus prevent the clay from sticking to the cutting head. Excavated soil is classified as waste and stored in the disposal area. Reuse of this type of soil depends on their state after excavation and their evolution over time. To identify and understand the physical and mechanical evolu tion of excavated soil, a first step is to analyze physi cal evolution of foam on the soil. The foaming agents are characterized by aging which results in a physical modification of the foam. The aim of this study is to analyze the aging of CLB F5TM surfactant based li quid foam mixed with clayey sandy soil. The evolution of the volume of the foam over time shows a rapid degradation of the bubbles that constitute it. The phy sical degradation of the foam in the soil takes more time compared to the foam in the open cell thanks to the protection of bubbles by porous media. A column drainage test was performed to identify the evolution of the foam in the mixture through its effect on inters titial pressure. These tests show that the presence of the foam in the mixture promotes the drainage phe nomenon compared to the case of unconditioned soil.
表面活性剂基泡沫在沙质粘土模型中的老化
土压掘进机在开挖过程中使用润滑剂。它们有助于流化土壤结构,从而防止粘土粘在切割头上。挖出的土被归类为废物,存放在处置区内。这类土壤的再利用取决于其开挖后的状态及其随时间的演变。为了识别和了解开挖土体的物理力学演化,首先要分析土体上泡沫的物理演化。发泡剂的特点是老化导致泡沫的物理改性。本研究的目的是分析CLB F5TM表面活性剂基泡沫液与粘性砂土混合后的老化情况。随着时间的推移,泡沫体积的演变表明构成泡沫的气泡迅速降解。由于多孔介质对泡沫的保护,土壤中泡沫的物理降解比开放池中的泡沫需要更多的时间。通过柱排水试验,确定了泡沫通过其对初始压力的影响在混合物中的演变。这些试验表明,与无条件土的情况相比,泡沫混合物的存在促进了排水现象。
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