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GEOTECHNICAL CENTRIFUGE STUDY ON AIR FLOW DURING AIR SPARGING

机译：空气散发过程中气流的岩土离心研究

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Air sparging (AS) is one of the most efficient techniques to remediate saturated soils and groundwater contaminated with voltaic organic compounds.Knowledge of the extent of the zone affected by the injected air is essential in designing in situ air sparging system.In this research,the centrifuge modeling tests were conducted to simulate the air sparging process in 2D scenario.The glass beads with different size were used as soil simulant to facilitate the visual observation of air movement in saturated porous media.The air flows in micro-channel in fine porous media and in individual bubbles in coarse media.The characteristics of zone of influence (ZOI) were studied at a wide range of sparging pressures and centrifuge g-levels.The test results show that the ZOI is cone-shaped and it can be depicted by two parameters:the width at the tip of the cone or lateral intrusion and the cone angle.Increasing sparging pressure will lead to increase in both lateral intrusion and the cone angle.With further increasing in air injection pressure,the cone angle reaches a constant value while the lateral intrusion will become the main contributor to the enlargement of ZOI.The characteristics of ZOI are related with the effective sparging pressure ratio,which is defined as the difference between sparging pressure and hydrostatic pressure normalized with respect to the effective overburden pressure at the sparging point.The air flow velocity increases with the increase of the sparging pressure,and the slope of mass flow rate with effective sparging pressure ratio increases with higher g-levels.These conclusions provide valuable references for design and application of air sparging for groundwater remediation.
机译：空气喷射（AS）是修复饱和土壤和被伏打有机化合物污染的地下水的最有效技术之一，了解注入空气影响区域的范围对于设计现场空气喷射系统至关重要。进行了离心建模试验以模拟二维场景中的空气喷射过程，使用不同尺寸的玻璃珠作为土壤模拟物，以方便视觉观察饱和多孔介质中的空气运动。在大范围的喷射压力和离心力g水平下研究了影响区域（ZOI）的特性，测试结果表明ZOI是锥形的，可以用两个参数：圆锥体顶部或横向侵入的宽度和圆锥角。增加喷射压力将导致横向侵入和圆锥角均增加。空气注入压力的进一步增加，锥角达到一个恒定值，而侧向侵入将成为ZOI扩大的主要因素。ZOI的特性与有效喷射压力比有关，定义为有效喷射压力比。喷射压力和静水压力相对于喷射点处的有效上覆压力进行归一化。空气流速随喷射压力的增加而增加，质量流量与有效喷射压力比的斜率随g值的升高而增大。这些结论为空气喷射技术在地下水修复中的设计和应用提供了有价值的参考。

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