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Comparison of Environmental Impacts of Two Alternative Stabilization Techniques on Expansive Soil Slopes

机译：两种替代稳定技术对膨胀土斜坡环境影响的比较

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摘要

Two alternative techniques, the lime stabilization technique (LST) and the geogrid reinforcement technique (GRT), are both useful to stabilize expansive soil slopes, but their impacts on the environment need be further evaluated. Based on a case study, two techniques as well as their construction processes were introduced. The energy consumption and carbon dioxide (CO2) emissions were investigated by the life cycle assessment (LCA). The sensitivity analyses were carried out, including the lime content for LST, the reinforcement spacing for GRT, the embankment height, delivery distance, and treatment width for both techniques. From the LCA results, with the GRT, the energy consumption and CO2 emissions can be reduced by 7.52% and 57.09%, respectively. The main sources of two techniques are raw material production, soil transportation, and paving stage while the CO2 emissions of lime production are about 11.68 times of those of geogrid production. From the sensitivity analysis results, as the lime content of LST increases by 1%, the total energy consumption and CO2 emissions increase by 8.27% and 13.16%, respectively; as the reinforcement spacing of GRT increases by 0.05m, the total energy consumption and CO2 emissions increase by 1.63% and 0.69%, respectively; as the embankment height increases by 1m, the increase rates of energy consumption and CO2 emissions of LST are 1.68 and 1.61 times of those of GRT, respectively. In this project, when the embankment height is less than 10m, the geogrid technique has the advantages of energy-saving and emission-reduction. It was found that the GRT is not sensitive to the change of delivery distance and treatment width and significantly reduces the environmental impacts, especially in reducing the impact of global warming.
机译：两种替代技术，石灰稳定技术（LST）和地理纤维增强技术（GRT）既可用于稳定膨胀土斜坡，但它们需要进一步评估对环境的影响。基于案例研究，引入了两种技术以及其施工过程。通过生命周期评估（LCA）研究了能量消耗和二氧化碳排放量（CO2）排放。进行敏感性分析，包括LST的石灰含量，GRT的加强间隔，堤防高度，输送距离和两种技术的处理宽度。从LCA结果，随着GRT，能量消耗和二氧化碳排放量分别降低7.52％和57.09％。两种技术的主要来源是原料生产，土壤运输和铺路阶段，而石灰生产的二氧化碳排放量约为地质格栅生产的11.68倍。从敏感性分析结果，随着LST的石灰含量增加1％，总能耗和二氧化碳排放量分别增加了8.27％和13.16％;由于GRT的加固间隔增加0.05米，总能耗和二氧化碳排放量分别增加1.63％和0.69％;随着堤防高度增加1米，分别增加了LST的能耗和二氧化碳排放率为1.68和1.61倍的GRT。在该项目中，当路堤高度小于10米时，地质格栅技术具有节能和减排的优点。结果发现，GRT对输送距离和处理宽度的变化不敏感，并显着降低了环境影响，特别是在降低全球变暖的影响方面。

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  • 来源
    《Advances in civil engineering》 |2019年第14期|9454929.1-9454929.13|共13页
  • 作者

    Zhang Rui; Long Mingxu; Zheng Jianlong;

  • 作者单位

    Changsha Univ Sci & Technol Natl Engn Lab Highway Maintenance Technol Changsha 410114 Hunan Peoples R China|Changsha Univ Sci & Technol Sch Traff & Transport Engn Changsha 410114 Hunan Peoples R China;

    Changsha Univ Sci & Technol Sch Traff & Transport Engn Changsha 410114 Hunan Peoples R China;

    Changsha Univ Sci & Technol Natl Engn Lab Highway Maintenance Technol Changsha 410114 Hunan Peoples R China|Changsha Univ Sci & Technol Sch Traff & Transport Engn Changsha 410114 Hunan Peoples R China;

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