绿色碳质材料协同电渗法处理软土的试验研究 English Version
Experimental study on synergistic electroosmotic treatment of soft soil with green carbonaceous materials
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摘要: 软土具有高含水率和低抗剪强度等特点，该类地质条件下地基处理施工难度大且施工周期长。为践行绿色地基处理理念，提高软土地基的电渗加固效果，本文使用不同尺寸的可循环碳质材料协同电渗法，采用自制模型箱进行七组室内试验。试验过程中，监测土体的电流、排水量、抗剪强度等参数的变化规律，同时，采用SEM扫描电镜获取土体的微观结构图片，利用图像处理软件PCAS分析软土加固后的土体孔隙特征变化，从微观角度探究软土的电渗加固机理。结果表明：通过掺入可循环碳质材料，能够有效改善软土的电渗排水效果，碳质材料与土颗粒形成的复合导电体在提高电流强度的同时，能够大幅提升土体承载力。相对对照组，掺入可循环碳质材料后，排水量提高约17.28 % ~ 79.77 %，阳极附近的土体承载力提高约20 kPa ~ 60 kPa。此外，本文创新性地提出生态效能地基评价因子的概念，可以正确评估优化后的协同电渗法对环境的影响，且与可循环碳质材料的尺寸成反比。
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关键词:
- 软土地基 /
- 可循环碳质材料 /
- 电渗加固 /
- 生态效能地基评价因子 /
- 环境评估
Abstract: Soft soil has the characteristics of high water content and low shear strength. Under such geological conditions, the construction of foundation treatment is difficult and the construction period is long. In order to practice the concept of green foundation treatment and improve the effect of electro-osmotic consolidation of soft soil foundation, seven groups of laboratory tests were carried out by self-made model box using the electro-osmotic synergistic consolidation with recyclable carbonaceous materials. During the test, the variation regulations of the current, water discharge, shear strength and other parameters were monitored. At the same time, the microstructure pictures of the soil were obtained by SEM scanning electron microscope. The changes of soil pore characteristics after the reinforcement were analyzed by image processing software PCAS, and the mechanism of consolidated soil was explored from the microscopic point of view. The test results showed that the electro-osmotic drainage effect can be effectively improved by adding recyclable carbon materials, and the composite conductor formed by carbon materials and soil particles could significantly improve the current transport capacity and bearing capacity. Compared with the control group, water discharge increased by 17.28% ~ 79.77 % after adding the recyclable carbon material, and the bearing capacity near the anode increased significantly by about 20 kPa ~ 60 kPa. In addition, the concept of ecological efficiency foundation evaluation factor was presented innovatively, which could correctly evaluate the impact of the optimized electro-osmotic method on the environment, and is inversely proportional to the size of the material.
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