乙酸和碳酸对粘土土工性状影响的试验

对加入不同浓度乙酸和碳酸的土样做室内土工试验,并进行机理分析。试验结果表明:乙酸根、碳酸根通过改变粘土颗粒双电层的厚度、极性水分子的吸附量,使土的结构发生凝聚或分散,引起压实粘土的塑性、渗透性等变化。其中,乙酸根是通过溶解粘土矿物中的铝,提高了粘土的渗透系数和塑性指数;而碳酸根是以其与金属离子发生化学反应生成难溶性碳酸盐的方式,降低了粘土的渗透系数。这为判断垃圾堆放场粘土衬垫工程的稳定性提供了依据。

Experimental study on effect of acetic acid and carbonic acid on clay's geotechnical behaviors

The mechanism study is performed based on indoor geotechnical experiment by injecting acetic acid and carbonic acid with different concentrasion to soil samples and according to the results of the soil mechanics and the correlative theory.The conclusions are that by changing thickness of electric double layer of soil grain diffusion and adsorbability of polar water molecular,the concentration of acetate or carbonic acid makes soil particles ag-glomerate or disperse,and result in variation of plasticity and permeability of the compacted clay;By dissolving aluminium in clay mineral,acetic acid increases the clay permeability and plasticity index;There is a chemical re-action of the carbonic acid with the metal cation which can generate insoluble carbonates,resulting in decrease of the clay liner permeability.It gives evidences for the clay liner stability.