The attenuation layer method has been considered an effective countermeasure to deal with excavated soils and rocks containing geogenic toxic elements like arsenic (As). The geosynthetic sorption sheet is a geosynthetic product that can be employed in the attenuation layer method applications as a sorption material. The sorption sheets used in the attenuation layer will be inevitably subjected to overburdened loads in the field. In this study, laboratory column experiments are conducted to evaluate the attenuation performance of the geosynthetic sorption sheets coated with hydrotalcite as sorbent against As under different overburden pressure conditions (10, 100, and 200 kPa). Experimental results showed that the cumulative sorption masses of As for 200 kPa cases are approximately 10.5–13.3 times greater than that for 10 kPa cases. Microstructure characterizations of the geosynthetic sorption sheet before and after loading were also detected. More compacted and involved fiber configuration as a result of higher loading produces a more effective contact between As solution and hydrotalcite. The presence of partial dissolution of hydrotalcite is confirmed through the chemical analysis of effluent. However, hydrotalcite would gradually become stable during continuous use.

衰减层法被认为是处理含有砷（As）等地源有毒元素的开挖土壤和岩石的有效对策。土工合成吸附片是一种土工合成产品，可在衰减层法应用中作为吸附材料使用。衰减层中使用的吸附片将不可避免地在现场承受过重的负载。在本研究中，进行了实验室柱实验，以评估涂有水滑石作为吸附剂的土工合成吸附片在不同上覆压力条件（10、100和200 kPa）下对砷的衰减性能。实验结果表明，200 kPa 情况下砷的累积吸附质量大约是 10 kPa 情况下的 10.5-13.3 倍。还检测了加载前后土工合成吸附片的微观结构特征。由于更高的负载量，纤维结构更加紧凑和复杂，使得砷溶液和水滑石之间的接触更加有效。通过流出物的化学分析证实了水滑石的部分溶解的存在。然而，水滑石在持续使用过程中会逐渐变得稳定。