摘要
作为垃圾填埋场防渗系统中常用的改性材料,膨润土可能对压实黏土中裂隙的形成产生重要影响,从而影响衬垫的防渗性能。为此,对膨润土改性黏土和天然黏土在干湿循环条件下裂隙扩展规律进行研究。结果表明,较宽的裂隙在湿化后不能完全愈合,干湿循环使土样产生了不可逆的变化。改性黏土在首次脱湿的裂隙面积率、长度比约为天然黏土的3倍和2倍,二次脱湿的裂隙面积率、长度比约为天然黏土的4倍和3.7倍。改性黏土二次裂隙的面积率、长度比约为一次裂隙的1.6倍和1.8倍。膨润土和干湿循环次数对裂隙宽度的影响相对较小。
As a common modified material of watertight system of waste landfill, bentonite may produce important influence on the fissures in compacted clay and further influence the watertight performance of cushion layer. The fissure development laws of the modified clay by bentonite and natural clay under dry - wet circulation are researched. The results show that wider fissures can not be completely recovered, the dry - wet circulation causes irreversible change of soil sample, the fissure area rate and length ratio of modified clay are 3 times and 2 times larger compared with natural clay during the first process of dehydration, and 4 times and 3.7 times compared with that during the second process of dehydration. The fissure area rate and length ratio of first fissure of modified clay are about 1.6 and 1.8 times of that of secondary fissure. The bentonite and the times of dry - wet circula- tion have a relatively less influence on the average width of fissures.
出处
《人民长江》
北大核心
2013年第1期86-89,共4页
Yangtze River
基金
国家自然科学基金资助项目(51008120)
武汉市青年科技晨光计划项目(201271031418)
湖北省杰出青年人才资助项目(2010CDA091)
