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随着工业化进程的加快、环境污染的加剧,工程建设中遇到污染土问题增多,这使得污染土研究成为环境岩土工程领域中的一个崭新课题。酸碱污染使地基土改性,因此,酸碱污染土的污染机制研究、勘察评价和处理措施,对保证建筑工程质量,保护环境有重要意义。通过人工方法制备了4种不同浓度的酸、碱污染土试样,通过三轴固结不排水试验研究了不同浓度酸碱污染土应力应变特性以及对孔隙水压力的影响。试验表明:所研究的污染土应力–应变关系曲线的形态随着污染物的不同而发生改变,随着酸浓度的增大,酸污染土软化特性愈显著;而随着碱浓度的增大,碱污染土的软化特性愈不明显,呈塑性破坏。
With the acceleration of industrialization, intensified environmental pollution and increased pollution of soil encountered in construction, the research on contaminated soil has become a brand new topic in the field of environmental geotechnical engineering. Acid-alkali pollution makes the foundation soil modified. Therefore, the research on pollution mechanism of acid-base contaminated soil, survey and evaluation and treatment measures are of great significance for ensuring the quality of construction projects and protecting the environment. Four kinds of acid and alkali contaminated soil samples were prepared by artificial methods. The stress and strain characteristics of acid and alkali contaminated soil with different concentrations and the influence on pore water pressure were studied by triaxial consolidation undrained test. The results show that the morphology of the stress-strain curve of contaminated soil changes with the different pollutants. With the increase of acid concentration, the softening property of acid-contaminated soil is more significant. With the increase of alkali concentration, The softening characteristics of alkali-contaminated soil are less obvious, plastic ductile.