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针对云南典型红土,采用浸泡方法,考虑酸液浓度、浸泡时间、干密度和含水率的影响,制备酸污染红土试样,开展酸污染红土的直剪试验,研究浸泡对酸污染红土抗剪强度的影响。试验结果表明:酸液浸泡红土的抗剪强度较浸泡前显著减小。随浸泡时间延长,红土的抗剪强度总体呈减小趋势;浸泡时间较短,抗剪强度显著下降;随浸泡时间延长,抗剪强度有所增加;随浸泡时间进一步延长,抗剪强度缓慢下降。随初始含水率增大和干密度增大,酸液浸泡红土的抗剪强度呈先增大后减小的趋势;低含水时,抗剪强度有所增加;高含水时,抗剪强度有所减小。浸泡对酸污染红土抗剪强度的影响效果可以用强度影响系数来反映,其影响实质在于浸泡过程中水的软化、酸的侵蚀以及盐的凝聚溶解等作用的综合结果。
Aimed at the typical lateritic soils of Yunnan Province, acid-contaminated laterite samples were prepared by immersion method and acid concentration, immersion time, dry density and water content were taken into account. The shear tests of acid-contaminated laterite were carried out. Impact. The test results show that the shear strength of acid-soaked soils significantly decreases compared with that before soaking. With the soaking time, the shear strength of laterite tends to decrease; the immersion time is short, the shear strength is significantly decreased; with the soaking time, the shear strength increases; With the immersion time further, the shear strength decreases slowly . With the increase of initial water content and dry density, the shear strength of acid soaking laterite first increases and then decreases; shear strength increases with low water content; shear strength decreases with high water content small. The effect of soaking on the shear strength of acid-contaminated laterite can be reflected by the influence coefficient of strength. The effect of soaking is essentially the result of the softening of water, the erosion of acid and the cohesion and dissolution of salt in the soaking process.