不同酸碱条件下黏性土的抗剪强度试验研究

Experimental Study on Shear Strength of Cohesive Soil under Different Acid and Alkali Condition

通过直接剪切试验研究了含不同浓度H_2SO_4和NaOH重塑污染土抗剪强度指标的变化规律及同一污染土在不同龄期作用下抗剪强度的变化情况。结果表明:随着H_2SO_4浓度的增大,污染土抗剪强度指标内摩擦角φ和黏聚力c都震荡增加;随着NaOH浓度的增大,污染土内摩擦角φ震荡增大,而黏聚力c减小;10%浓度H_2SO_4污染土和20%浓度NaOH污染土抗剪强度指标总体上随着龄期的增大而减小。

A change rule is researched for the shear strength parameters of remodeling polluted soil with different concentrations of H2SO4 and NaOH by means of direct shear test, including the change in shear strength of same polluted soil in varied ages. The results show that with the increase of the concentration of H2SO4, the shear strength parameters of the polluted soil increase choppily, such as internal friction angle φ and cohesion force c. However, with the increase in the concentration of NaOH, for the shear strength parameters of the polluted soil, the internal friction angle φ increases but cohesion force c decreases. For the polluted soil with 10 % H2SO4 or 20 % NaOH, shear strength parameters decrease with age increase.