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为探讨水环境对红黏土工程地质性质的影响,以桂林岩溶地区典型地段的红黏土为研究对象,对浸泡于不同浓度的HCl、NaOH、Fe(NO3)3和Al(NO3)3溶液中的试样进行固结实验。结果显示:(1)在HCl和NaOH溶液中浸泡后,红黏土的压缩模量都降低,压缩系数都增大,且溶液浓度越大其值降低或增大的幅度越大;(2)浸泡在NaOH溶液中的红黏土的压缩模量比浸泡在HCl溶液中的大,且压缩模量值随着溶液浓度的增加而减小,压缩系数则相反;(3)在Fe(NO3)3和Al(NO3)3溶液中浸泡后,红黏土的压缩模量会随着溶液浓度的增大而增大,压缩系数随着溶液浓度的增大而降低,且Fe(NO3)3溶液对红黏土的压缩性影响作用比Al(NO3)3溶液的大。
In order to investigate the influence of water environment on the engineering geological properties of red clay, the red clay soaked in different concentrations of HCl, NaOH, Fe (NO3) 3 and Al (NO3) 3 solutions Sample consolidation experiment. The results showed that: (1) After soaking in HCl and NaOH solution, the compressive modulus of red clay decreased and the compressibility increased, and the greater the concentration of solution was, the greater the value of decrease or increase was. (2) The compressive modulus of red clay in NaOH solution is larger than that in HCl solution, and the compressive modulus decreases with the increase of solution concentration and the compressibility coefficient is the opposite. (3) In the case of Fe (NO3) 3 and After soaking in Al (NO3) 3 solution, the compressive modulus of red clay will increase with the increase of solution concentration, and the compressibility decreases with the increase of solution concentration. The effect of Fe (NO3) 3 solution on red clay The compression effect is greater than that of Al (NO3) 3 solution.