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通过室内模拟试验的方法,对受两种碱溶液NaOH和NH3.H2O质量分数分别为4.5%,9%,13.5%,18%侵蚀的粉土进行了物理力学指标的测定,总结了各项指标与侵蚀介质的类型、含量之间的变化规律:污染后土样的基本物理性质和压缩性都发生了变化。比较了NaOH和NH3.H2O溶液侵蚀下土样的各项指标,NaOH对于土样的影响要强于NH3.H2O。通过微观分析表明,孔隙面积占图像总面积的比例在中孔时达到峰值,并以中孔为分界值,前半段曲线呈升高趋势,后半段呈降低趋势;同等条件下NH3.H2O污染土较NaOH污染土具有更多的颗粒内孔隙;最后结合土体的物理力学性质和微观结构研究结果,阐述引起土性发生改变的原因,揭示了污染土的侵蚀机理。
Through the indoor simulation test, the physical and mechanical indexes were measured on the silts that were affected by the alkali solution NaOH and NH3.H2O 4.5%, 9%, 13.5%, 18% respectively. And the type and content of erosion medium. The basic physical properties and compressibility of soil samples changed after pollution. Compared with the soil samples under the erosion of NaOH and NH3.H2O, the influence of NaOH on soil samples was stronger than that of NH3.H2O. The microscopic analysis shows that the ratio of pore area to total area of the image reaches the peak value in the mesopore, and the mesopore is the cut-off value. The curve of the first half of the curve shows an increasing trend and the second half of the graph shows a decreasing trend. Under the same conditions, NH3.H2O pollution The soil contains more intragranular pores than the NaOH-contaminated soil. Finally, combining with the physical and mechanical properties of the soil and the microstructure research results, the reasons for the change of the soil properties are expounded and the erosion mechanism of the contaminated soil is revealed.