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目前粉煤灰非饱和特性的工程描述多参考与其粒经类似的粉土,但两者由于颗粒级配和颗粒微观结构的不同,其工程非饱和特性方面的差异必然是存在的,目前尚没有见到这方面的研究成果。本文针对粉煤灰在非饱和特性研究方面的不足,首先采用Fredlund土水特征曲线测量仪试验研究了不同干密度、不同含水率等条件下粉煤灰土水特征曲线特征与基质吸力变化规律,探讨了粉煤灰脱湿过程与吸湿过程的非饱和性质差异。在此基础上,通过数值计算方法,分析探讨了粉煤灰非饱和特性对工程渗流、变形、稳定等计算分析成果的影响及程度。研究结果为:(1)在进行非饱和渗流计算时,采用粉煤灰的实测土水特征曲线才能较好的保证计算结果的可靠性,采用计算程序库中相应土的土水特征曲线来替代粉煤灰对结果将产生较大影响;(2)在进行稳定计算和应力应变分析时,用相应粉土来替代粉煤灰的土水特征曲线对计算结果整体影响不大,认为采用计算程序库中相应土的土水特征曲线来替代粉煤灰是可行的。
At present, the engineering description of the unsaturated characteristics of fly ash refer to the silt similar to that of its grain, but due to the difference of the grain size distribution and the microstructure of the grain, the differences in the unsaturated characteristics of the project inevitably exist. See the research results in this area. In this paper, the weakness of fly ash in the unsaturated nature of the study, first of all, the use of Fredlund soil-water characteristic curve tester experimental study of different dry densities, different moisture content under the conditions of fly ash soil water characteristic curve and the variation of matrix suction Differences of Unsaturated Properties of Fly Ash Desorption Process and Absorption Process. On this basis, the influence and degree of the unsaturated characteristics of fly ash on the calculation and analysis results of seepage, deformation and stability of the project are analyzed and discussed through numerical calculation method. The results are as follows: (1) In the calculation of unsaturated seepage flow, the measured soil-water characteristic curve of fly ash can better ensure the reliability of the calculation results. The soil-water characteristic curve of the corresponding soil in the calculation program library is used instead Fly ash will have a greater impact on the results; (2) In the process of stability calculation and stress-strain analysis, the soil-water characteristic curves with the corresponding silt instead of fly ash have little effect on the calculation results. It is considered that the calculation program It is feasible to replace the fly ash with the soil-water characteristic curve of the corresponding soil in the reservoir.