【作者】 魏迎奇； 田继雪； 蔡红； 严俊；

【Author】 Wei Ying-qi;Tian Ji-xue;Cai Hong;Yan Jun;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research;

【机构】 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室；

【摘要】 目前粉煤灰非饱和特性的工程描述多参考与其结构性质类似的粉土,但两者由于颗粒级配和颗粒成分的不同,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、不同含水量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。研究认为:(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。更多还原

【Abstract】 The engineering description of the un-saturated characteristics of fly ash refers to the silt with the similar structural properties.In fact,because of the difference grain size distribution and particle composition,there are inevitable differences on unsaturated engineering characteristics between them.However,there are few researches on this aspect.Hence,in this paper,the Fredlund soil-water characteristic curve(SWCC) test model is firstly chosen to study the soilwater characteristic curve and the matrix suction of fly ash under the conditions of different dry density,water content and so on.And the un-saturated character differences of flay ash between dehumidification process and moisture absorption are discussed.On this basis,the influence of the un-saturated characteristics of fly ash on the calculation and analysis results of engineering seepage,deformation is also discussed by using numerical calculation method.The following results are obtained:① A more reliable result will be get by using the measured SWCC of fly ash in the unsaturated seepage calculation.There will be a great influence to the result if use the corresponding SWCC in the library;② in the stability calculation and stress strain analysis,the impact of using the SWCC of the similar silt is not so big then SWCC of fly ash can be replaced.更多还原