【作者】 兰常玉；

【导师】 张向东；

【作者基本信息】 辽宁工程技术大学 ， 岩土工程， 2004， 硕士

【摘要】 长期以来黄土对水的特殊敏感性一直是黄土力学特性研究的中心，而实际增湿及其特性的研究是目前黄土力学的首要任务。本文从黄土湿陷速率的角度出发，认为黄土湿陷性大小的评定问题属于模糊范畴，因此以模糊理论为研究工具，对黄土湿陷性的评价进行了研究。在宏观角度上：（1）以辽宁阜新地区黄土试样的固结试验数据为分析对象，得到了黄土湿陷速率与含水量的关系曲线呈单峰状态的结论，即黄土湿陷速率在土体浸水初期会随着含水量的增加而增大，但当含水量超过某一数值趋于饱和含水量时，黄土湿陷速率却随着含水量的增加而减小；（2）立了黄土湿陷速率与压力之间关系的数学模型，得出了黄土湿陷速率随压力的增大而呈阶越增长的结论以及阜新地区湿陷性黄土的本构关系；（3）提供了在时间、含水量及压力等因素共同作用下，对黄土湿陷性进行综合评价的方法。在微观角度上：（1）从孔隙率变化规律出发，指出有效孔隙的变化规律是湿陷速率变化规律的微观表现；（2）利用有限制的扩散凝聚（DLA）模型,得出了有效孔隙分布密度与时间的函数关系式。更多还原

【Abstract】 In a long time, it is always the center of loess mechanics that the sensibility of loess to water, now the study which water is increased in practice is a chiefly job.From the point of view of the collapsible speed of loess, the problem of evaluating the collapsibility of loess should belong to the fuzzy category. So the evaluation of loess collapsibility was researched by the theory of fuzzy in the field of collapsible speed. In the macroscopical field: (1) The relationship between the moisture and the speed of average collapse was attained, that is , the speed of average collapse will increase with increasing of the moisture at first,but it will decrease when the value get to certain max with increasing of the moisture; (2) The model of relationship between the pressure and the speed of average collapse was established on the basis of experiment. The conclusion of that the speed of average collapse bouncing increase with increasing of the pressure was attained and the relationship between stress and distortion was established ; (3) The method of synthetical evaluation for collapsibility loess under the effect of time, pressure and moisture was offered. In the microcosmic field: (1) From the disciplinary of hole in loess diversification, that the disciplinary of effective hole in loess diversification is the microcosmic incarnating of the disciplinary of collapsible speed diversification was pointed; (2) The function between distributing density of effective hole and time was established by DLA.更多还原