太原东山黄土静力与动力性质的分析研究.pdf

太原理工大学硕士研究生学位敝Y 63006 G 太原东山黄土静力与动力性质研究摘要本文通过变含水量条件下的室内试验,对太原东山黄土的静力与动力性质进行了研究。在分析了静动三轴、湿陷试验的结果数据后,发现随着含水量的增加,东山黄土的静本构关系从软化型变为硬化型,动本构关系从直线型变为双曲线型,曲线形态都越来越平滑。黄土的静动强度都将随着含水量的增加而减小,变化趋势均符合指数函数。静动摩擦角随含水量的增加变化都不大,且两者非常接近,可近似认为黄土的摩擦角是定值。静动凝聚力随含水量的增加而减小, 也符合指数函数。在低含水量条件下,动凝聚力要比静凝聚力小,使得太原东山黄土的动强度低于静强度,但随着含水量增加,动强度将逐渐接近静强度甚至超出。相同压力下, 东山黄土的湿陷量将随含水量的增加而减小;同一固结压力条件下,同?动应力所对应的振陷量将随着含水量的增加而增加。振陷和湿陷系数可以通过含水量建立它们之间的关系。太原理:[人学硕士研究生学位论文本次研究结果充分说明,研究在不同含水量下黄土的动静力性质是研究水对黄土影响的一个行之有效的办法。关键词:湿陷性黄土,含水量,本构关系,动强度,静强度, 振陷太原理工大学硕士研究生学位论文 STUDY oN STATIC AND DYNAMIC PRoPERTlES oF TAIYUAN DoNGSHAN LoESS ABSTRACT This paper ismain to study the staticand dynamic properties ofTaiyuan Dongshan loessby thelaboratory tests under different water analyzing the results of static anddynamic triaxialtests,we discover that the static constitutive es hardening shape from softening shape and thedynamic es hyperbolic model from linear model and the curve shapes for both conditions e smooth withtheincreasing of water contents The staticanddynamic strengths decrease withthe water content increasing,and their relationship trends accord exponential staticanddynamic frictionangles vary littlewith thechange ofwater content,and they are III 太原理工火学硕士研究生学位论文 frictionangle ofloessis a constant staticand dynamic cohesions decrease With the increasing of water content,and they accord exponential function lower water content,the dynamic cohesion issmaller than thestatic ones,in turn,the dynamic strength ofTaiyuan Dongshan loess is lower than withtheincreasing ofwater content,dynamic strength will beclose tostaticstrength even collapse settlementofDongshan loess decreases and theseismic subsidence according tothe same dynamic stress increases with the increasing of water content when the consolidation pressure is relationship between coefficientsofcollapsibility andseismic subsidence carlbe setup through water conten