【摘要】 含水率变化对黄土的震陷特性有着重要影响,其影响变化规律对黄土场地震陷的评价和预测工作具有重要意义。通过开展一系列不同含水率条件下原状黄土的动三轴试验,分析了含水率变化对黄土震陷的影响变化规律,并借此给出采样黄土场地震陷性的评价结果和不同含水率条件下的震陷性预测结果。研究表明:震陷系数随动应力和土样含水率增加而增大,震陷临界动应力随含水率的增加而减小;不同性状黄土震陷性质差别较大,该场地土含水率≤5%时,在VII,VIII度地震作用下基本不发生震陷;含水率>5%以后,在VIII度地震作用下将产生震陷灾害。更多还原

【Abstract】 The seismic subsidence of loess is greatly affected by the changes of water content and the corresponding influence is valuable for the evaluation and predication of the seismic subsidence of loess site. A series of dynamic triaxial tests of undisturbed loess under different water contents were carried out. The influence of water content on the seismic subsidence of loess was analysed and the evaluation and predication of the seismic subsidence of the sampled loess site were presented. The results showed that the coefficient of loess seismic subsidence increased with the increasing of the dynamic stresses or water contents. The critical dynamic stress of seismic subsidence decreased with the increasing of water contents. The seismic subsidence of loess with different physical properties was significantly different. For the loess site with water content no more than 5%,the seismic subsidence would generally not occur under the earthquake intensities of VII or VIII,while for that with the water content larger than 5%,the seismic subsidence would occur under earthquake intensity of VIII.更多还原