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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。
The change of moisture content has an important influence on the seismic subsidence characteristics of loess, and the influence of its variation on the evaluation and prediction of the loess field seismic subsidence is of great significance. A series of dynamic and triaxial tests of undisturbed loess with different moisture content were carried out to analyze the changing rules of loess seismic subsidence due to the change of moisture content. The evaluation results of the subsidence caused by the loess samples and the different water cut conditions Under the seismic collapse prediction results. The results show that the seismic collapse coefficient increases with the increase of dynamic stress and soil moisture content, and the critical dynamic stress of the earthquake subsidence decreases with the increase of water content. The seismic nature of loess with different traits is quite different. The soil water content of this soil is less than 5 %, No subsidence occurs under the seismic action of VII and VIII degrees. After the water content is above 5%, a seismic collapse will occur under the action of VIII degree earthquake.