长江入海口原状土动剪切模量预测方法探究

为探究同一类原状土在各应变范围内动剪切模量G随土层深度H的变化规律，对长江入海口处同一钻孔自地表至基岩深度范围内原状粉质黏土与粉土展开系列共振柱试验。试验发现：原状粉质黏土与粉土在各应变范围内G均随H的增加而规律性增加，最大动剪切模量Gmax随H的增加而线性上升；G衰减关系随H的增加呈现规律性降低。试验结果表明：原状土G与土层深度H存在一定相关，据此提出了分别基于土层深度H和Hardin模型的G预测方法，用以预测各类原状土在不同深度下的Gmax及其在各应变范围内的G。通过3种预测方法的对比分析，得出基于土层深度H的G预测方法最具优势，并且通过对渤海海域原状土数据的重新处理进一步验证了该方法的适用性。

Dynamic shear modulus prediction method of undisturbed soil in the estuary of the Yangtze River

A series of resonant column tests was carried out on undisturbed silty clay and silt in the same borehole from surface to bedrock in the estuary of the Yangtze River. Then the variation law of dynamic shear modulus G with soil depth H was explored within various strain ranges in the same undisturbed soil. It was found that the G in the various strain ranges of undisturbed silty clay and silt increased regularly with the increase of H. Meanwhile, the maximum dynamic shear modulus Gmax linearly increased with the increase of H, whereas the attenuation relationship of G decreased with the increase of H. The experimental results showed that the G of the undisturbed soil was correlated with the soil depth H. Based on the soil depth H and Hardin model, the G prediction method was put forward accordingly to predict the Gmax of each kind of undisturbed soil at different depths and their G within various strain ranges. According to the comparison and analysis of three kinds of G prediction methods, the G prediction method based on soil depth H was the most advantageous. In addition, the applicability of the method was further verified by re-processing the data of undisturbed marine soil in Bohai sea area.