上海第四纪土层邓肯--张模型的参数研究  

Parameters of Duncan-Chang model for hydrostratigraphic units in Shanghai City

作　　者：张云[1] 薛禹群[1] 吴吉春[1] 蒲晓芳[1] 刘运涛[1] 魏子新 李勤奋 

机构地区：[1]南京大学地球科学系,南京210093 [2]上海地质调查研究院,上海200072

出　　处：《水文地质工程地质》2008年第1期19-22,共4页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金重点项目(40335045)

摘　　要：本文根据大量土样的三轴排水试验得到上海各主要土层的邓肯一张模型参数，讨论了模型参数的取值特点和变化规律。试验结果表明，粘土的k值明显小于砂土，但粘土的kur／k要大于砂土，粘土的kur/k在4～10之间，砂土的kur/k在2～7之间；k与φ具有明显的相关关系，k随φ近似按指数曲线变化；破坏比Rr的取值多在0.70～0.85之间；nur／n与n没有明显的关系，n值大多在0．5～1.0之间。Many soil samples were acquired from different hydrostratigraphic units in Shanghai City. Drained consolidated triaxial tests were performed. Based on the tests, the parameters in Duncan-Chang model for the units in Shanghai City have been obtained and the change in the parameters has been discussed. The test results indicate that the value of k for clays is smaller than that for sands, whereas the value of kur/k for clays is greater than that for sands. The value of kur/k range within 4 -10 for clays and 2 - 7 for sands. The value of k is closely related to the value of internal friction angle φ and increases with φin exponential function approximately. The failure ratio Rf often changes between 0.70 and 0.85. And nur/n is nearly not related to n and n often changes within 0.5 - 1.0.

关 键 词：邓肯-张模型 模型参数 上海 地面沉降 

分 类 号：P642.116[天文地球—工程地质学]