修正双屈服面模型三维化在水泥砾质土中的应用
发布时间：2019-04-09 14:42
【摘要】：采用变换应力方法将空间滑动面破坏准则应用于修正双屈服面模型,使该模型合理三维化。在不增加新参数的情况下可描述水泥砾质土的力学特性,利用水泥砾质土三轴试验结果对三维化后的修正双屈服面模型进行初步验证。结果表明,在低水泥掺入比(wc≤5%)的条件下,三维化后的修正双屈服面模型能够较好地反映水泥砾质土应力~应变关系的软化现象,且充分体现了体变~应变关系在低围压下的剪胀性和高围压下的剪缩性;但当水泥掺入比wc为8%且围压为200 k Pa时,水泥砾质土的脆性显著增强,其剪胀性也十分显著,水泥砾质土达到峰值强度后呈现脆性破坏,导致该模型计算值与试验值误差较大。该研究成果可为水泥砾质土应用于高土石坝心墙料力学特性研究提供一定的技术支撑。
[Abstract]:The failure criterion of spatial sliding surface is applied to the modified double yield surface model by using the transformation stress method, so that the model can be reasonably three-dimensional. The mechanical properties of cement gravel soil can be described without adding new parameters. The modified double yield surface model of cement gravel soil is preliminarily verified by using the triaxial test results of cement gravel soil. The results show that under the condition of low cement admixture ratio (wc 鈮，
本文编号：2455267
[Abstract]:The failure criterion of spatial sliding surface is applied to the modified double yield surface model by using the transformation stress method, so that the model can be reasonably three-dimensional. The mechanical properties of cement gravel soil can be described without adding new parameters. The modified double yield surface model of cement gravel soil is preliminarily verified by using the triaxial test results of cement gravel soil. The results show that under the condition of low cement admixture ratio (wc 鈮，
本文编号：2455267
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