基于扰动理论的沈阳中粗砂本构模型

发布时间：2018-03-21 11:33

本文选题：沈阳中粗砂　切入点：三轴固结排水剪切试验　出处：《东北大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：针对沈阳地区中粗砂在不同围压下的三轴固结排水剪切试验,发现中粗砂的相对密实度对其强度和变形特性有重要影响.以相对密实度为自变量,提出了统一扰动度函数.基于试验数据,建立了统一扰动度与初始模量和峰值强度的函数关系,提出考虑扰动的D-C模型.将其预测结果与D-C模型预测结果及试验结果进行对比:D-C模型的预测值在D_D接近0时与试验结果比较一致;土体受到正扰动时,D-C模型预测的应力值较该修正模型偏大;而土体受到负扰动时,其预测的应力值又相对偏小,因此考虑扰动的D-C模型能更好地模拟沈阳地区中粗砂的强度及变形特性.
[Abstract]:In view of the triaxial consolidation and drainage shear tests of medium coarse sand under different confining pressures in Shenyang area, it is found that the relative compactness of medium coarse sand has an important influence on its strength and deformation characteristics. A unified perturbation degree function is proposed. Based on the experimental data, the functional relationship between the unified disturbance degree and the initial modulus and peak strength is established. The D-C model considering disturbance is put forward, and the predicted results are compared with those of D-C model and test results. The predicted value of D-C model is close to 0:00 when D _ S _ D is close to 0:00. When soil is under positive disturbance, the predicted stress value of D-C model is larger than that of the modified model, and the predicted stress value of soil is relatively small when the soil is subjected to negative disturbance. Therefore, the D-C model with disturbance can better simulate the strength and deformation characteristics of coarse sand in Shenyang area.
【作者单位】：东北大学资源与土木工程学院;中国建筑东北设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51204029) 中建股份科技研发项目(CSCEC-2014-Z-35)
【分类号】：TU43

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