考虑颗粒破碎的粗粒土临界状态弹塑性本构模型-岩土工程学报.PDF

32 卷 8 期 岩 土 工 程 学 报 Vol.32 No.8 2010 年 .8 月 Chinese Journal of Geotechnical Engineering Aug. 2010 虑颗粒破碎的粗粒土临界状态弹塑性本构模型 1，2 1，2 孙海忠 ，黄茂松 (1. 同济大学岩土及地下工程教育部重点实验室，上海 200092；2. 同济大学地下建筑与工程系，上海 200092) 摘 要：研究了颗粒破碎对硬化准则和剪胀性的影响，提出了修正后的硬化准则和剪胀方程，并基于有效塑性功的概 念，建立了考虑颗粒破碎的粗粒土临界状态弹塑性本构模型。将所提出的模型与未考虑颗粒破碎的模型用于不同围压 下粗粒土室内大三轴试验的数值模拟，对比分析表明：模型计算结果与试验实测结果更为一致，能较好地描述低围压 和相对中高围压下的强度和变形特性，得出颗粒破碎导致粗粒土强度降低，压缩变形增大，并利用离散单元法模拟一 维压缩颗粒破碎试验对该结论进行了验证。 关键词：粗粒土；颗粒破碎；硬化准则；剪胀性；本构模型 中图分类号：TU411 文献标识码：A 文章编号：1000 –4548(2010)08 –1284 –07 作者简介：孙海忠(1979 – )，男，江苏高邮人，博士研究生，从事粗粒土的弹塑性模型研究及离散元数值分析。E-mail: sunhaizhong@163.com 。 Critical state elasto-plastic model for coarse granular aggregates incorporating particle breakage SUN Hai-zhong1, 2, HUANG Mao-song1, 2 (1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China) Abstract: The influences of particle breakage on hardening rule and dilatancy are studied, and the modified equations are proposed respectively. When the breakage energy is introduced into the hardening rule and dilatancy of coarse granular aggregates, a new elasto-plastic constitutive model considering the particle breakage is developed based on the concept of effective plastic work. The numerical simulations for the various confining pressure tests are performed in a developed program by use of the