考虑颗粒破碎影响的粗粒土本构关系.PDF

第31 卷第7 期 岩 土 力 学 Vol.31 No.7 20 10 年7 月 Rock and Soil Mechanics Jul. 20 10 文章编号：1000－7598 (20 10) 07 －2111 －06 考虑颗粒破碎影响的粗粒土本构关系 申存科，迟世春，贾宇峰 （大连理工大学 海岸与近海工程国家重点实验室，大连 116024） 摘 要：粗粒土在较大的应力条件下容易产生颗粒破碎现象，而现有的大多数模型都没有考虑剪切过程中的颗粒破碎。模型 将塑性功引入土体受力变形过程的能量方程中，推导得到土体流动法则。采用直线型屈服轨迹和非相关联流动法则，利用不 排水应力路径计算得到硬化函数，建立了一个考虑颗粒破碎的粗粒土本构模型。对比分析表明：该模型对粗粒土在各种围压 下的应力-应变和体应变计算结果与试验曲线吻合较好。 关 键 词：粗粒土；颗粒破碎耗能；非相关联流动；塑性功 中图分类号：TU 44 1 文献标识码：A A constitutive model for coarse granular soil incorporating particle breakage SHEN Cun-ke, CHI Shi-chun, JIA Yu-feng (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China) Abstract: Coarse granular aggregates are subjected to breakage during excessive stress changes. Most of the available constitutive models do not consider particle breakage during shearing. In the current model, the energy equation during shear deformation has been developed incorporating the plastic work; and the plastic flow rule is deduced. Adopting linear type yield locus and non-associated flow and hardening function derived from an undrained stress path, a constitutive model for coarse granular soil incorporating particle breakage is set up. It is shown that the proposed mo