考虑剪胀性与状态相关的钙质砂双屈服面模型研究  

STUDY ON A TWO-YIELD SURFACE MODEL WITH CONSIDERATION OF STATE-DEPENDENT DILATANCY FOR CALCAREOUS SAND

作　　者：孙吉主[1] 罗新文[1] 

机构地区：[1]武汉理工大学土木工程与建筑学院

出　　处：《岩石力学与工程学报》2006年第10期2145-2149,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40402024);中国科学院岩土力学重点实验室开放研究基金资助项目(Z110506)

摘　　要：根据重塑和原状钙质砂压缩特性的不同,提出颗粒破碎会引起原状钙质砂的附加孔隙比增量。在临界状态土力学的理论框架内,通过引入状态参数和帽盖屈服面,建立1个考虑颗粒破碎影响的钙质砂的弹塑性本构模型,在较大密度和应力水平范围内对1种土只需采用1组材料参数。通过与三轴试验结果比较,模型能较好地描述钙质砂的强度和剪胀性。Based on the different compression behaviors of natural and reconstituted calcareous sand, it is presented that the additional void ratio can cause particle breakage of natural calcareous sand. Within the frame work of critical state soil mechanics, an elastoplastic model including the state parameters and cap yield surface is developed. A unique set of parameters for a given sand is needed over a full range of densities and stress levels. By making comparisons of predictions with triaxial test, it is demonstrated that the model provides satisfactory simulation of strength and dilatancy of calcareous sand.

关 键 词：土力学 颗粒破碎 状态参数 剪胀性 钙质砂 

分 类 号：TU41[建筑科学—岩土工程]