压实花岗土的单屈服面模型研究  

Study on single hardening model for compacted decomposed soil

作　　者：续建新 李光范[2] 夏小兵[2] 杨舒[2] 

机构地区：[1]中交水运规划设计院有限公司,北京100007 [2]海南大学建筑工程学院土木工程系,海南海口570228

出　　处：《水运工程》2009年第12期73-77,共5页Port & Waterway Engineering

摘　　要：在解决岩土工程问题的过程中,常常需要预测加载过程的变形和应力。采用数值方法,不仅可以解决上述岩土工程问题,甚至还可以解决更为复杂的问题。此外,为了得到较为准确的结果,还需要一系列的参数,如土的种类、密度、应力水平和应力路径等。为预测砂土特性,采用多种应力路径,利用Lade的单屈服面模型,进行了大量的试验研究。试验分析表明,在一定条件下砂的应力路径依赖其特性变化。利用Lade单屈服面模型计算结果与测试结果比较一致,但也出现了一些差异。应变的计算结果与测试结果的最大差异,表现在随应力增加的比例加载和应力路径方向上。Solutions of geotechnical engineering problems require predictions of deformation and stresses during various stages of loading. Powerful numerical methods are available to make such predictions even for complicated problems. To get accurate results, realistic stress-strain relationships of soil are dependent on a number of factors such as soil type, density, stress level and stress path. The use of Lade＇s single work-hardening model for predicting the sand response for a variety of stress-paths have been investigated and examined. The test and analyses results show that under certain conditions sand exhibits stress-path dependent behavior.The strains calculated from Lade＇s single work-hardening model are in reasonable agreement with those measured, but some discrepancies occur. The largest difference between the measured and the calculated strains occurs for proportional loading with increasing stresses and for stress-path directions.

关 键 词：应力水平 应力路径 Lade单屈服面模型 压实花岗土 

分 类 号：TU411.3[建筑科学—岩土工程]