摘要
为预测土工袋加固后软土地基的变形特性,采用弹塑性有限元法对某一土工袋加固后的软土地基承载力试验进行了模拟,将袋子张力的作用等效为附加应力作用在土骨架上,即在修正Camclay模型中将土工袋的黏聚力cT转换为土性参数σ0,从而可以把土工袋加筋土当成素土来计算。计算结果表明:该方法将土工袋加筋原理与有限元算法有机结合,较采用杆单元模拟土工袋的计算方法简单;数值模拟计算值与试验实测值(变形、土压力、孔隙水压力)基本一致,验证了该土工袋数值模拟方法的合理性。
In order to predict the deformation properties of soilbag-reinforced soft foundations,the numerical simulation of loading tests on a soilbag-reinforced foundation is performed by means of the elasto-plastic FEM.In this method,the action of tension of the soilbag is equivalent to the additional stress on the soil skeleton,that is,the cohesion cT of the soilbag in the modified Cam-clay model is transformed into soil parameter σ0.Thereby,for calculation,the soilbag-reinforced foundation can be regarded as plain soils.The proposed method combines the principles of soilbag reinforcement with the FEM and is simpler than the method for simulating soilbags by means of bar units.The predicted values agree with the observed ones.
出处
《水利水电科技进展》
CSCD
北大核心
2012年第1期78-82,共5页
Advances in Science and Technology of Water Resources
基金
高等学校博士学科点专项(2010515911)
江苏高校优势学科建设工程项目(苏政办发(2011)6号)
