饱和粘土循环动力分析边界面模型的积分算法  

Integration Algorithm of Bounding-surface Model for Analyzing Cyclic Behaviors of Saturated Clay

作　　者：张福征[1] 胡存[1] 刘海笑[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《港工技术》2012年第6期60-63,共4页Port Engineering Technology

基　　金：国家自然科学基金(50979070)

摘　　要：基于运动硬化准则的新型边界面塑性模型,能够预测循环载荷作用下饱和粘土的动力响应,该模型的数值积分格式是合理评估海洋环境下大圆筒结构等近海工程结构承载性能和动力响应的保证。采用基于SMP准则的变换应力法,建立能考虑土体拉伸特性的边界面模型,根据广义梯形法则提出该模型的积分算法,模拟饱和粘土的三轴拉伸试验和动三轴试验,数值结果与土工试验数据吻合较好。Based on kinematic hardening rule, the bounding-surface plasticity model can be used to predict the dynamic response of saturated clay subject to cyclic loading. The numerical integration of the model is regarded as the means to evaluate offshore marine structures ,such as large-diameter cylindrical structure, the guarantee of bearing performance and dynamic response in the marine environment. The stress conversion method based on SMP rule is adopted to build a bounding-surface model which consider the tensile properties of the soil. Based on generalized trapezoidal rule, the integration algorithm of bounding-surface model is put forward to simulate the tri-axial tensile test and dynamic tri-axial test for the saturated soil. The simulation result basically accords with the geotechnical testing data.

关 键 词：边界面模型 循环载荷 广义梯形法则 积分算法 饱和粘土 

分 类 号：TU435[建筑科学—岩土工程] TU447[建筑科学—土工工程]