一种胶凝砂砾石坝坝料非线性K-G-D本构新模型  

A new type of nonlinear K-G-D constitutive model for CSG material

作　　者：蔡新[1,2,3] 杨杰[1,3] 郭兴文[2] 宋小波[2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学力学与材料学院,江苏南京210098 [3]河海大学水利水电学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2014年第6期491-496,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51179061);高等学校博士学科点专项科研基金(博士生导师类)(20100094110014);国家"十二五"科技支撑计划(2012BAD10B02)

摘　　要：基于胶凝砂砾石坝坝料大三轴试验改进非线性解耦K-G模型,提出一种可反映胶凝砂砾石坝坝料应变软化特性和剪胀特性的非线性K-G-D本构模型;结合试验结果及回归分析方法确定模型的体积模量、剪切模量、剪胀模量及其包含的重要参数;最后对非线性K-G-D本构模型进行了验证,得出数值模拟结果与试验采集的数据基本吻合,表明该模型可为胶凝砂砾石坝的计算分析及设计提供参考。Through a large-scale triaxial test, a new type of nonlinear K-G-D constitutive model, which can describe the strain softening and dilatancy of cemented sand and gravel （CSG） material, was developed based on the K-G constitutive model. The bulk modulus, shear modulus, dilatancy modulus, and other important parameters of the model were determined according to the test results and regression analysis. The nonlinear K-G-D constitutive model was verified. The results show that the calculated values agreed with experimental data, indicating that the model can provide references for the design and analysis of dams with CSG materials.

关 键 词：胶凝砂砾石坝坝料 大三轴试验 剪胀特性 本构关系 

分 类 号：TV321[水利工程—水工结构工程]