岩质边坡开挖卸荷非线性弹性本构模型研究  

Research on Unloading Nonlinear Elastic Models Related to the Rock Mass Slope

作　　者：黄宜胜[1] 李建林[1] 张立君[1,2] 盛玉国[2] 郭建新[2] 黄永金[2] 

机构地区：[1]三峡大学土木水电学院,湖北宜昌443002 [2]湖北省漳河工程管理局,湖北荆门448156

出　　处：《中国农村水利水电》2009年第7期76-79,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金西部能源计划项目(90610029)

摘　　要：基于三峡永久船闸高边坡岩体开挖卸荷物理模拟试验结果，假定岩体卸荷应力～应变曲线为双曲线型非线性弹性曲线，据此提出了岩质边坡开挖卸荷双曲线型非线性弹性本构模型，克服了常规弹塑性本构模型假定岩体卸荷阶段应力应变关系为线弹性的缺陷。该模型变形模量采用应力应变曲线的切线模量，其随着岩体应力水平的降低而降低，体现了岩体在卸荷作用下的变形模量的衰减特征。该模型对三峡永久船闸高边坡岩体开挖卸荷物理模拟试验应力应变曲线的拟合程度非常高，表明该模型在理论上可行，同时工程实例的分析也表明该模型在应用上可行。Based on unloading tests of high slopes of permanent ship locks in Three Gorges Project and assuming the unloading stress -strain curves of rock mass is hyperbola nonlinear elastic curve, hyperbola nonlinear elastic unloading constitutive relationship is educed, which overcomes the shortcoming that ordinary elastic-plastic model assumes. The model uses the tangent modulus of stress -strain curve which is reduced along with rock mass stress reduced, and incarnates the attenuation characteristic of distortion modulus of unloading rock mass. When the model is fitted on unloading tests of high slope of permanent ship lock in Three Gorges Project, the fitting correlation coefficient is quite high. So it is feasible in theory. And it is feasible in application.

关 键 词：岩体卸荷 双曲线型 非线性弹性 本构模型 

分 类 号：O242.21[理学—计算数学]