摘要
基于岩体单轴应变非线性软化本构模型,采用全量理论将其推广,获得考虑中间主应力影响的复杂应力状态下的岩体等效应力和等效应变关系,由此对灌浆式预应力衬砌隧洞进行弹塑性分析.指出预应力作用下围岩可能处于弹性或弹塑性两种状态,给出了两种情况下围岩压力、塑性区半径及衬砌应力的解析计算式,得到了围岩产生塑性变形的临界灌浆压力,并结合某工程进行了具体分析.
According to the strain nonlinear softening constitutive model of rock, stress distribution laws of surrounding rock plastic zone of circular cavern with grouting prestress lining is analyzed. The paper points out that the surrounding rock has two different states, ie elastic state and elasto-plastic state. Different stress formulas are gained. The critical prestress leading to the yield zone firstly for the surrounding rock is introduced.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2006年第4期555-558,共4页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
山东省自然科学基金资助项目(Y2005A03)
关键词
应变非线性软化
预应力衬砌
弹塑性分析
strain nonlinear softening
prestress lining
elasto-plastic analysis
