摘要
为了研究锚杆体系的受力应力应变过程,提高锚杆的锚固效果,结合三种摩阻力本构模型完全弹性本构,弹性-理想塑性本构,弹性-软化塑性本构,建立了锚杆微观分析模型,对锚杆与岩体的相互作用力学过程进行了讨论。对于完全弹性本构给出了沿轴向分布的应力、应变和摩阻力,以及给出理论上的极限作用力;弹性-理想塑性本构存在一定范围内的屈服阶段,得到了屈服范围内的应力、摩阻力分布表达式,给出了对应作用力的屈服范围;弹性-软化塑性本构条件下,随着作用力的增大摩阻力呈现三个阶段,即完全弹性阶段、软化阶段以及残余阶段,并分析对应的应力、应变、摩阻力和分布范围。本文是基于锚杆摩阻力的不同模型条件下的力学分析,对于实际中的材料力学行为需要更多的实验工作。
To study cable stress and strain process and increase cable anchoring effects,three theory models of frictional resistances including perfect elastic constitutive,elastic-perfect plasticity constitutive and elastic-soften constitutive are introduced and used to deduce the behavior equations of rock cable balance based on suggested model.For perfect elastic constitutive the axial stresses,strains and frictional resistances are analyzed and the distributions are expressed along the axial direction. The theoretical maximum force is provided. For elastic-perfect plasticity constitutive there is a part of yielding from the position of force. And also the axial stresses,strains and frictional resistances are analyzed and the yielding scope is presented. For elastic-soften constitutive as the force increases the frictional resistances appear as three stages that are elastic stage,soften stage,residual stage. Axial stresses,strains,frictional resistances and the scopes of different stages are analyzed. This paper 's conclusions are based on the conditions of different models. Practical materials mechanics behaviors may be tested by more experimental work.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第S1期91-95,共5页
Chinese Journal of Underground Space and Engineering
基金
合肥工业大学青年基金(2013HGQC)
国家自然科学基金(11102205)
关键词
锚杆
本构模型
理想塑性
软化
摩阻力
cables
constitutive model
perfect plasticity
soften
frictional resistances
