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总览 评价 季明 1,* , 高峰 1, , 徐小丽 2, , 张宇 1, ( 1、 中国矿业大学理学院工程力学系; 2、 南通大学建筑工程学院; ) 摘要: 在西原体模型的基础上,通过引入弹簧的湿度膨胀系数,将湿度效应引入到模型中,推导了单轴应力状态下微分形式的粘
季明1,*, 高峰1,, 徐小丽2,, 张宇1,
(
1、中国矿业大学理学院工程力学系; 2、南通大学建筑工程学院; )
摘要:
在西原体模型的基础上,通过引入弹簧的湿度膨胀系数,将湿度效应引入到模型中,推导了单轴应力状态下微分形式的粘塑性本构方程。通过蠕变曲线和卸载曲线的分析,考虑了湿度效应的西原体模型当应力水平较低时为稳定蠕变,存在瞬时弹性、弹性后效和由湿度引起的粘性流动;当应力水平较高时为不稳定蠕变,存在瞬时弹性、弹性后效和由湿度和应力共同引起的粘性流动,该模型较全面地反映了岩石在湿度作用下的蠕变性质。
关键词:
膨胀岩;粘弹塑性;蠕变;卸载
JI Ming1,*, Gao Feng1,, Xu Xiaoli2,, Zhang Yu1,
(
1、Department of Mechanics, College of Science, China University of Mining and Technology; 2、The School of Architecture and Civil Engineering,Nantong University; )
Abstract:
The differential visco-elasto-plastic constitutive equation under the condition of uni-axial compression has been deduced based on the Nishihara rheological model with the help of considering the spring’s coefficients of thermal expansion. Through the analysis of creep and unloading curve, the Nishihara rheological model considering the effects of humidity is in a stable creep while the stress is low, which contains instantaneous elasticity、elasticity aftereffect and viscosity flow aroused by humidity . The model in a high stress is in an unstable creep, which also contains instantaneous elasticity、elasticity aftereffect, but the viscosity flow is aroused by the humidity and stress. The creep properties of rock under the humidity can be comprehensively reflected by this model.
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