为了探究滇中引水隧洞围岩的蠕变特性,采用实时高温常规三轴试验系统开展岩石的力学性能和蠕变试验。在建立岩石蠕变本构模型的基础上,根据蠕变试验曲线的特点,提出了一种确定蠕变参数的方法,并分析了不同应力水平下蠕变参数的变化规律,构建了蠕变参数与应力的关系。最后将各蠕变参数与应力之间的表达式代入蠕变本构模型中,得到修正的蠕变本构模型。结果表明:建立的蠕变模型不仅准确反映了衰减和稳定蠕变阶段的蠕变特征,而且克服了传统模型难以描述加速蠕变的缺点。同时,该方法确定的蠕变参数不仅可以反映应力对蠕变参数的影响,还可有效反映应力状态对蠕变变形规律的影响。
Abstract
Rock mechanics tests and creep tests were performed by using real-time high temperature conventional triaxial test system to probe into the creep characteristics of surrounding rock of water diversion tunnel in central Yunnan Province. On the basis of establishing the rock creep constitutive model, a method for determining the creep parameters is proposed according to the characteristics of creep test curve. The relationship between creep parameters and stress is established by analyzing the variation law of creep parameters under different stress levels. Finally, the modified creep constitutive model is obtained by substituting the expression between each creep parameter and stress into the creep constitutive model. Results demonstrate that the established creep model not only reflects the creep characteristics of decay and stable creep stages accurately, and also overcomes the deficiency of traditional model in describing accelerated creep. Moreover, the creep parameters determined by the proposed method reflect the influence of stress on creep parameters and also the influence of stress state on the regularity of creep deformation.
关键词
隧洞围岩 /
力学性能 /
蠕变试验 /
蠕变参数 /
应力状态 /
滇中引水隧洞
Key words
surrounding rock of tunnel /
mechanical properties /
creep test /
creep parameters /
stress state /
Central Yunnan Water Diversion Tunnel
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基金
云南省重大科技专项计划项目(202102AF080001)
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