片麻状花岗岩热黏弹塑性损伤蠕变模型及应用研究

发布时间：2018-04-01 13:29

本文选题：引水隧洞　切入点：片麻状花岗岩　出处：《土木工程学报》2017年08期

【摘要】：随着地下工程开挖深度的增加,高地温和高地应力将导致岩石产生显著的蠕变变形,为保证地下洞室的施工和运行安全,研究温度-应力耦合作用下岩石蠕变力学特性具有十分重要的作用。以新疆齐热哈塔尔水电站引水隧洞高温段的片麻状花岗岩为研究对象,通过不同温度和应力作用的三轴蠕变试验,获得了考虑不同温度影响的片麻状花岗岩的蠕变变形规律。基于蠕变试验成果,提出了考虑热力耦合作用的热黏弹塑性损伤蠕变模型,建立了片麻状花岗岩的热黏弹塑性损伤蠕变本构关系,推导了其一维和三维热黏弹塑性损伤蠕变方程,有效反演获得岩石的蠕变力学参数,揭示出典型高、中、低应力状态下温度对片麻状花岗岩蠕变特性的影响规律,研究成果为工程长期稳定性分析提供了重要理论依据。
[Abstract]:With the increase of excavation depth of underground engineering, high ground stress and high ground stress will lead to significant creep deformation of rock, in order to ensure the construction and operation safety of underground cavern. It is very important to study the creep mechanical properties of rock under the coupling of temperature and stress. The granitoids in the high temperature section of the diversion tunnel of the Qirehatal Hydropower Station in Xinjiang are taken as the object of study. Through triaxial creep tests at different temperatures and stresses, the creep deformation laws of granitic granites with different temperatures are obtained. A thermal viscoelastic-plastic damage creep model considering thermal coupling is proposed. The constitutive relation of thermal viscoelastic-plastic damage creep of granitic granites is established. The creep equations of one and three dimensional thermoviscoelastoplastic damage are derived. The creep mechanics parameters of rock are obtained effectively, and the influence of temperature on creep characteristics of granitic granites under typical high, medium and low stress states is revealed. The research results provide an important theoretical basis for the long-term stability analysis of engineering.
【作者单位】：山东大学岩土工程中心;中国电建集团华东勘测设计研究院有限公司;山东大学后勤保障部;
【基金】：高放废物地质处置地下实验工程前期科研项目(YK-KY-J-2015-25) 国家重点研发计划项目(2016YFC0401804) 国家自然科学基金(51279093)
【分类号】：TU45

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