文档介绍：
考虑温度对岩石力学参数影响时的损伤区
分析#
魏晨慧,朱万成**
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(东北大学资源与土木工程学院,沈阳 110819)
摘要:在深部采矿、核废料处置、地热开发等地下工程中,都涉及深部岩体在高温高压条件
下的稳定性问题。首先,基于损伤力学理论,使用最大拉应力准则和莫尔-库伦准则作为损
伤判断准则,建立了岩石损伤力学模型;其次,参考其他学者的试验结果,在损伤模型中进
一步考虑温度对岩石物理力学参数(包括弹性模量和单轴抗压强度、抗拉强度)的影响;最后,
通过数值模拟,研究不同热固耦合条件下损伤区的演化规律。模拟结果表明:(1)考虑温
度对力学参数的影响,孔边高温区域的弹性模型和强度均有所降低,导致孔壁周边的环向应
力成为拉应力,引起孔壁周边出现拉伸损伤区;(2)在试样内部已经存在损伤区特别是拉
伸损伤的情况下,温度变化导致的温度应力会引起损伤区周边应力集中加剧,促进已有损伤
区迅速扩展,热致裂效应会变得更加显著。
关键词:矿业工程;损伤区;热固耦合;高温;数值模拟
中图分类号:TD313
Analysis of damage zone with considering the influence of
temperature on rock mechanical properties
WEI Chenhui, ZHU Wancheng
(College of Resources and Civil Engineering, Northeastern University, ShenYang 110819)
Abstract: The deep rock mass stability under high temperature and high stress conditions is
concerned in underground engineering such as deep mining, nuclear waste disposal and
geothermal exploiting. Firstly, a damage model is established based on damage mechanics
principle, in which the maximum tensile stress criterion and the Mohr-Coulomb criterion are
utilized as damage thresholds. Next, the influence of temperature on physical properties
(including elastic modulus, pressive strength and tensile strength) based on
experimental test by other scholar is introduced. Finally, the model is numerically solved to
study the evolution of damage zone under a variety of coupled