摘要
在高地温环境下,地下洞室气温及围岩温度的变化会导致围岩应力、混凝土喷层温度和应力的改变,为了研究围岩参数随温度变化时对混凝土喷层温度和应力的影响,结合新疆某电站引水隧洞工程,研究高地温对围岩力学参数的影响,分析围岩参数随温度变化时对混凝土喷层温度和应力的影响机制,分别对围岩和喷层的热力学参数随温度变化时对喷层的温度和应力的影响进行了分析。研究结果表明,当温度从20℃升高至100℃时,围岩弹模、比热、导热系数和线膨胀系数随温度变化时对喷层应力影响不超过5%;混凝土弹模、比热、导热系数和线膨胀系数参数随温度变化时对喷层受力影响不超过5%,温度升高对喷层应力的影响较小。该问题的研究,为高地温区围岩喷层结构的设计和施工中采取合理的温控措施提供了理论依据。
The change of rock internal microstructure along with temperature increasing leads to the variation of surrounding rock stress,strain and temperature of concrete shotcrete layer.The temperature and the thermal stress of the lining concrete will affect the strain and temperature of concrete shotcrete layer,and its influence mechanism was discussed.It is very important to control stability of supporting structure.Taking Xinjiang＇s diversion tunnel as a research object,through comparing the maximum temperature,maximum temperature difference between inner and surface,minimum temperature,maximum tensile stress in early period and winter,the effects of the change of temperature in tunnel and surrounding rock on the temperature and thermal stress of the lining concrete as well as occurrence,development and control of the temperature cracks are analyzed.The results show that both the temperature in tunnel and the temperature of surrounding rock have no significant influences on the temperature field and stress field of the lining concrete.The deformation modulus of rock mass,specific heat,thermal conductivity,coefficient of linear expansion of rock have smaller changes in temperature between 20 ℃ to 100 ℃ and the influence of temperature stress of shotcrete layer is small.The research results provide valuable references for the design and construction of tunnel engineering.
出处
《石河子大学学报（自然科学版）》
CAS
2017年第1期46-51,共6页
Journal of Shihezi University(Natural Science)
基金
国家自然科学基金项目(51408377)
石河子大学杰出青年科技人才培育计划(2015ZRKXJQ06)
关键词
引水隧洞
围岩参数
混凝土喷层
温度
喷层应力
diversion tunnel
mechanical parameter of surrounding rock
concrete shotcrete layer
temperature
stress of shotcrete layer
