基于改进Weertman模型的炭质岩隧道围岩蠕变特性研究

炭质岩隧道围岩变形具有量值大、变形快且持续时间长、受开挖扰动大及蠕变变形等特点,是炭质岩隧道施工所面临的关键技术难题。基于此,文章以广西河百高速公路炭质岩隧道围岩位移、温度变化情况作为统计依据,将温度与时间建立函数关系,引入Weertman蠕变模型,从机理上研究温度随时间变化下围岩的蠕变特性,揭示炭质岩隧道围岩蠕变机制及发展规律。结果表明:在不考虑渗压条件下,改进Weertman模型能有效计算分析及预测温度随时间变化下炭质岩隧道围岩的蠕变发展规律,对炭质岩隧道设计、施工和运维具有指导意义。

Study on Creep Characteristics of the Carbonaceous Surrounding Rocks Based on Improved Weertman Model

Deformation of surrounding rocks of the carbonaceous rock tunnel is characterized by large magnitude,rapidity,long duration,large disturbance and creep,which is a key technical problem encountered during construc?tion of the carbonaceous rock tunnels.Based on the statistical basis of displacement and temperature variation of the carbonaceous surrounding rocks of Guangxi Hechi-Baise expressway tunnels,a function relationship between temperature and time is established and the Weertman creep model is introduced,the creep characteristics of sur?rounding rocks is studied from the perspective of mechanism under the correlationof temperature and time,and the mechanism and development law of creep of the carbonaceous surrounding rocks are revealed.The results show that by using the improved Weertman model it can effectively calculate,analyze and predict the creep development law of carbonaceous surrounding rocks under the correlation of temperature and time without considering the osmot?ic pressure.