摘要
针对岩体的应变软化特性,基于双线性损伤模型和应力等效原理,推导了卸荷围岩应力状态的损伤理论解析解,进而分析了隧道开挖后围岩应力随径向距离的分布特点,从而将卸荷后的围岩分为四个区域,即完全损伤区、非完全损伤区、弹性区和原岩应力区。根据围岩的实际破坏特点,采用两种不同的方法对完全损伤区的应力解进行了修正。通过对隧道围岩应力分布特点的分析,提出了基于损伤理论的隧道围岩松动圈的界定标准,认为完全损伤区即为隧道围岩松动破坏区。最后运用损伤理论解析解对张石高速公路隧道围岩松动圈进行了估算预测,同时将预测结果与现场监测值进行对比分析,验证了理论解的适用性。
Considering the strain softening characteristic of rock mass,stress analytical solutions of unloading rock are derived based on bilinear damage model and stress equivalence principle,and the stress distribution character of the surrounding rock after excavation is analyzed,thus the unloading rock is divided into four zones,namely complete damage zone,incomplete damage zone,elastic zone and original stress zone.According to the failure characteristics of surrounding rock in reality,two completely different methods are used to amend the analytical solutions of complete damage zone.Through the analysis of stress distribution in tunnel surrounding rock,the definition criterion of surrounding rock loose zone based on the damage theory is proposed,taking the complete damage zone as the loose zone.Finally,the prediction analysis of the surrounding rock loose zone in Zhang-shi highway tunnel project is carried out,as well as the comparison between the prediction results and the monitoring data,thus the applicability of the analytical solutions is verified.
出处
《地下空间与工程学报》
CSCD
北大核心
2011年第6期1060-1064,1090,共6页
Chinese Journal of Underground Space and Engineering
基金
长江学者和创新团队发展计划资助(IRT1029)
关键词
松动圈
损伤模型
估算预测
应力分布
loose zone
damage model
estimation and prediction
stress distribution
