摘要
根据导流洞工程监测的基本规律和隧洞施工的空间影响效应规律,提出利用围岩点的位移速度状态判断围岩的稳定,减速说明围岩向稳定方向发展;匀速说明围岩处于临界状态或流变状态;零速说明围岩达到稳定状态;将加速分为正常加速和异常加速,异常加速是最危险的状态,应提前进行预报。为此利用H-K三元件流变模型模拟围岩,借助有限元法对导流洞的施工过程进行了数值模拟,对围岩的稳定状态进行了预报,并比选了支护的时间,得到一些有意义的结论。
Based on the basic law of tunnel rock deformation and distant affection law of tunnel excavation, the methodof judging tunnel rock stability according to the state of tunnel rock deformation velocity is put forward. If the deformation velocity becomes smaller and smaller with the time, the deformation become＇s stable. If the deformation velocity does not change with the time, the tunnel rock locate on critical state or rheology state. If the deformation velocity equals to zero, the rock is stability. If the deformation velocity becomes larger and larger with the time, the deformation state was sort into norm state and abnormal state. The abnormal state is very dangerous. Forecast must be put out in advance. nite method is used to simulate the processors for excavating state and reinforced time are ascertained. H-K rheology model is used to simulate tunnel rocks. The element fithe tunnel. A case study shows that the method is right. The stable
出处
《中国农村水利水电》
北大核心
2008年第6期103-105,108,共4页
China Rural Water and Hydropower
基金
国家自然科学基金(59778002)
关键词
导流洞
围岩稳定
H-K模型
预报
diversion tunnel
rock stability
H-K model
forecast
