导流洞围岩的流变分析与险情预报.pdfVIP

中国农村水利水电·2008年第6期 1O3 文章编号：1007—2284(2008)06—0103—03 导流洞围岩的流变分析与险情预掇 杨令强 ，张社荣 ，杨克坤。 (1．济南大学土木建筑学院，济南250022；2．天津大学建筑工程学院，天津 300072； 3．山东省水利设计院，济南250013) 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。 关键词：导流洞；围岩稳定；H-K模型；预报 中图分类号：TU457 文献标识码：A Rheological Analyses and Danger Forecasts of Diversion Tunnels YANG Ling—qiang ，ZHANG She—rong2，YANG Ke-kun。 (1．School of Civil Engineering and Architecture，Jinan University，Jinan 250022，China； 2．Collage of Civil Engineering，Tianiin University，Tianiin 300072，China； 3．Shandong Water Conservancy Design Institute，Jinan 250013，China) Abstract：Based on the basic law of tunnel rock deformation and distant affection law of tunnel excavation，the methodof judging tun— nel rock stability according to the state of tunnel rock deformation velocity is put forward．If the deformation velocity becomes smal— ler and smaller with the time，the deformation becomeg 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 ve— locity becomes larger and larger with the time，the deform ation state was sort into norm state and abnormal state．The abnormal state is very dangerous．Forecast must be put out in advance．H—K rheology model is used to simulate tunnel rocks．The element fi— nite method is used to simulate the processors for excavating the tunne1．A case study shows that the method is right．The stab