赣龙铁路梅花山隧道围岩应力及岩体模量研究  

STUDY ON STRESS FIELD AND MODULUS MEASUREMENT OF SURROUNDING ROCK MASSES IN MEIHUASHAN TUNNEL OF GANZHOU–LONGYAN RAILWAY

作　　者：罗超文[1] 李海波[1] 李卫兵 高周俊 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中铁十六局集团第五工程有限公司,河北唐山063030

出　　处：《岩石力学与工程学报》2014年第9期1880-1886,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国科学院战略性先导科技专项(B类)资助(XDB10030200)

摘　　要：基于赣龙铁路梅花山隧道围岩应力以及围岩岩体模量实测结果，对隧道围岩应力分布特征、围岩模量的分布特征、围岩应力集中区向深部转移特性以及开挖方式对围岩松弛区影响进行分析。研究结果表明：（1）梅花山隧道是以构造应力为主的高地应力区；（2）围岩的应力集中区向深部发生了转移，水平孔应力集中区范围为5.9～11.9 m，铅直孔应力集中区范围为7.9～15.9 m。围岩应力集中区向深部转移后，其应力集中度大为降低，水平孔最大主应力集中度为1.87倍，铅直孔最大主应力集中度为1.23倍。（3）采用光面爆破隧道壁松弛范围为0～5 m，底板没有采用光面爆破松弛范围为0.0～7.2 m。松弛区相同深度水平孔岩体模量值及应力值均比铅直孔岩体模量值及应力值大。应力峰值的转移，改变了围岩应力场分布规律，为隧道支护提供一种思路和方法，具有很好的工程应用价值。The distribution characteristics of stress and modulus,the features of stress concentration zone of surrounding rock,and the effect of the method of excavation on the loose zone of surrounding rock were analyzed based on the measurements in Meihuashan tunnel of Ganzhou-Longyan railway. The region of Meihuashan tunnel was found to be located in a high geostress zone with the initial principal stresses to be the tectonic ones. The stress concentration zone in surrounding rock shifted downwards. The stress concentration zone was 5.9-11.9 m for the horizontal hole,and 7.9-15.9 m for the vertical hole. The degree of stress concentration was greatly reduced after the stress concentration zone in surrounding rock was transferred further deeper. The concentration factor of the maximum principal stress was 1.87 for the horizontal hole,and 1.23 for the vertical hole. The relaxed range of the tunnel wall was 0-5 m with the smooth blasting,and the relaxed range was 0.0-7.2 m for the tunnel floor without the smooth blasting. The stress and the modulus of rock mass around the horizontal hole were larger than those for vertical hole at the same depth of the stress relaxation zone. The transfer of the peak stress changed the stress distribution of surrounding rock,which lent a clue for a new type of tunnel support.

关 键 词：岩石力学 水压致裂法 地应力测量 围岩应力 岩体模量 

分 类 号：TU45[建筑科学—岩土工程]