摘要
隧道穿越岩溶区施工中,既有隐伏溶洞因其具有的隐蔽洞使得在工程上不能事先采取安全措施,易遭受猝不及防的破坏,给隧道施工和运行造成了很大的安全隐患,危害性较大。针对隧道穿越岩溶区大部分常见中、小尺度既有隐伏溶洞引起的岩溶隧道稳定性问题,采用数值试验方法,系统分析了隧道顶部不同尺度和距隧道不同距离的既有隐伏溶洞对圆形隧道围岩应力、位移和支护结构内力的影响,分析了隧道顶部既有隐伏溶洞引起的隧道围岩塑性区的变化特征。在数值试验基础上,对顶部隐伏溶洞引起的隧道位移变化规律内在机制进行分析。研究表明,一定范围内的大尺度既有顶部隐伏溶洞将引起隧道位移的增加和隧道围岩拉应力的增加。研究结果可为岩溶区隧道建设提供必要的技术支持,对岩溶区隧道设计与施工的科学化、定量化具有直接的推动意义。
In the construction of tunnel through karst area due to the concealed caves which in the project could not be taken to safety and often made nonplused susceptible damage to the tunnel construction and that caused a great deal of potential safety problems and greater danger. Because the stability problem caused by mid and small-scale concealed karst cave when tunnel through karst areas is most common,The influence of different scale of crown concealed kast cave and the different distance between the tunnel and the crown concealed kast cave to rock stress,displacement and the internal forces of supporting structure were studied used numerical analytial test method,and the influence of the concealed cave on the tunnel plastic changes of the rock characteristics is also studied. Based on the numerical tests,the tunnel displacement changes inherent mechanism caused by top concealed are proposed. The study shows that within a certain scope of the existing large-scale top concealed cave will lead to increased displacement of the tunnel and the tunnel of rock stress will also increase. The research results of the karst area tunnel have a scientific and quantitative promotion to the design and construction of karst tunnel.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期485-489,共5页
Rock and Soil Mechanics
关键词
隧道工程
既有隐伏溶洞
稳定性
数值试验
tunnel engineering
concealed karst caverns
stability of tunnels
numerical experiment
