【摘要】 文章应用GIS系统和数值模拟技术,以武汉长江隧道为例,对水下隧道突水危险性进行了分析评价。首先对隧道纵剖面和横剖面进行单元划分,然后将数值模拟成果转换到GIS中,以形成突水危险性评价数据库;在数据库支持下,对每个评价单元应用摩尔-库仑准则判断剪切破坏,应用最大拉应变准则判断拉伸破坏,将达到破坏标准的单元定义为突水单元;再对隧道同一横剖面的突水单元分布进行分析,搜寻潜在的突水通道;最后根据搜寻结果及突水单元的比例,结合江底段地表允许沉降控制标准进行突水危险性的划分。分析计算结果表明,武汉市过江隧道江底段纵剖面中,突水危险单元占本段72%,突水安全到危险过渡单元占19%,突水安全单元占9%;存在潜在突水通道的单元占江底段的12%,在施工过程中需要高度重视。更多还原

【Abstract】 Using the Yangtze RiverTunnel as an example, the risk assessment of a water burst in an underwater tunnel was carried out using a geographic information system(GIS) and numerical simulation. Firstly, the assessment units were divided on the horizontal and longitudinal sections of tunnel. Secondly, the data obtained by numerical simulations were converted in the GIS to form a relative database which can judge the shear failure and tensile failure in each assessment unit by the Mole-Coulomb criteria and maximum tensile strain criteria, respectively. Thirdly,each unit of water burst in the horizontal section was analyzed to search for potential passage for a water burst. Finally, the water-burst risk level was classified based on the above results and the percentages of water burst units as well as the allowable settlement standard. As for the water burst risk, the analyzed and calculated results show that it is 72% for the risky units, 19% for the moderate units, 9% for the safe units in the longitudinal profile, and 12% for the units with potential water burst passages, to which a high level of attention should be paid.更多还原