水下隧道裂隙围岩渗流控制因素敏感性层次分析

Analytic hierarchy process of factor sensitivity on seepage control of underwater tunnel fissured surrounding rock

在分析裂隙介质水力特性的基础上,采用层次分析法,结合工程实践经验,分析影响水下隧道裂隙围岩渗流控制的主要因素,并确定它们各自的权重。结果表明,每延米洞长洞室围岩断层等破碎带的平均宽度权重最大,是影响裂隙围岩渗流控制的最主要因素;其次为上覆含水体富水性和每延米洞长洞室围岩张开裂隙的平均数量。当洞室位置和洞室尺寸等参数设定后,每延米洞长洞室围岩断层等破碎带的平均宽度、上覆含水体富水性和每延米洞长洞室围岩张开裂隙的平均数量是影响水下隧道裂隙围岩渗流控制的最主要因素。研究结果可以为海底隧道及地下水封储油岩洞库等水下隧道的渗流控制及灾害防治提供科学的依据。

In order to evaluate each main factor influencing the seepage control of underwater tunnel fissured surrounding rock exactly, analytic hierarchy process is adopted, main factors influencing the seepage control of underwater-tunnel fissured surrounding rock are analyzed, and each weight is determined based on analyzing hydraulic characteristics of fissured medium combined with engineering experience. The results show that the mean width of fault fractured zones of surrounding rock and other ones per meter length of tunnel has the maximum weight, it is the uppermost ingredient influencing the seepage control of underwater tunnel fissured surrounding rock; it＇s also influenced by water yield property of overlaying aquifer and the average number of surrounding rock gapping fissures per meter length of tunnel. In addition, after setting cavern location and its dimension and other parameters, the mean width of surrounding rock fault fractured zones and other ones per meter length of tunnel, the water yield property of overlaying aquifer and the average number of surrounding rock gapping fissures per meter length of tunnel are the main factors influencing the seepage control of underwater tunnel fissured surrounding rock. Furthermore, the research results may afford the scientific bases for the seepage control and disaster prevention of subsea tunnels, underground hydraulic seal oil storage rock caverns and other underwater tunnels.