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随着隧道及地下工程的发展,辅助坑道的作用也在不断增进。近年来,设置专用的辅助坑道来作地质预报和获得实际的地质参数与信息,即是辅助坑道用途上的一个发展,特别是在那些特殊重要的隧道及地下工程中,更认为设辅助坑道是十分必要的工程措施和安全手段。日本青函海底隧道,为地质勘探和施工排水设置了专用的超前导坑,不仅贯通于海底部分,而且比主隧道提前几年从两端开工,即为明显的一例。连接日本北海道和本州两大岛的青函海底铁路双线隧道,由成立于1964年的日本铁路建设公团承担建设任务。隧道全长53.85km,其中23.3km处于津轻海峡之下,隧道上方最大
With the development of tunnels and underground works, the role of auxiliary tunnels is also on the rise. In recent years, setting up dedicated auxiliary tunnels for geological forecasting and obtaining actual geological parameters and information is a development in the use of auxiliary tunnels. In particular, in those tunnels and underground works of special importance, it is even considered that the auxiliary tunnels are Very necessary engineering measures and safety measures. Japan’s Green Sea Cross Harbor Tunnel has set up a dedicated lead pilot for geological prospecting and drainage. It is not only penetrated into the seabed, but also an obvious example, starting from both ends several years earlier than the main tunnel. Japan’s railway construction corps, which was established in 1964, undertook the construction tasks of the Seikan sea railway double-track tunnel connecting Japan’s Hokkaido and Honshu. The total length of the tunnel is 53.85km, of which 23.3km is under the Tsugaru Strait and the largest above the tunnel