The programme of "front benching pilot tunnel divisional and laminated skewed slot construction" was created.
独创了“正台阶导硐分部分层斜沟施工方案”,该方案具有良好的推广应用价值。
Pilot tunnel
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Tunnel
A tunnel is an underground or underwater passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.
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