城市水下隧道最小埋深的设计方法研究

Research on Design Methods for Minimum Burial Depth of Submerged Tunnels in Cities

基于城市水下隧道环境条件的特殊性,以长沙市营盘路湘江隧道为依托,提出水下隧道最小埋深的设计标准流程:首先,在对日本经验法、挪威经验法和顶水采煤法等工程经验法分析的基础上,提出隧道最小埋深的初始值;然后,通过线路纵断面的拟定,并结合典型隧道工程类比,不断调整该初始值;最后,结合数值分析法的验算结果,确定隧道最小埋深的合理设计值,最终形成城市水下隧道最小埋深的设计方法。

Based on particularity of environmental conditions of submerged tunnels in cities, this paper proposes a standard design procedure for the minimum burial depth of submerged tunnels on the basis of Xiangjiang Tunnel at Yingpan Road of Changsha： first, propose initial value of the minimum burial depth of tunnels based on analysis of the Japanese empirical approach, Norwegian empirical approach and coal extraction on topside of water, etc. ; second, adjust initial value continuously by drawing up longitudinal section of line and comparing with typical tunnel projects; and finally, determine reasonable design value of the minimum burial depth in combination with checking results of numerical analysis method. Eventually a design method for the minimum burial depth of submerged tunnels in cities is established.