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大宝山隧道是京珠国道主干线粤境高速公路上的长大隧道，为双洞6车道，按单线计总延长3150m，该隧道是京珠国道主干线粤境高速公路全境最早开工的施工标段，也是目前我国已建成的长度最长的大跨度隧道，隧道内营运管理设施极其完善，因而对隧道的施工、防排水要求较高，从而增加了设计的难度和复杂性。对该隧道的设计概况，设计中采用的新技术、新方法作了详细的介绍，对以后的设计可提供有益的探索。
Dabaoshan Tunnel is the main tunnel on the Beijing-Zhuhai National Highway Cantonese Expressway tunnels, double-lane 6 lanes, according to a single line total extension of 3150m, the tunnel is the main road of Beijing-Zhuhai State Expressway throughout the territory of the construction started The tenders are also the longest span long-span tunnels that have been built in our country at present. The operation and management facilities in the tunnel are extremely perfect. Therefore, the requirements for tunnel construction and drainage are high, which increases the difficulty and complexity of the design. The tunnel design overview, the design of new technologies, new methods were introduced in detail, the design can provide useful exploration.