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考虑各种重要因素（例如施工支洞长度的经济性、地质控制性条件、地形特点、足够的岩层覆盖厚度、工期）选择最合适的隧洞布置方案是一个很困难的优化问题。本文作者在１９８１年发表的文章中，对选择长水工隧洞的施工支洞的数目和长度问题给予了高度重视。自那以来，这一领域又有了新进展。新的钻进技术似乎显著地降低了隧洞工程的总造价，从而也改变了隧洞的最优布置和结构。本文通过对近期进展的回顾，探讨了新的钻进方法对优化隧洞和施工支洞的布置的影响。
Choosing the most suitable tunnel layout is a difficult optimization problem considering various important factors such as the length of the branch, the geologically controlled conditions, topographical features, enough thickness of the rock cover, and the duration of the project. In an article published in 1981, the author attached great importance to the selection of the number and length of construction branch holes in the Longwall Tunnel. Since then, there has been new progress in this area. The new drilling technology seems to significantly reduce the total cost of the tunnel project, thus changing the optimal layout and structure of the tunnel. The paper reviews the recent progress and discusses the impact of the new drilling method on the layout of the optimized tunnel and construction branch holes.