Relying on the successful example of Xia-Shen railway Meilin tunnel under crossing Shenzhen Meiguan highway, this paper introduced detailedly the taken new method, new technology to solve shallow buried large-span tunnel under crossing operating highway construction problems. Elaborated emphatically the microseismic blasting construction technology, under heading bottom advance whole section capping method mechanic numerical analysis and construction technology, summarized the construction advantages and applicable conditions of under heading bottom advance whole section capping method, provided good experience for the next step similar projects construction.%依托厦深铁路梅林隧道下穿深圳梅观高速公路取得的成功实例，详细介绍了解决浅埋大跨隧道下穿现运营高速公路施工难题所采用的新方法、新技术。重点阐述了微震爆破施工技术、下导洞超前全断面压顶法力学数值分析及施工工艺，总结了下导洞超前全断面压项法的施工优点和适用条件，为下步同类工程施工提供良好的经验借鉴。
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