爆破是隧道开挖的领头工序，开挖进度和成本是一对互动的因素。通过工程实例，就钻爆法隧道在限定单段装药量的情况下，对爆破掘进可取得的进尺进行验证；同时，在限定掘进进尺条件下，就隧道爆破合理的钻孔数量和装药量进行探讨。旨在提请业界重视对进尺和单耗的研究。

Blast is the leading sequence of tunnel excavation and progress and cost are a pair of interactive factors of tunneling. In this article, the achievable pullout length under restricted charge weight per delay is verified and the reasonable drill hole numbers and explosives to be charged for a certain pullout Length are also discussed. This article is aimed at drawing the attention of the technical persons in the field of tunneling to the importance of study on pullout length and powder factor.