为了降低岩溶地质隧道钻爆法施工超欠挖耗费，提高隧道一次性开挖合格率，对目前隧道超欠挖现状进行研究，分析影响隧道超欠挖的因素，介绍超欠挖对工程造价的影响情况。根据实际调查和现场试验，找出了影响超欠挖和造价耗费的主要因素，并制定了有效的控制措施。采用改进后的方案进行隧道开挖施工后，隧道一次性开挖平均合格率由674%上升到了839%，经济效益提高了499%，证明采取的处理措施是成功的，可为以后类似工程提供借鉴。

The stateofart of overbreak/shortbreak in tunneling is presented, the causes for overbreak/shortbreak are analyzed, and the influences of overbreak/shortbreak on the tunneling cost are described, so as to reduce the cost induced by overbreak/shortbreak of rock tunnels constructed by drilling and blasting method and to improve the qualification rate of tunnel excavation. Effective overbreak/shortbreak control technologies are determined on basis of investigations and trials. After these technologies are applied, the average qualification rate in tunnel excavation has been raised from 67.4% to 83.9%, and the economic efficiency has been improved by 49.9%, which demonstrates that the technologies applied are effective. The paper can provide reference for similar projects in the future.