7.1.1 Cyclic footage shall be determined based on tunnelsurrounding rock classification, section dimensions and performanceof drilling or mucking equipment.7.1.2 Controlled blasting shall be required for each tunnel orcavern excavation. The number of dril (共 1458 字) [阅读本文] >>


说明: 本文档由创作者上传发布,版权归属创作者。若内容存在侵权,请点击