Abstract: To select appropriate nonexplosive construction technologies for small crosssection tunnel in complex hard rocks, the nonexplosive construction technology of peripheral coring and central splitting is adopted and its influence on surrounding environment and construction effect are analyzed. The analytical and test results show the following: (1) The recommended nonexplosive construction technology is applicable to tunneling in relatively favorable hard rock or mediumhard rock (Grades Ⅱ and Ⅲ surrounding rocks). (2) The smallscale construction machinery and tools have disadvantages such as high working intensity, low tunneling efficiency, and poor safety, resulting in low advancing speed of 1 m/d. As a result, largescale drillingsplitting integrated machinery and its construction technology should be developed.

Key words: nonexplosive excavation, water , releasing tunnel；small crosssection, operation railway tunnel, hard rock; core drilling + splitting, drillingsplitting integrated machinery