小净 meaning in Chinese

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Experimental study on mechanical characteristics of twin tunnels with small spacing
小净距并行隧道力学状态的试验研究
This paper summarizes the actuality and success in construction of such tunnel and has an analysis on problems to be solved
由此，本文总结了小净距隧道建设的研究现状及取得的研究成果，对有待解决的问题进行了分析。
Combined with the engineering practice of small interval tunnel in china , this paper points out its five key technology problems : its concept , reasonable clear interval , support parameter , construction method and strengthening technology for the shamed surrounding rock
摘要结合国内小净距隧道建设现状，笔者认为其设计施工关键技术主要在于小净距随道的合理净距、支护参数、施工方法、中夹岩加固技术等。