The blasting construction of small clear distance tunnel inevitably causes accumulative damage of surrounding rocks and its mechanical behaviors will be degenerated.
小净距隧道的爆破施工不可避免地造成围岩累计损伤，岩体力学性能劣化。
There are a great many of tunnels in high-grade highway, it is necessary to adopt the small clear distance tunnel.
小净距隧道的主要特点是比分离式隧道占地少，比连拱式隧道造价低，造型美观；但施工难度大，技术含量高。
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