隧道围岩等级划分标准-法律综合法律援助-法律咨询免费平台-国际律师联盟

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问题	隧道围岩等级划分标准
释义	隧道围岩分成六类，分别是Ⅵ、Ⅴ、Ⅳ、Ⅲ、Ⅱ、Ⅰ，数字越大的围岩性质越好。新规范将隧道围岩分成六级，分别是Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ，数字越小的围岩性质越好。所以老规范中的海类围岩就是新规范中的Ⅱ级围岩，老规范中的Ⅱ类围岩就是新规范中的Ⅴ级围岩了。隧道围岩一般共分为6级,一级围岩最好,基本上是整块坚硬的石头；六级围岩最差,基本上是碎散的松软土体。
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