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Advances in Civil Engineering
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2020
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Article
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Tab 1
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Research Article
Study on the Mechanical Behavior of Double Primary Support of Soft Rock Tunnel under High Ground Stresses and Large Deformation
Table 1
Compressibility classification of the soft surrounding rock.
Classification
Strain
(%)
Deformation description
I
0.4
1
Low
II
0.4∼0.2
1∼2.5
Medium
III
0.2∼0.15
2.5∼5
Severe
IV
0.15∼0.1
5∼10
Very severe
V
0.1
10∼15
Extremely severe