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Advances in Civil Engineering
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2021
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Article
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Tab 1
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Research Article
Influencing Factors’ Analysis of Disturbance Degree of Key Stratum Based on the Response Surface Method
Table 1
Value of lithological strength coefficient.
Lithology
Tensile strength
R
ti
(MPa)
Bulking factor
K
Pi
Lithological strength coefficient
α
Soft
1
1.2
1.2
Medium
3
1.3
3.9
Hard
5
1.4
7.0