Table 1 Calculation results of surrounding rock pressure of shallow buried tunnel by different methods.

From: Nonlinear energy consumption analysis of shallow-buried bias tunnel stability with improvement of failure mode

Horizontal surface ( δ = 0° )

Slope surface dip angle ( δ = 18° )

References39

References38

References40

Limit analysis upper bound method in this paper

Limit equilibrium method

Limit analysis upper bound method

Limit analysis upper bound method

Normative recommenda- tion method

Mode A

Mode B

 

m = 1.0

m = 1.1

m = 1.2

m = 1.4

K0

q0/kPa

K

q/kPa

q/kPa

q/kPa

φc/(°)

q/kPa

K

q/kPa

q/kPa

q/kPa

q/kPa

1.5

264.7

1.2

147.7

147.7

158.5

30

307.1

1.2

143.4

171.5

187.3

216.2

1.4

270.9

1.0

168.7

169.3

175.7

32

308.5

1.0

165.2

190.7

223.4

254.2

1.3

277.3

0.8

197.2

199.1

201.1

34

310.3

0.8

191.1

228.2

264.8

289.4

1.2

283.9

0.6

238.6

243.2

243.0

36

312.5

0.6

232.4

276.6

324.3

359.7

1.1

290.8

0.5

\

\

\

38

315.2

0.5

269.6

310.6

355.7

407.3

1.0

297.9

0.4

\

\

\

40

318.2

0.4

296.7

338.4

393.8

456.1

  1. (Note: K0 is the lateral pressure coefficient of the tunnel top rock and soil layer. Referring to the relevant research results of the Taisha base, the recommended value interval is: 1.0 ~ 1.5)
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