GB/T 51336-2018 in English
VALIDStandard for seismic design of underground structures
- Issued on:2018-11-01
- Implemented on:2019-04-01
- File Format:PDF
- Delivery:Via email within 10 business days
$1,669.00
Introduction
Interpretation of the core content of the standard
| Technical elements | Class A structure | Class B structure | Class C structure |
|---|---|---|---|
| Adjustment of design intensity | +1 degree | No adjustment | No adjustment |
| Requirements for liquefaction identification | Four-step method + time-history analysis | Four-step method | Simplified identification |
| Seismic resistance level | Level 1/Level 2 | Level 2/Level 3 | Level 3/Level 4 |
Key seismic calculation methods
Reaction displacement method is applicable to simple sections of homogeneous strata. The foundation spring stiffness calculation formula is: K=KLd (K is the base coefficient, L is the spring spacing, and d is the calculation length).
Shield tunnel application case
A subway tunnel in Beijing uses the integral reaction displacement method. By adjusting the ring width of the pipe segment (from 1.2m to 1.0m), the diameter deformation rate is reduced from 5.2% to 3.8%, meeting the standard requirement of ≤4%.
Seismic structural reinforcement measures
- Frame column axial compression ratio limit: single row column structure ≤0.65 (level 1)
- Deformation joint setting: avoid equipment area, width ≥30mm
- Liquid soil layer treatment: grouting reinforcement depth should reach the lower limit of the liquefied layer
Implementation suggestions
- The shear wave velocity and liquefaction index need to be clarified during the site evaluation phase
- Complex structures should be verified by three-dimensional time-history analysis
- Structures with level 1 seismic resistance should undergo full-scale model tests
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