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岩石或坚硬地基中的石洞 - 工程示例 Tunnels in hard rock are relatively easy to construct, requiring little or no extra support during construction. The main area of concern is from discontinuities or softer areas in the rock, which can put pressure on the tunnel walls. The diagram shows a simplified cross-section of a typical tunnel bored through rock or hard ground. The icons show where the instruments would normally be installed - hover over the icon that is lettered on the diagram (EX, TL, etc) to see a brief description.
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SP
- 测量标点
PZ
- 渗压计
EX
- 位移计
ST
- 应变计
TL
- 隧洞衬砌压力盒