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| Research on the Calculation M ethod for Vertical Earth Pressure of Shield Tunnel in Soil Layer |
| SUN W en-hao |
| China Railway Siyuan Survey& Design Group Co., Ltd., Wuhan, Hubei 430063, China |
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Abstract Research purposes: There are some differences between the common -used calculation method for vertical earth pressure for design of shield tunnel and themethod stipulated in the code for design of tunne.l In this paper, the discussion is made on the calculation method for the vertical earth pressure of shield tunnel in soil layer. Through the quantitative and qualitative comparing the common calculation method of vertical earth pressure for design of shield tunnel with the method stipulated in the code for design of tunnel, the analysis of the coincidence between measured value on -site and calculated result ismade. The feasible calculation method forverticalearth pressure of shield tunnel in soil layer is offered.
Research conclusions:The calculation method for vertical earth pressure stipulated in the current code for design of tunnel is inapplicable for the shield tunnel in soil layer. Forsoftclay stratum, the load model of allearth -pillars can be used to calculate the verticalearth pressure fordesign. Forotherstratums, no matter what the soil depth is, the Terzaghi Arch Theory can be used to calculate the verticalearth pressure, but for sand stratum, the groundwaterpressure and soil pressure should be calculated separately.
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Received: 15 June 2009
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2009, Vol. 26 
