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《Chinese Journal of Underground Space and Engineering》 2012-01
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Theoretical Solution for the Dividing Depth of Deep Tunnel and Shallow Tunnel in Earth

Cheng Xiaohu(Beijing Urban Engineering Design & Research Institute Co.,Ltd,Beijing 100037,China)  
In order to determine the dividing depth of shallow earth tunnel and deep earth tunnel quantitatively,the unloading arch is studied in theory.Based on the assumption that the horizontal pressure limit of midspan is Rankine's passive earth pressure for unloading arch in critical depth,the quantitative criterion of the dividing depth and solution equations was established in clayey and sandy soil tunnel.Theoretical analysis shows that the ratio(n) of the dividing depth to pressure arch height is related to the cohesion,internal friction angle,and the width of tunnel in clayey soil while the ratio n is only related to the internal friction angle for sandy soil tunnel.The theoretical range of n value is 1.0 ~ 3.0 and the empirical value is just within the range.A comparison with "Code for design on civil air defense works" shows that the dividing depth under static load is greater than that under dynamic load.Finally,the presented theory is applied to large cross-section loess tunnels of high-speed railway from Zhengzhou to Xi'an and the result is well agreed with practice.
【CateGory Index】: U451
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