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《Underground Space》 2004-03
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Investigation on Reasonable Clear Interval of Small-interval Tunnel for the Freeway

LIU Wei  
Combined with the engineering practice of small interval tunnel of Jin Fu Freeway at the section from Sanming to Fuzhou and taking class II surrounding rock at the same depth (H=30.0m) with same supports and different intervals (L=3.0m~8.0m) as example, the yield approach degree of surrounding rock support system, the tunnel circumferential displacement at typical position and inter space rock displacement has been studied through numerical simulation. Results of numerical analysis show, that for two parallel tunnel inter space rock, the optimal and reasonable clear interval should be 8.0m, when adopting check pilot method excavation. If the enforced support at left and right footsies of inter space rock bottom, the clear interval L=6.0 m is reasonable as well. And it should be 8.0m, when adopting blench and check pilot combined method excavation. If there are enforced supports at up and down, the clear interval L=7.0m and 6.0m are reasonable.
【CateGory Index】: U451
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