高地应力作用下大理岩岩体的TBM掘进试验研究

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Abstract The study of rock breaking efficiency by rolling cutters mainly focuses on laboratory linear cutting experiment and numerical simulation analysis. Tunnel boring machine(TBM) penetration test is not popularly conducted in project sites. Three TBMs are used to respectively excavate the headrace tunnel #1，#3 and the construction drainage tunnel in Jinping II hydropower station. The TBM penetration tests，the sieve tests of the rock chips and big chip statistical analysis are carried out respectively in these three tunnels under different tunnel buried depths(namely different geostresses). The influences of engineering-geological conditions，TBM parameters and TBM operation parameters on TBM penetration rate and the variation in rock mass boreability index under high geostress are analyzed. The analysis results show that under high geostress，although the penetration rate of TBM increases with increasing thrust force，TBM does not operate in optimal state while the thrust force is larger than a specific value. TBM operation should match with the conditions of rock mass and geostress.

Key words： tunnelling engineering marble high geostress sieve tests penetration test tunnel boring machine (TBM)

Received: 14 April 2010

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/I12/2522

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