基于现场实测数据统计的隧道围岩压力分布规律研究

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Abstract The action mode and space-time evolution laws of surrounding rock pressure are the core contents of tunnel supporting structure design，which are hot issues in underground engineering research. Based on the summary of main types and influencing factors of tunnel surrounding rock pressure and the statistical analysis of surrounding rock pressure of 91 monitoring sections in 44 tunnels，the population distribution characteristics of surrounding rock pressure and their relationships with surrounding rock grade and buried depth of tunnel are studied. Then the variation law of rock pressure and lateral pressure coefficient with the increase in buried depth is discussed. Based on the statistical analysis of field monitoring data of rock pressure，the basic law of rock pressure time-history is studied. Three stages including rapid growth-slowly growth-settle out is put forward；and the rapid growth stage is mostly the time during unsupported or without effect of support after tunnel excavation. Finally，the distribution laws of rock pressure along the tunnel and the feature of nonuniformity coefficient are discussed. The results offer some references for analyzing the pressure mechanism of tunnel surrounding rock and perfecting the design method of supporting structure.

Key words： tunnelling engineering surrounding rock pressure field monitoring time-history curves space distribution

Received: 30 August 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I7/1392

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