隧道围岩挤压变形预测方法研究

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Abstract Research purposes: To predicate the squeezing deformation of the surrounding rock of tunnel is an important work for the survey and design of the weak surrounding rock tunnel in high stress area． There are limitations when using commonly － used prediction ways such as critical burying method and critical stress ratio method． So it is urgent to need a new and available method for prediction of the squeezing deformation of the surrounding rock of tunnel．

Research conclusions: The squeezing deformation of surrounding rock can be predicted by strength stress ratio value F， and it is proposed to use the Hock － Brown strength criterion and GSI method to estimate the rock mass strength and use the maximum crustal stress trending to the tunnel as the crustal stress in the strength stress ratio value F． Usually，the destroy of the squeezing deformation happens when the F is less than or equal to 1 and the severe squeezing deformation happens when the F is less than or equal to 0． 5． Therefore，the 0． 5 and 1 can be separately used as the critical values for the squeezing deformation with different degrees． The practice shows the value F method is reliable for prediction of the squeezing deformation of the surrounding rock．

Key words： weak surrounding rock high stress squeezing deformation prediction

Received: 18 October 2011

PACS:

U451+． 2

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I2/50

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