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Experimental Study of Tunnels in Squeezing Ground Conditions
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2020-10-01
[PDF-5.09 MB]
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Edition:Final Report
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Abstract:Squeezing rock conditions have been causing significant risks in the construction of tunnels in rock formations, especially at great depth and in weak and/or weathered rock masses. The tunnel excavation may induce a stress change with considerable deviatoric stress that can cause squeezing ground behavior. The mechanism of squeezing failure of tunnels is not clearly understood yet, and the goal of this research project is to understand better the causes leading to squeezing ground phenomena. The objectives of this research were to identify the major causes of squeezing in soft rock, quantifying the squeezing amounts and develop experimentally verified squeezing criterion for broader application to tunnels. To achieve the research objectives, a series of novel true-triaxial compression experiments with simultaneous tunneling in rock were conducted.
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