Analytical dataset to determine squeezing potential of deep tunnels

This article presents a dataset that consists of historical strain data from deep tunnel construction and an analytical study that uses the ground reaction curve (GRC) to calculate the support pressure required to lower the risk of squeezing potential. In deep tunnel excavation, high in-situ stress conditions can cause an instability phenomenon known as squeezing. Historical tunnel strain data are classified into categories based on the percentage of tunnel convergence observed. Furthermore, 480 ground reaction curves (GRC) were developed and analyzed: 5280 calculations were performed with tunnel radii of 3, 4, and 5 m, depths ranging from 100 to 1000 m (in increments of 100 m), uniaxial compressive strength <i>(σ_ci</i> ) values of 30 and 50 MPa, and Geological Strength Index (<i>GSI</i>) values from 20 to 90 (in increments of 10). Three primary factors were used to estimate support capacity: the reduction of internal pressure relative to in-situ stress (<i>p_i/p_o</i> ), strain (<i>%ε</i>), and the stability factor (<i>σ_cm/p_o</i> ). Strain (<i>%ε</i>) and the stability factor (<i>σ_cm/p_o</i> ) were classified based on the resulting <i>p_i/p_o</i> (0-0.9). A graph was obtained to determine the minimum <i>p_i/p_o</i> that reflects all rock mass class conditions in deep tunnel construction in an effort to avoid squeezing at specific limits.