Prestressed Rock Bolt Support Considering the Influence of Blocky Rock Mass Quality

Mechanical response of large-span variable-cross-section tunnels: insights from numerical simulation and field monitoring

Surrounding rock deformation and loosening zone thickness are critical parameters for tunnel support design and stability evaluation. This study examined the variable-cross-section Qingshan Tunnel on the Ren-Zun Expressway. Systematic field monitoring measured surrounding rock pressure, displacement, and loosening zone...

Study on the Influence Law of Tunnel Primary-Support Arch Frame on Rock-Bolt Support Function

This study reviews the development of research on systematic-rock-bolt effectiveness in soil tunnels and clarifies the mechanism of rock-bolt inefficiency. Field statistics show that rock-bolt axial forces in soil tunnels are generally low or even compressive, especially at the arch crown, indicating limited contributi...

Optimization of rock bolt support parameters for TBM tunnels in high in situ stress soft rock based on deformation and stress evolution analysis

Large deformation of surrounding rock is a critical challenge during TBM tunnelling in deeply buried high in situ stress soft rock, where delayed deformation and insufficient support stiffness may lead to support failure and machine jamming. However, the quantitative influence of rock bolt support parameters on def...

Bolt Support Mechanisms and Optimization for Splitting Failure in Deep Caverns

Field validation and engineering application of pressure-dispersed prestressed CFRP anchor cables for stabilizing toppling unstable rock slopes

This study evaluates the geomechanically efficacy and stability control of toppling-prone hazardous rock slopes subjected to multi-field coupled configurations, utilizing prestressed carbon fiber reinforced polymer (CFRP) anchor cables. A three-dimensional finite-element geomechanically model capturing sandstone hetero...

Analytical modeling of mechanical response and ultimate failure of a grouted rockbolt with a single corrosion pit

A single corrosion pit in a grouted rockbolt should be mechanically interpreted as a localized weakened segment, because it introduces a discontinuity in axial stiffness, disturbs the dominant load-transfer zone near the loaded end, and complicates the ultimate failure behavior of the anchorage system. To clarify this...