Based on the finite element limit analysis method, stability of face in case active failure under three constitutive models, Mohr-Coulomb model (MC), modified Cambridge (MCC) and Drucker-Prager (DP), were analyzed. The ultimate support pressure influence factors such as different burial depth ratios ( C/D ), cohesion c ) friction angle φ MC are also discussed. results show that safety factor ob...

Nowadays deep excavations are needed for construction of foundation of high rise buildings, providing space for parking and etc. In some cases deep excavations may be constructed in the vicinity of the subway tunnels and causes unpredicted extra displacements and internal forces in tunnel lining of tunnels which were not designed for them and consequently affect serviceability of tunnel. Theref...

The excavation of deep tunnels has significant spatial and temporal effects on the stress distribution surrounding rock. Accurately describing characteristics rock state is a key issue in analyzing failure mechanism Based numerical analysis, study influencing factors during was conducted. results show that (i) divided into mutation, disturbed, stables zones using quantitative index: peak stable...

Purpose. To understand the effect of fissured material on tunnels. These infrastructure tunnels must be safe in all respects, including construction, materials, and more. One challenges which engineers face is need to consider types as well material. As a result, order ensure safety tunnel, it important for us anticipate possible precipitation, displacements, stresses strains caused by construc...