The concept of virtual reality is a very powerful tool for enhancing the human perception of complex threedimensional information. The field of geomechanics is predestined for such an application since we are not only dealing with complex 3-D information about excavation geometries and geological features but also may be interested in displaying results of numerical simulations which may by the...

Appropriate constitutive models and reliable excavation support sequences are believed to be the major concern in using finite element (FE) analysis simulate shield tunnel excavation. This paper presents systematic two-dimensional (2D) three-dimensional (3D) FE analyses employing a number of accounting for initial soil anisotropy non-coaxial plasticity, as evidenced within site investigations f...

Tunneling can compromise the safety and serviceability of existing buried infrastructure because settlements, crack openings, dislocations, material strains. A continuum-based soil-structure interaction model, implementing an equivalent Timoshenko beam, is used to evaluate excavation-induced settlements longitudinal deformations tunnels pipelines. Both single twin tunneling scenarios are examin...

A Dynamic Bayesian Network (DBN) model for probabilistic assessment of tunnel construction performance is introduced. It facilitates the quantification of uncertainties in the construction process and of the risk from extraordinary events that cause severe delays and damages. Stochastic dependencies resulting from the influence of human factors and other external factors are addressed in the mo...

Tunnels and foundation pits are two separate types of excavation that frequently used in urban settings. Excavating tunnels sequentially around existing pile foundations is becoming more prevalent as underground space utilization rates increase. The deformation load transfer mechanisms the group under asymmetric conditions “first tunnel, then pit” pit, tunnel” studied from perspective relative ...

Tunnelling through cities underlain by soft soil, commonly associated with soil movement around the tunnels and subsequent surface settlement. The predication of ground movement during the tunnelling and optimum support pressure could be based on analytical, empirical or the numerical methods. The commonly used Earth pressure balance (EPB) tunneling machines, uses the excavated soil in a pressu...

tunnelling through cities underlain by soft soil, commonly associated with soil movement around the tunnels and subsequent surface settlement. the predication of ground movement during the tunnelling and optimum support pressure could be based on analytical, empirical or the numerical methods. the commonly used earth pressure balance (epb) tunneling machines, uses the excavated soil in a pressu...

ground settlement due to the shallow tunneling in urban areas can have considerable implications for aboveground civilinfrastructures. engineering geological characteristics of the tunnel host ground including geotechnical parameters of surrounding soil,groundwater situation, and in situ stress condition are amongst the most important factors affecting settlement. in this research, groundsettle...

Due to urbanization and population increase, need for metro tunnels, has been considerably increased in urban areas. Estimating the surface settlement caused by tunnel excavation is an important task especially where the tunnels are excavated in urban areas or beneath important structures. Many models have been established for this purpose by extracting the relationship between the settlement a...

Abstract. This paper presents a method for rapid and automatic visualisation of over-undercutting based on 3D reconstruction rendering tunnel point clouds. The uses model filtering our improved voxel cloud lite to maximise the preservation original features while streamlining cloud. is then completed according proposed alpha-shape algorithm with low parameters combined fast optimisation model, ...