<p>A major research project investigating the effect of tunnelling on existing tunnels has been completed at Imperial College London. This subject is always of great concern during the planning and execution of underground tunnelling works in the urban environment. ...

<p>The simulation of the advancing process for arbitrary alignments during shield tunneling requires a continuous adaption of the nite element mesh in the vicinity<br />of the tunnel face in conjunction with a steering algorithm for the Tunnel Boring Machine ...

<p>The design of near-surface civil infrastructure requires detailed consideration of the geological/ geotechnical conditions, excavation geometry and sequence, and ground support measures to ensure stability of the underground openings and minimal impact ...

The paper demonstrates the application of a hypoplastic model in class A predictions of a NATM tunnel in an urban environment. The tunnel, excavated in a stiff clay, is 14 m wide with 6 m to 21 m of overburden thickness. The constitutive model was calibrated ...

<p>In the metro-line crossing minimization problem, we are given a plane graph G = (V,E) and a set L of simple paths (or lines) that cover G, that is, every edge e ϵ E belongs to at least one path in L. The problem is to draw all paths in L along the edges ...

The paper demonstrates the application of a hypoplastic model in class A predictions of a NATM tunnel in an urban environment. The tunnel, excavated in a stiff clay, is 14 m wide with 6 m to 21 m of overburden thickness. The constitutive model was calibrated ...

The paper presents comparison of 2D and 3D analyses of an exploratory adit of a NATM tunnel in stiff clays using two constitutive models (hypoplastic model for clays and Mohr-Coulomb model). The stress-release factor β of 2D simulation has been optimised to ...

<p>The design of NATM tunnels are often done in two dimensions, even though there are limitations. This paper uses the results from the simulation of a NATM tunnel using finite element method in three dimensions to illustrate a few observations that may aid ...

This paper introduces a parameterised scheme for automated 3D mesh generation of highly complex tunnelling layouts using a freeware mesh generator. Comparisons are made with meshers found in commercial FE software

<p>Pipe Roof Support systems are increasingly being used in weak ground tunneling although the design is often only based on experience. The results of an intensive measurement campaign, including settlement measurements ahead of the face, were used to determine ...