<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>This paper studies the impact of overhead excavation on an existing tunnel through both field monitoring and a full 3D numerical model. It is found that the excavation induced longitudinal heave of the tunnel is uneven with maximum heave occurring below ...

<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 ...

This thesis introduces enhancements to existing techniques that improve the agreement between model predictions and both, laboratory test data and eld performance observations. Specically, the nite element simulation strategy adopted in this research incorporated ...

<p>Nonlinear finite element method and Serendipity eight nodes element are used for determining of ground surface settlement due to tunneling. Linear element with elastic behavior is used for modeling of lining. Modified Generalized plasticity model with nonassociated ...

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 uses the strongly time dependent convergence measurements from a tunnel excavated in heavily sheared flysch to estimate the creep-related rockmass parameters by 2D numerical analyses using the ABAQUS finite element code. Various techniques are evaluated ...

<p>During the design and construction of shield driven tunnels a reliable analysis of the construction process is required for the prognosis of the process induced surface settlements, the changes in soil stresses and in groundwater conditions as well as for ...