Civil Engineering Association

Journal for Numerical and Analytical Methods in Geomechanics - Requested Papers

Seismic bearing capacity of shallow foundations near rock slopes using the generalized Hoek–Brown criterion

The seismic bearing capacity of shallow foundations resting on a modified Hoek–Brown rock mass is investigated within the framework of the kinematic approach of limit analysis theory. The analysis focuses on evaluating the reduction in bearing capacity induced by seismic loading and by the proximity of a rock slope. A pseudo-static approach is adopted to account for the earthquake effects for the seismic bearing capacity evaluations. At the rock material level, the closed-form expressions previously obtained for the support functions of the rock failure criterion allow the implementation of different failure mechanisms families, and thus to derive rigorous upper bounds estimates of the load-bearing capacity in both static and seismic conditions. The effects of geometrical, strength and loading parameters are assessed through a large number of parametric computations. Finally, design tables are presented for practical use in rock engineering.

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Numerical modelling of compensation grouting above shallow tunnels

This paper describes the development of a numerical model for compensation grouting which is a useful technique for the protection of surface structures from the potentially damaging movements arising from tunnel construction. Pipes are inserted into the ground between the tunnel and the overlaying structure from an access shaft. Buildings on the surface are instrumented and movements are carefully monitored. Once the deformations exceed a certain Trigger Level, grout is injected into the ground to prevent damage. In the finite element model described here, compensation grouting is modelled by applying an internal pressure to zero-thickness interface elements embedded in the mesh. An ‘observational algorithm’ is used, where the deformations of the surface are monitored and used to control the injection process. Example analyses of compensation grouting are given for three-dimensional tunnel construction underneath a greenfield site. Different strategies are used to control the injection process and their effectiveness in preventing surface movement is assessed. The numerical model is shown to replicate general behaviour expected in the field and is capable of modelling the control of ground surface movements at a greenfield site.

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A simplified analysis method for piled raft foundations in non-homogeneous soils

Numerical analysis of piled rafts

Analysis of piled raft systems in layered soil

Analysis of piled rafts

4 papers inside

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Effective block diagonal preconditioners for Biot's consolidation equations in piled-raft foundations

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Design of raft–pile foundation using combined optimization and finite element approach

A simplified analysis method for piled raft and pile group foundations with batter piles

Elastoplastic multiphase model for simulating the response of piled raft foundations subject to combined loadings

All three papers

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A Winkler model approach for vertically and laterally loaded piles in nonhomogeneous soil

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