Future Evening Meetings

The BTS holds monthly evening meetings from September to June, generally on the third Thursday of the month. Unless otherwise stated, the meetings are at the Institution of Civil Engineers (ICE) with the lecture starting at 6pm. Additional meetings are arranged by the BTS Young Members, by regional groups and as joint meetings with other societies. Click on the calendar icon to place this meeting in your Outlook calendar and click on the download button for a copy of the flyer.


BTSYM September Meeting: Evaluation of the bearing capacity of fibre reinforced concrete sections under fire exposure

The presentation will look at evaluation of the bearing capacity of fibre reinforced concrete (FRC) sections, without any traditional steel reinforcement, subjected to different values of the fire duration. The presentation will also provide an approach to define bending moment–axial force interaction envelopes, through an analytical model based on the direct integration of the hot or residual mechanical properties of the material, throughout the member cross section. Finally, a parametric survey, specifically related to tunnel segments, with different geometries and FRC materials will also be shared to highlight the worst (or better) scenarios.


PhD. Fabio Di Carlo, University of Rome "Tor Vergata"

Thames Tideway West: The Design and Construction of Hammersmith Connection Tunnel

The Hammersmith Connection Tunnel forms part of the £4.2billion pound Thames Tideway scheme. The tunnel will intercept sewer flows from the Hammersmith Pumping Station, where on average 2 million m3 of untreated sewage is discharged into the River Thames each year. The design of the tunnel includes a sprayed concrete primary lining and cast in place secondary lining. The waterproofing philosophy adopted by the designer omitted the need for a traditional waterproof membrane between the primary and secondary linings. Instead a crystallisation agent was specified and incorporated in the primary lining, with the aim of improving the permeability of the section and watertighness of the sprayed concrete joints. The ability of this crystallization agent to limit water ingress was verified through a programme of pre-construction testing. This testing proved that an admixture dosage of 5kg/m3 was sufficient to satisfy the design. During the construction of the tunnel a number of key innovations were implemented by the project team. These included the use of a fully hydrostatic PLC driven formwork system to cast the tunnel secondary lining. The presentation with discuss this innovation plus others, whilst providing a detailed overview of both design and construction aspects of the works.


Ed Batty, Tunnels Agent (Bam Nuttall). Peter Coppenhall, Designer Representative (Morgan Sindall Engineering Solutions).

Tunnelling Under 21st Century Building Structures is not easy: Bond Street Station Upgrade and the infamous case of Avon House

Please note this event is taking place at the University of Northumbria. Bond Street Station Upgrade was a complex project to extend the existing London Underground station with significant tunnelling and underground works to provide a new satellite ticket hall to the north of Oxford Street in London UK with an associated plethora of new passenger and station interchange tunnels. It was completed for Christmas 2017. Building Damage Assessment was undertaken to ensure that appropriate action was considered to reduce the effect on the above ground buildings from the ground movements arising from tunnelling works. One of these buildings, known as Avon House, is a 1930’s steel framed building, altered over a number of years by the insertion of transfer beams in the upper floors to allow a more open space for this important Oxford Street Retail area. Archive searches, supplemented by 3D Modelling and supplementary geotechnical and structural investigation, allowed the contractor, and his key sub-contractor, to make appropriate measures to protect the building during tunnelling. The presentation will describe the scheme, the building damage assessment and the mitigation taken from three members of the project team.


Andy Clarke, Costain; Richard Totty, Bachy Soletanche; Paul Perry, Hewson Consulting Engineers

BTS October Meeting: Encountering a large Drift Filled Hollow on the Lee Tunnel


Tim Newman, John Corcoran, Jackie Skipper

BTS November Meeting: Harding Memorial Lecture


Bruno Coombe

BTS December Meeting: Tideway TBM Delivery

At Greenwich Pumping Station, a large acoustic enclosure is being constructed over a diaphragm wall drop shaft in preparation for TBM delivery and lowering to construct the mega Tideway Tunnel. However existing underground tunnels must be protected from the delivery loading of the TBM. In particular a maze of deep existing brick sewers and underground sewerage chambers had to be protected from TBM transiting directly overhead. This presentation will give a detailed review of the inception, design, construction and full scale load testing of a pile assist RC raft protection system, which also doubles up as the foundation of the acoustic enclosure and gantry cranes for TBM delivery.


Yueyang Zhao, Wentworth House