geotechnica 2015 - nader saffari london underground

8/18/2019 Geotechnica 2015 - Nader Saffari London Underground

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Geotechnica 2015

Is Innovation the Key to Step Change forthe Geotechnical Industry

Dr Nader Saffari – London Underground


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Contents

1. Introduction to LU

2. Ground Investigation

3. Innovation

4. Conclusions


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1. Introduction to LU

The LU Network consists of approximately 463 km of track route of

which 239 km is supported by earth structures.

4 million passenger journeys per day.

During its daily peak services 540 trains run across 11 lines and 270

stations.

Capital investment programme amounting to £1.6 billion per annum inorder to increase the system's capacity by 35%.

Night tube - 24-hour service on Friday and Saturday nights

commencing September this year.

Less time available for engineering activity on the operational railway

Growing reliance on non-intrusive techniques & smart technology.


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Asset Management

Inspection

Assessment

Remedial

Works

Monitoring

Maintenance

Cyclic

MeasurementData capture

Reporting

Investigation Analysis

Report

Classification

Instrumentation

Remote data

Groundwater

Movement

Weather

Design

Construction

Routine

Heavy

Risk Assessment

Service Loss

Safety Risk

STRATA


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Geology and Ground Conditions

Terrace gravels

Alluvium

London Clay

Lambeth group

Chalk & overlying superficials

Fill derived from above

Ash


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2. Ground Investigations

Life extension of existing network, e.g.

Earth Structures

Tunnels, etc.


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Earth Structures


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Tunnels - Lambeth Group Sand Channels

The water flow can carry substantial quantities of

sand into the tunnel potentially causing operationalproblems and structural concerns


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Growing/improving the existing network, e.g.

Victoria Station Upgrade

Bond Street

Cooling the Tube


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Terrace Gravel

Made Ground

Alluvium

London

Clay

Challenging Ground Conditions - VSU


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Cooling the Tube

Mid tunnel

ventilation

Borehole

cooling


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Extending the Network, e.g.

Northern Line Extension

Croxley Rail Link

Crossrail 2


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Northern Line Extension

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Note – Temporary shafts

have been removed from

the project scope


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GI on Northern Line Extension


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2. Ground Investigation - Challenges

Access

Space

Steep slopes

Underground

Safety


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GI on or Near Track


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Windowless sampling


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2. Ground Investigation - Objectives

Geological – Stratigraphy

–Faulting

– Sand bands

– Chalk types and structure

Hydrological and hydro-geological GW Rainfall & SMD

Geotechnical design parameters

How much of the above data already exists(somewhere?)

Targeted investigation?


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2. Ground Investigation - Quality

Specification

Equipment

Skills & experience

Supervision

Data collection

Data management

Effective use of data

Team collaboration & engagement


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2. Ground Investigation - Quality

Major projects

Usually receive more attention

Routine

Often quality is compromised

Quality cost money

what is the reward? Cost saving by optimising design?

EC7?


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3. Innovation

Before

Now


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3. Innovation

Before

Now


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3. Innovation – Remote sensing

Satellite Technology – Transport InfrastructureManagement (TIM), new generation of asset monitoring

LiDAR

Laser Scanner

Drones


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3. Innovation - Laser Scanner


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Mapping of Chalk Cuttings - Abseiling


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Mapping of Chalk Cuttings – Laser Scanner


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Mapping of Chalk Cuttings – Laser Scanner


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3. Innovation - Data Management

Data collection &reporting

LU database & GIS

Data sharing

3D geology

BIM


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3. Innovation – Remote sensing

A 6ft wide drone searches Amersham

Station roof tops for any cracks or signs

of dampness

Satellite technology, Transport Infrastructure Management (TIM)


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3. Innovation in Monitoring

UtterBerry - GE Award 2015

Shape Accel Array (SAA)

Standard inclinometer


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3. Innovation - Analytical

L

H

0.7 L

Made Ground

Cutting Material(depth ofWeathered Clay)

Underlying Material

Weakened BasalLayer (refer to text

for appropriatelocation)

0.15H to 0.2H


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3. Innovation

GI ?


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3. Innovation - GI

Identify areas in need of innovation

What are the drivers

What are the barriers

Cost

Is there a business case?


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4. Conclusions

LU is involved in a capital investment programme in order to

increase the system's capacity by 35%.

There is a growing reliance on non-intrusive techniques & smart

technology.

GI plays a key role in the design, construction and management

of assets on LU Network.

The industry has made significant advances in the development

of smart infrastructure and construction over the years.

Innovation in ground investigation is required to meet the

challenges ahead.

geotechnica 2015 - nader saffari london underground

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