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WG100 05.10.2016 1

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Content of Presentation:

A Introduction of our WorkpaperB Experiment for a Mnemonic

WG 100 Excavations

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WG 100 Excavations

Working Group

Harald Scheer, Helvetia, ChairDevrim Aksar, Anadolu SigortaMartyn Francklow, CTC plcAlon Eisenberg, Engineers, Surveyors

& LAs Karsten Wehde, HDI-Gerling Alvaro Hernandez, Qatar General

Insurance Daryl Robinson, Swiss Re Jens Bosselmann, Helvetia

Richard Radevsky, Charles Taylor – IMIA Executive Committee Sponsor

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Content

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Content

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Cause for WG 100:- Increasing demand for high-density development- Maximum utilisation of ground area results in deeper

excavations in crowded cities- Strong impact on high value surroundings

Our Intention:- Overview about different types of excavations- Relevant elements of such construct- Underwriting recommendations

Cause and Intention

TPL

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1. Types of Excavations

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2. Geotechnical Considerations

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3. Surroundings/Terrain/Location

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4. Wording Considerations/Endorsements

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5. Loss Examples

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5. Loss Examples

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5. Loss Examples

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6. Summary

6.1 Underwriter’s Guidance6.2 Risk Management Recommendations6.3 Conclusions

7. References

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B Experiment for a Mnemonic

Once upon a time….

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2. Experiment for a Mnemonic

« The one who

is not afraid of water

is an Idiot! »Wolfgang Bartsch

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Mnemonic

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Mnemonic

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Mnemonic

The one whois not afraid of wateris an Idiot!

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Mnemonic

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Small problem, huge impact!

Wetted surface of a pit (without ground area)

H=5m

B=30mL=40m

Wetted surface: 2 x 5 x (30+40) = 700 sqmLeakage estimated 0.5 sqm < 0.1%

Mnemonic

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The fatal chain:Water flow – velocity – inner erosion of soil –first fine particles are washed out, then sand andgravel -this results in an increasing watervolume and thisin return in an increasing capacity for soil-transport

It’s a non healing automatic self-accelerating process!

Mnemonic

Thank you

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