36. Classification and assessment of chalk on the M25 around the Gade valley, Kings Langley, Hertfordshire

Introduction

Geology

Geotechnical Properties of Chalk

Mundford Classification (After Wakeling 1970)

Ground Investigation

TRRL LR806 Classification (After Ingoldby and Parsons 1977)

Excavation and Laboratory Test Results

Fill Performance, Traffickability and Laboratory Test Results

Discussion of the Classifications and Laboratory Test Results

Suggested Alternative Method of Classification

Discussion of the DTp Specification for Chalk (6th Edition 1986).

Problems with Classification Systems for Chalk

Acknowledgements