Tunnelling Contracts and Site Investigation

Dr P.B. Attewell

• Preface. Abbreviations. Tunnelling contracts and site investigation. Introduction Contracts. Initial investigation phase. Ground investigation. Contract preparation and tender evaluation. Tunnel construction. Claims and records. Post-construction phase. References. Bibliography. Supplementary information on tunnelling contracts and site investigation. Quality assurance. Hazardous gases with particular reference to those that might be encountered when tunnelling in coal measures strata. Application of Bayesian statistics to site investigation. Weak rock. Standard penetration test and cone penetration test. Mudrocks. Mineralogical composition of rock. Grout injection. Tunnelling through contaminated ground. Rock quality designation and other rock mass discontinuity descriptors. Symbols used on borehole logs. Determination of unconfined compressive strength of rock. Rising, falling and constant head permeability tests. Rock excavability via `Q'. Well-point dewatering. Estimation of the form of a long-term (ground loss plus consolidation) free-ground transverse (normal to the tunnel centre-line) surface settlement trough. The new Austrian tunnelling method. Water pollution legislation. Analysis of pressure tunnel in rock. Ground vibration and noise from civil engineering operations. Sewer and water main linings. Index.