## Corrigendum

Page 45, 2nd paragraph: "A rule of thumb is that a soil with a permeability less than 10−7 to 10−8 m/s will behave in an undrained manner during the timescale of a typical tunnel construction, and a soil with higher permeability will behave in a drained manner (Anagnostou & Kovári, 1996)" - This should say 10-6 to 10-7 m/s.

Page 171, text before Equations 6.13 and 6.14 - this got muddled up with the text before Equations 6.15 and 6.16 on page 172. It should say (thankyou to Avantika Raj for spotting this one):

Page 249, Table 8.1 - this table, from ITAtech Report no.7 'Design guidance for precast fibre-reinforced concrete segments - Vol.1: Design aspects', contains incorrect numbers and should be ignored. The embodied CO2 of polypropylene synthetic fibres should be approximately 1800-2200 kgCO2/tonne. For steel fibres and conventional steel bars, the range can be approximately 800-2500 kgCO2/tonne. At the same time, each type of reinforcement provides a different performance and cannot be directly compared. Therefore, it is better to ignore this table altogether.

Page 333, last paragraph, first sentence - 'delection' should say 'deflection'.

Page 418, Figure 12.2 - Legend on figure should refer to Worked Example 12.1 and 12.3 (not 11.1 and 11.3).

Page 452, Equation 12.40 - This equation is the same as one proposed by Barry New in a short article in Tunnels & Tunnelling International in September 2017. Apologies to Dr New for not giving acknowledgement, I missed this article and came up with the same expression independently.

Page 490, Worked Example 13.2 - The sagging zone resultant diagonal strain of 0.039% should result in Damage Category 0 - 'negligible' (not Damage Category 1 - 'very slight').

Page 522, Equation A.14 - The 'exp' should not be there and the equation should be as shown below. This has no impact on any other equations. Thankyou to Rui Pontes for finding this one.

Page 528, Equation A.34 - Since the right hand side of this equation is just a substitution for the average shear stress using Equation A.31, there should be a term for cohesion c and Equation A.34 should look like this:

Page 531 - The value for Gs should be 2665.24 kN. This is a typo and the other values and Figure A.7 are correct. Thankyou Berk Demir for spotting this and the previous error.