Ultrasonic measurements for assessing the elastic parameters of two-component grout used in full-face mechanized tunnelling

Agrò, G., Lo Giudice, E., Sacco, M.M., 2009. Il modulo elastico statico e dinamico del calcestruzzo. In: Proceedings - Conferenza Nazionale AIPnD - Prove non Distruttive Monitoraggio Diagnostica, Roma (I), 19 October 2009. Antunes, P., 2012. Testing procedures for two-component annulus grouts. In: Proceedings - North American Tunneling Conference NAT 2012, Indianapolis (USA), 24–27 June 2012, pp. 14–22. ASTM, 2016 Aydin, 2014, Upgraded ISRM suggested method for determining sound velocity by ultrasonic pulse transmission technique, Rock Mech. Rock Eng., 47, 255, 10.1007/s00603-013-0454-z Basu, 2006, Evaluation of ultrasonic testing in rock material characterization, Geotech. Test. J., 29, 117 CEN, 2004. Testing concrete. Determination of ultrasonic pulse velocity. EN 12504–4:2004. European Committee for Standardization, Bruxelles (B). CEN, 2016. Methods of testing cement - part 1: determination of strength. EN 196–1:2016. European Committee for Standardization, Bruxelles (B). Càmara, J.R., 2018. Use of two-component mortar in the precast lining backfilling of mechanized tunnels in rock formations. In: Proceedings - ITA-AITES World Tunnel Congress 2018, Dubai (UAE), 20–26 April 2018. Dal Negro, E., Boscaro, A., Barbero, E., Darras, J., 2017. Comparison between different methods for backfilling grouting in mechanized tunneling with TBM: technical and operational advantages of the two-component grouting system. In: Proceedings - AFTES International Congress 2017, Paris (FR), 13–16 November 2017. EFNARC, 2005 Green, R.E., 1991. Ultrasonic Testing (Nondestructive Testing Handbook). American Society for Nondestructive. chapter Introduction to Ultrasonic Testing. pp. 1–21. Hashimoto, T., Brinkman, J., Konda, T., Kano, Y., Feddema, A., 2004. Simultaneous backfill grouting, pressure development in construction phase and in the long-term. In: Proceedings - ITA-AITES World Tunnel Congress 2004, Singapore (SG), 22–27 May 2004. ISRM, 1977. Suggested methods for determining sound velocity. Technical Report. International Society for Rock Mechanics: Commission on Standardization of Laboratory and Field Test. ITATech, 2014. ITAtech guidelines on best practices for segment backfilling. Technical Report 4 – May 2014. ITATech Activity Group Excavation, ITA-AITES, Châtelaine (CH). Ivantchev, A., Del Rio, J., 2015. Two-component backfilling grouting for double shield TBMs. In: Proceedings - ITA-AITES World Tunnel Congress 2015, Dubrovnik (HR), 22–28 May 2015. Khan, 2011, Measurement of dynamic properties of stiff specimens using ultrasonic waves, Can. Geotech. J., 48, 1, 10.1139/T10-040 McCann, 2001, Review of NDT methods in the assessment of concrete and masonry structures, NDT&E Int., 34, 71, 10.1016/S0963-8695(00)00032-3 Novin, A., Tarighazali, S., Forughi, M., Fasihi, E., Mirmehrabi, S., 2015. Comparison between simultaneous backfilling methods with two components and single component grouts in EPB shield tunneling. In: Proceedings - ITA-AITES World Tunnel Congress 2015, Dubrovnik (HR), 22–28 May 2015. Peila, 2011, The behaviour of a two-component backfilling grout used in a tunnel-boring machine, Acta Geotech. Sloven., 8, 5 Peila, 2015, Long term behavior of two component back-fill grout mix used in full face mechanized tunneling, Geoingegneria Ambientale e Mineraria, 144, 57 Pelizza, S., Peila, D., Borio, L., Dal Negro, E., Schulkins, R., Boscaro, A., 2010. Analysis of the performance of two-component back-filling grout in tunnel boring machines operating under face pressure. In: Proceedings - ITA-AITES World Tunnel Congress 2010, Vancouver (CA), 14–20 May 2010. Pelizza, S., Peila, D., Sorge, R., Cignitti, F., 2012. Geotechnical aspects of underground construction in soft ground. Taylor&Francis. chapter Back-fill grout with two component mix in EPB tunneling to minimize surface settlements: Rome metro - Line C case history. pp. 291–299. Pellegrini, 2009, Sao Paulo Metro project - control of settlements in variable soil conditions through EPB pressure and bicomponent backfill grout, Proc. - Rapid Excavation Tunnel. Conf., 2009, 1137 Popovics, 2003, NDE techniques for concrete and masonry structure. progress in structural engineering and materials, Prog. Struct. Mat. Eng., 5, 49, 10.1002/pse.146 Schulte-Schrepping, C., Breitenbücher, R., 2019. Two-component grouts with alkali-activated binders. In: Proceedings - ITA-AITES World Tunnel Congress 2019, Naples (I), 3–9 May 2019. Shah, 2018, Numerical study on backfilling the tail void using a two-component grout, J. Mater. Civ. Eng., 30, 10.1061/(ASCE)MT.1943-5533.0002175 Strurrup, 1984, Pulse velocity as a measure of concrete compressive strength, in-situ non-destructive testing of concrete, 201 Thewes, M., Budach, C., 2009. Grouting of the annular gap in shield tunneling – an important factor for minimisation of settlements and production performance. In: Proceedings - ITA-AITES World Tunnel Congress 2009, Budapest (HU), 23–28 May 2009. Todaro, 2020, Short term strength behavior of two-component backfilling in shield tunneling: comparison between standard penetrometer test results and UCS, Geoingegneria Ambientale e Mineraria, 159, 33 Todaro, C., Bongiorno, M., Martinelli, D., 2021. Two-component backfilling technology: a comparison study between laboratory and job site scales. Accepted for AFTES International Congress 2021, Paris (FR), 6–8 November 2021. Todaro, C., Peila, L., Luciani, A., Carigi, A., Martinelli, D., Boscaro, A., 2019. Two component backfilling in shield tunneling: laboratory procedure and results of a test campaign. In: Proceedings - ITA-AITES World Tunnel Congress 2019, Naples (I), 3–9 May 2019, pp. 3210–3223. doi:10.1201/9780429424441-340. Youn, 2014, Influencing parameters of the grout mix on the properties of annular gap grouts in mechanized tunneling, Tunn. Undergr. Space Technol., 43, 290, 10.1016/j.tust.2014.05.021 Zarei, 2019, A testing procedure for determining ultrasonic wave velocity, Bollettino di Geofisica Teorica ed Applicata, 60, 433 Zarrin, A., Zare, S., Jalali, S.M.E., 2015. Backfilling grouting with two-component grout - case study Tehran Metro Line 7 east-west lot. In: Proceedings - ITA-AITES World Tunnel Congress 2015, Dubrovnik (HR), 22–28 May 2015.