Abstract
The underconsolidated soils in reclaimed land have low strength and high compressibility, resulting in susceptibility to excessive settlement and associated negative effects, which can be controlled by grouting. However, there is little research on the mechanism of grouting in underconsolidated soil, compared with the normally consolidated or overconsolidated soil. In this study, we present a series of laboratory grouting tests to investigate the grouting mechanism and the effect of degree of consolidation, soil type, load increment ratio and initial overlying load on the grouting performance. The results showed that the influence of grouting on primary consolidation settlement for underconsolidated soil included the heave effect, the additional settlement due to the dissipation of excess pore water pressure induced by grouting and the reduced settlement due to the increased modulus induced by grouting. However, grouting in underconsolidated soil had no influence on the secondary consolidation settlement. Grouting in underconsolidated soil with low degree of consolidation could obtain a shorter time of primary consolidation and a higher final grouting efficiency in primary consolidation stage. The final grouting efficiency in primary consolidation stage increased linearly with increasing load increment ratio, but decreased with increasing initial overlying load. As the overconsolidation ratio increased, the final grouting efficiency in primary consolidation stage decreased for underconsolidated soil, dropping to the lowest value for normally consolidated soil and then increased for the overconsolidated soil, reaching a limit. Moreover, the peak grouting pressure was proportional to the vertical effective stress at the beginning of grouting.
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References
Au SKA, Soga K, Jafari MR et al (2003) Factors affecting long-term efficiency of compensation grouting in clays. J Geotech Geoenviron Eng 129(3):254–262
Au SKA, Yeung AT, Soga K et al (2007) Effects of subsurface cavity expansion in clays. Geotechnique 57(10):821–830
Casagrande A, Fadum RE (1940) Notes on soil testing for engineering purposes, vol 8. Harvard University, Cambridge
Chen B, Gong H, Li X et al (2014) Spatial correlation between land subsidence and urbanization in Beijing, China. Nat Hazards 75(3):2637–2652
Chu J, Yan SW (2005) Estimation of degree of consolidation for vacuum preloading projects. Int J Geomech 5(2):158–165
Cui ZD, Ren SX (2014) Prediction of long-term settlements of subway tunnel in the soft soil area. Nat Hazards 74(2):1007–1020
Cui ZD, Tan J (2015) Analysis of long-term settlements of Shanghai Subway Line 1 based on the in situ monitoring data. Nat Hazards 75(1):465–472
Cui QL, Wu HN, Shen SL et al (2015) Chinese karst geology and measures to prevent geohazards during shield tunnelling in karst region with caves. Nat Hazards 77(1):129–152
Ding XL, Liu GX, Li ZW et al (2004) Ground subsidence monitoring in Hong Kong with satellite SAR interferometry. Photogramm Eng Remote Sens 70(10):1151–1156
Fearon RE, Coop MR (2000) Reconstitution: what makes an appropriate reference material? Geotechnique 50(4):471–477
Feng TW, Lee JY, Lee YJ (2001) Consolidation behavior of a soft mud treated with small cement content. Eng Geol 59(3–4):327–335
Harris DI, Mair RJ, Love JP et al (1994) Observations of ground and structure movements for compensation grouting during tunnel construction at Waterloo station. Geotechnique 44(4):691–713
Kovacevic N, Potts DM, Vaughan PR (2000) The effect of the development of undrained pore pressure on the efficiency of compaction grouting. Geotechnique 50(6):683–688
Liu S, Ju J, Cai G et al (2014) Stress history estimation method of underconsolidated soil by Partial Piezocone dissipation tests. Mar Georesour Geotechnol 32(4):368–378
Mair RJ, Hight DW (1994) Compensation grouting. World Tunn Subsurf Excav 8:361–367
Marchi M, Gottardi G, Soga K (2014) Fracturing pressure in clay. J Geotech Geoenviron Eng 140(2):04013008
Schweiger HF, Falk E (1998) Reduction of settlement by compensation grouting numerical studies and experience from Lisbon underground. The World Tunnel Congress’98 on Tunnel and Metropolises, Sao Paulo, vol 2. pp 1047–1052
Schweiger HF, Kummerer C, Otterbein R et al (2004) Numerical modelling of settlement compensation by means of fracture grouting. Soils Found 44(1):71–86
Soga K, Au SKA, Jafari MR et al (2005) Laboratory investigation of multiple grout injections into clay. Geotechnique 55(3):257–258
Sun F, Zhang DL, Wang C (2010) Analysis of raising pipeline by fracture grouting and its application. Rock Soil Mech 31(3):932–938 (in chinese)
Sun L, Jia T, Zhuo R et al (2015) Numerical solutions for consolidation of under-consolidated dredger fill under vacuum preloading. J Coast Res 73:277–282
Tong F, Yin JH, Pei H (2012) Experimental study on complete consolidation behavior of Hong Kong marine deposits. Mar Georesour Geotechnol 30(4):291–304
Towhata I, Ryull KS (1990) Undrained strength of underconsolidated clays and its application to stability analysis of submarine slopes under rapid sedimentation. Soils Found 30(1):100–114
Wang SY, Chan D, Lam KC (2009) Experimental study of the effect of fines content on dynamic compaction grouting in completely decomposed granite of Hong Kong. Constr Build Mater 23(3):1249–1264
Wang SY, Chan DH, Lam KC et al (2013) A new laboratory apparatus for studying dynamic compaction grouting into granular soils. Soils Found 53(3):462–468
Younis MA (1994) Small scale physical modeling of compaction grouting. Master’s Thesis, The University of Mary land, College Park
Zhang D, Fang Q, Hou Y et al (2013) Protection of buildings against damages as a result of adjacent large-span tunneling in shallowly buried soft ground. J Geotech Geoenviron Eng 139(6):903–913
Zhao Q, Lin H, Gao W et al (2011) InSAR detection of residual settlement of an ocean reclamation engineering project: a case study of Hong Kong International Airport. J Oceanogr 67(4):415–426
Zheng G, Zhang XS (2015) Laboratory experimental study on the effect of overlying load on the long-term effectiveness of grouting uplift in soft clay. Chin J Geotech Eng. http://www.cnki.net/kcms/detail/32.1124.TU.20150916.1819.022.html. Accessed 16 Sept (in Chinese)
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Zheng, G., Zhang, Xs., Diao, Y. et al. Experimental study on grouting in underconsolidated soil to control excessive settlement. Nat Hazards 83, 1683–1701 (2016). https://doi.org/10.1007/s11069-016-2383-0
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DOI: https://doi.org/10.1007/s11069-016-2383-0