Field Measurements and Finite-Element Method Simulation of a Tunnel Shaft Constructed by Pneumatic Caisson Method in Shanghai Soft Ground

Evaluation of the blocking effect of retaining walls on groundwater seepage in aquifers with different insertion depths

“…However, the fundamental mechanism and quantitative influences are still not well understood (Davis and Horswill, 2002;Peng et al, 2011). Moreover, for a specific aquifer the effective insertion depth of a retaining structure to achieve a designated groundwater level with the least harmful impact on environment should be clarified.…”

“…Some deep excavations have been constructed in areas under poor geotechnical conditions, such as subsoil mainly consisting of soft deposits with a high groundwater water level (Shen et al, 2003(Shen et al, , 2010Du et al, 2009;Peng et al, 2011;Chen et al, 2013;Wang et al, 2013). The soft deposits along the east coast of China are part of the alternated multi-aquifer-aquitard system (MAAS), with large thickness of aquifers (Xu et al, 2008(Xu et al, , 2009(Xu et al, , 2012a(Xu et al, , 2012bShen and Xu, 2011).…”

Jet grouting for mitigation of installation disturbance

“…Ground modification technologies based on chemical reactions, such as deep mixing (Chen et al, 2013;Han et al, 2007;Horpibulsuk et al, 2011;Huang and Han, 2009;Shen et al, 2008) and jet grouting (Bergado and Lorenzo, 2003;Brill et al, 2003;Burke, 2004;Essler, 2012;Guatteri et al, 2012;Ho, 2009;Koshima and Guatteri, 2006;Mihalis et al, 2004), are commonly adopted for mitigating ground movement or improving excavation stability associated with infrastructure construction in soft soil deposits (Peng et al, 2011;Tan and Li, 2011;Tan and Wei, 2012;Xu et al, 2008Xu et al, , 2013aXu et al, , 2013bYin et al, 2010Yin et al, , 2013. In jet grouting, fluid is injected through small-diameter nozzles into the subsoil at high speed to erode the soil around the rod.…”

Quantitative Analysis of Soil Displacement Induced by Ground Loss and Shield Machine Mechanical Effect in Metro Tunnel Construction

“…Celestino et al [14] and many other researchers [15][16][17][18][19] noted that Peck's empirical formula cannot accurately describe soil settlement trough in many cases and proposed improved empirical formulas under different geologic conditions. Besides empirical solution, there are also many researchers who contribute significantly through analytical solution [20][21][22][23], numerical simulation [24][25][26] and model testing [27,28]. In terms of mechanical effect factors, Mindlin's solution is one of the well-known solutions to calculate the stress and displacement caused by a point load at an embedment depth in an elastic half-space [29].…”