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

Peng, Fang-Le; Wang, Hailin; Tan, Yi; Zhang, Xu; Li, Yaoliang

doi:10.1061/(asce)gt.1943-5606.0000460

Cited by 78 publications

(11 citation statements)

References 3 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Shen

et al. 2014

Engineering Geology

124

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Shen

et al. 2014

Engineering Geology

124

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Jet grouting for mitigation of installation disturbance

Wang

Shen

et al. 2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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To reduce the impact of installation of horizontal jet grouting columns on surrounding ground, a new horizontal jet grouting technique termed controlled discharge horizontal jet grouting is developed. A field trial programme is conducted to verify the application of the technique technology. Field measurements of ground surface displacement and induced excess pore-water pressures are obtained during implementation of the technique. Five trial jet grout columns are installed at 2 m below the ground surface and subsequently exposed for measuring and testing. The observed vertical displacements of the ground surface range from 0 . 4 to 9 . 4 mm, with maximum excess pore-water pressures generated during the field trial varying between 3 . 5 and 25 . 6 kPa. The diameters of the exposed jet grout columns range from 1 . 1 to 1 . 4 m. Core samples extracted from the trial jet grout columns indicate that the quality of the jet-grouted soil formed is good, with total core recovery of 70-95% and rock quality designation of 79-92%.Unconfined compressive strength tests show that the 28-d strength ranges from 0 . 9 to 1 . 5 MPa, and Young's modulus at 50% failure load (E 50 ) is between 61 . 5 and 145 . 3 MPa. The field trial results confirm the applicability of the technique for achieving low-impact installation of horizontal jet grouting.

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“…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].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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In order to relieve the increasing ground traffic pressure in the process of urbanization in China, it is inevitable to build more metro lines. However, the stratum movement caused by tunneling affects the safety of adjacent underground structures and aboveground buildings. Therefore, how to evaluate and control the stratum movement is a prominent problem. In this paper, based on the engineering project of an interval tunnel between Shizishan Station and Chuanshi Station in Chengdu Metro Line 7, China, the action mechanism of stratum movement induced by shield tunneling is analyzed, and the effect factors are divided into two categories: ground loss factors and mechanical factors. Combining the advantages of Loganathan method and mirror source-sink method, a new solution of three-dimensional displacement induced by ground loss is proposed. Based on the elastic half-space Mindlin model, the displacement at any point induced by four mechanical effect factors is deduced. Finally, the total displacement is verified by field monitoring data and quantitative analyzed in various parts.

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

Cited by 78 publications

References 3 publications

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

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

Jet grouting for mitigation of installation disturbance

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

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