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Interpretation of Soil–Cement Properties and Application in Numerical Studies of Ground Settlement Due to Tunneling Under Existing Metro Line

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Abstract

Uncertainty of properties of improved soft ground with chemical grouting often results in discrepancy between simulated results and observed data and makes prediction for ground subsidence difficult. It also made practice usually adopts unconfined compressive strength of soil–cement mixtures as design control criterion. This paper presents a methodology to interpret the strength and deformation parameters from unconfined compressive strength of soil–cement mixtures for advanced numerical analysis which is widely used in reinforcing the soft ground and pre-supporting excavation. Observed data are used to compare with the simulated results and validate the interpretations. Numerical experiments with two-dimensional finite element model for covered undercutting of large cross-sectional twin tunnel under an existing subway station are presented. Issues with respect to design and construction of excavation that potentially affect the ground surface subsidence are explored. It was found that the ground subsidence caused by tunneling in soil–cement medium under existing subway station is similar to that in a greenfield site but with flatter settlement trough. Unconfined compressive strength of soil–cement mixtures ranging from 1.5 to 2.0 MPa can significantly reduce the settlement to an acceptable control criterion. Settlement magnitude is influenced by pillar width but not obviously by the location of umbrella arch installed in twin tunnels.

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Authors and Affiliations

  1. Department of Civil Engineering, Tianjin Key Laboratory of Soft Soils and Engineering Environment, Tianjin Chengjian University, Tianjin, 300384, China

    Dongyuan Wang

  2. Department of Engineering Technology, Texas Southern University, Houston, TX, USA

    David Olowokere

  3. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai, China

    Lulu Zhang

Authors
  1. Dongyuan Wang
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  2. David Olowokere
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  3. Lulu Zhang
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Correspondence to Dongyuan Wang.

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Wang, D., Olowokere, D. & Zhang, L. Interpretation of Soil–Cement Properties and Application in Numerical Studies of Ground Settlement Due to Tunneling Under Existing Metro Line. Geotech Geol Eng 32, 1275–1289 (2014). https://doi.org/10.1007/s10706-014-9803-2

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  • DOI: https://doi.org/10.1007/s10706-014-9803-2

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