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Springerplus. 2016 Aug 03;5(1):1252. doi: 10.1186/s40064-016-2707-2. eCollection 2016.

Research on dynamic creep strain and settlement prediction under the subway vibration loading.

SpringerPlus

Junhui Luo, Linchang Miao

Affiliations

  1. Institute of Geotechnical Engineering of Southeast University, Nanjing, 210096 China.

PMID: 27536535 PMCID: PMC4972806 DOI: 10.1186/s40064-016-2707-2

Abstract

This research aims to explore the dynamic characteristics and settlement prediction of soft soil. Accordingly, the dynamic shear modulus formula considering the vibration frequency was utilized and the dynamic triaxial test conducted to verify the validity of the formula. Subsequently, the formula was applied to the dynamic creep strain function, with the factors influencing the improved dynamic creep strain curve of soft soil being analyzed. Meanwhile, the variation law of dynamic stress with sampling depth was obtained through the finite element simulation of subway foundation. Furthermore, the improved dynamic creep strain curve of soil layer was determined based on the dynamic stress. Thereafter, it could to estimate the long-term settlement under subway vibration loading by norms. The results revealed that the dynamic shear modulus formula is straightforward and practical in terms of its application to the vibration frequency. The values predicted using the improved dynamic creep strain formula closed to the experimental values, whilst the estimating settlement closed to the measured values obtained in the field test.

Keywords: Dynamic characteristics; Dynamic creep strain; Dynamic shear module; Dynamic triaxial test; Settlement

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