E-mail : yupeng@polyu.edu.hk

Academic qualifications

  • Ph.D. in Civil Engineering, Chongqing University, China, 09/2017 – 06/2021
  • M.Sc. in Geotechnical engineering, Lanzhou University, China, 09/2014 – 06/2017
  • B.Sc. in Geological Engineering, Lanzhou University, China, 09/2010 – 06/2014

Professional experience (University)

  • Postdoc fellow, The Hong Kong Polytechnic University, Hong Kong, China, 06/2021 – present

  • Research interests

    • Particle breakage in geotechnical engineering.
    • Pile-soil interaction.
    • Engineering properties of bentonite-sand mixtures as buffer materials.
    • Loess improvement.

    Topic 1:The dyeing tracking and particle image segmentation method and new breakage indexes

    • Contribution: Broken particles and the unbroken particles in each size range are distinguished and be traced back. The relationship between breakage modes and detailed particle breakage is found. New indexes reflected the detailed particle survival probability in each size ranges are proposed.
    • Significance: Improving the accuracy of particle breakage research, promoting the mechanisms study of particle breakage.

    • Peng Y, Ding XM, Xiao Y, Deng X, Deng WT. Detailed amount of particle breakage in non-uniformly graded sands under one-dimensional compression[J]. Canadian Geotechnical Journal, 2020, 57(8): 1239-1246.
    • Peng Y, Ding XM, Zhang Y, Wang CL, Wang CY. Evaluation of the particle breakage of calcareous sand based on the detailed probability of grain survival: An application of repeated low-energy impacts[J]. Soil Dynamics and Earthquake Engineering, 2020:106497.
    • Peng Y, Ding XM, Xiao Y, Chu J, Deng WT. Study on particle breakage property of calcareous sand by dyeing tracking and particle image segmentation method[J]. Rock and Soil Mechanics, 2019,40(7), 2663-2672.

    Topic 2:The pile-soil interaction in sand ground considering the particle breakage

    • Contribution: A positive feedback cycle mechanism was proposed to interpret the "abrupt settlement" of pile in sand foundation; discovered the evolution laws of particle breakage zones from a mesoscopic level.
    • Significance: Several phenomenon in engineering practice were explained successfully; promoting the mechanisms study of pile-soil interaction.

    • Peng Y, Liu HL, Li C, Ding XM, Deng X, Wang CY. The detailed particle breakage around the pile in coral sand[J]. Acta Geotechnica, 2021. DOI:10.1007/s11440-020-01089-2.
    • Peng Y, Liu JY, Ding XM, Fang HQ, Jiang CY. Performance of X section concrete pile group in coral sands under vertical loading[J]. China Ocean Engineering, 2020,34(5): 621–630.
    • Ding XM, Deng WT, Peng Y*, Zhou H. Bearing behavior of cast-in-place expansive pile in coral sand under vertical loading[J]. China Ocean Engineering, 2021.

    Topic 3:Workability improvement of bentonite buffer material for HLW disposal

    • Contribution: Relationships between agglomerates brought by uneven water content, homogeneity of compacted bentonite, and poor engineering properties are established; a quantification formula for water content inhomogeneity evaluation in soil is proposed.
    • Significance: Uneven water content distribution problem of the bentonite blocks is solved for high-level radioactive waste disposal.

    • Peng Y, Zhang HY, Yang BZ, Wang XW, Shao XX, Liu P. Ice-bentonite powder mixing method to improve the homogeneity of compacted bentonite in an initial sample preparation stage[J]. Clays and Clay Minerals, 2016, 64(6), 706-718.
    • Zhang HY, Peng Y, Wang XW, Zhao BZ, Liu P. Research on ice-soil mixed method to adjust water content of bentonite as buffer/backfill material[J]. Rock and Soil Mechanics, 2016.

    Topic 4:Property of Loess Soil Modified by Consolid System and the Micro Stabilization Mechanism

    • Contribution: The balance between improving water resistance property and keeping good water discharge ability was acquired for loess soil.
    • Significance: Has a potential value for the reinforcement of earthen sites.

    • Peng, Y., Zhang, H. Y., Lin, C. B., Wang, X. W., & Yang, L. (2017). Engineering properties and improvement mechanism of loess soil modified by consolid system. Chinese Journal of Rock Mechanics and Engineering, 34, 3574-3580., 36(3), 762-772.
    • Zhang HY, Peng Y, Wang XW, Ling C. Water entrance-and-release ability of loess soil modified by consolid system[J]. Rock and Soil Mechanics, 2016.

    Topic 5:Micromechanical analysis of the particle corner breakage effect on pile penetration resistance and formation of breakage zones in coral sand

    • Contribution: Relationships between corner breakage and effective contacts, the force transmission in soil is newly generated, allowing interpretation of the sharp decrease of pile friction-bearing capacity.
    • Significance: sheding light on the microscopic mechanism of pile penetration in crushable granular 25 soils, offering guidance for evaluating the ground-bearing capacity of angular granular soils.

    • Peng Y, Yin ZY*, Ding XM, 2021. Micromechanical analysis of the particle corner breakage effect on pile penetration resistance and formation of breakage zones in coral sand . Ocean engineering. (under review)

    Topic 6:Mechanism analysis of the corner breakage effects on pile penetration in coral sand by laboratory model test and three-dimensional DEM method

    • Contribution: Sharp turn of skin friction, pile shaft soil behavior, microscopic contacts at pile-soil interface, and the controversial particle breakage zone around the pile tip are analyzed to explore the pile-soil interaction mechanism in angular granular soils.
    • Significance: demonstrating corner breakage not only affects the magnitude of various actions around piles but also changes mode of contact and failure behaviors.