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2019 Vol. 25, No. 3
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Ji DONG, Jun CHEN, Zhonghu WU, Heng YANG, Taixu CHEN. EXPERIMENTAL STUDY ON THE SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF LIGNIN-FIBER RED CLAY[J]. Journal of Geomechanics, 2019, 25(3): 421-427. doi: 10.12090/j.issn.1006-6616.2019.25.03.039
Citation: Ji DONG, Jun CHEN, Zhonghu WU, Heng YANG, Taixu CHEN. EXPERIMENTAL STUDY ON THE SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF LIGNIN-FIBER RED CLAY[J]. Journal of Geomechanics, 2019, 25(3): 421-427. doi: 10.12090/j.issn.1006-6616.2019.25.03.039
shu

EXPERIMENTAL STUDY ON THE SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF LIGNIN-FIBER RED CLAY

  • 1.

    Resources and Environmental Engineering College, Guizhou university, Guiyang 550025, Guizhou, China

  • 2.

    School of Traffic Engineering, Guizhou Institute of Technology, Guiyang 550003, Guizhou, China

  • 3.

    College of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou, China

Received Date:  10 October 2018
Revised Date:  14 December 2018
    Abstract
  • The pollution of geomaterials is one of the key problems in construction. Considering proportion of lignin fibre, laboratory mechanics experiments and SEM tests were applied to natural red clay and lignin fibre-adding red clay. Variation laws of strength characteristics and effects were studied when added volumes were various. The results showed that:lignin fibre could enhance the compression modulus of red clay under different press levels and the results appeared regularly changing; cohesive strength of red clay increased first then decrease with the increase of lignin fibre. Interlock forces that formed between lignin fibre and soil particle were less than joint force existing in skeletal structure of natural red clay, which could not enhance the soil strength when mixing amount was under 1%. Cohesive strength showed maximum, but the internal friction angle remained stable when the mixing amount was 2%; stressed red clay containing lignin fibre showed bulging deformation without obvious fracture surface. Hence, tension failure and adhering failure didn't exist in red clay containing lignin fibre and presented typical properties of strain hardening; red clay containing lignin fibre could enhance the residual strength effectively.
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