Volume 40 Issue 5
Oct.  2026
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HE Nengfang, ZHANG Zonghong, HU Ren, MA Jie, HE Xiaoyun. Strength characteristics of fill material for red clay soft rock roadbed[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 765-771. doi: 10.20265/j.cnki.issn.1007-2993.2025-0158
Citation: HE Nengfang, ZHANG Zonghong, HU Ren, MA Jie, HE Xiaoyun. Strength characteristics of fill material for red clay soft rock roadbed[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 765-771. doi: 10.20265/j.cnki.issn.1007-2993.2025-0158
shu

Strength characteristics of fill material for red clay soft rock roadbed

doi: 10.20265/j.cnki.issn.1007-2993.2025-0158
  • 1.

    China Communications Road and Bridge South China Engineering Co., Ltd., Zhongshan 528405, Guangdong, China

  • 2.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • Received Date: 2025-04-08
  • Accepted Date: 2025-08-25
  • Rev Recd Date: 2025-06-30
    • Available Online: 2026-10-08
  • Publish Date: 2026-10-08
    Abstract
  • To investigate the influence of particle size and moisture content on shear strength characteristics of red-bed soft rock fillers in roadbed engineering, direct shear tests were conducted on typical red-bed soft rock fillers from Guangxi region under varying particle sizes and moisture conditions, clarifying the influence of particle size and moisture content on the shear strength, brittleness, and dilatancy characteristics of red-bed soft rock fillers. The results revealed that: increasing particle size, moisture content, and vertical load promoted the transition of stress-displacement curves from softening to hardening, accompanied by increased peak shear displacement; shear strength demonstrated a characteristic peak-shape response to moisture variation, while showing monotonic decay with particle size growth; elevated vertical loads and moisture contents facilitated the shear volumetric behavior also transitioned from dilatancy to contraction; particle coarsening, moisture saturation, and load intensification collectively suppressed dilation, with coarser particles exhibiting pronounced pre-shear contraction; brittleness evolution progressed through three-phase coupling with dilation angle: softening-dilation, hardening-dilation, and hardening-contraction, governed by the increasing particle size and moisture content of red-bed soft rock fillers.

     

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