(1. School of Emergency Management, Xihua University, Chengdu, Sichuan 610039, China; 2. Sichuan Fast Fire Safety Assessment Co., Ltd., Chengdu, Sichuan 610036, China; 3. National Dam Safety Research Center, Wuhan, Hubei 430010, China; 4. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu,
Sichuan 610059, China; 5. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute
of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 6. Changjiang Survey,
Planning, Design and Research Co., Ltd., Wuhan, Hubei 430010, China; 7. School of Architecture and Civil
Engineering, Xihua University, Chengdu, Sichuan 610039, China)
Abstract：Crushed stone strength and particle breakage are critical factors influencing the shear behavior of soil-rock mixtures (SRM). To investigate the interaction mechanisms between rock strength, particle breakage, and shear characteristics, dyed mortar was employed to fabricate crushed stones of varying strengths, thereby preparing pure SRM. Stacked ring shear tests and sieve analyses were conducted to examine their shear behavior and particle breakage characteristics, accompanied by a proposed cumulative maximum breakage index . The results indicate that: (1) Increased crushed stone strength enhances dilatancy while reducing contraction in SRM. Particle breakage diminishes SRM dilatancy, revealing a critical dilatancy threshold under minimum top pressure. (2) Particle breakage primarily generates first-order debris, with the medium-size fraction exhibiting the highest degree of breakage, which is inconsistent with initial content distributions. (3) Higher unconfined compressive strength ( ) of crushed stone increases both the internal friction angle ( ) and the linear component of shear strength. The cohesion (c) demonstrates a quadratic relationship with . (4) The breakage index proves to be effective in quantifying particle breakage, with its relationships to top pressure and gravel strength being mathematically describable through planar equations. Notably, shows superior sensitivity to variations in both crushed stone strength and top pressure compared to conventional indices.
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2025, Vol. 44 
