New Design Method and New Test Technology
doi:10.3850/978-981-07-0188-8_P181
Specimen Reconstitution and Uniaxial Compressive Strength Testing of Rock-Soil Mixtures
Yadong Xue1, Hongwei Huang1 and D. V. Griffiths2
1Geotechnical Engineering Department, Tongji University, Shanghai, 200092, China
2Division of Engineering, Colorado School of Mines, Address Golden, 80401, U.S.A
ABSTRACT
In the most mountainous areas of southwest China, the lands, and especially the slope base areas, are covered with colluvial deposits. These colluvial deposits consist of low strength materials like clay or sands and high strength materials like rocks. Such a mixture is an inhomogeneous geo-material with wholly different behavior to that of soil or rock alone. In the laboratory, some samples of this colluvium were reconstituted, and unconfined uniaxial compression tests were carried out on the specimens with volumetric rock content (VRC) varying in the range 0 < (VRC) < 60%. Typical stress-strain curves and relationships between uniaxial compressive strength (UCS) and rock content were analyzed. In addition, ultrasonic tests were carried out on the mixture specimens, and the relationship between wave velocity, rock content and the variation of wave velocity to the loading process were discussed. The results show that the uniaxial compressive strength and elastic modulus of colluvium show a similar linear relationship for specimens with different rock content. Compressive strength and elastic modulus of specimens with VRC of 20% ~ 30% were found to be the largest, and in the loading process, the wave velocity decreased with increase of vertical stress.
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