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Wang X.-Q.,Wuhan University of Technology | Xie N.,Wuhan University of Technology | Zou W.-L.,Wuhan University | Zou W.-L.,Hubei Key Laboratory of Security of Geotechnical and Structural Engineering | And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

Two artificial rainfall stimulation trials were conducted at a slope of subgrade filled with loess in Gansu Province and a slope of subgrade filled with soil containing stone in Chongqing City, China, respectively. The test results indicated that as each spell of rainfall go on, the ratio of infiltration of rainwater for slope of unsaturated subgrade decrease gradually owing to the increasing of water content of slope soil, namely, the decreasing of capacity of moisture-absorbing of which. It seemed there was a corresponding critical rainfall for unsaturated loess subgrade being in a original water content, only if practical rainfall exceed the critical rainfall, runoff probably occur, and the greater the rainfall density, the shorter the period from beginning of rainfall to occurring of runoff. The matrix suction of slope of subgrade filled with loess far exceed that of slope of subgrade filled with soil containing stone. The permeability of compacted loess was very small. For the slope of subgrade filled with soil containing weathering shale and mudstone with fracture, which provided the passageway for the infiltration of rainfall, the influence depths of rainfall infiltration far exceeded those of the slope of subgrade filled with loess, and under this field trial circumstance, the influence depths of rainfall infiltration for the former were 0.3~0.6 m, but those for the latter exceeded 2.4 m. Source


Zou W.-L.,Wuhan University | Zou W.-L.,Hubei Key Laboratory of Security of Geotechnical and Structural Engineering | Xie P.,Wuhan University | Ma Q.-T.,Wuhan University | And 2 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2011

The physical properties, swelling-shrinkage characteristics and shear strength of an expansive soil modified with waste tire rubber particles were studied. The expansive soil used was obtained from Jingzhou, Hubei Province, China. The test results showed that when the mass fractions of rubber particles was under 23%, the liquid limit and plastic index of the modified expansive soil increased with the increment of mass fractions of rubber particles, while the plastic limit had little change. Compared with the unmodified expansive soil, the maximum dry density of the modified expansive soil decreased and the optimum water content was almost unchanged, the cohesion and the shear strength of the modified expansive soil decreased clearly, but the shear strength and the internal friction angle of the modified expansive soil had little change with the increment of mass fractions of rubber particle. The swelling-shrinkage characteristics of the modified soil were significantly weakened. Moreover, the best modified effect was obtained under a mass fraction of waste tire rubber particles of 23%. Source

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