FENG Wenkai, ZHOU Qiang, BAI Huilin, CHEN Zhichao, QI Hao, ZENG Xiushu. 2018: EFFECT OF RAINFALL TO THE STABILITY OF ICE WATER ACCUMULATION OF THE HUANXIPO. JOURNAL OF ENGINEERING GEOLOGY, 26(3): 655-662. DOI: 10.13544/j.cnki.jeg.2017-133
    Citation: FENG Wenkai, ZHOU Qiang, BAI Huilin, CHEN Zhichao, QI Hao, ZENG Xiushu. 2018: EFFECT OF RAINFALL TO THE STABILITY OF ICE WATER ACCUMULATION OF THE HUANXIPO. JOURNAL OF ENGINEERING GEOLOGY, 26(3): 655-662. DOI: 10.13544/j.cnki.jeg.2017-133

    EFFECT OF RAINFALL TO THE STABILITY OF ICE WATER ACCUMULATION OF THE HUANXIPO

    • This paper studies the influence of rainfall on the slope stability of the ice accumulation in the upper reaches of Minjiang River.It takes the Huanxipo as an example.Based on the field rainfall simulation tests, a series of tests including permeability, water content and shear strength are carried out.The coupling of SEEP/W module and SLOPE/W module are used to analyze the influence of rainfall intensity and rainfall duration on the slope stability of this type of ice water accumulation.Research results show the follows.(1)The content of clay minerals in the ice accumulation body is up to 50%, and the content can reach more than 85% after saturation.The breccia soil has the characteristics of porosity development and poor gradation.The double loop permeability test is in good agreement with the experimental results.The permeability coefficient of the breccia is determined comprehensively as 1.315×10-3cm·s-1, belongs to medium to weak permeable matrix.(2)In the natural state, the shear strength of the breccia soil is higher.Water content has obvious effect on shear strength.From natural to saturation, the decay rate of cohesion c is obviously higher than that of internal friction angle φ.The cohesion c can be reduced 64.4%, while the internal friction angle is only decreased by 22.5%.(3)Under certain rainfall intensity, the slope stability coefficient decreases with the increase of rainfall duration.When the duration of rainfall is the same, the greater the rainfall intensity, the greater the slope stability decreases, but the stability of the steep declines in the timing of the inflection point in advance.
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