LI Yage, ZHANG Li. Stability analysis of gangue field slope based on effective rainfall[J]. CHINA MINING MAGAZINE, 2021, 30(9): 67-72. DOI: 10.12075/j.issn.1004-4051.2021.09.006
    Citation: LI Yage, ZHANG Li. Stability analysis of gangue field slope based on effective rainfall[J]. CHINA MINING MAGAZINE, 2021, 30(9): 67-72. DOI: 10.12075/j.issn.1004-4051.2021.09.006

    Stability analysis of gangue field slope based on effective rainfall

    • Rainfall plays an important role in the slope stability of the gangue field.The analysis of the change of material physical and mechanical properties of gangue field slope during rainfall infiltration can let us calculate the degree of influence of rainfall on the stability of the gangue field more accurately.This paper analyzes the rainfall infiltration process of the gangue field and determined the calculation method of rainfall infiltration of the slope based on the advance distance of the wetting peak.Considering the time effect and cumulative effect of rainfall infiltration, proposes the estimation method to determine the rain intensity of slope under continuous rainfall by using effective rainfall.This paper compares the calculation parameters of Bishop’s equation and Vanapalli’s equation and determines the calculation method of the strength of gangue materials under the action of rainfall.Based on the theory, the stability of Wangjialing gangue field slope under rainfall is analyzed.The calculation results show that with the increase of rainfall, the wetting peak of gangue gradually deepens and the matrix suction of the material gradually decreases from top to bottom.The stability coefficient of the slope is also decreasing with the increase of rainfall, and the decreasing speed will be accelerated when the rainfall is more than 90 mm/d.Combining with the precipitation data of the gangue field in recent 10 years, the stability coefficient of slope under the maximum effective rainfall is calculated as 1.2.The results show that the slope of this gangue field is stable, and the existing rainfall conditions will not lead to slope destabilization and destruction.
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