摘要
露天矿山边坡顶部堆载的作用会显著降低边坡的稳定性,而依据不同失稳判据确定的安全系数则会直接影响堆载边坡稳定性状态的评价。通过建立顶部堆载作用下边坡的有限元模型,从3类不同的失稳判据,即数值计算不收敛判据、塑性区贯通判据以及特征点位移突变判据入手,对比分析了堆载大小分别为25,50,75 kPa时的边坡安全系数。结果表明:坡顶堆载越大,边坡的安全系数越小;采用不同的失稳判据得出的边坡安全系数大小有一定区别,其中由计算不收敛判据得出的安全系数偏大,由特征点位移突变判据得出的安全系数偏小。结合堆载边坡的特殊工况,在实际工程中建议优先选用较为保守的特征点位移突变判据对边坡稳定性进行分析,同时将其他判据结果作为补充参考,以准确评价堆载边坡的稳定性状态。
The effect of the heap load on the top of the open-pit mine slope will significantly reduce the stability of the slope,and the safety factor according to different instability criteria will directly affect the evaluation of the stability of the slope.By establishing the finite element model of the slope under the top load,starting from three different instability criterias,namely the numerical calculation non-convergence criterion,the plastic zone penetration criterion and the characteristic point displacement mutation criterion,the safety factors of the slope are compared and analyzed when the load is 25,50,75 kPa.The results show that the larger the heap load,the smaller the safety factor of the slope;the safety factors of the slopes obtained by using different instability criteria are somewhat different.Among them,the safety factor derived from thecriterion of calculation non-convergence is larger,and the safety factor derived from thecriterion of feature point displacement mutation is smaller.Considering the special working conditions of the heaped slope,it is recommended to choose the latter criterion to analyze the slope stability while referring to the results of other criteria,which can ensure more accurate results.
作者
王其宽
梁世春
宋晓雷
WANG Qikuan;LIANG Shichun;SONG Xiaolei(School of Engineering and Technology,China University of Geosciences(Beijing);Shanxi Transportation Planning Survey and Design Institute Co.,Ltd.)
出处
《现代矿业》
CAS
2021年第6期110-114,共5页
Modern Mining
基金
山西省交通运输厅科研项目(编号:2015-1-9,2018-1-30)。
关键词
顶部堆载
失稳判据
安全系数
有限元
稳定性分析
heap load on the top
instability criterion
the safety factor
finite element
stability analysis
