摘要
西藏墨竹知不拉铜矿处于高原地区,干旱高寒的气候以及恶劣的自然环境对矿区排土场边坡的稳定性存在不利影响。首先基于室内热物理试验结果,以测温法确定不同条件下碎石土的冻结温度,此后开展岩石冻融强度试验确定冻融次数对岩土体强度的影响,最后采用Bishop法对知不拉铜矿排土场边坡剖面进行稳定性分析。研究结果表明:碎石土的冻结温度随含水率的增加而增加;冻融循环次数对灰岩强度的影响程度最大,对矽卡岩最小;在自重、地下水、冻融循环的综合作用下,该排土场的边坡稳定性符合规范要求。
The chibula copper mine in Mozhu,Tibet,is located in a plateau area,where the arid and alpine climate and the harsh natural environment have a negative impact on the stability of the slopes of the mine drainage site.Based on the results of indoor thermophysical tests,the article firstly determines the freezing temperature of the gravel soil under different conditions by thermometry.Thereafter,rock freeze-thaw strength tests were carried out to determine the effect of the number of freeze-thaws on the strength of the geotechnical body.Finally,the Bishop method was used to analyse the stability of the slope profile of the Zhibula copper mine drainage site.The results show that the freezing temperature of the gravel soil increases with increasing water content;the number of freeze-thaw cycles has the greatest effect on the strength of the chert and the least on the silica;and the slope stability of the drainage site meets the code requirements under the combined effect of self-weight,groundwater and freeze-thaw cycles.
作者
林毅斌
LIN Yibin(Tibet Dragon Copper Industry Co.,Ltd.,Lhasa Tibet 850000,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2022年第S01期61-66,共6页
Journal of Safety Science and Technology
