摘要
为分析西部高寒高海拔地区某露天矿山设计边坡在冻融影响下的稳定性及变形破坏特征,本文参考设计情况选定了典型计算剖面,并基于岩石的冻融强度试验结果及常规力学计算结果,确定了岩体的计算力学参数;针对冻融对岩体边坡的影响,推断冻融层的分布规律,在此基础上结合地层信息确定数值计算的力学参数赋值;此后采用有限差分程序,定量分析了在自重、岩体开挖、爆破及地震荷载作用下边坡的力学响应特性,并结合强度折减算法,求解得到了对应的潜在滑动面形态及安全系数,结果显示研究边坡安全系数分别为:自重+地下水—1.465,自重+地下水+爆破振动—1.402,自重+地下水+地震—1.363,均满足现行规范要求。本研究成果为高寒地区冻融岩层的力学特性以及受冻融影响露天煤矿的边坡稳定性研究提供了参考。
In order to analyze the stability and deformation damage characteristics of the designed slope of an open-pit mine in the western alpine and high-altitude area under the influence of freezing and thawing,the article selects a typical computational profile with reference to the design situation,and determines the computational mechanical parameters of the rock body based on the results of the testing of the strength of rock body to freezing and thawing and the results of the conventional mechanical calculations.After that,the finite difference program was used to quantitatively analyze the mechanical response characteristics of slopes under self-weight,rock excava⁃tion,blasting and seismic loading,and combined with the strength reduction algorithm,the corresponding potential sliding surface morphology and safety coefficients were obtained,which showed that the safety coefficients of the studied slopes were as follows:self-weight+groundwater-1.465 The results show that the safety coefficients of the studied slopes are:self-weight+groundwater-1.465,self-weight+groundwater+blasting vibration-1.402,self-weight+groundwater+earthquake-1.363,which meet the requirements of the current specification.The results of this research provide a reference for the mechanical properties of freeze-thawed rock formations in alpine regions and the slope stability research of open pit coal mines affected by freeze-thaw.
作者
宋来臣
马海涛
于正兴
张亦海
SONG Laichen;MA Haitao;YU Zhengxing;ZHANG Yihai(Xizang Julong Copper Co.,Ltd.,Lhasa 850000,Xizang,China;China Academy of Safety Science and Technology,Beijing 100101,China;Cathay Safety Technology Co.,Ltd.,Beijing 102299,China)
出处
《矿产勘查》
2024年第S01期90-96,共7页
Mineral Exploration
基金
国家矿山安全监察局安全生产科研攻关项目(第一批)“大型矿山超高陡边坡透明化监测预警技术研究”
中国安全生产科学研究院基本科研业务费专项资金项目(2024JBKY20)联合资助。
关键词
边坡稳定性
冻融循环
强度折减法
安全系数
slope stability
freeze-thaw cycles
strength reduction method
factor of safety
