摘要
在泥岩遇水软化的理论基础上,设计了不同含水率泥岩试样的剪切试验,深入探讨了泥岩软化过程中力学指标黏聚力和内摩擦角的变化规律;结合缓顺倾边坡失稳机理分析,推导出了安全系数表达式,揭示了泥岩强度变化对整体边坡的影响规律。结果表明:随着含水率的变化对泥岩的黏聚力和内摩擦角呈现出类似的变化规律,但是有所区别;黏聚力在试样含水率达到30%及以上时,才表现出下降趋势;而摩擦角从含水率25%就表现出来较为明显的衰减;煤层顶板泥岩的强度变化对整体边坡的稳定性起着关键作用,因此将硬岩之上可弱化层称之为关键弱层。
Based on the theory of water softening of mudstone,we design shear experiments of mudstone samples with different water contents,and discuss the variation law of mechanical indexes cohesion and internal friction angle in the process of mudstone softening.Combined with the analysis of the instability mechanism of gentle slope,the article deduces expression of safety factor,and reveals the influence law of mudstone strength change on the whole slope.The results show that with the change of water content,the cohesion and internal friction angle of mudstone show a similar change rule,but there are some differences.The cohesion shows a downward trend when the water content of the sample reaches 30%or above.The friction angle from the water content of 25%has shown a significant attenuation.The strength change of mudstone on the roof of coal seam plays a key role in the stability of the whole slope,so the weakening layer above the hard rock is called the key weak layer.
作者
李保生
杨程烨
韩流
LI Baosheng;YANG Chengye;HAN Liu(China Railway Resources Sunite Left Banner Manglai Mining Co.,Ltd,Xilingol 011300,China;School of Mines,China University of Mining&Technology,Xuzhou 221116,China)
出处
《露天采矿技术》
CAS
2022年第1期5-8,共4页
Opencast Mining Technology
关键词
露天煤矿
泥岩弱化
顺倾边坡
边坡失稳
含水率
抗剪强度
open-pit coal mine
mudstone weakening
bedding slope
slope instability
moisture content
shear strength
