摘要
接触带巷道围岩剪应力大小及其分布特征是影响巷道安全稳定的关键因素之一,揭示不同接触角的巷道围岩剪应力变化规律是接触带巷道稳定性研究的重要内容。利用三维光弹应力冻结试验,根据光弹材料性质,采用3000kN的荷载对光弹模型加载,定量表征15°、30°、45°、60°和75°接触角的巷道围岩的剪应力分布状况。以铁矿和石灰岩接触带为工程背景,进行试验研究,结果表明,接触角越大剪应力集中位置越靠近顶底板中央;当接触角在15°~75°范围内变化时,随着接触角的增大巷道顶底部的剪应力总体变化趋势是先减小后增大,在接触角为30°时取到最小值。研究得到的不同接触角巷道围岩应力分布规律对接触带巷道的稳定性控制具有指导意义。
The value and distribution characteristics of shear stress of surrounding rock in contact roadway are one of the key factors affecting the safety and stability of roadway.It is important to study the variation of surrounding rock shear stress of roadway with different contact angles.According to the properties of photoelastic materials,using the three-dimensional photoelastic stress freezing test,the 3000kN load is applied to the photoelastic model to quantitatively characterize the shear stress distribution of surrounding rocks with the contact angles of 15°,30°,45°,60°and 75°.Taking the iron ore and limestone contact zone as engineering background,the test shows that the contact angle is larger,the closer the shear stress concentration is to the center of the roadway roof and floor;when the contact angle varies in the range of 15°—75°,the shear stress at the top and bottom of the roadway decreases first then increases,and reaches the minimum when the contact angle is 30°.The study of the stress distribution law of surrounding rock in different contact angle roadway has guiding significance for the stability control of engineering roadway.
作者
胡盛栋
叶义成
胡南燕
陈虎
李鹏程
罗斌玉
HU Shengdong;YE Yicheng;HU Nanyan;CHEN Hu;LI Pengcheng;LUO Binyu(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan,430081,China;Industrial Safety Engineering and Technology Research Center of Hubei Pr vince,Wuhan,430081,China;Three Gorges Geotechnical Consultants Co.,Ltd.,Wuhan,430074,China)
出处
《有色金属工程》
CAS
北大核心
2019年第11期101-107,共7页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51574183,51704213)~~
关键词
接触带巷道
接触角
围岩剪应力
三维光弹试验
contact zone roadway
contact angle
shear stress of surrounding rock
three dimensional photoelastic test
