摘要
为了研究高地应力条件下节理岩体的卸荷松动效应,设计一套高地应力条件下节理岩体开挖卸荷松动的室内试验模拟系统,利用岩条受压后的快速断裂失稳,有效实现单轴受压节理岩体试件的应力快速卸载,模拟出高地应力瞬态卸荷引起的岩体松动效应,从而更好地论证高地应力条件下岩体开挖荷载瞬态卸荷(ELTU)引起的节理岩体的松动效应,并利用试验模拟的方法研究开挖荷载瞬态条件下节理岩体松动效应与初始地应力的相互关系。试验结果表明,地应力瞬态卸荷产生的节理面张开位移与卸荷初始应力的平方存在一定的正比关系,节理面的数量以及与开挖卸荷部位的距离影响各节理面处的张开位移在开挖卸荷总位移量中所占比例。
In order to study the loosening effect induced by rock mass excavation under high in-situ stress,a laboratory experimental simulation system was designed. By the rapid failure of a rock bar,the system is capable of simulating rapid unloading for jointed rock mass,thus is able to simulate the loosening effect of jointed rock mass under excavation load transient unloading(ELTU),by which,the relationship of in-situ stress level and structural plane opening displacement can be studied. Regression analysis results show that,the opening displacement value is in positive relationship with the square value of in-situ stress. The proportion of displacement on each joint in the total displacement induced by excavation load transient unloading is dependent on the amount and location of joints.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S1期2941-2947,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家杰出青年科学基金项目(51125037)
国家自然科学基金青年基金(51309183)
中国博士后科学基金面上项目(2014M552099)
关键词
岩石力学
开挖荷载
瞬态卸荷
岩体松动
节理岩体
模拟试验
rock mechanics
excavation load
transient unloading
rock mass loosening
jointed rock mass
simulation experiment
