层状岩体圆形巷道破坏特征及锚固支护对比试验研究

发布时间：2018-04-25 23:08

本文选题：层状岩体 + 圆形巷道　；参考：《煤矿安全》2017年05期

【摘要】：为获得层状岩体圆形巷道变形破坏特征及锚固效果,采用CM60/10平面应变试验台配合三轴伺服试验机,通过相似材料模拟技术,对初始埋深400 m的层状岩体圆形巷道模型逐级施加载荷,对比分析了高垂直应力(λ1)条件下无支护及锚网索喷支护圆形巷道围岩变形破坏特征。试验结果表明:无支护状态下巷道两帮围岩出现明显的"楔形"破坏区域,以巷道腰线为中心,两帮浅部围岩亦出现相向垂向移动,顶板出现"月牙状"块状冒落,底板出现明显鼓胀,巷道围岩整体变形破坏严重;加载后期,无支护状态下巷道顶板下沉量、底板底鼓量明显增大,而锚固支护在相同地应力作用条件下,顶板下沉量、底板底鼓量基本呈线性增长且增长速率较慢,有效控制了巷道围岩的变形破坏。
[Abstract]:In order to obtain the deformation and failure characteristics and anchoring effect of circular roadway in layered rock mass, the CM60/10 plane strain test bench and three-axis servo testing machine were adopted, and the similar material simulation technology was used. The deformation and failure characteristics of circular roadway without support and bolting wire mesh shotcrete support under high vertical stress (位 _ 1) are compared and analyzed by applying load to the circular roadway model of layered rock mass with initial depth of 400m. The test results show that there are obvious "wedge-shaped" damage areas in the surrounding rock of the two sides of the roadway without support. Taking the waist line of the roadway as the center, the shallow surrounding rock of the two groups also appears vertical movement in opposite direction, and the "crescent" block caving of the roof appears. At the later stage of loading, the amount of roadway roof subsidence and bottom floor heave increase obviously, while the anchor support under the same in-situ stress condition, the roof subsidence, the total deformation of the roadway surrounding rock is serious, the roof subsidence amount is obviously increased under the condition of the same in-situ stress in the late loading period, and the floor heave amount increases obviously under the condition of the same in-situ stress. The volume of floor heave increases linearly and the growth rate is slow, which effectively controls the deformation and failure of roadway surrounding rock.
【作者单位】：河北工程大学;河北省煤炭矿井建设工程技术研究中心;开滦东欢坨矿业分公司;
【基金】：河北省教育厅科学研究计划资助项目(QN2015069) 邯郸市科技局计划资助项目(1521109072-7)
【分类号】：TD353

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