深部软弱煤巷预应力锚杆支护效果分析  

Analysis of Supporting Effect of Prestressed Bolt in Deep Weak Coal Roadway

作　　者：徐盼 XU Pan(School of Architecture and Engineering,Tongling University,Tongling 244000,China)

机构地区：[1]铜陵学院建筑工程学院,安徽铜陵244000

出　　处：《宿州学院学报》2020年第8期68-71,共4页Journal of Suzhou University

基　　金：铜陵学院科研项目(2019tlxy67)。

摘　　要：结合工程实际,利用FLAC3D软件,选取应变软化模型,分析了围岩塑性区分布、形变量、位移梯度及压力拱随不同锚杆预紧力的变化。结果表明:塑性区面积与锚杆预紧力呈负指数关系;增大锚杆预紧力可以一定程度上减小围岩形变量,使帮部竖直应力峰值及压力拱内外边界向巷道方向移动,改善巷道浅部围岩应力状态,提高浅部围岩完整性及稳定性。Combined with engineering practice,using FLAC3D and selecting strain softening model,the variation of plastic zone distribution,shape variables,displacement gradient and pressure arch with different anchor bolt preload is analyzed.The results show that the relation between plastic zone area and anchor preload presents negative exponential.Increasing bolt prestress can reduce the surrounding rock shape variables to a certain extent which makes the vertical stress peak and the boundary of the pressure arch move towards the direction of the roadway,improves the stress state of the surrounding rock in the shallow part of the roadway,and improves the integrity and stability of the surrounding rock in the shallow part.

关 键 词：应变软化模型 锚杆预紧力 位移梯度 压力拱 

分 类 号：TD353[矿业工程—矿井建设]