摘要
为考察大断面切眼掘进过程中不同施工顺序所引起的工程响应的差异,对两种常用方式进行了数值计算.通过对所得数据结果的分析处理得到:在巷道开挖中,围岩应力分布呈"蝴蝶"形分布,在左右两边向左上角、右上角两个方向演化扩展,为可能冲击中心区;分别选取切眼左右两侧和顶板37个点,得到其随不同掘进方式的应力变化规律,并以此分析了两帮冲击和顶板冲击的危险性,发现"先导硐再刷大"方案中右侧最易冲击;定义了广义应变能密度概念,并依据开掘过程中广义应变能密度的变化和冲击的相关性,初步提出针对特定工程的简易冲击准则.
In order to study the differences of engineering behavior in large section open-off cut in different construction orders,the mining process of two common orders was simulated by using the software ANSYS.The result data through relevant analysis shows that the stress distribution of surrounding rock presents the shape of butterflies,and it expands toward top left corner and top right corner,which is the possible bumping center.37 points were selected respectively on two sides of the open-off cut and rock roof,and the change law of equivalent stress at those points in different construction orders was obtained.On the basis of this,the bumping risk of two-sides and rock roof was analyzed,showing that the bumping risk is the worst on right hand of open-off cut in project ＂first-lead-then-larger＂.Generalized strain energy density was brought forward and defined,and a simple bumping rule used in given engineering was set up based on the relationship between the change of generalized strain energy density and bumping risk in cutting process.
出处
《采矿与安全工程学报》
EI
北大核心
2010年第2期264-268,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226804)
关键词
大断面切眼
施工顺序
冲击危险
采动应力
广义应变能密度
large section set-off room
construction order
bumping risk
mining stress
generalized strain energy density
