摘要
采用二维快速拉格朗日程序FLAC,对回采巷道锚杆支护(端锚和全锚)进行地震动载模拟分析,得出锚杆轴力随动载作用时间的变化规律,同时发现锚杆安装角对轴力的动载响应有很大影响。在给定的模拟条件下,锚杆一般不会因为地震动载而失效,但锚杆需保留有一定的抗拉强度潜能。端锚和全锚对动载的响应不同,端锚支护巷道受动载的破坏较全锚小,表明动载巷道锚杆支护应采用端锚(或加长端锚)方式。
The rock bolts in mining roadways are always subjected to dynamic loading,such as blasting,rock burst and seismic loading. There has been little research into the response of rock bolts to dynamic loading. In this paper,a 2D fast Lagrangian analysis of continua (FLAC) code is used to analyze the influence of seismic loading on bolts (end-anchored and fully grouted). With the numerical analysis,the variation of axial force of bolt with dynamic loading time is obtained. The installation angle of bolts affects the dynamic response of axial force. The max dynamic stress in the bolts induced by seismic loading should be below the yield strength of bolt shank (steel). End-anchored bolts are of more ductibility and can be well suited to dynamic loading than fully grouted bolts. As a result,end-anchored bolt should be used in mining roadways to undergo dynamic loading.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第11期1903-1906,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
山西省青年科技基金(20021021)资助项目。
关键词
巷道工程
动载响应
锚杆支护
数值分析
回采巷道
roadway engineering,dynamic response,rock bolt supporting,numerical analysis
