摘要
对锚注前软岩巷道围岩应力状态进行弹塑性分析,计算出锚注前围岩残余强度区半径;在此残余强度区内进行注浆,并将注浆区再细化为弹性区和塑性区,引入岩石蠕变的鲍尔丁-汤姆逊模型,建立了软岩巷道锚注支护结构的蠕变分析模型,采用塑性区岩体体积不变的假设,对锚注支护结构进行了黏弹性分析和黏塑性分析,推导出软岩巷道锚注支护结构应力及位移的蠕变公式.理论分析与相似模拟结果表明:软岩巷道锚注支护结构弹性区应力与时间无关,塑性区应力随时间而变化;弹性区、塑性区位移随时间的推移而不断增大,最后趋于一定值,且塑性区位移与半径成反比关系.
The radius of the residual strength zone was derived from an elastic-plastic analysis of the surrounding rock.The residual strength zone was grouted and divided into an elastic-and a plastic-zone.A creep model of a bolt-grouting support structure was developed from the Poynting-Thomson model and the hypothesis of constancy of volume.The formulations for displacement and stress in the creep model were derived by viscoelastic and viscoplastic analysis.Theoretical analysis and analogue simulations show that fo...
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2009年第5期607-612,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50874103)
江苏省自然科学基金项目(BK20081590)
国家重点基础研究发展计划(973)项目(2006CB202210)
江苏省青蓝工程项目
关键词
软岩巷道
锚注支护
蠕变
本构方程
力学模型
soft rock roadway
bolt-grouting support
creep
constitutive equation
mechanical model
