摘要
为探究深部高应力巷道的稳定性和分区变形特性,基于摩尔-库伦准则和关联性流动法则,建立了考虑应变软化塑性区的弹塑性力学模型。通过推导围岩破碎区和塑性软化区应力和位移解析解,揭示了不同围岩参数及支护阻力对深部巷道围岩各分区形态的影响规律。结果表明:当围岩强度参数降低时,应力峰值由37.07 MPa降至32.88 MPa,破裂区与塑性软化区破坏范围分别由3.93、4.21 m增加至6.5、8.06 m;当支护阻力增加时,应力峰值由32.76 MPa略微升高至33.35 MPa,破裂区与塑性软化区破坏范围分别由7.05、8.83 m缩小至4.82、5.99 m;当围岩劣化时,破碎区和塑性软化区破坏范围及巷道围岩变形程度越剧烈,而支护阻力增强可在一定范围内有效控制破裂区和塑性软化区破坏范围及围岩变形程度。
This paper is aimed at further exploring the stability and zoning deformation characteristics of deep high stress tunnels.Based on Mohr Coulomb criterion and the correlated flow rule,the study works by establishing an elastic-plastic mechanical model considering the strain softening plastic zone,and revealing the influence law of different surrounding rock parameters and support resistance on the shape of each zone of the surrounding rock in deep tunnels by deducing the analytical solutions of stress and displacement in the fractured zone and plastic softening zone of the surrounding rock.The results show that with the decrease of the strength parameters of the surrounding rock,the peak stress decreases from 37.07 MPa to 32.88 MPa,and the failure range of the fracture zone and plastic softening zone increases from 3.93 and 4.21 m to 6.5 and 8.06 m,respectively.When the support resistance increases,the peak stress slightly increases from 32.76 MPa to 33.35 MPa,and the failure range of the fracture zone and plastic softening zone decreases from 7.05 and 8.83 m to 4.82 and 5.99 m,respectively.When the surrounding rock deteriorates the more severe the radius failure range of the fracture zone and plastic softening zone,as well as the deformation degree of the tunnel surrounding rock.The enhancement of support resistance can effectively control the failure range and deformation degree of the fracture zone and plastic softening zone within a certain range.
作者
刘永立
高明星
祝永涛
林湎
Liu Yongli;Gao Mingxing;Zhu Yongtao;Lin Mian(School of Mining Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China;School of Safety Engineering,Heilongjiang University of Science&Technology,Harbin150022,China;Heilongjiang Longmei Shuangyashan Mining Co.Ltd.,Shuangyashan 155100,China)
出处
《黑龙江科技大学学报》
CAS
2024年第4期493-501,共9页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省“揭榜挂帅”科技攻关项目(2021ZXJ02A03)
黑龙江省“百千万”工程科技重大专项项目(2020ZX04A01)。
关键词
破碎区
塑性软化区
应力分布
支护阻力
crushing zone
plastic softening zone
stress distribution
supporting force
作者简介
第一作者:刘永立(1968-),男,黑龙江省哈尔滨人,教授,博士,研究方向:矿山安全与应急救援,E-mail:yongliliu1968@126.com。
