首页|卸载状态下非均质圆形寒区隧道围岩弹塑性统一解

卸载状态下非均质圆形寒区隧道围岩弹塑性统一解

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以统一强度理论作为卸载状态下寒区隧道冻结围岩屈服准则，综合考虑围岩非均质特性和中间主应力效应对冻结围岩强度影响，建立寒区隧道应力位移弹塑性力学模型，联合各区域边界条件，计算获得冻结围岩均质与非均质状态下，弹性解、塑性统一解以及塑性区半径的隐式方程，分别对其应力位移场讨论分析。研究表明:考虑冻结围岩的非均质特性，塑性区环向应力峰值增大40%，塑性区范围相对减少40。4%，内壁位移减少9。3%，弹性极限承载力提高41%，塑性极限承载力提高14%，影响显著。中间主应力效应能充分发挥非均质冻结围岩承载潜能，计算得到的承载力明显增大，塑性半径明显减小。所得结果可为寒区隧道开挖支护设计以及数值模拟，提供理论指导。
Elastoplastic unified solutions of the non-homogeneous surrounding rock of circular tunnels in cold regions under unloading state
Taking the unified strength theory as the yield criterion of frozen surrounding rock of tunnels in cold regions under the unloading state,taking into account the influence of the non-homogeneous of surrounding rock and the intermediate principal stress effect on the strength of frozen surrounding rock,an elastic-plastic mechani-cal model of stress displacement of tunnels in cold regions is established,and combining with the boundary con-ditions of each region,the elastic solution,the plastic unified solution and the implicit equation of the radius of the plastic zone under the homogeneous and non-homogeneous state of frozen surrounding rock are calculated,discussion and analysis of stress and displacement fields respectively.The research shows that considering the heterogeneity of frozen surrounding rock,the peak value of hoop stress in plastic zone increases by 40%,the range of plastic zone decreases by 40.4%,the displacement of inner wall decreases by 9.3%,the elastic ulti-mate bearing capacity increases by 41%,and the plastic ultimate bearing capacity increases by 14%,which has a significant impact.The intermediate principal stress effect can give full play to the bearing potential of frozen surrounding rock,the calculated bearing capacity is significantly increased,and the plastic radius is significantly reduced.The results can provide theoretical guidance for tunnel excavation and support design and numerical simulation in cold regions.

tunnels in cold regionsnon-homogeneous frozen surrounding rockelastoplastic analysisinterme-diate principal stress effectunified strength theory

梁沈伟、王彬、荣传新、于胜民

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安徽理工大学 土木建筑学院,安徽 淮南 232001

中煤矿山建设集团有限责任公司 博士后科研工作站,安徽 合肥 230091

安徽理工大学 矿山地下工程教育部工程研究中心,安徽 淮南 232001

寒区隧道 非均质冻结围岩 弹塑性分析 中间主应力效应 统一强度理论

中国博士后基金面上项目安徽省自然科学基金项目安徽高校自然科学研究项目安徽省博士后基金项目矿山地下工程教育部工程研究中心开放基金资助项目安徽理工大学校级研究重点项目(自然科学类)安徽省科技重大专项

2021M7036212108085QE251KJ2021A04252022B635JYBGC-ZX2022103xjzd2020-018202003c08020007

2024

10.7522/j.issn.1000-0240.2024.0053

冰川冻土
中国地理学会 中国科学院寒区旱区环境与工程研究所

冰川冻土

CSTPCD
影响因子：2.546
ISSN：1000-0240
年,卷(期)：2024.46(2)
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