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考虑劣化效应与支护时机的深埋软岩隧道变形分析

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深埋软岩隧道的围岩变形与其自身参数劣化、流变特性及支护结构施作时机等密切相关.借助建立的深埋软岩圆形隧道复合式衬砌力学模型,在考虑塑性区围岩强度参数(黏聚力、内摩擦角)和刚度参数(弹性模量)的劣化效应后,基于统一强度准则得到了复合式衬砌支护结构各个支护阶段的围岩黏弹塑性解析式.研究结果表明:适当考虑中间主应力及围岩强度参数、刚度参数的劣化效应后,得到的变形量与深埋软岩隧道围岩的实际变形量吻合效果更好;残余黏聚力、残余内摩擦角、残余弹性模量对围岩瞬时变形、后期蠕变变形、二次衬砌支护抗力影响均较大,而且取值越小时围岩变形量与所需二次衬砌支护抗力越大;增加锚杆长度、缩小锚杆间距、增大初支厚度能有效控制围岩瞬时变形和后期蠕变变形;二次衬砌的施作时机对围岩后期蠕变变形影响较大,围岩瞬时变形结束后尽快施作二次衬砌可以有效控制围岩后期蠕变变形.
Deformation Analysis of Deep Soft Rock Tunnel Considering Deterioration Effect and Supporting Time
The surrounding rock deformation of the deep-buried soft rock tunnel was closely related to its parameter deterioration,rheological characteristics,and the timing of the supporting structure.The viscoelastic-plastic analytical formula of the surrounding rock in each support stage of the composite lining support structure was obtained based on the unified strength criterion using the mechanical model for the composite lining of the deep soft rock circular tunnel.This process was done while taking into account the deterioration of the strength parameters(cohesion,internal friction angle)and stiffness parameters(elastic modulus)of the surrounding rock in the plastic zone.Results indicate that the deformation obtained by properly considering the intermediate principal stress and the degradation effects of parameters of the surrounding rock is in better agreement with deep soft rock tunnel deformation.The residual cohesion,residual internal friction angle,and residual elastic modulus of the surrounding rock significantly affect the instantaneous and late creep deformation of the surrounding rock and the resistance of the secondary lining,where a lower value indicates more significant deformation.Furthermore,increasing bolt length,decreasing bolt spacing,and increasing initial support thickness can effectively control the instantaneous deformation and late creep deformation of the surrounding rock.The application time of the secondary lining significantly influences the late creep deformation of the surrounding rock.The late creep deformation of the surrounding rock can be effectively controlled by applying a secondary lining as soon as possible after the instantaneous deformation of the surrounding rock.

deep-buried soft rockcircular tunneldeterioration effectcomposite liningsupporting timeviscoelastic-plasticuniform strength criterion

王俊杰、张帅、张海龙

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重庆交通大学材料科学与工程学院,重庆 400074

重庆交通大学土木工程学院,重庆 400074

重庆文理学院土木工程学院,重庆 402160

深埋软岩 圆形隧道 劣化效应 复合式衬砌 支护时机 黏弹塑性 统一强度准则

国家自然科学基金面上项目重庆市建设科技计划项目重庆市自然科学基金创新发展联合基金(市教委)重点项目中铁二十一局集团有限公司科研项目

52378327城科字2022第8-12号2022NSCQ-LZX004923C-10

2024

10.16058/j.issn.1005-0930.2024.01.018

应用基础与工程科学学报
中国自然资源学会

应用基础与工程科学学报

CSTPCD北大核心
影响因子：0.895
ISSN：1005-0930
年,卷(期)：2024.32(1)
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