| 地下圆形隧道开挖卸荷围岩弹塑性分析 |
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| 引用本文： | 王新波,潘晓明.地下圆形隧道开挖卸荷围岩弹塑性分析[J].河南科学,2010,28(9):1153-1156. |
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| 作者姓名： | 王新波 潘晓明 |
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| 作者单位： | 1. 同济大学,岩土及地下工程教育部,重点实验室,上海,200092;核工业井巷建设公司,浙江,湖州,313000
2. 同济大学,岩土及地下工程教育部,重点实验室,上海,200092 |
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| 基金项目： | 中国博士后科学基金项目 |
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| 摘 要： | 针对地下圆形隧道,在分析开挖卸荷的基础上,分别给出了弹性和弹塑性围岩二次应力的计算表达式.在弹性不同侧压力条件下,分析了围压切向应力分布规律,当λ0.33时,圆形隧洞围岩将不出现拉应力.当围岩处于弹塑性状态时,考虑围岩稳定的前提下,扩大塑性区半径R,就可降低维持极限平衡状态所需的支护抗力pi,充分发挥了围岩的自承作用.
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| 关 键 词： | 围岩 二次应力 弹塑性分析 支护压力 |
Elastic-Plastic Analysis of Underground Circular Tunnel under Rock Excavation Unloading |
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| Wang Xinbo,Pan Xiaoming.Elastic-Plastic Analysis of Underground Circular Tunnel under Rock Excavation Unloading[J].Henan Science,2010,28(9):1153-1156. |
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| Authors: | Wang Xinbo Pan Xiaoming |
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| Institution: | 1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;2.Nuclear Industrial Well and Tunnel Construction Company,Huzhou 313000,Zhejiang China) |
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| Abstract: | On the basis of analysis of excavation unloading,this paper proposes the secondary stresses expression of surrounding rock in elastic state and elastoplastic state for the underground circular tunnel.Under elastic different conditions of lateral pressure,distribution of the tangential stress is analyzed,when the surrounding rock will not appear circular tensile stress in the surrounding rock.As λ0.33,the surrounding rock will not appear circular tensile stress.When the rock in the plastic state,considering the stability of the surrounding rock,if plastic zoneradius R is enla rging,then the support resistance pi which keep the state of limit equilibrium can be lessen.In this way,the self-supporting of surrounding rock can be brought into full paly. |
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| Keywords: | surrounding rock secondary stresses elastoplastic analysis support pressure |
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