| 微风化岩体隧道开挖反分析及围岩稳定性评价 |
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| 作者单位： | ;1.山东科技大学山东省土木工程防灾减灾重点实验室;2.山东科技大学土木工程与建筑学院;3.青岛市勘察测绘研究院 |
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| 摘 要： | 青岛嘉定山地铁区间段多为微风化的花岗岩地层,地势起伏复杂。为探究本区间隧道在开挖过程中围岩的稳定性问题,采用最小安全系数法对围岩稳定性进行分析。由于地质条件复杂,岩体参数取值很难确定,基于D-P准则,采用ABAQUS建立3D弹塑性模型,根据黄金分割算法进行隧道断面拱脚位置的位移反演,确定本次计算中参数弹性模量E、泊松比μ;用修正后的岩体参数计算围岩的安全系数F_s,预判开挖围岩破坏区,为隧道围岩支护方案的设计提供依据。
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| 关 键 词： | 地铁隧道 弹塑性模型 位移反演 黄金分割算法 安全系数Fs 破坏区 |
Inversion Analysis of Tunnel Excavation and Surrounding Rock Stability in Weakly Weathered Rock Mass |
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| Institution: | ,Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology,College of Civil Engineering and Architecture, Shandong University of Science and Technology,Qingdao Institute of Survey and Geomatics |
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| Abstract: | The Jiadingshan Subway Section of Qingdao is dominated by weakly weathered granite stratum. In order to explore the stability of surrounding rock during the excavation process, the minimum safety factor method is employed. Due to the complex geological conditions, it is difficult to determine the parameters of rock mass. Based on D-P criterion, a 3 D elastic-plasticity model is established by ABAQUS. The displacement inversion of the tunnel arch is proceeded based on golden section algorithm and the parametric elasticity modulus E and μ are determined. The corrected rock mass parameters are used to calculate the safety factor F_s of the surrounding rock, and the surrounding rock failure zone is pre-determined to provide a basis for the design of the tunnel surrounding rock support scheme. |
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| Keywords: | metro tunnel elastic-plastic model displacement inversion golden section algorithm safety factor F_s failure zone |
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