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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第5期    总第61期    2014年10月

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文章编号:1672-7029(2014)05-0096-04
浅埋隧道塌方机理上限分析
严若明1,周光裕2,唐金2,杨小礼1

(1.中南大学 土木工程学院,湖南 长沙 410075;2.湖南路桥建设集团公司,湖南 长沙 410004)

摘 要: 对浅埋圆形隧道的塌方机制的预测是一项极为复杂的工作。基于Hoek-Brown破坏准则下,运用极限分析原理,对浅埋圆形隧道的破坏机制进行分析。在考虑支护力和孔隙水压力的前提下,对岩体内部进行能量耗散计算分析。推导出塌落面目标方程的参数表达形式。代入不同的参数值,绘制出具体的塌落面形状。分析讨论各参数对潜在的塌落形式的影响。研究结果表明:孔隙水压力系数ru和参数B增大,塌方范围减小;参数A和σt增大,塌方范围增大。

 

关键字: 浅埋隧道;破坏机理;极限分析;Hoek-Brown准则

Upper bound limit analysis of collapse mechanisms of the shallow tunnel
YAN Ruoming1, ZHOU Guangyu2, TANG Jin2, YANG Xiaoli1

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Hunan Road and Bridge Construction Group Corporation, Changsha 410004, China

Abstract:The prediction of the collapse mechanism in shallow circular tunnel is one of the most difficult tasks. Based on Hoek-Brown failure criterion and within the framework of upper bound theorem, the collapse mechanism of shallow circular tunnel was discussed in this paper. With the consideration of supporting pressure and pore water pressure, the energy dissipation of internal rock was calculated and analyzed, and the parameter expression of the objective function of collapse surface was derived. Thereafter, the specific shape of collapse surface was plotted with different parameter values, and parametric study was conducted to estimate the effect of every parameter on the potential collapse mechanism. The results indicate that, with the increase of pore water pressure coefficient ru and parameter B, the scope of collapsing block decreases. However, with the increasing magnitude of parameters A and σt, the range of detaching block tend to increase.

 

Key words: shallow tunnel; failure mechanism; limit analysis; Hoek-Brown criterion

ISSN 1672-7029
CN 43-1423/U

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