摘要
借助结构稳定理论中在均布荷载与集中力作用下的梁模型,建立了梯形荷载作用下的简支梁模型,并计算其挠曲线方程。将浅埋偏压隧道近似看成受梯形荷载作用下的简支梁,利用计算出的挠曲线方程计算出简支梁最大弯矩;由应力计算公式和强度条件,在弯曲应力不大于容许弯曲应力的条件下,可得到洞顶上覆岩体最小安全厚度。在浅埋偏压隧道开挖前,可通过最小安全厚度的计算判断设计的上覆岩体厚度是否符合安全要求,以避免工程事故的发生。
Based on the beam model under the action of uniform load and concentrated force in structure stability theory, a simply supported beam model under the action of trapezoidal load was established and its flexural equation was calculated. And shallow-buried bias tunnel was treated as simply supported beam under the action of trapezoidal load, the maximum bending moment of simply supported beam was computed by the calculated flexural equation. Under the condi- tion of the bending stress not beyond the allowable bending stress, the minimum safety thickness of overlying rock mass on hole crest was obtained on the basis of stress calculation formula and strength conditions. Before the shallow-buried bias tunnel excavation, it can be judged through the minimum safety thickness calculation whether the designed overlaying rock thickness meets the safety requirements or not, so as to avoid engineering accidents.
出处
《湖南工业大学学报》
2013年第1期24-27,共4页
Journal of Hunan University of Technology
基金
湖南省教育厅基金资助项目(12K103)
湖南省科技计划基金资助项目(2009SK3037)
关键词
浅埋偏压
梯形荷载
安全厚度
稳定理论
shallow-buried bias tunnel
trapezoidal load
safety thickness
stability theory
