摘要
以越岭公路岩质隧道为研究对象,构建隧道围岩与支护结构的安全系数。首先,基于围岩开挖后二次应力场的空间效应,确定隧道模型的边界条件、尺寸要求及应力条件。结合实际的隧道工程施工工艺,建立具备开挖支护功能的隧道三维数值模拟研究模型,以该模型作为研究隧道开挖与支护结构耦合分析的基础。基于数值模拟计算,分别构建围岩收敛曲线及纵向变形规律曲线。其次,建立隧道围岩与支护系统的收敛-约束图,并基于收敛-约束原理建立岩质隧道初衬安全系数求解方法。最后,通过案例分析,详细展示上述过程。结果表明该安全系数法可以量化表征围岩开挖与支护过程中的隧道安全性问题。同时,若以安全系数为量化分析指标,则能够对隧道施工工艺进行优化。
Taking the rock tunnel over mountains as the study object,the safety factor between the surrounding rock and the supporting structure of the tunnel was established.Firstly,the boundary conditions,dimensional requirements and stress conditions were studied based on the spatial effect of secondary stress after the excavation of surrounding rock.Combining with the actual construction technology of tunnel engineering,a three-dimensional numerical simulation model of tunnel with excavation and supporting function was built,which was the basis of coupling analysis of tunnel excavation and supporting structure.Secondly,the ground reaction curves and longitudinal deformation profiles of surrounding rock were also established respectively based on the numerical simulation analysis.Thirdly,the convergence-confinement diagrams between surrounding rock and supporting system were established,and the solving method of safety factor for primary lining of rock tunnel was also presented based on convergence-confinement principle.Finally,through case analysis,the above process was fully demonstrated.The results show that the safety factor method can quantitatively characterize the tunnel safety during excavation and support of surrounding rock.In addition,if the safety factor is used as the quantitative analysis index,the construction technology of tunnel can also be optimized.
作者
刘少峰
刘云
苏永华
LIU Shaofeng;LIU Yun;SU Yonghua(School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164,China;School of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《常州大学学报（自然科学版）》
CAS
2021年第1期85-92,共8页
Journal of Changzhou University：Natural Science Edition
基金
江苏省高校自然科学基金面上资助项目(18KJB560001)。
关键词
隧道工程
围岩
安全系数
收敛-约束原理
收敛曲线
tunnel engineering
surrounding rock
safety factor
convergence-confinement principle
ground reaction curve
