大连理工大学学报2025，Vol.65Issue(3)：288-296,9.DOI:10.7511/dllgxb202503010
极高烈度地震区不同矢跨比曲线隧道地震响应分析
Seismic response analysis of curved tunnels with different rise-span ratios in extremely high intensity seismic area
摘要
Abstract
Based on the extremely high intensity of Paomashan tunnel and the complex plane alignment of its curve sections,the concept of rise-span ratio(α)is put forward to classify it,and the numerical model of curved tunnels with different rise-span ratios under earthquake action is established by numerical simulation method.The seismic response of curved tunnel in extremely high intensity seismic area is studied.The results show that:In comparison to straight tunnels,the curved tunnel exhibits distinct sectional variations in relative deformation under the earthquake action.The curved tunnel can be categorized into a growth section(0-300 m and 900-1 200 m)and a stable section(300-900 m)based on the rate of deformation expansion.Notably,the relative deformation in the growth section experiences a rapid increase and higher horizontal relative deformation in x direction(ΔUx).While that in the stable section remains nearly constant,albeit horizontal relative deformation in y direction(ΔUy)at a higher magnitude.The relative deformation rate and plastic strain of the curved tunnel in the growth section escalate with an increase in the rise-span ratio.Specifically,the maximum increase amplitudes in relative deformation rate and plastic strain are 14 times and 3 times,respectively.Furthermore,there is an increasing disparity in acceleration between the stable and growth sections.Analyzing the variation patterns of relative deformation,plastic strain and acceleration response for curved tunnels with different rise-span ratios,it is observed that the seismic response of curved tunnels with α=0.1,0.2 is closer to that of straight tunnels,while the seismic response of curved tunnels with α=0.3,0.4 is more curvilinear,necessitating consideration in seismic design.关键词
曲线隧道/极高烈度/矢跨比/地震响应/数值模拟Key words
curved tunnel/extremely high intensity/rise-span ratio/seismic response/numerical simulation分类
交通工程引用本文复制引用
张国军,王希宝,肖锋,罗庆斐,王峥峥..极高烈度地震区不同矢跨比曲线隧道地震响应分析[J].大连理工大学学报,2025,65(3):288-296,9.基金项目
国家自然科学基金资助项目(51778109) （51778109）
四川省交通运输科技项目(2019-ZL-12). （2019-ZL-12）
