文章摘要
极高烈度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-to-span ratio in extremely high intensity zone
投稿时间:2024-01-11  修订日期:2024-02-07
DOI:
中文关键词: 曲线隧道  极高烈度  矢跨比  地震响应  数值模拟
英文关键词: curved tunnel  extremely high intensity  rise-to-span  seismic response  numerical simulation
基金项目:国家自然科学基金项目(51778109);四川省交通科技项目(2019-ZL-12)
作者单位
张国军 大连理工大学建设工程学院 
王希宝  
肖锋 四川雅康高速公路有限责任公司 
罗庆斐* 大连理工大学建设工程学院 
王峥峥 大连理工大学建设工程学院 
摘要点击次数: 11
全文下载次数: 0
中文摘要:
      依托跑马山隧道极高烈度以及其曲线段平面线型复杂的特点,提出矢跨比的概念对其进行分类,并采用数值模拟的方法建立不同矢跨比曲线隧道在地震作用下的数值模型,研究曲线隧道在极高烈度地震区的地震响应。结果表明:(1)与直线隧道相比,曲线隧道在地震作用下其相对变形具有明显的区段性,按照其增长的快慢,可以将其分为增长段(0~300m、900~1200m)和平稳段(300~900m)。其中增长段的相对变形增长快,且 较大,而平稳段相对变形几乎不变,但是 较大;(2)曲线隧道在增长段的相对变形率和塑性应变随着矢跨比的增大而增大,其中相对变形速率、塑性应变的最大增长幅度分别达到14倍、3倍。此外,平稳段与增长段的加速度差值也在增大;(3)综合考虑不同矢跨比曲线隧道相对变形、塑性应变以及加速度响应的变化规律,α=0.1~0.2的曲线隧道的地震响应与直线隧道更为接近,而α=0.3~0.4的曲线隧道的地震响应则更有曲线的特性,因此在进行抗震设计中需要重点考虑。
英文摘要:
      Based on the extremely high intensity of Paomashan tunnel and the complex plane shape of its curve section, the concept of rise-span ratio is put forward to classify it, and the numerical model of curved tunnel with different rise-span ratio under earthquake load is established by numerical simulation method. The seismic response of curved tunnel in extremely high intensity seismic area is studied. The results show that: (1) In comparison to straight tunnels, the curved tunnel exhibits distinct sectional variations in relative deformation during the earthquake. The curved tunnel can be categorized into a growth section (0~300m and 900~1200m) and a stable section (300~900m) based on the rate of deformation expansion. Notably, the relative deformation in the growth section experiences a rapid and substantial increase, and higher . While that in the stable section remains nearly constant, albeit at a higher magnitude. (2) 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 in relative deformation rate and plastic strain is 14 times and 3 times, respectively. Furthermore, there is an increasing disparity in acceleration between the stable and growing sections. (3) 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 = 0.3~0.4 exhibit a more pronounced curvilinear seismic response, necessitating consideration in seismic design.
View Fulltext   查看/发表评论  下载PDF阅读器
关闭