摘要
对于多线、交叠式地铁隧道的研究目前主要集中在施工可行性及施工过程中的变形控制问题,而交叠隧道地铁运行引起的环境振动问题研究成果较少。针对地铁四孔交叠隧道的结构特征,以武汉地铁2号线、4号线某区段为背景,建立四孔交叠隧道ANSYS有限元模型,开展了不同列车组合对地面、地下环境的振动影响分析。分析结果表明:地面、地下测点振动强度主要受振源埋深以及距隧道中心水平距离(振源距)的影响,且均以竖向振动为主;地面测点振源距越大,振动越小,在一定距离内振动衰减明显,而后衰减缓慢;相同振源距位置的地下测点振动强度会出现比地面测点更大的情况;同一深度的地下测点,振源距越小,振动强度越大;当达到一定深度后,随着振源距的增大,振动变化幅度减小。多列列车同时运行时的地面测点的振动特性较单列列车运行时有一定的相似性,但更为复杂,需进一步研究。
The research about subway four-holes overlapping multi-tunnels is mainly concentrated in construction feasibility and deformation control problems occurred in the process of construction,but environmental vibration caused by subway four-holes overlapping tunnels is lack of related research. According to the structure characteristic of subway four-holes overlapping multitunnels,a certain interval of Wuhan metro line 2 and line 4 was selected to establish the finite element model by ANSYS and the vibration influences on the surrounding environment under different combination of train running were studied. The results show that the vibration intensity of measure points are mainly affected by depth of vibrating source and horizontal distance from vibrating source,the vibration are mainly in vertical direction. For ground vibration,the larger distance from vibration source,the smaller intensity of vibration,and within a certain distance vibration damping is clear,and then slowly decreases. The vibration intensity of the measure points which underground may be more apparent than those on the ground when in the same horizontal position. For the same depth of underground station,the smaller distance from vibration source,the greater intensity of vibration. The situation of two or more trainsrunning in the multi-tunnels at the same time is more complex than one train running,which needs further study.
出处
《南昌航空大学学报（自然科学版）》
CAS
2016年第1期86-91,共6页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
江西省教育厅青年基金(GJJ12445)
南昌航空大学博士科研启动基金(EA201111188)
关键词
四孔交叠隧道
地铁
环境振动
four-holes overlapping multi-tunnels
subway
vibration
