双向地震作用下浅埋软土电力隧道的动力响应  

The seismic response analysis of power tunnel under soft soil subjected to bidirectional earthquake

作　　者：刘飞禹[1] 杨春花[1] 张斌[2] 

机构地区：[1]上海大学土木工程系,上海200072 [2]上海市电力公司,上海200122

出　　处：《四川建筑科学研究》2013年第5期144-149,共6页Sichuan Building Science

基　　金：国家自然科学基金资助项目(50808119);上海市电力公司科技项目

摘　　要：为了研究浅埋软土地下电力隧道结构在双向地震作用下的行为反应,采用大型岩土软件FLAC3D对浅埋软土地下电力隧道进行了数值模拟。建立了双向地震作用下软土电力电缆隧道的三维计算模型,考虑地下水位为地表以下1 m,计算了在水平和竖直地震荷载作用下,埋地电力隧道的动力响应,并对典型截面的典型点的速度、加速度、位移进行了监测。计算结果表明,在上海人工地震波作用下,电力隧道结构水平残余位移62.7 mm,竖向残余位移7 mm,隧道结构产生的永久变形为63 mm,隧道结构顶部和底部之间的水平相对位移52.1 mm,竖向相对位移几乎为0。地表水平残余变形16.4 mm,竖向残余变形7 mm。结构剪应力大小随着动荷载的增大而增大,而主应力随动荷载的输入而减小。数值分析结果表明,在软土地基下电力隧道产生剪切破坏的可能性较大,拉伸破坏和共振的概率较小。In order to study the seismic response of power tunnel shallow buried in soft soil subjected to the horizontal and vertical earthquake,the large-scale geotechnical software FLAC3D was adopted for the numerical calculation. A three-dimensional model was established,and the ground water table is I m underground. The speed, acceleration and displacement of typical points of typical sections are monitored in the entire process of earthquake. Responses of buried power tunnel were calculated under bidirectional earthquake. The results shows that under Shanghai artificial seismic wave, the residual horizontal displacement of the tunnel is 62. 7 mm, and vertical displacement is 7 mm, and the permanent deformation of the tunnel is 63 mm. The relative horizontal displacement of the roof and bottom of the tunnel is 52. 1 mm, but the relative vertical displacement of the roof and the bottom is nearly 0. The residual horizontal and vertical displacement of ground are 16.4 mm and 7 mm. The whole shear stress increases with the input of dynamic loads, while the principal stresses decrease with the input of dynamic loads. The natural frequency of tunnel is 6 Hz. In conclusion the probability of shear failure is large, and the probability of tensile and resonance of tunnel failure is small.

关 键 词：电力管线 数值模拟 地震响应 软土 

分 类 号：TU452.28[建筑科学—岩土工程]