为研究因工程场地高程差造成的折线型预制式管廊的地震稳定性问题，以西安纬一路段预制式地下管廊工程为例，使用ABAQUS软件对直线型和折线型管廊进行三维有限元动力计算，对比分析不同线型管廊在地震荷载作用下管廊结构的变形和加速度、拼接缝的变形、锚栓结构的受力及损伤特性的响应规律。研究发现： 1）折线管廊在x轴（横向）、z轴（纵向）的最大水平位移分别在管廊埋深变化段靠近浅埋处和管廊埋深变化段靠近深埋处管廊底板附近，表明了管廊结构高程变化点为变形敏感点； 2）折线管廊拼接缝在地震中和地震后的张拉变形很小，而横向和竖向滑移变形较大，其中横向水平滑移变形最大； 3）折线段管廊的损伤值比直线段管廊混凝土管节的损伤值更大，且折线管廊损伤主要发生在倾斜段的管节，其中多以拉伸损伤为主。在实际设计工作中，应提高折线管廊区域的管廊强度。
The problem of seismic stability of prefabricated
utility tunnels can be caused by elevation differences in engineering sites.
Hence, the software ABAQUS is used to develop a threedimensional
finite element dynamic model to calculate straightline
and brokenline utility tunnels. The seismic response
of the structure and joint crack of utility tunnels, as well as the
deformation, stress, acceleration, and failure characteristics of anchor bolt
structures under seismic load and different lines of utility tunnels, are
comparatively analyzed by studying the prefabricated underground utility tunnel
on Weiyi Road in Xi′an, China. The following results
are obtained. (1) The maximum horizontal displacement of the brokenline utility tunnel in x and z directions
is near the bottom plates between the connection section of the shallowburied and deepburied sections, indicating
that the connection section between sections with higher elevation and that
with lower elevation is the deformation sensitive point. (2) The tension
deformation of a joint crack of a brokenline utility
tunnel during and after seismic is relatively small, whereas the horizontal and
vertical sliding deformations are relatively large, with the horizontal sliding
deformation being the largest. (3) Compared with the straightline utility tunnel, the failure value of the brokenline utility tunnel is greater, and the failure mainly occurs in the
inclined section, most of which are tensile failures. In the actual design
work, it is necessary to enhance the strength of the utility tunnel at the
brokenline section.
