输水隧道二维地震反应分析

为研究软土中的浅埋输水隧道由于内部水体的作用使其动力特性与一般的交通隧道有所不同.在考虑介质的辐射阻尼的情况下,采用流-固耦合的分析方法分析一穿越河底的大管径输水隧道二维平面应变的地震反应,同时讨论其水体晃动、阻尼系数、内水压力、围岩种类、围岩的不均质分布、围岩和衬砌的非线性及衬砌的厚度对衬砌的地震响应的影响.结果表明:在满水且无内水压力的情况下,流体对隧道衬砌的地震反应影响不是很大;但其水体晃动、辐射阻尼、内水压力、围岩种类、围岩的不均质分布和围岩非线性及衬砌的厚度,对衬砌的地震反应有很大的影响;并且随着内水压力的增加,其地震反应趋于剧烈.

2-D seismic response analysis of water-conveying tunnel

Aiming at the difference of dynamic characteristics between water conveying tunnels in soft soil and common traffic tunnels,seismic responses of the two-dimensional plane strain for a water-conveying tunnel with large diameter through the river bed was analyzed by fluid-solid dynamic interaction analysis method considering the radiation damping of mediums.And the influences of sloshing amplitude of the inner water,coefficient of damping,inner water pressure,kinds and non-uniform distribution of the surrounding rock,nonlinear properties of the surrounding rock and tunnel lining and thickness of the tunnel lining were studied.Results show that,when inner water pressure is zero,the seismic response of lining does not change greatly;while the sloshing amplitude of the water,radiation damping of the medium,inner water pressure,kinds and non-uniform distribution of the surrounding rock,nonlinear properties of the surrounding rock and thickness of the tunnel lining change the seismic response of lining greatly;and the seismic response will be intense when the pressure increases.