圍巖類型及襯砌厚度對(duì)水工隧洞地震動(dòng)力響應(yīng)的影響分析
[Abstract]:In order to analyze the deformation and failure mechanism of hydraulic tunnel under seismic excitation, according to the displacement change of hydraulic tunnel under different surrounding rock types and lining thickness, according to the seismic calculation theory of underground structure, By selecting reasonable material parameters and model boundary conditions, the three-dimensional finite element model of a hydraulic tunnel is established by using ANSYS, and horizontal and vertical seismic excitation is applied to it. The dynamic response of tunnel structure model under different surrounding rock types and lining thickness is calculated by transient analysis method. The results show that under the same lining thickness, with the decrease of surrounding rock strength of tunnel, the influence degree of horizontal displacement and vertical displacement is obviously different, that is, the horizontal displacement is larger and larger, and the vertical displacement has no obvious law to follow. Under the same surrounding rock strength, the hydraulic tunnel does not tend to be stable with the increase of lining thickness. In the case of type III surrounding rock, the displacement of hydraulic tunnel increases with the increase of lining thickness. The change of lining thickness under class V surrounding rock has little effect on the displacement of hydraulic tunnel. Therefore, reasonable design of surrounding rock type and lining thickness can not only meet the seismic performance requirements of hydraulic tunnel, but also reduce the project cost. The research results have reference value for reasonable design of tunnel lining thickness and enhancement of seismic performance.
【作者單位】: 鄭州大學(xué)水利與環(huán)境學(xué)院;鄭州市水利建筑勘測(cè)設(shè)計(jì)院;
【分類號(hào)】:TV312;TV672.1
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