深埋双圆盾构隧道的横向地震响应特性研究

发布时间：2018-08-06 09:23

【摘要】：阐述反应位移法的基本原理和深埋双圆盾构隧道的地层荷载模式,并基于反应位移法和梁弹簧模型,对双圆盾构隧道仅受静载和静载与水平剪切地震荷载同时作用下结构的变形和内力等动力响应特性进行研究。分析表明:与对称静载作用下相比,在静载与地震荷载同时作用时,结构的变形和内力不再是对称的;弯矩和变形走势基本一致,两洞各自上半圆的迎地层位移侧和下半圆的背地层位移的衬砌基本都有向洞内的位移和内侧受拉的弯矩,两洞各自上半圆的迎地层位移侧和下半圆的背地层位移的衬砌基本都具有相反方向的位移和弯矩,与中柱底部连接处的弯矩集中现象得到消除;衬砌的轴力不再是全部为受压值,而是出现大范围受拉的情况,且拉力值较大,中柱的压力值减小十分明显;与中柱连接处的剪力集中现象消除明显,远离中柱处的管片衬砌剪力绝对值增大明显。
[Abstract]:The basic principle of the reaction displacement method and the formation load mode of the deep buried double circular shield tunnel are expounded. Based on the reaction displacement method and the beam spring model, the dynamic response characteristics of the double circular shield tunnel under the simultaneous action of static load and static load and horizontal shear seismic load are studied. The analysis shows that the double circular shield tunnel is with the symmetrical static load. Under the action of static load and seismic load, the deformation and internal force of the structure are no longer symmetrical, the bending moment and the deformation trend are basically the same. The displacement of the two holes in the upper and lower semicircle of the upper and lower semicircle basically have the displacement in the hole and the bending moment in the inside and the two hole in the upper half circle. The lining of the lateral and lower semicircle of the lateral and lower semicircle basically has the opposite direction of displacement and bending moment, and the bending moment concentration at the bottom of the middle column is eliminated; the axial force of the lining is no longer all the compression value, but a large range of tension, and the tension value of the middle column is very obvious; and the pressure of the middle column is very obvious; The shear concentration phenomenon at the column connection is eliminated obviously, and the absolute value of the shear lining of the segment far away from the middle column increases obviously.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：教育部新世纪人才资助项目(NCET-11-0713) 国家自然科学基金资助项目(51178400,U1134208)
【分类号】：U452.28

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