地铁均布荷载引起地基土的沉降分析

Analysls of Foundation Settlement Under Uniformly Load of Subway

分析了地基土在地铁均布荷载作用下的沉降规律。结果表明:在单次列车运行期间内,地面的沉降较大,并且呈现波动现象;在双面加载过程中,隧道纵向中间部分的沉降较大;长期累积作用不可忽视;由于地基土沉降以不可恢复的塑性永久变形为主,因此,对于长期列车动载作用下地基的变形问题,采用塑性本构模型能较好地描述地基土变形的不可恢复性和长期累积性。

In this text, it has shown the regularity of foundation settlement under uniformly load of subway. It can be seen that： during the single train runtime, settlement of ground surface is larger, and fluctuated. Under the double uniformly load of subway, settlement is larger in the middle of longitudinal direction of tunnel. The effecti of long-term buildup can not be ignored. Because foudation settlement is mainly composed of unrecoverable plastic deformation, as to the problem of long-term dynamic loads of subway, plastic constitutive relation is more suitable. That will be better to describe the characteristic of unrecoverable and long-term buildup of foundation soil.