抗拔桩和压顶梁对明挖地铁车站内力影响分析

在高地下水位地区修建地铁车站,往往存在抗浮问题。抗浮问题处理得当与否直接关系着地铁车站正常使用期间的可靠度。而采用不同抗浮措施会对结构内力产生不同的影响,为研究这种影响并希望从结构受力角度对车站抗浮提出一定的建议,结合一个明挖地铁车站实例,针对目前最常见的2种抗浮措施——压顶梁和抗拔桩进行数值计算,发现抗拔桩具有改善结构受力的作用,在结构跨度较大时应采用抗拔桩或者抗拔桩与压顶梁联合抗浮的措施,在结构跨度较小时,可优先考虑压顶梁抗浮。

Analysis of the Impact of Uplift Pile and Coping Beam on Internal Force of Metro Stations Constructed by Open-and-cover

There often exists anti-floating problem in the construction of the subway station in high water table areas. The handling of anti-floating is directly related to the reliability of subway station during normal operation of the subway station. Handling anti-floating with different measures may have different effects on the internal forces of the structure. To study the effects and seek some suggestions in the light of structural stresses,this paper,with reference to a metro station constructed with cut-and-cover method and on the basis of the two most common anti-floating measures — capping beam and uplift pile in the numerical calculation,concludes that the uplift pile can improve the effect of the structural stress,when the span of the structure is large,the uplift pile alone or the combination of uplift pile and capping beam shall be employed to fulfill anti-floating; if the span is small,capping beam shall be prioritized.