土岩地层地铁车站钢托座抗浮结构抗浮特征研究  

RESEARCH ON THE ANTI-FLOATING STRUCTURE AND ANTI-FLOATING CHARACTERISTICS OF STEEL BRACKETS IN SUBWAY STATIONS WITH SOIL AND ROCK STRATA

作　　者：孙毅 徐武 刘鹏[2] 周小涵 SUN Yi;XU Wu;LIU Peng;ZHOU Xiao-han(CCCC Second Highway Engineering Bureau Co.,Ltd.,710054,Xi'an,China;College of Civil Engineering,Chongqing University,400045,Chongqing,China)

机构地区：[1]中交第二公路工程有限公司,西安710054 [2]重庆大学土木工程学院,重庆400045

出　　处：《建筑技术》2023年第9期1108-1113,共6页Architecture Technology

摘　　要：结合土岩地层下部基岩强度高的特点,在地铁车站抗浮设计中提出了一种新型抗浮结构,即钢托座抗浮结构,且在某地铁车站抗浮设计中得到了应用,但目前其抗浮特性及力学效应尚不明确。基于此,采用有限差分软件FLAC^(3D),在相同抗浮控制指标下对比“抗拔桩”和“钢托座抗浮结构+抗拔桩”两种不同抗浮措施作用下地铁车站结构的变形与受力情况,阐述了钢托座抗浮结构的抗浮特征。结果表明,钢托座抗浮结构承担56.53%地铁车站所受地下水浮力,对结构抗浮有显著效果。与仅采用抗拔桩的工况相比,钢托座抗浮结构能节约62.73%的抗拔桩工程量,但会改变车站主体结构的内力与应力分布情况。钢托座抗浮结构能减小车站周围地层沉降,减小最大以及最小主应力水平,对最大主应力分布的影响较大。Combining the characteristics of high strength of the lower bedrock of soil-rock strata,a new type of anti-floating structure,i.e.,steel bracket anti-floating structure,is proposed in the anti-floating design of subway stations,and is applied in the anti-floating design of a subway station,but its anti-floating characteristics and mechanical effects are not clear yet.Based on this,the finite difference software FLAC^(3D) was used to compare the deformation and force of the subway station structure under the different anti-floating measures of"uplift pile"and"steel bracket anti-floating structure+uplift pile"with the same anti-floating control index,and the anti-floating characteristics of the steel bracket anti-floating structure were described.The results show that the steel bracket anti-floating structure bears 56.53%of the groundwater buoyancy of the subway station and has a significant effect on the anti-floating of the structure.Compared with the case of using only uplift piles,the steel bracket anti-floating structure can save 62.73%of the work volume of uplift piles,but it will change the internal force and stress distribution of the main structure of the station.The steel bracket anti-floating structure can reduce the stratum settlement around the station and decrease the maximum and minimum principal stress levels,which has a greater impact on the maximum principal stress distribution.

关 键 词：土岩地层 钢托座抗浮结构 地铁车站 抗浮特征 

分 类 号：TU43[建筑科学—岩土工程]