| 黄博,曾宇,杜怡韩,于千,邹煜,周莉莉.PBA工法暗挖车站导洞施工应力场分布研究[J].安徽建筑大学学报,2022,30(4):6-13，34 |
| PBA工法暗挖车站导洞施工应力场分布研究 |
| Study on Stress Field Distribution of Subsurface Excavated Station During Heading Construction by Pile-Beam-Arch Method |
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| DOI： |
| 中文关键词: 地铁 应力场分布 数值计算 PBA 工法 导洞施工 开挖顺序 |
| 英文关键词: subway stress field distribution numerical calculation pile-beam-arch method heading construction excavation sequence |
| 基金项目:安徽省高等学校自然科学研究项目（KJ2018A0108，KJ2018A0118）；国家级大学生创新创业训练计划项目（202010363117）； 安徽工程大学国家基金预研项目（2019yyzr08）；安徽工程大学校级科研项目（Xjky110201912） |
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| 中文摘要: |
| 为研究地铁车站采用PBA工法施工时，导洞开挖顺序对车站范围土体竖向应力分布的影响，利用数值模拟的方法，建立了双层双向开挖的导洞群数值模型，提出4种导洞施工方案进行对比，给出了特征平面应力场分布图，着重分析了不同施工方案对应力场分布规律、应力集中系数及应力极值点位置等的影响。结果表明：先开挖上层或下层导洞，会使得先开挖导洞所在层周围土体的应力集中程度高于后开挖者；从应力集中程度、塑性区分布和施工便利性的角度综合考虑，方案四和方案一可在实际施工中优先选用；应力极值点基本都处于车站靠横通道进口一侧，在交叉区域形成较为明显的应力集中现象，施工中需要做好交叉口的支护作业来应对这一问题。 |
| 英文摘要: |
| To investigate the influences of heading excavation sequence on vertical stress distribution of soil around the subway station by PBA method，a numerical model of bi-directional，double-layer pilot tunnel groups excavation is built by numerical simulation. Four construction schemes are put forward and compared to derive stress field distribution of characteristic planes in each scheme，and different stress field distribution laws，stress concentration coefficients and locations of stress extreme points are particularly analyzed. The results show that stress concentration of the soil around the first excavated pilot tunnel is higher than that of the later excavated one. The scheme IV and I are preferable considering the stress concentration degree，plastic zone distribution and construction convenience. The stress extreme points are basically located at the inlet of the cross passage of the station，led to a higher stress concentration in the intersection area，hence a well-designed support system is necessary in the construction process. |
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