| 王兴,张克勋,吴建佳,赵骁.某地铁站非对称坑中坑开挖数值模拟研究[J].安徽建筑大学学报,2014,22(5):26-30 |
| 某地铁站非对称坑中坑开挖数值模拟研究 |
| Numerical Simulation of Dissymmetrical Pit-in-Pit Excavation of Metro Station |
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| DOI：10.11921/j.issn.2095-8382.20140507 |
| 中文关键词: 坑中坑 非对称 变形 数值分析 |
| 英文关键词: Pit-in-Pit Excavation Dissymmetrical Displacement Numerical simulation |
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| 中文摘要: |
| 以兰州地铁1号线盘旋路站基坑工程为背景，通过PLAXIS 2D对基坑整体建模,分析了非对称坑中坑开挖过程中支护结构的变形特性；对比了不同工况下两侧支护桩的位移变化规律；研究了内坑开挖对外侧支护结构的影响。结果表明：非对称坑中坑的开挖不同于对称坑中坑的开挖，左右两侧支护结构的水平位移明显不对称,且由于左侧被动土体开挖过深导致基坑上部整体向右侧发生偏移；内坑开挖对外坑两侧支护桩水平位移的影响系数随着挖深基本呈正态分布；在工程施工时宜对左侧支护桩中部、内坑底左侧等区域进行重点监测和防护。 |
| 英文摘要: |
| The characteristics of the structures of dissymmetrical Pit-in-Pit excavation were studied by using PLAXIS 2D simulated the whole foundation excavation of Panxuan Metro Station, comparing the horizontal displacements of two sides of supporting piles, and analyzing the influence of internal excavation to the outer pit piles. Results showed that dissymmetrical pit-in-pit excavation was different from the symmetrical, and horizontal displacements of retaining structures in both sides are dissymmetrical. It is the passive soil stress of the left soil that leads the upper foundation shifting to the right and horizontal displacements influent curves of the both sides present normal distribution. Strengthen monitor and protect work should be done in the region of the left supporting piles and the bottom of left foundation. |
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