双线盾构施工地面沉降槽形状判别数值研究
汪壮壮1,2,3汪学清3杨晶晶1,2赵云猛3陈博3
Numerical Study on Shape Discrimination of Land Subsidence Groove during Double-line Shield Construction
WANG Zhuangzhuang1,2,3WANG Xueqing3YANG Jingjing1,2ZHAO Yunmeng3CHEN Bo3
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作者信息:1.中建材(合肥)钢构科技有限公司，230051，合肥
2.合肥水泥研究设计院有限公司，230051，合肥
3.中国矿业大学(北京)力学与土木工程学院，100083，北京
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Affiliation:1.CNBM (Hefei) Steel Structure Technology Co., Ltd., 230051, Hefei, China
2.Hefei Cement Research & Design Institute Co., Ltd., 230051, Hefei, China
3.School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, 100083, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.008
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］双线盾构施工地面沉降槽形状会随隧道净距、埋深发生变化，因此需对沉降槽随净距、埋深的演化机理进行深入研究。［方法］以成都地铁17号线小南街站—人民公园站区间双线盾构工程为依托，采用数值模拟方法分析了不同净距-埋深组合工况下双线盾构施工的地面沉降槽形状变化过程，基于双线地面沉降公式拟合出各工况中各项取值，并提出沉降槽形状判据S。［结果及结论］Peck公式和刘波公式能较好地表达地面沉降的模拟监测结果：当S∈［0.319,0.536)时，沉降槽呈“V”形；当S∈［0.536,0.783)时，沉降槽呈“U”形；当S∈［0.783,1.120)时，沉降槽呈“浅W”形；当S∈［1.120,3.873)时，沉降槽呈非对称“W”形；当S≥3.873时，沉降槽呈“双V”形或“双W”形。当隧道埋深为1D(D为隧道直径)，且两隧道之间的净距为2D至3D时，两隧道中线附近的地面会出现隆起现象，并且随着净距的增加，隆起的范围也会相应增大。在两隧道中心正上方的地面上，由于盾尾注浆压力的作用，部分沉降被抵消，导致该区域的沉降槽呈现出独特的“双W”形形态。
Abstracts:
［Objective］ The shape of the land subsidence grooves during double-line shield construction varies with the clear distance and buried depth of the tunnel. Thus, it is necessary to conduct an in-depth study on the evolution mechanism of the subsidence groove with clear distance and buried depth. ［Method］ Based on the double-line shield project between Xiaonanjie Station and Renmin Park Station of Chengdu Line 17, numerical simulation is used to analyze the shape change process of the subsidence groove in the double-line shield construction under different clear distance-buried depth combination working conditions. Based on the double-line land subsidence formula, the values of each item in each working condition are fitted, and the shape criterion S of the subsidence groove is proposed. ［Result & Conclusion］ Peck formula and Liu Bo formula can express the simulated monitoring results of land subsidence well. When S∈［0.319, 0.536), the subsidence groove is in a V-shape; when S∈［0.536, 0.783), the subsidence groove is in a U-shape; when S∈［0.783, 1.120), the subsidence groove is in a shallow W-shape; when S∈［1.120, 3.873), the subsidence groove is in an asymmetric shallow W-shape; when S≥3.873, the subsidence groove is in a double V-shape or a double W-shape. When the buried depth of the tunnel is 1D (D is the tunnel diameter) and the clear distance between the two tunnels is 2D to 3D, the ground near the middle line of the two tunnels will bulge, and with the increase of the clear distance, the range of the bulge will increase accordingly. On the ground directly above the center of the two tunnels, due to the effect of the shield tail grouting pressure, part of the subsidence is offset, resulting in a unique double W-shape of the subsidence groove in this area.
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