地铁盾构下穿建筑群施工地面建筑沉降控制方案及 富水砂-黏地层沉降预测方法
陈志敏1,2范长海1张常书3
Building Subsidence Control in Metro Shield Tunneling under Construction Ground of Buildings and Water-rich Sand-clay Stratum Subsidence Prediction Method
CHEN ZhiminFAN ChanghaiZHANG Changshu
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作者信息:1.1.兰州交通大学土木工程学院，730070，兰州；
2.2.兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室，730070，兰州；
3.3.中铁十八局集团有限公司，300222，天津
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Affiliation:School of Civil Engineering, Lanzhou Jiaotong University, 730070, Lanzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.01.008
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中图分类号/CLCN:U455.43;P642.26
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栏目/Col:研究报告
摘要:
以广州地铁某区间隧道下穿城市密集建筑群工程为例，利用MIDAS GTS NX软件模拟施工过程，研究盾构穿越富水砾砂、粉质黏土和全风化-微风化花岗岩等复合地层时，地层与地面建筑物的沉降规律，并对比分析线间注浆加固和筏板结构加固方案的有效性。研究结果表明：相较于筏板结构加固方案，线间注浆加固方案可显著控制建筑物与桩基持力层的变形失稳及裂隙水渗流损失。所提经验公式法适用于线间注浆加固工况下的地层沉降变形预测。
Abstracts:
Relying on an interval tunnel project of Guangzhou Metro under-passing dense urban building group, MIDAS GTS NX software is adopted to simulate the construction process, the ground and surface building subsidence law when the shield passes through composite strata such as water-rich gravel sand, silty clay and completely-slightly weathered granite is studied. The effectiveness of the inter-line grouting reinforcement and the raft structure reinforcement schemes are comparatively analyzed. Research results show that, compared with the raft structure reinforcement scheme, the inter-line grouting reinforcement scheme can significantly control the deformation and instability of the building, the pile foundation supporting layer, and the seepage loss of fissure water. The proposed empirical formula method is suitable for the stratum subsidence deformation prediction under inter-line grouting reinforcement working condition.
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