砂泥岩地层超深基坑施工降水技术研究 |
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引用本文: | 严涛,李坤杰,郭治岳,王二力,林锐,彭涛.砂泥岩地层超深基坑施工降水技术研究[J].路基工程,2020,0(2):130-134. |
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作者姓名: | 严涛 李坤杰 郭治岳 王二力 林锐 彭涛 |
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作者单位: | 西南交通大学土木工程学院,成都,610031;中铁隧道集团四处有限公司,南宁,530000;中冶成都勘察研究总院有限公司,成都,610023 |
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基金项目: | 国家自然科学基金资助项目(51508475);四川省科技厅科技创新创业项目(2018RZ0109);中央高校基本科研业务费理工类科技创新项目(2682016CX017);教育部“春晖计划”科研项目(Z2016168);高层次人才队伍建设科研支持项目(10101X10096078) |
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摘 要: | 降水效果的好坏是深基坑施工安全的重要保证,针对超过60 m的南宁轨道3号线青秀山明暗挖地铁车站工程,进行了现场单井及群井降水试验。结果表明:该砂泥岩地层渗透系数为0.5~0.9 m/d。根据渗透系数最终确定青秀山超大埋深明暗挖地铁车站设降水井67口,观察井3口。降水保证了明挖站厅层及暗挖站台层的施工安全。
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关 键 词: | 砂泥岩地层 超深基坑 降水试验 渗透系数 降水设计 |
收稿时间: | 2019-05-20 |
Study on Construction Dewatering Technology of Super-deep Foundation Pit in Sand-mudstone Stratum |
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Abstract: | The effect of dewatering is an important guarantee for the construction safety of deep foundation pit. Based on the Qingxiushan subway station by open-cut and subsurface excavation method with the burial depth of more than 60 meters on Nanning metro line 3 in Guangxi, we carried out field single well and multiple-well dewatering test. And the result shows that the permeate coefficient of the sand-mudstone stratum is 0.5 to 0.9 m/d. According to the permeate coefficient, 67 dewatering wells and 3 observation wells were finally determined for the Qingxiushan subway station with super-deep foundation pit. The dewatering design ensures the construction safety of the open-cut station hall and the underground excavation platform. |
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