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首页> 外文期刊>Advances in civil engineering >Novel Excavation and Construction Method for a Deep Shaft Excavation in Ultrathick Aquifers
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Novel Excavation and Construction Method for a Deep Shaft Excavation in Ultrathick Aquifers

机译：超薄含水层深轴挖掘的新型开挖和施工方法

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摘要

Dewatering using the dewatering systems composed of diaphragm walls and pumping wells is commonly adopted for deep excavations that are undertaken in deep aquifers. However, dewatering can sometimes induce environmental problems, especially when diaphragm walls cannot effectively cut off the aquifers. This paper mainly presents an innovative excavation technique combining dewatering excavation and underwater excavation without drainage, which is employed for a deep shaft excavation in ultrathick aquifers (up to 60-70m thick aquifer) in Fuzhou, China. The shaft excavation with the depth of 41.6m below the ground surface (BGS) is divided into two major phases, that is, (1) the first part of the excavation (the depth of 23.6m BGS) is conducted by the way of conventional dewatering and braced excavation (Phase I) and (2) the second excavation with the depth of 23.6m to 41.6m BGS is carried out by the novel underwater excavation without drainage technique (Phase II). Field monitoring results show that the ratios of maximum ground surface settlement delta(vm) to the excavation depth H-e in this case ranged from 0.03% to 0.1%. Most of the ratios of maximum lateral wall deflection delta(hm) to excavation depth H-e are less than 0.1%. All these results are lesser than that predicted by empirical methods, which also confirmed the applicability of this innovative excavation. Thus, this innovative solution can be applicable to other deep excavations that are undertaken in ultrathick aquifers, especially for the excavation of coarse sediments with high permeability.
机译：使用由隔膜墙和泵浦井组成的脱水系统的脱水通常用于深含水层中进行的深挖掘。然而，脱水有时可以诱导环境问题，特别是当隔膜墙不能有效地切断含水层时。本文主要提出了一种创新的挖掘技术，将脱水挖掘和水下挖掘结合而不引流，这是在福州福州富裕的超深井挖掘中使用，这是在福州，中国福州的深度轴开挖。轴挖掘挖掘在地面（BGS）下方41.6m以下被分成两个主要阶段，即（1）挖掘的第一部分（深度为23.6MBgs）通过常规方式进行脱水和支撑挖掘（IP相）和（2）第二次挖掘，深度为23.6米至41.6MBGS，通过新颖的水下挖掘而无引流技术（II期）。现场监测结果表明，在这种情况下，最大地面沉降δ（Vm）到挖掘深度H-E的比率范围为0.03％至0.1％。最大横向壁偏转Delta（HM）的大部分比率至挖掘深度H-E小于0.1％。所有这些结果比经验方法所预测的那些结果较小，这也证实了这种创新挖掘的适用性。因此，这种创新的解决方案可以适用于超富含含水层的其他深度挖掘，特别是对于高渗透性的粗沉积物的开挖。

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  • 来源
    《Advances in civil engineering》 |2019年第13期|1827479.1-1827479.15|共15页
  • 作者

    Cao Chengyong; Shi Chenghua; Liu Linghui; Liu Jianwen; Lei Mingfeng; Lin Yuexiang; Ye Yichao;

  • 作者单位

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

    Cent S Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China;

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