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首页> 外文期刊>Bulletin of engineering geology and the environment >Groundwater control and curtain grouting for tunnel construction in completely weathered granite
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Groundwater control and curtain grouting for tunnel construction in completely weathered granite

机译：全风化花岗岩隧道施工中的地下水控制和帷幕灌浆

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摘要

During tunnel construction, groundwater inrush from completely weathered granite strata is a significant challenge to geotechnical engineers. Up to the present, prevention of water inrushing hazards is almost exclusively based on the experience of engineers. This paper presents a coupled seepage-erosion water inrush model to investigate the characteristics of seepage-erosion properties. The proposed model is based on classical theories of solute transport and fluid dynamics in porous media. In the model, changes of porosity link permeability with the accumulation of particle loss in the seepage-erosion process. The coupled seepage-erosion model was applied to examine the influence of curtain grouting thickness on the seepage-erosion process. The results showed that the seepage-erosion process was attenuated as thickness increased. The results also showed that the porosity and permeability visibly changed and the water inflow clearly exceeded the acceptable engineering criterion when the thickness was less than 6 m. However, with a further increase in thickness, the seepage-erosion process was suppressed and little changes of the relative parameters were showed. The numerical results demonstrated that a curtain grouting thickness of 6 m was suitable for curtain grouting in completely weathered granite. Field investigation of Cenxi tunnel verified the effectiveness of the thickness determined by the proposed model.
机译：在隧道施工期间，完全风化的花岗岩地层涌入的地下水对岩土工程师来说是一个巨大的挑战。迄今为止，几乎完全基于工程师的经验来预防水浸危险。本文提出了一种渗流-侵蚀耦合的突水模型，以研究渗流-侵蚀特性的特征。该模型基于多孔介质中溶质运移和流体动力学的经典理论。在该模型中，孔隙度的变化将渗透率与渗漏侵蚀过程中的颗粒损失累积联系起来。应用耦合渗流-侵蚀模型研究了帷幕灌浆厚度对渗流-侵蚀过程的影响。结果表明，渗漏侵蚀过程随着厚度的增加而减弱。结果还表明，当厚度小于6 m时，孔隙率和渗透率明显改变，进水量明显超过了可接受的工程标准。但是，随着厚度的进一步增加，渗漏侵蚀过程得到了抑制，相对参数几乎没有变化。数值结果表明，帷幕灌浆厚度为6 m适于完全风化花岗岩的帷幕灌浆。岑溪隧道的现场调查验证了所提模型确定厚度的有效性。

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  • 作者

    Liu Jinquan; Chen Weizhong; Yuan Jingqiang; Li Changjun; Zhang Qingyan; Li Xiaofei;

  • 作者单位

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Curtain grouting thickness; Seepage-erosion; Water inrush model; Completely weathered granite;

    机译：帷幕灌浆厚度;渗透侵蚀;突水模型;风化花岗岩;

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