预测压气法隧道施工中的漏气量的模型研究

孙冬梅; 冯平; 张明进; G.Steger

预测压气法隧道施工中的漏气量的模型研究 English Version

天津大学建工学院；交通部天津水运工程科学研究院水工构造物检测诊断与加固技术交通行业重点实验室；奥地利格拉茨技术大学土力学及基础工程研究所；

基金项目: 国家自然科学基金青年基金项目(50809044);;国家自然科学基金项目(50579049);;博士后科学基金项目(20080440682)

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出版历程
- 发布日期: 2009-07-14

Prediction of air losses in compressed air tunneling using numerical models

1.School of Civil Engineering of Tianjin University Tianjin 300072 China 2.Key Lab of Harbor Marine Structure Safety of Ministry of Communications Tianjin Research Institute of Water Transport Engineering Tianjin 300456 China 3.Institute for Soil Mechanics and Foundation Engineering Graz Univeristy of Technology Graz 8010 Austria

摘要

摘要: 在阐述压气法隧道施工原理的基础上,建立了水–气二相流模型来模拟压气法隧道施工过程中超压空气驱替隧道周围土体的孔隙水的水–气二相流过程。该模型同时考虑了土体中气相和水相的流动以及水相和气相相互作用的影响,比较符合水–气二相渗流过程的物理意义。通过工程算例,计算出不同施工进度下开挖面和隧道混凝土衬砌上的空气损失速率以及空气入流对隧道周围土体渗流场的影响,结果表明:在均质的地质条件下,开挖面上的漏气速率一般为常数,而衬砌上的漏气速率将随着隧道长度的增加而线性增大。最后,提出了利用水–气二相流模型进一步提高压气法隧道施工的漏气量的数值模拟精度,需要深入研究的两点意见。
- 压气法隧道施工技术 /
- 水–气二相流模型 /
- 漏气量 /
- 数值模拟
Abstract: A numerical model based on the theory of water-air two-phase flow model is proposed to simulate the process of the transient air flows from the compressed air tunnel into the surrounding ground induced by excess air pressure inside the tunnel.The transition between water phase and gas phase in seepage process is taken into account.In order to allow an accurate prediction of the amount of air losses in the design process and to provide pore pressure distributions,the air loss rates through the tunnel face and shotcrete lining and the distribution of seepage field in different advance rates for subway tunneling are calculated through a numerical example.The analytical results show that for the homogeneous formation the magnitude of air loss rate through the tunnel face is constant along the advance of the tunnel,however,the air loss rate through the shotcrete lining increases linearly with increasing length.Finally,two suggestions for improving the accuracy of numerical simulation of prediction of air losses in compressed air tunneling using water-air two-phase flow model are presented.
- compressed air tunneling /
- water-air two-phase flow model /
- air loss /
- numerical simulation

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