Study on lining external water pressure under limited discharge in deep buried tunnel
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摘要: 针对深埋岩溶隧道衬砌外水压力展开研究，根据隧道排水量和衬砌水压力模型的理论推导，结合试验进行分析。结果表明，衬砌上水压在采取排水措施后随排水量的增加而减小；但是当注浆材料渗透系数降低到1.65×10-6 m/s、注浆厚度到55 cm后，衬砌上水压随注浆范围的增大变化已经不太明显，说明注浆半径的选取有一个合理范围。注浆圈可以起到控制排水的作用，当给定了隧道某一段的合理排放量以后，就可以确定注浆的范围和注浆水平。Abstract: Lining external water pressure under limited discharge in deep buried tunnel is studied in the paper by means of theoretical derivation of tunnel discharge and lining water pressure model. It is proved that lining upper water pressure decreases along with the increase of discharge after adopting drainage measures, but the lining upper water pressure increases little with the increase of cementing scope when the permeability coefficient of grout drop below 1.65×10-6m/s and the grout thickness reach 55cm, which shows that there should be a reasonable scope for cementing. Grouting can control the discharge of tunnel. Grouting area can be defined when the reasonable discharge from a passage tunnel are given.
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Key words:
- tunnel external water pressure /
- lining /
- discharge /
- injection grout
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