寒区隧道衬砌冻胀力室内模型试验研究

doi:10.13722/j.cnki.jrme.2014.1633

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摘要为了得到寒区巴郎山隧道衬砌安全性评价时所需的冻胀力荷载，进行了室内模型试验。将隧道板岩岩体视为裂隙介质，主要研究由水分在裂隙中迁移产生的冻胀。模型中铺设透水布模拟裂隙，采取隧道洞腔内降温的方式模拟隧道受到的低温条件。运用热电阻元件和应变片测试试验中衬砌的温度和应变变化。试验结果表明：衬砌的冻胀应变在仰拱和仰拱脚处较小，在拱顶、拱脚和边墙处较大，最大处发生在边墙。采用数值模拟方法，分析岩石圈整体冻胀模型和含水风化层冻胀模型在衬砌上的应力分布模式，与室内模型试验结果相比较，确定选择含水风化层冻胀模型为巴朗山隧道冻胀荷载计算方法，即冻胀荷载可为衬砌边墙上的水平侧向荷载，冻胀力的大小可以按照洞口0.9 MPa，洞身0.6 MPa取值。

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关键词 ：公路隧道, 冻胀力, 室内模型试验, 裂隙介质

Abstract：A model test was performed on distribution form of frost heaving of tunnel lining in laboratory. The surrounding rock(slate) of the tunnel was considered as fissured medium，so the frost heaving caused by water migration in fissures was mainly studied. In the model，the fissures were realized by laying seepy fabric among surrounding rock，and the low temperature condition was realized by putting refrigeration equipment in tunnel. The temperature and strain changes were measured by resistance thermometer elements and strain gages，respectively. The laboratory test results prove that the deformations in inverted arch and near the foot of inverted arch are smaller，in arch，arch spring and side wall are larger，the largest is in side wall. For further studying the distribution forms，the numerical simulation method was applied for analyzing frost heaving force calculated by different frost model. Compared the numerical simulation results with the converted laboratory model test results，the frost model of frost heaving force produced by the water-contained weathered rock layer was selected. That is，the frost heaving force is lateral and level acting on side wall of the tunnel lining，0.9 MPa in entrance and 0.6 MPa in tunnel trunk.

Key words： highway tunnel frost heaving pressures laboratory model test fissured medium

引用本文:

渠孟飞1，谢强1，胡熠2 ，李朝阳1. 寒区隧道衬砌冻胀力室内模型试验研究[J]. 岩石力学与工程学报, 2015, 34(09): 12-12.
QU Mengfei1，XIE Qiang1，HU Yi2，Li Zhaoyang1. A MODEL TEST STUDY ON FROST HEAVING PRESSURES ON TUNNEL LINING IN COLD REGION. , 2015, 34(09): 12-12.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1633 或 http://www.rockmech.org/CN/Y2015/V34/I09/12

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