回头沟隧道围岩冻胀率实验研究

Experimental Study on Frost Heave Rate of Surrounding Rock in Huitougou Tunnel

为了避免冻胀力对寒区隧道的影响,该文通过对回头沟隧道三个断面的裂隙进行现场调查,了解了各个断面的裂隙状况,并选取隧道围岩进行了岩石冻胀性试验,分析了不同温度下围岩应变随时间的变化规律,得到岩石的线性膨胀率。结合裂隙的发育情况,经过理论计算得到各断面的围岩冻胀率,为后期围岩冻胀力和隧道防冻的研究奠定了基础。

In order to avoid the influence of frost heaving force on tunnels in cold region, this paper investigates the fissures of three sections of Huitougou Tunnel in situ , the fissures of each section are understood. The surrounding rock of tunnel are chosen to carry out rock frost heaving test, the variation law of strain of surrounding rock with time under different temperatures are analysed, and the linear expansion rate of rock is obtained. Combining with the development of fissures , through the theory calculation, the frost heaving rate of surrounding rock of each section is obtained, which lays a foundation for the study of frost heave force of surrounding rock and tunnel frost prevention.