昆仑山隧道冻胀力现场测试及其数据分析

冻胀力是冻土隧道支护结构产生病害的主要原因之一，为掌握多年冻土区昆仑山隧道冻胀力的分布形态以及随温度变化的规律，进行了现场测试研究。研究结果表明，到目前为止昆仑山隧道整个支护结构是安全可靠的；冻胀力随着气温、季节的变化而变化，2004年后其变化基本趋于稳定，实测到的冻胀力最大值为0.3 MPa，分布于围岩与初期支护之间仰拱部位；初期支护与二次衬砌之间的冻胀力很小，二次衬砌支护强度可考虑适当减弱；运用影响线理论绘制出了冻胀力包络图，其为确定作用于支护结构上的最不利荷载提供了一种合理有效的方法。

In-situ test and data analysis of frost-heave force of Kunlun Mountain Tunnel

Frost-heave force is one of the main reasons to create disease of supporting structure in frozen soil tunnel; in order to master the distribution shape and the regularity as change as temperature of frost-heave force of Kunlun Mountain Tunnel in permefrast area, in-situ test was carried out. The research results show: by far, the whole supporting structure of Kunlun Mountain Tunnel was safe and reliable; frost-heave force was as change as temperature and season; the change would go to stabilize after 2004, the Max testing frost-heave force was 0.3 MPa, it located in the arch invert between surrounding rock and preliminary bracing; the frost-heave force between preliminary bracing and lining was very small; the supporting strength of lining would consider weaken properly; the frost-heave force envelope curve was plotted by using influence line theory; and it offers a proper and effective method to determine the most disadvantage load which act on the supporting structure.