1． State Key Laboratory of Frozen Soil Engineering，CAREERI，Lanzhou，Gansu 730000，China; 2． Department of Qinghai Trans． Engineering Supervision，Xining，Qinghai 810008，China; 3． Administration Bureau of Qinghai Local Railway，Xining，Qinghai 810008，China
Abstract：Research purposes: The total length of Chaidaer － Muli Railway is 142． 04km and lots of the unstable and extreme unstable permafrost regions under high temperature are scattered along the railway with the rich ice content of the frozen soil． The frozen soil subgrade faces the situations of the back slope and front slope because the Chaidaer － Muli Railway is from the southeast to northwest． The rubble convection subgrade was adopted in the area of 53km． To ensure the stability of the railway subgrade，it is necessary to analyze and research the cooling effect of the measures for the rubble subgrade convection．
Research conclusions: The monitored data obtained since 2007 show in the warm permafrost region，only the shadow parts of the rubble convection subgrade and the base of the slope can be cooled by adopting the rubble convection subgrade and convection berm and in the low － temperature stable permafrost region，application of rubble convection not only cools the subgrade base，but also plays a certain role in restraining the back slope and front slope．
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2011, Vol. 28 
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