为研究青藏铁路路基下高温-高含冰量冻土的力学性质,在青藏铁路北麓河试验段开展一系列旁压强度试验。试验研究表明:路基的增加引起路基下多年冻土温度升高,未冻水含量增加,最终导致冻土旁压临塑压力Pf下降31%,旁压极限压力Pl下降44%,旁压剪切模量Gm下降80%。对于高温冻结黏土,富冰冻土和饱冰冻土Gm对温度变化的敏感性高于含土冰层;饱冰冻土的Pf和Pl对温度变化的敏感性高于富冰冻土和含土冰层。 In order to study the mechanical properties of the high temperature-high ice-bearing permafrost beneath Qinghai-Tibet Railway, a series of tests were conducted on Beiluhe pilot section of Qinghai-Tibet Railway. The experimental results show that the increase of subgrade causes the temperature of permafrost to increase, the content of unfrozen water increases, finally resulting in a decrease of 31% in Pf and Pm of pressure drop by 44% and 21% Modulus Gm decreased by 80%. For high-temperature frozen clay, the sensitivity of Gm to the temperature change is higher than that of the earth-covered ice; the Pf and Pl of the full-frozen soil are more sensitive to temperature change than those of the rich and the earth-ice.