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首次利用钻孔旁压仪对青藏公路沿线典型地段多年冻土的力学性质进行了原位测试 .利用平面弹性体理论和Lame提出的无限弹性介质中的圆柱孔穴径向膨胀方程对试验曲线进行解译 .结果表明 ,冻土的旁压模量、旁压比例界限、极限压力随着温度的降低而增大 ;含水量在一定范围内变化时冻土的旁压模量、旁压比例界限、极限压力与之呈正相关 ,当其超过一定限度时它们之间呈负相关 ;容重与冻土的旁压模量、旁压比例界限、极限压力呈正相关 .低温冻土较高温冻土稳定 .
For the first time, the mechanical properties of permafrost in a typical section along the Qinghai-Tibet Highway were tested by in-situ drilling pressure table.Based on the plane elastic theory and the radial expansion equation of cylindrical cavity in infinite elastic medium proposed by Lame, the experimental curves were solved The results show that the compressive modulus, pressure ratio limit and pressure of permafrost increase with the decrease of temperature. When the water content changes within a certain range, The ultimate pressure is positively correlated with it. When it exceeds a certain limit, there is a negative correlation between them. The bulk density is positively correlated with the compressive modulus, pressure ratio and pressure at the permafrost.