人工冻结施工便道力学性能试验研究

Experimental Research on Mechanical Property of Artificial Freezing Construction Road

目前人工冻结法被广泛用于临时土体强度加固,使土层在冻结期间强度大大提高,满足工程需求,融化后可恢复原状,降低对环境的污染和破坏。为探索人工冻结法在输电线路施工便道中的应用前景,开展了冰、冻土试样的物理力学性能试验,并对人工冻结路基力学性能进行了模型试验。试验结果表明:随着温度降低,冰试样的单轴抗压强度逐渐增加,冻土的粘聚力和内摩擦角有增大的趋势;回填土在冻结状态下压缩性较常温时显著降低;人工注水冻结路面厚度越大,在相同荷载作用下,冻结路面和路基的整体位移越小,厚度大于10 cm的冻结路面可以通过小型施工机械。

At present, the artificial freezing method is widely used to temporarily reinforce the strength of the soil so that the soil layer strength is greatly increased during the freezing period to meet the engineering needs. After melting, it can be restored to its original condition, reducing pollution and damage to the environment. In order to explore the application prospect of artificial freez-ing method in construction access road of transmission line, the physical mechanics perfor-mance tests of the ice and frozen soil have been developed. And the model experiment has been carried on to study the mechanical property of the artificial freeze roadbed. The results of the experiment show that: as the temperature decreases, the uniaxial compressive strength of ice specimen increases gradually, and the cohesive strength and internal friction angle of frozen soil have the tendency which increases;the compressibility of backfill soil in frozen state is signifi-cantly lower than that at normal temperature;and under the same load, the overall displace-ment of the frozen road decreases with the increase of the artificial water flooding freeze pavement thickness, and small construction machines can pass through pavements with a thickness more than 10 cm.