冻融循环作用下路基黏土小应变剪切模量试验研究

Experimental Research on Small Strain Shear Modulus of Subgrade Clay under the Action of Freeze-thaw Cycle

为考察冻融作用对路基黏土力学性能的影响,选定小应变剪切模量作为考察指标,以弯曲元剪切波速试验为考察手段,定量研究了冻融循环作用对路基黏土小应变剪切模量的影响。研究结果表明,路基黏土的小应变剪切模量在冻融次数达到7次之后衰减幅度趋于平缓,与未冻融相比,路基黏土的小应变剪切模量的衰减量达到了46.8%~60.4%,该研究结论有助于从力学的角度揭示冻融循环作用对土体结构性能的影响。

In order to investigate the effect of freeze-thaw action on the mechanical properties of subgrade clay,the small strain shear modulus is selected as the investigation index,and the effect of the action of freeze-thaw cycle on the small strain shear modulus of subgrade clay is quantitatively studied by means of the bending element shear wave velocity test.The research results show that,the attenuation range of small strain shear modulus of subgrade clay tends to be gentle after 7 times of freeze-thaw.Compared with non-freeze-thaw,the attenuation of small strain shear modulus of subgrade clay reaches 46.8%~60.4%.This research conclusion is helpful to reveal the effect of the action of freeze-thaw cycle on the soil structural properties from the perspective of mechanics.