Guo Haotian, Lin Yuli, Sun Chao, Mao Xin, Li Jinfeng
School of Geometrics and Prospecting Engineering, Jilin Jianzhu University, Changchun, 130118, China.
College of Construction Engineering, Jilin University, Changchun, 130026, China.
Sci Rep. 2023 Aug 12;13(1):13141. doi: 10.1038/s41598-023-40261-y.
The effect of temperature on the dynamic parameters of silty clay in a seasonally frozen region was assessed using a GDS dynamic triaxial test system. The strength parameters, dynamic elastic modulus, damping ratio, and other dynamic parameters of the soil samples were analyzed under different temperature conditions. The results demonstrated that the shear strength parameters (internal friction angle and cohesion) of the silty clay under a dynamic load increased significantly with decreasing temperature, and the internal friction angle increased sharply below 0 °C. The dynamic elastic modulus increased as the temperature decreased and changed significantly in the ice-water phase change region. The slope of the dynamic stress-strain curve of the soil sample increased significantly with decreasing temperature. As the temperature decreased, the damping ratio reduced, and the ability of the soil to absorb seismic waves declines. The research results provide new data and information to guide construction projects in seasonally frozen region.
利用GDS动三轴试验系统评估了温度对季节性冻土地区粉质黏土动力参数的影响。分析了不同温度条件下土样的强度参数、动弹性模量、阻尼比等动力参数。结果表明，动荷载作用下粉质黏土的抗剪强度参数（内摩擦角和黏聚力）随温度降低而显著增大，且在0℃以下内摩擦角急剧增大。动弹性模量随温度降低而增大，在冰水相变区域变化显著。土样动应力-应变曲线的斜率随温度降低而显著增大。随着温度降低，阻尼比减小，土体吸收地震波的能力下降。研究结果为指导季节性冻土地区的建设工程提供了新的数据和信息。
