高寒地区路基岩土体冻融循环强度损伤研究

Study on Freeze-Thaw Cycle Strength Damage of Subgrade Rock-soil Mass in Alpine Region

文章在参考前人研究的基础上,选取寒区地区路基进行冻融循环试验,研究在季节性冻融循环的条件下,路基岩土体的强度变化。结果表明:岩土体在实验过程中呈现出应变软化现象;随着循环次数的增加,岩土体的内聚力降低约32%,内摩擦角出现相对增大约5.0%;通过岩土体破坏时偏应力与循环次数的关系可以发现,随着循环次数的增加,岩土体强度变化速率逐渐降低;冻融循环在第6次循环时强度变化达到稳定状态;在高寒地区建设交通设施时,需要充分考虑路基填料的防冻措施。

Based on the previous studies,this article selects the subgrade in the cold area for the freeze-thaw cycle test to study the strength variation of subgrade rock-soil mass under the conditions of seasonal freeze-thaw cycles.The results show that the rock-soil mass exhibits the strain softening phenomenon during the experiment;with the increase of cycle number,the internal cohesion of rock- soil mass decreases by about 32%,and the internal friction angle shows the comparative increase of about 5.0%;through the relationship between the deviatoric stress and the cycle number during the damage of rock- soil mass,it can be found that,with the increase of cycle number,the changing rate of rock-soil mass strength is decreasing gradually;the intensity changing of freeze-thaw cycle reaches a steady state at the 6th cycle;thus,when constructing the transportation facilities in alpine regions,it is required to fully consider the construction of antifreeze measures for roadbed fillers.