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为了研究含盐量对高等级公路路肩石灰土基层结冰温度的影响,将合肥—淮南高速公路田家庵段两侧土样配成掺灰比为3%的石灰土,分别在含水率为8%,11%,14%,17%与含盐量为0.5%,1.5%,2.5%,3.5%条件下进行结冰温度与无侧限抗压强度试验,分析得出了基于含盐量、含水率为变量的无侧限抗压强度与结冰温度预报方程。结果表明:不同含水率石灰土的无侧限抗压强度随含盐量增加近似成二次多项式函数模型减小;不同含水率石灰土的结冰温度随含盐量增加近似成线性函数模型增长;含盐量为1.5%~1.9%,含水率为13.5%~14.5%,结冰温度较素石灰土明显降低,满足无侧限抗压强度规范要求。
In order to study the effect of salt content on the icing temperature of the ground limestone soil in the high-grade highway shoulder, the soil samples on both sides of Tianjia’an section of Hefei-Huainan Expressway were mixed with 3% limestone soil with moisture content of 8 Freezing temperature and unconfined compressive strength under the conditions of salt content of 0.5%, 1.5%, 2.5% and 3.5%, the results of the tests based on salt content, Water content is the variable unconfined compressive strength and icing temperature prediction equation. The results show that the unconfined compressive strength of lime-soil with different water content decreases with the increase of salinity, and decreases as the second-order polynomial function model. The icing temperature of lime-soil with different water content increases with the increase of salinity, ; Salt content of 1.5% to 1.9%, moisture content of 13.5% to 14.5%, freezing temperature significantly lower than plain limestone to meet the unconfined compressive strength specifications.