Traffic loads induce cyclic loading under influence of environmental factors, and is affected by the variation of moisture content and suction (s). These parameters are difficult to quantify, and the methods for determination are cumbersome. This paper presents extensive experimental studies used to obtain the resilient modulus-suction (M_R-s) relationship of the treated subgrade soil. An optimum design of bentonite‑magnesium-alkalinization (BMA) was used an additive. The cyclic Triaxial frame with ELDYN system was employed to measure M_R values and the suction was estimated using the filter paper test. A bimodal soil water characteristic curve (SWCC) was observed for treated soil with unheated BMA additive and pre-treatment at heated (BMAH) conditions due to the presence of cementitious products. The M_R-s relationship was also developed for the stabilized soil using a normalized model. Results showed that the BMAH samples had a significant level of improvement of M_R at higher suction levels as compared to BMA samples but this behaviour of BMAH didn't sustain under fully saturated condition. The change in moisture contents under seasonal variation affects the subgrade performance. This study shows the soil additive can effectively improve the mechanical properties of the soil under various moisture contents. The M_R for the treated soil can be estimated using the normalized model under the worst-case scenario of a subgrade when the soil is at a fully saturated condition

交通负荷在环境因素的影响下会引起周期性负荷，并且会受到水分含量和吸力变化的影响。这些参数难以量化，并且确定方法繁琐。本文介绍了广泛的实验研究，用于获得处理后的路基土的弹性模量-吸力（M _R -s）关系。膨润土-镁-碱化（BMA）的最佳设计用作添加剂。采用ELDYN系统的循环三轴框架测量M _R。值和吸力用滤纸测试估计。对于未加热的BMA添加剂处理过的土壤，由于存在胶结产物，在加热（BMAH）条件下进行了预处理，观察到了双峰土壤水特征曲线（SWCC）。还使用归一化模型为稳定的土壤建立了M _R -s关系。结果表明，与BMA样品相比，BMAH样品在较高的吸力水平下具有显着的M _R改善水平，但是BMAH的这种行为在完全饱和的条件下无法维持。季节性变化下水分含量的变化会影响路基性能。这项研究表明，土壤添加剂可以有效地改善土壤在各种水分含量下的力学性能。他们当土壤处于完全饱和条件下时，可以使用归一化模型在路基最坏情况下估计处理后土壤的_R