理清环境效应下固化石油污染土力学性能及污染物迁移扩散演变历程是推进污染土工程再利用的关键前提。选择石灰和粉煤灰为固化材料，结合淋滤试验和COMSOL Multiphysics软件，通过滤后界面含油量分布评价淋滤环境下固化作用对石油迁移的控制性，以土体界面强度和变形的演变为指标评价淋滤环境下固化污染土的力学稳定性。研究结果表明：石灰粉煤灰固化可解决污染土在淋滤作用下存在的污染物迁移扩散甚至大量迁出问题，实现对土中石油污染物迁移的良好控制。淋滤作用下固化污染土的界面含油量始终接近于初始设定状态，迁移率仅为1.35%～2.76%；淋滤作用下固化污染土的力学参数变化幅度与围压及污染物浓度正相关，但都仅在初始受力的10 s内存在波动随后强度值稳定在5.77×104~6.07×104 N/m2，位移最大波动值为1.73×10-3~6.46×10-2 mm。固化污染土的力学稳定性良好，安全系数（Fs）达10以上。石灰粉煤灰固化石油污染土可同时兼顾环境和工程需求，具有工程再利用潜力。

Clarifying the mechanical properties of solidified oil-contaminated soil and the evolution of contaminate migration and diffusion under environmental effects is a key prerequisite for promoting the reuse of contaminated soil projects. Lime and fly ash with a low-carbon concept were selected as solidification materials, combined with the leaching test and COMSOL Multiphysics software, the control of the solidification effect on oil migration under leaching environment was evaluated macroscopically by oil content after leaching, and the mechanical stability under seepage was evaluated by soil strength and deformation. The results indicate that the solidification of lime fly ash can solve the problem of contaminant migration and diffusion or even a large number of migration under the leaching effect of contaminated soil, and achieve good control of the migration of oil contaminants in soil. The oil content at the interface of solidified contaminated soil under the action of seepage leaching is always close to the initial oil content setting state, and the change rate mobility is only 1.35 % ~ 2.76 %. The variation range of mechanical parameters of solidified contaminated soil under leaching is positively correlated with confining pressure and contaminant concentration, but only fluctuates within 10 s of initial stress and then the strength value is stable at 5.77×104 ~ 6.07×104 N / m2, and the maximum fluctuation value of displacement is 1.73×10-3 ~ 6.46×10-2 mm. The mechanical stability of solidified contaminated soil is good, and the safety factor (Fs) is more than 10. Lime fly ash solidified oil contaminated soil can take into account both environmental and engineering requirements, and has the potential for engineering reuse.

国家自然科学基金项目（No. 52278341 和 51978235），河北省自然科学基金（No.E2018202274）