The soil stabilisation is employed to construct geostructures as embankments, river levees, road subbases or to backfill excavations, improving the mechanical behaviour and reducing the consumption of extracted primary aggregates. This study is focused on the use of lime/cement treated soils to backfill trenches where high power line cables are buried. Indeed, under these circumstances not only the mechanical properties but also the thermal characteristics of the treated soil are of primary importance.

The effect of changes in suction (soil water content) on the thermo-mechanical properties was investigated on lime-treated and lime-hydraulic binder treated silty soils in the laboratory. The relationship between the Soil Water Retention Curve (SWRC) determined by suction control and measurement techniques, and the thermal properties along the drying path from the Optimum Proctor point (initial state) was analysed. Moreover, to investigate the successive heating/cooling periods induced by the cable, several drying/wetting cycles were applied to analyse their effect on the thermal properties and mechanical behaviour of compacted treated soils. The obtained data showed that increasing the suction from initial state to 3.5 MPa induces a decrease in the thermal conductivity (λ), this diminution becomes more important below 3.5 MPa of suction. An inverse trend was however observed in the change of the thermal capacity (C) with increasing section. The drying/wetting cycles appeared to have a significant impact on the mechanical performances and smaller effect on the thermal properties of the studied compacted treated silty soil.

土壤稳定作用可用于建造路堤，河堤，路基等地质结构，或用于回填开挖，从而改善机械性能并减少提取的主要骨料的消耗。这项研究的重点是使用石灰/水泥处理过的土壤回填埋有大功率电缆的沟槽。确实，在这些情况下，不仅处理过的土壤的机械性能而且热学特性都至关重要。

在实验室中，研究了石灰（石灰水处理）和石灰-液压粘结剂处理的粉质土壤吸力变化（土壤含水量）对热机械性能的影响。分析了通过吸水控制和测量技术确定的土壤水分保持曲线（SWRC）与从最佳保护点（初始状态）开始沿干燥路径的热学性质之间的关系。此外，为了研究电缆引起的连续加热/冷却时间，应用了几个干燥/润湿循环来分析它们对压实处理过的土壤的热性能和机械性能的影响。获得的数据表明，将吸力从初始状态增加到3.5 MPa会导致导热系数（λ）的降低，在3.5 MPa吸力以下，这种减小变得更加重要。然而，观察到热容量（C）随截面增加而变化的相反趋势。干燥/湿润循环似乎对所研究的压实粉质土的机械性能具有显着影响，而对热性能的影响较小。