Previous studies have demonstrated that saturated normally consolidated and lightly over‐consolidated clays undergo contraction when heated due to a reduction in preconsolidation pressure. A linear constitutive model is proposed to describe the thermal contraction, with this model, governing equations are developed for the coupled thermo‐hydro‐mechanical (THM) consolidation induced by a prefabricated vertical thermo‐drain (PVTD). Corresponding semi‐analytical solutions are derived employing the Laplace transform and validated via comparison with experimental results, existing numerical model, and custom finite element method (FEM) model. Subsequently, comprehensive parametric analyses are carried out to investigate the THM coupling consolidation behaviors of the clays. Outcomes show that aside from surcharge load, generation of excess pore water pressure in soils can also be induced by thermal contraction, difference in thermal expansibility between pore water and soil grains, and thermo‐osmosis, where the influence of thermal contraction on the excess pore water pressure is the most prominent among the three factors.

中文翻译：

---

考虑热收缩的PVTD改进饱和粘土THM耦合固结半解析模型

先前的研究表明，饱和的正常固结和轻度超固结粘土在加热时会由于预固结压力的降低而发生收缩。提出了一个线性本构模型来描述热收缩，利用该模型，开发了预制垂直热排水管（PVTD）引起的热-水-机械耦合（THM）固结的控制方程。采用拉普拉斯变换导出相应的半解析解，并通过与实验结果、现有数值模型和定制有限元法 (FEM) 模型的比较进行验证。随后，进行了全面的参数分析来研究粘土的 THM 耦合固结行为。结果表明，除了超载之外，热收缩、孔隙水与土粒之间的热膨胀系数差异以及热渗透也会引起土体中超孔隙水压力的产生，其中热收缩对超孔隙水压力的影响水压是这三个因素中最突出的。