当前位置: X-MOL 学术Acta Geotech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Thermo-poro-mechanics under adsorption applied to the anomalous thermal pressurization of water in undrained clays
Acta Geotechnica ( IF 5.7 ) Pub Date : 2021-04-10 , DOI: 10.1007/s11440-021-01188-8
Laurent Brochard , Túlio Honório

Pore fluid pressurization, one of the main causes of soil instability, is known to be anomalously high for interstitial water in clay submitted to undrained heating. This anomaly is attributed to the confinement of water in nanometric micropores. In this work, we use molecular simulation to investigate how confinement affects the thermo-mechanical properties of water and we use a new poromechanical formulation (Laurent and Túlio in Int J Eng Sci 152:103296, 2020) to relate these confined properties to the macroscopic pressurization of water during undrained heating. This new formulation considers the effects of confinement on the thermo-mechanical moduli of water in micropores, and, in particular, it accounts for the break of extensivity with respect to the volume (Gibbs–Duhem equation not valid). The predictions regarding water thermal pressurization are consistent with the available experimental data when considering a double porosity medium (micro- and macro-pores) with osmotic equilibrium between the porosities. It suggests that the excess fluid pressurization arises from the drainage of water from the micro-porosity to the macro-porosity. The proposed poromechanics offers the first quantitative thermo-hydro-mechanical description of clay based on the physics of adsorption with wide perspectives for applications and transposition to other adsorption-sensitive materials (cement-based materials, wood, bones, microporous carbons etc.).



中文翻译:

吸附作用下的热-孔隙力学在不排水黏土中对水的异常热加压中的应用

众所周知,孔隙液加压是土壤不稳定性的主要原因之一,对于不排水加热的粘土中的间隙水异常高。该异常归因于水在纳米微孔中的封闭。在这项工作中,我们使用分子模拟来研究限制如何影响水的热机械性能,并且我们使用新的poromechanical公式(Laurent和Túlioin Int J Eng Sci 152:103296,2020)将这些限制属性与宏观联系起来。在不排水的加热过程中给水加压。这种新的公式考虑了约束作用对微孔中水的热机械模量的影响,尤其是考虑了相对于体积的伸长率断裂(Gibbs-Duhem方程无效)。当考虑在孔隙之间具有渗透平衡的双重孔隙介质(微孔和大孔)时,有关水热加压的预测与可用的实验数据一致。这表明多余的流体增压来自于水从微孔向大孔的排泄。拟议的岩石力学提供了基于吸附物理学的粘土的第一个定量的热-水-力学描述,具有广阔的应用前景,并可以转移到其他对吸附敏感的材料(水泥基材料,木材,骨头,微孔碳等)上。这表明多余的流体增压来自于水从微孔向大孔的排泄。拟议的岩石力学提供了基于吸附物理学的粘土的第一个定量的热-水-力学描述,具有广阔的应用前景,并可以转移到其他对吸附敏感的材料(水泥基材料,木材,骨头,微孔碳等)上。这表明多余的流体增压来自于水从微孔向大孔的排泄。拟议的岩石力学提供了基于吸附物理学的粘土的第一个定量的热-水-力学描述,具有广阔的应用前景,并可以转移到其他对吸附敏感的材料(水泥基材料,木材,骨头,微孔碳等)上。

更新日期:2021-04-11
down
wechat
bug