Unitary Definition of Matric Suction
Unitary Definition of Matric Suction
复制标题
基质吸力的统一定义
DOI：
10.1061/(asce)gt.1943-5606.0002004
复制
发表时间：
2019
影响因子：
3.9
通讯作者：
N. Lu
中科院分区：
文献类型：
--
作者：
Chao Zhang;N. Lu
基质吸力或负基质势(单位：千帕斯卡)是单位体积水从土壤水分状态等温转变到自由水状态时的自由能变化，定义为土壤-水-空气代表基本体积(REV)[图1(A)]。基质吸力被广泛认为是控制非饱和土力学行为的最基本的物理变量，如有效应力、抗剪强度、膨胀压力、冻结点和导热系数等。然而，普遍将基质吸力(ψm)定义为毛细管负压或孔隙空气(UA)和孔隙水(UW)之间的压差仍然存在不完全的物理意义ψm 1⁄4 UA−UW？
Matric suction or negative matric potential (unit: kilopascal) is the free energy change in a unit volume of water when isothermally transferred from the soil water state to the free water state, and is defined at the soil-water-air representative elementary volume (REV) [Fig. 1(a)]. Matric suction has been widely considered as the most fundamental physical variable governing unsaturated soil behavior such as effective stress, shear strength, swelling pressure, freezing temperature depression, and thermal conductivity. Nevertheless, the prevailing definition of matric suction (ψm) as negative capillary pressure or the pressure difference between pore air (ua) and pore water (uw) still bears incomplete physics ψm 1⁄4 ua − uw ð1Þ