Elastic behavior of saturated porous materials under undrained freezing  

作　　者：Qiang Zeng Teddy Fen-Chong Ke-Fei Li 

机构地区：[1]Civil Engineering Department,Tsinghua University [2]Universit Paris-Est,Laboratoire Navier(UMR 8205),CNRS,ENPC,IFSTTAR,2 alle Kepler,F-77420 Champs-sur-Marne,France

出　　处：《Acta Mechanica Sinica》2013年第6期827-835,共9页力学学报（英文版）

基　　金：supported by the National Basic Research Program of China(2009CB623106);the National Science Foundation for Post-doctoral Scientists of China(2012M520288)

摘　　要：The elastic behavior of saturated porous materi- als under undrained freezing is investigated by using a poro- mechanical approach. Thermodynamic equilibria are used to describe the crystallization process of the partially frozen solution in bulk state and confined state in pores. By phase transition at freezing, fusion energy, thermal contraction of solid, solution and ice crystals, volume changes of crystallization build up remarkable pore pressure that induces expansion or shrinkage of solid matrix. Owing to the lower chemical potential when pore water mixes with salts, fewer ice forms in pores. Penetration of ice into the porous materials increases the capillary pressure, but limits effect on the pore liquid pressure and the strain of solid matrix. On the contrary, the pore pressure induced by solution density rises as salt concentration increases and causes significant shrinkage of solid matrix.The elastic behavior of saturated porous materi- als under undrained freezing is investigated by using a poro- mechanical approach. Thermodynamic equilibria are used to describe the crystallization process of the partially frozen solution in bulk state and confined state in pores. By phase transition at freezing, fusion energy, thermal contraction of solid, solution and ice crystals, volume changes of crystallization build up remarkable pore pressure that induces expansion or shrinkage of solid matrix. Owing to the lower chemical potential when pore water mixes with salts, fewer ice forms in pores. Penetration of ice into the porous materials increases the capillary pressure, but limits effect on the pore liquid pressure and the strain of solid matrix. On the contrary, the pore pressure induced by solution density rises as salt concentration increases and causes significant shrinkage of solid matrix.

关 键 词：POROMECHANICS CRYSTALLIZATION CEMENT Salt solution 

分 类 号：TB383.4[一般工业技术—材料科学与工程]