脆性孔隙介质内的结晶应力  

Crystallization stresses in brittle porous media

作　　者：琚晓冬[1] 冯文娟[1] 张玉军[2] 赵洪波[1] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《岩土工程学报》2016年第7期1246-1253,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51379201);河南省高校科技创新团队支持计划资助项目(15IRTSTHN029);河南省高校重点科研项目(15A560023);河南理工大学博士基金项目(72103/001/096)

摘　　要：盐、水在岩石类脆性介质孔隙内结晶并对壁面产生的结晶压力作用是宏观上介质风化、冻融破坏形成的重要因素之一。将真实介质内的孔隙系统简化为各自相互贯通的理想球体、圆柱体、椭圆柱体及椭球体,并结合孔隙数量(体积)与孔径间的数学统计分布关系,提出了4种非均匀孔隙系统模型。在此基础上结合准平衡状态下非均匀孔隙系统的结晶规律、理想形态孔隙结晶压力理论及孔隙结晶应力的均化算法,推导了结晶过程中这四类模型的宏观"均化应力"计算方法和公式。以非均匀球状孔隙系统内NaCl结晶为例,探讨了宏观三向"均化应力"随结晶入侵半径(对应于孔隙溶液浓度)变化的发展演化规律。The pore wall stress from crystallization of salts or water in rock materials is an important factor to induce weathering and freeze-thaw damage. The pore system of authentic materials is generalized into four kinds of interpenetrating independently ideal shapes as sphere, cylinder, ellipsoid and elliptic-cylinder. Then four types of heterogeneous pore system models are proposed based on the statistical distribution of quantity/volume of pores to their radii. Associated with the crystallization law of heterogeneous pore system, the theory of ideal shape pore crystallization stress and the average algorithm of crystallization stresses, the computing method and formulas for macro-level“average stress” derived from micro-level pore wall stresses of these four models are proposed. Finally, based on the crystallization progress of sodium chloride in heterogeneous spherical pore system, the evolution of macro-level triaxial“average stress” with invasionradius （corresponding to solution concentration of pore system） is discussed.

关 键 词：脆性孔隙介质 孔隙系统 结晶压力 均化应力 

分 类 号：TU45[建筑科学—岩土工程]