黄土湿陷性的微结构不平衡吸力成因论  

SYNTHETIC EFFECT OF MICROSTRUCTURE AND UNEVEN SUCTION ON LOESS SUBSIDENCE

作　　者：汤连生[1] 

机构地区：[1]中山大学地球与环境科学学院地球科学系,广州510275

出　　处：《工程地质学报》2003年第1期30-35,共6页Journal of Engineering Geology

基　　金：国家自然科学基金 (批准号 :5 0 2 790 5 6;5 97790 19);广东省自然科学基金 (批准号 :970 12 7)资助项目

摘　　要：分析了黄土粒间吸力的基本特性及其湿陷的微观过程 ,探讨了黄土在应力状态作用下由于浸水增湿而产生的微结构单元体滑移动力和阻力随饱和度、上覆土压力的变化规律 ,提出了微结构与广义吸力综合效应的湿陷性控制机理———微结构不平衡吸力成因论及其定量模型 ,从理论上分析了湿陷性与增湿水量、压力及深度的关系 ,揭示了土湿陷效应的内在规律。文中认为 ,湿陷过程就是水的楔入导致小孔隙广义吸力的逐渐丧失和大孔隙湿吸力的逐渐增大引起的微结构重建动力与重建阻力间的动态对抗过程。最后 ,讨论了湿陷的基本条件及影响因素。Based on analyzing the property of suction between loess grains and the micro-process of loess subsidence, the relation between the motive force or resistance for sliding of microstructural units with water content and soil pressure are discussed. A theory of synthetic effect of microstructure and generalized suction on the formation of loess subsidence is put forward. The relations between loess subsidence with water content , pressure or depth of soils are theoratically analyzed, and the inherent regularity of loess subsidence is open out. The motive force and resistance for structural reconstruction are caused by effects of gradual loss of generalized suction in small pores and gradual increase of absorption suction in larger pores after soil absorbing water. In this paper, it is thought that the process of subsidence is just a dynamic course of counteaction process between microstructre reconstructing motive force and resistance. Lastly, the basic conditions for subsidence and primary factors affecting subsidence are talked over. This study should be of theoretical significance in quantitative research of loess subsidence.

关 键 词：黄土 微结构不平衡吸力成因论 应力状态作用 土压力 湿陷性控制机理 深度 

分 类 号：TU444[建筑科学—岩土工程]