河北平原地裂缝产生的微观机理研究  

MICRO-STRUCTURAL ANALYSIS OF THE GROUND FISSURES IN HEBEI PLAINS

作　　者：孙强[1] 杨继红[1] 秦四清[1] 刘天霸[2] 胡秀宏[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《工程地质学报》2008年第2期201-205,共5页Journal of Engineering Geology

摘　　要：分析了降雨和微结构失稳诱发的河北平原地裂缝机制。根据研究发现:(1)根据近40 a来华北平原的降雨量曲线图与地裂缝发生的时间图对比发现地裂缝多干旱年份的6-8月,地裂缝与农业灌溉用水密切相关。(2)通过微结构突变失稳理论发现当应力状态满足孔隙微结构失稳判别式时,微结构元的变形状态将产生一个"跳跃",即会诱发微结构失稳崩塌。(3)地下水的抽取造成原饱和带土体颗粒之间有效接触力的增加,同时造成地下隐裂隙和空洞的形成。同时灌溉入渗引起的非饱和带土体含水量增加,不仅改变了颗粒的受力情况,更重要的是导致了颗粒间连接刚度的降低,导致微结构的失稳。It is analysed the mechanism of ground fissure in Heibei plain. From the Fig of Normalized Z index time series of rainy season in North China, one can get that the rain is corresponding earth fissure. It is founded that ground fissure is closely contacted with the change of groundwater. When the connection rigidity reduces, the structure loses its steadily. These changes occur and complete in instantaneous, and there is always following the appearance of earth fissure.

关 键 词：地裂缝 降雨 微结构 稳定性 突变 

分 类 号：P642.26[天文地球—工程地质学]