摘要
前言 我国地域辽阔,红层分布较广。遍布于我国的中—新生代红层大多由陆相碎屑沉积物所组成。陆相沉积岩的特点是岩性和岩相的复杂多样,主要为交互成层的砾岩、砂岩、粉砂岩和粘土岩。粘土类岩的岩性软弱,而砂岩、砾岩、粉砂岩的岩性则较坚硬。红层的层组往往由这些软硬相间的岩层所组成,所以其工程地质条件较为复杂,特别是软弱夹层(粘土岩或页岩夹层)及其泥化层对工程建设的影响尤为突出。
The formation and structural zonation of weak interbeds and their clay-gouged intercalations in red beds under the dam foundation of Gezhouba water control project are discussed in this paper.Based on the degree of destruction caused by intrastratal dislocations,three distinct zones and a plane can be seen in a weak interbed,namely:the joint zone,the crenulated cleavage zone and the clay-gouged zone,and the clay-gouged plane.The physical properties of the three zones may also very accordingly.The clay-gouged plane with the lowest shear resistance should be regarded as the critical weak plane that may induce sliding at the shallower depths of the foundation.The physics-chemical interaction between infiltration water and clay-gouged layers is mainly represented by the lixiviation of salts and the reaction of cation exchanges,which will result in the change of physical properties and the reduction of shear strength of the clay-gouged layers.However,if infiltration-proof treatments are well done,the behaviour of the clay-gouged layers will not change apparently.
作者
戴广秀
凌泽民
石秀峰
张宁
Dai Guangxiu;Ling Zeming;Shi Xiufeng;Zhang Ning(Institute of Hydrogeology and Engineering Geology,The State Bureau of Geology)
出处
《地质学报》
1979年第2期153-166,170,共15页
Acta Geologica Sinica
