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一、砂泥岩层中裂隙发育的规律 在陕西北山地区砂泥岩层主要为石炭—三叠系的陆相碎屑岩沉积,砂、泥岩交互成层,但各层组的砂、泥岩比率则很不一致,它们除在局部的低山丘陵和河谷地带出露于地表外,普遍上复60—80米的黄土。在地貌类型上主要为呈北东东向展布的黄土台塬,受河流、沟谷的贯穿,塬面多被切割成大小不等
First, the development of fractures in sandstone and mudstone The sand and mudstone in the Beishan area of Shaanxi is mainly composed of Permian-Triassic terrigenous clastic sediments. Sand and mudstone are interbedded. However, the ratio of sand and mudstone in each layer is very high Inconsistent, apart from being exposed to the earth’s surface by local hilly and valley areas, they generally recover loess of 60-80 meters. In the type of landform, it mainly consists of loess plateau distributed in the north-east direction and eastward, which is traversed by rivers and valleys. The plateau areas are mostly cut into different sizes