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华北地区自中石炭纪以来,普遍接受了一套陆相沉积的碎屑岩建造,其岩性以砂岩及泥页岩为主。以山西省为例,从石炭系中统本溪组(C2b)至侏罗系中统天池河组(J2t),其堆积厚度大于3000余米。从已建或在建的工程实践来看,最早自二叠系上统上石盒子组(P2s)开始,其间发育的泥质岩夹层往往具有浸水膨胀、失水收缩的工程特性。作为建筑物的基础,如果未对其采取行之有效
Since the Carboniferous in North China, a set of continental clastic rocks has been generally accepted for its construction. Its lithology is dominated by sandstone and shale. Taking Shanxi Province as an example, from the Carboniferous Central Benxi Formation (C2b) to the Jurassic Middle Tianchihe Formation (J2t), the accumulated thickness is more than 3000 meters. According to the built or under-construction engineering practice, the mudstone interbed developed during the earliest period from Permian Upper Shihsizi Formation (P2s) often has the engineering characteristics of flooding and water loss and shrinkage. As a building foundation, if it does not work well