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在水中或在陆上不排水出土下沉方法建造深埋基础或地下构筑物的沉井,其施工下沉过程中通常是开底和无盖的,此时井筒结构主要承受井壁的水,土压力。水、土压力对井筒在水平面上一般是径向等值匀布,在竖向则按三角形分布,由筒顶向下增大,至筒底达最大值。多年来国内、外已经长期习用的沉井结构内力计算方法大都对井筒截取单位高度简化为平面框架或环状结构,笔者也曾对各种异形平面井筒的静力计算予以论述和推导,并制定部份应用表格,供实际计算时查表使用。应当指出,把井筒简化为平面结构计算,仍然符合沉井下沉直到封底前的施工阶段实际受力状态,也是必不可少的计算步骤。
In the water or onshore undrained soil subsidence sinking methods to build deep foundation or underground structures caisson, the construction of the sinking process is usually open bottom and no cover, this time the main borehole structure borehole water, soil pressure. Water and earth pressure on the horizontal plane is generally equal to the radial uniform, in the vertical distribution by the triangle, down from the top of the cylinder to the bottom of the cylinder up to the maximum. Over the years, both domestic and overseas long-term calculation methods of caisson internal forces have long been simplified to plane frames or ring structures for wellbore interception units. The author also discussed and deduced the static calculations of various shaped flat shafts and formulated Part of the application form for the actual calculation of the table lookup. It should be pointed out that simplifying the wellbore to calculate the plane structure still meets the actual stress conditions during the caisson sinking to the construction stage before the backseat and is also an essential calculation step.