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武汉市区地形较为平坦,在较小建筑场地范围内的地面标高度化更加小,一般在1.00m~1.30m之间,地貌单元属长江冲积一级阶地,但是地下水位埋深较浅,多小于3.00m,且深层基岩倾斜度较大,地质结构较复杂.近年来,人工挖孔桩、钻孔灌注桩、沉管灌注桩等深基础常应用于该区多层及高层建筑桩基础设计中,尤其是钻孔灌注桩,多用于高层及超高层建筑中,其钻孔深度达60m~70m深,而施工事故时有发生.所以,急需从勘察、设计及施工等方面详细分析桩基础事故的原因,总结经验教训,以指导桩基施工.笔者曾参与几个工程的施工监理工作,现对桩基施工中的一些常见事故及处理方法作一介绍.一、施工中常见事故分析及处理方法
The topography of Wuhan is relatively flat, and the height of the ground surface within the smaller building site is even smaller, generally between 1.00m and 1.30m. The geomorphological unit belongs to the alluvial terrace of the Yangtze River, but the depth of the groundwater table is shallow. It is less than 3.00m, and the bedrock in the deep layer has a large inclination, and the geological structure is relatively complex. In recent years, deep foundations such as artificial digging piles, cast-in-place piles, and immersed tube cast-in-place piles have often been applied to multi-storey and high-rise building pile foundations in the area. In the design, especially bored cast-in-place piles, which are mostly used in high-rise and high-rise buildings, the drilling depth is 60m~70m deep, and construction accidents occur from time to time. Therefore, it is urgent to analyze piles in detail from aspects of survey, design and construction. The causes of the basic accidents, summed up the experience and lessons to guide the construction of the pile foundation. The author once participated in the construction supervision work of several projects, and now makes an introduction to some common accidents in the pile foundation construction and treatment methods. First, the analysis of common accidents in the construction And processing methods