建筑岩土地基强度的影响因素分析
2012-10-15蓝秋容
蓝秋容
摘要:伴随着人类社会的几何式发展,建筑的高度越来越高。高层建筑与其他建筑最大的不同就在于垂直面荷载密集,并由于建筑物竖向不稳定性,导致受风荷载与地震荷载的影响十分巨大,这无疑对建筑岩土地基的处理技术提出了更高的要求。笔者结合自身经验,由内而外地分析了影响高层建筑岩土地基强度的因素,希望通过文中内容能够给岩土地基处理技术带来一定的启示作用,也为有效提高建筑工程质量提供理论参考。
关键词:岩土工程;地基强度;影响因素
Abstract: with the development of human society geometric type, the height of the building more and more high. High-rise building and other building the biggest difference lies in intensive vertical load, and due to the stability of the vertical buildings, lead to be wind load and the influence of the seismic load is very great, no doubt on the building foundation processing technology of geotechnical put forward higher request. Based on their own experience, from inside to outside analyzes the impact of high-rise building foundation intensity factors of geotechnical, hope that through the content can give geotechnical foundation treatment technology bring the certain enlightenment function, also to effectively improve the construction engineering quality to provide theoretical reference.
Keywords: geotechnical engineering; The foundation strength; Influence factors
中圖分类号:TU471.6文献标识码:A文章编号:
1建筑岩土地基强度的内部影响因素
1.1 地基刚度的影响
众所周知,我们在分析岩土共同作用时通常要考虑到地基土的特征值。理论上来说,如果地基越来越软,那么基础内力也会随之增大,基础相对挠曲也是如此;当地基刚度增加到一定程度后,由于建筑物上部结构刚度达到相对饱和,对基础内力很难产生重要影响,建筑物沉降值已经非常小了,这时候建筑的不均匀沉降与上部结构的关系就微乎其微了,结建筑物各构件间的相互作用己很难得到应有发挥,也就是说建筑上部结构的次应力也就可以忽略不计了。可见建筑物在软弱地基上要比在坚硬地基上,考虑共同作用分析无疑是更为重要的。由于建筑物的不均匀沉降与地基刚度变化有很大关系,所以说从在地基刚度减小时,建筑物的内部结构卸载,而边部纵向受力结构加载,这种现象又因为建筑上部结构刚度增加而越演越剧。……