不同加载方式对试桩性状的影响分析

Effect Analysis of Different Loading Methods on Pile Body

依托于国家自然科学基金与实际项目数据,以FLAC^(3D)为基础模拟了3种试桩方式。着重研究了它们之间的相互关系,尤其是沉降方面,填补了国内相关方面的空白,同样还克服了实验室试验不能良好地模拟超长桩的问题。最后得到以下结论:对于桩顶沉降,无锚桩与有锚桩的曲线相差不大,平台试桩存在初始沉降量。而桩底沉降则表现为,有锚桩和平台试桩回弹率低,同样平台试桩还存在相当大的初始沉降量。对于桩身压缩量,3条曲线相似度较大。对于桩身轴力,在最大一级荷载下,锚桩和平台试桩最为相似。

According to the engineering example,the paper uses FLAC^(3D) to simulate three kinds of test piles. This paper focuses on the relationship among them,especially the settlement,it fills the gaps in the domestic related aspects,and also overcomes the problem of laboratory tests which can not be well simulated long pile. Finally we get the following conclusions: There is no difference between the curve of the pile head of the non anchor pile and the anchor pile. The pile of loading platform have initial settlement. To the settlement of pile bottom,the rebound rate of anchor piles and the pile of loading platform are small,the pile of loading platform have initial compression. To the compression of pile body,three kinds of pile are similar. To the axial force of pile,at the maximum load level,the anchor pile and the pile of loading platform are similar.