论文部分内容阅读
一、群桩效应通常桩的现场垂直受压静荷载试验主要目的之一是为设计提供合理的单桩承载力,大多数情况下,桩的荷载试验是以单桩形式出现的。但是,一般情况下,桩基础中的桩往往是以群桩方式采用的。群桩中基础承台-桩-土相互间的共同作用使其工作性能远比单桩来得复杂。这样,人们自然地会提出以下一些问题,诸如:静载试验确定的单桩容许承载力能否直接用于建(构)筑物群桩基础中的单桩,静载试验的单桩容许下沉量与群桩基础的下沉量有多大差别,单桩与群桩在荷载传递机理上有些什么差别,承台的作用如何,对不同类型的群桩基础应如何设置最优桩距,影响群桩的主要因素有哪些,等等。国内外关于群桩工作性能的研究甚少,这不仅是由于群桩的现场原型试验要比单桩困难得多,而且
1. Pile group effect One of the main purposes of the vertical static load test of a pile in situ is to provide a reasonable design for the bearing capacity of a single pile. In most cases, the load test of a pile occurs in the form of a single pile. However, in general, piles in pile foundations are often used in piles. The common functions of foundation piles, piles and soils in group piles make their working performance far more complex than that of single piles. In this way, people naturally raise the following questions, such as: whether the allowable bearing capacity of a single pile determined by the static load test can be directly used for a single pile in a pile foundation of a building (structure), and the single pile of a static load test is acceptable. What is the difference between the sinking capacity and the sinking capacity of the pile group foundation? What is the difference in the load transfer mechanism between the single pile and the pile group? How is the capping effect? How to set the optimal pile spacing for different types of pile grouping? What are the main factors of the pile group, and so on. There is very little research at home and abroad on the performance of group piles. This is not only because the field prototype tests of group piles are much more difficult than single piles, but also