港口工程打入桩桩基参数取值的探讨

Discussion on value of driven pile foundation parameters in harbor engineering

港口工程桩基规范2012版关于打入桩桩基参数(q_f、q_R)表较1998版其土层深度加深至50 m或55 m以上,但加深后不少区段参数未见提高。从岩土工程师角度,对处于欠固结状态、正常固结状态和超固结状态下的各种类型土进行分析。探讨欠固结土(尤其是淤泥)在本规范中存在的必要性;在分析各种土的岩土工程特征差异的基础上,比较多种规范数据后提出正常固结土提升q_f、q_R值的余地及超固结状态的硬土、粉性土和粉(细)砂等细碎屑土存在较大提高q_f、q_R值的可能。同时,对规范中打入桩q_f、q_R推荐值表的编制思路提出建议。

Compared with the 1998 version, the 2012 version of Code for Pile Foundation of Harbor Engineering changes the soil depth parameters which are in the driven pile foundation parameters （qf, qR） table, and to 50 m or 55 m above, but the parameters of many sections are not improved after deepening. From the perspective of geotechnical engineers, various types of soils in under-consolidated state, normal consolidation state and over- consolidated state are analyzed and discussed respectively. This paper discusses the necessity of the existence of under-consolidated soil （especially sludge） in this code. Based on the analysis of the difference of geotechnical engineering characteristics of various soils and combining with the comparison of a variety of normative data, the paper puts forward the following suggestions. First of all, the normal consolidation soil can increase the qf ＆ qR values.Secondly, in the over-consolidated hard soil, （fine） sand and other fine debris soils have a greater increase in qf ＆ qR value of the possibility.At the same time, suggestions are put forward for compiling the recommended values of qf and q R in the code.