摘要
本文通过理论分析、模拟试验和现场试验对务扩桩在第四纪土层中的应用进行了研究，建立了扩大头计算公式，确定了在老粘土、破土和淤泥类土层中夯扩时扩大头形状及桩管进入持力层深度的最佳值，并据模拟试验结果提出了扩大头计算公式中的修正系数α，经工程实践，模拟试验与现场实测，结果基本吻合。这些成果对拓宽夯扩性在第四纪土层中的应用有着非常重要的意义。
By way of theory analysis, model test and field test, this paper has studied the application of ramming-reamed pile to Quaternary soil strata, established the caculation formula of the enlarged bases, separately determined the shapes of the enlarged bases and the best depths of the pile pipes entering the bearing stratum under conditions of ramming reamming in the ancient deposited cohesive soil, sandy soil and sludgy soil strata, and put forward the correction coefficient in the caculation formula of enlarged base according to the results of the medol tests. It has been found that engineering practices,model tests and field observations have basically identical results. These achievments have very important significance for widening the application of ramming-remed pile to Quaternary soil strata.
关键词
第四纪土层
务扩桩
理论分析
模拟试验
现场试验
扩大头
Quaternary soil strata ramming-reamed pile theory analysis model test field test enlarged base correction coefficient
