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福州位于我国东南沿海的闽江入海口,市区大部分地基为海成溺谷相沉积软土,淤泥埋藏很浅,其上只有1—2m厚的可塑性粘土表土层,池塘、河滨比比皆是,地层结构遭到破坏。第一层淤泥的厚度为5—15m,这层淤泥几乎遍布整个福州盆地,经探明,个别地区淤泥的最大深度超过50m。由于淤泥层分布广,埋藏浅、厚度大,故浅埋基础很难满足高大建筑物的要求。近年来,大直径冲(钻)孔灌注桩在我省迅速发展,为探讨这类桩的荷载传递性能,自1986年以来,福建省建研所结合具体工程的桩基静荷载试验,有目的地在试桩中预埋测试原件,获得了一些足尺试桩资料。
Fuzhou is located at the mouth of the Lancang River in the southeastern coast of China. Most of the urban area is submarine-laden soft clay. The silt is buried very shallow. There is only a 1-2m thick layer of clay on the clay surface. The ponds and riverfront are bubbling. Yes, the structure of the ground was damaged. The thickness of the first layer of silt is 5-15m. This layer of silt is almost distributed throughout the entire Fuzhou Basin. It has been proved that the maximum depth of silt in individual areas exceeds 50m. Due to the wide distribution of silt layers, shallow burial, and large thickness, it is difficult for shallow buried foundations to meet the requirements of tall buildings. In recent years, large-diameter punching (drilling) bored piles have developed rapidly in our province. To investigate the load transfer performance of these piles, since 1986, the Fujian Provincial Institute of Research and Development has used concrete piles to test the static load of pile foundations. The original test pieces were embedded in the test piles and some full-scale test pile data were obtained.