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一、前言现行“湿陷性黄土地区建筑规范”规定:桩基的侧面摩阻力仅考虑打入非湿陷性土层中的一段。按这个规定,自重湿陷性黄土和非自重温陷性黄土都不考虑侧面摩阻力。一九七二年我们在青海省大通煤矿的一项工程设计中,采用了“人工挖孔桩”基础,桩身穿过8.0米厚的二级自重温陷性黄土,支撑在中密的卵石层上。在桩基设计过程中,有些兄弟单位认为:自重湿陷性黄土对桩应有负摩阻力。由于我们缺乏在黄土地区进行建设的经验,负摩阻力又是第一次听到,因此,在建筑场地上做了两根小直径的钻孔灌注
I. INTRODUCTION The current “Construction Regulations for Collapsible Loess Areas” stipulates that the lateral friction resistance of the pile foundation should only be considered as a section of the non-collapsed soil layer. According to this regulation, side friction resistance is not taken into account for gravity collapsible loess and non-self-possessed collapsible loess. In 1972, in an engineering design of the Datong Coal Mine in Qinghai Province, we used the “manual digging pile” foundation and the pile was passed through an 8.0-meter-thick secondary self-resolving subsidence loess, supported by On the dense pebble layer. In the design process of the pile foundation, some brothers believe that the self-heavy collapsible loess should have negative friction resistance to the pile. Due to our lack of experience in the construction of loess areas, negative friction resistance was heard for the first time. Therefore, two small-diameter boreholes were drilled on the construction site.