The Characteristic Analysis and Treatment Measures of Thick Collapsible Loess of the Northwestern of Shanxi Province——Take an Alumina Plant Site in Baode County of Shanxi Province as the Example
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摘要: 以山西省保德地区某大型氧化铝厂勘察工程为例,结合该地区的工程地质条件,通过对648组实验数据的整理、统计、分析研究,结果表明,该地区主要为第四系全新统(Q4)、上更新统(Q3)及中更新统(Q2)的风成及坡积堆积物,其中湿陷性黄土层厚度达15~30 m,湿陷类型为自重湿陷性,湿陷等级Ⅱ~Ⅲ级,属中等—严重湿陷性黄土场地,在天然状态和饱和状态下力学性质差异较大;普通的处理措施难以全部处理湿陷性黄土层,而采用沉管成孔、重锤二次夯扩挤密桩则能全部处理湿陷性黄土,且效果良好。Abstract: In this paper,an alumina plant site in Baode County of Shanxi Province is taken as an example.It shows that this area is mainly Quaternary Holocene(Q_4),the Pleistocene(Q_3) and the Pleistocene(Q_2) of aeolian and talus deposits,particles are mainly composed by fine sand and silt(particle size 0.25~0.01mm),by processing,counting and analyzing of 648 set of experimental data and combining with the engineering geological conditions of local.In which the thickness of loess layer is 15~30 m,collapsible type is self weight collapsible,collapsible grade is Ⅱ~Ⅲ,it is a middle-serious collapsible loess ground.The difference of the mechanical properties is great in the natural state and saturation state,therefore,the loess layer is hardly entirely cleared up by general measures.The use of immersed tube into the holes and hammer secondary Compacted Piles are ableto handle all of the loess and the effect is well.
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