强夯法在湿陷性黄土地基处理中的应用

Application of Dynamic Compaction Method in Collapsible Loess Foundation Treatment

湿陷性黄土的土质较为均匀,结构呈疏松状态,内部孔隙发育明显,具有突出的结构性特征。处于干燥状态的黄土一般具有较高强度,因而压缩性相对较低;而遇水后在自重应力和上覆附加应力的共同作用下将使土体结构遭到破坏,土骨架崩塌而使土体强度急剧降低,进而产生较大的沉降变形。因而,在湿陷性黄土地基施工需结合建(构)筑物的重要性、地下水位置及降雨等特点,根据其对总沉降和不均匀沉降的允许程度,采取合理的方法对湿陷性黄土进行处置,以改善其湿陷性,提高地基承载能力,降低黄土湿陷对建(构)筑物的不利影响。

Collapsible loess soil is relatively uniform,the structure is loose,and the internal pores are obviously developed,which has prominent structural characteristics.Loess in dry state generally has high strength,so the compressibility is relatively low;and under the combined action of self-weight stress and overlying additional stress after encountering water,the soil structure will be destroyed,and the soil skeleton will collapse,resulting in a sharp decrease in soil strength,thus resulting in a large settlement deformation.Therefore,in the construction of collapsible loess foundation,it is necessary to combine the importance of buildings,groundwater location and rainfall characteristics,according to the allowable degree of total settlement and uneven settlement,take reasonable methods to dispose collapsible loess,in order to improve its collapsibility,improve the foundation bearing capacity and reduce the adverse effect of loess collapsibility on buildings.