粉喷桩处理黄土沟壑区湿软地基的试验研究

Test Research on Application of Dry Jet Mixing Pile (DJMP) in Soft Soil Foundation in Loess Ravine Region

粉喷桩复合地基加固技术作为一种成功的加固方法已在许多软土地区广泛应用,但涉及到黄土沟壑区湿软地基处理的研究较少。以陕北黄土沟壑区某公路为实例,进行粉喷桩复合地基载荷现场试验,并对加固前后地基土体的变形和强度进行对比分析。得到了地基承载力、桩间土承载力折减系数、桩土应力比、变形模量等有关参数。采用粉喷桩加固处理黄土沟壑区的湿软地基,可以提高软土地基的变形模量,从而较大程度的减小路基沉降,提高路基的整体稳定性。

As a successful method, the dry jet mixing pile （DJMP） has been widely used to treat the soft soil foundation in many areas. Here, taking the construction of a certain highway in a loess ravine region for example, the field loading test is made for the composite foundation with DJMP, and the deformation and strength of the soil masses in the foundation before and after rein- forcing are compared and analyzed, at hast, some parameters are obtained, such as the foundation bearing capacity, the reducing coefficient of the soil bearing capacity between the piles, the stress ratio between the piles and soil, the deformation modulus and so on. The results show that this method could increase the deformation modulus, decrease the settlement and strengthen the stability of soft soil foundations.