西南地区淤泥质软土工程特性分析

软土地基其特点主要表现为承载力低, 变形大, 特别是不均匀变形大, 且变形稳定时间可长达几年甚至几十年。当桥址处地基为软土时, 建成后, 桥基、台背路基等处不均匀沉降显著, 并造成结构开裂破坏、倾斜。因此, 笔者选择了西南地区桥址地基为软土的某立交桥作为研究对象, 对重点研究区域进行详细地质勘查, 对软土区的土体物理力学性质以及矿物化学成分进行了测定, 并对其相关性进行分析, 以期获取研究区软基工程特性, 为工程实际提供有价值的参考, 得出的结论及建议可推广到西南地区其他软土区道路建设的工程应用。

STUDY ON THE ENGINEERING CHARACTERISTICS OF THE MUDDY SOIL IN SOUTHWEST CHINA

Soft soil foundation is characterized mainly for low bearing capacity, large deformation, especially non-uniform deformation. The deformation stability can last for a few years or even decades. After the bridge foundation built in soft soil is completed, the place such as bridge foundation, subgrade, et al.appear significant differential settlement, and cause structural crack damage and tilt. Therefore, one overpass bridge foundation for soft soil was chosen in southwest China as the research object. The detailed geological investigation was conducted in study area. Physical and mechanical properties of the soil and the mineral and chemical composition in soft soil areas were measured and analyzed to obtain the soft foundation engineering characteristics and provide valuable reference for practical engineering. The conclusions and suggestions are expected to be applied to other road construction in soft soil district in southwest China.