基于十字板剪切试验的软基处理研究

Evaluation of Ground Improvement Using Vane Shear Test

以某实际工程软土地基为研究对象,采用真空预压法对软土地基进行处理,使用十字板剪切试验、室内试验分别对处理前后的软基进行分析,评价地基处理的效果,研究表明:处理前的地基力学性能较差、稳定性能差、强度低、状态为流塑性、高压缩性、厚度较大,不适宜作持力层;使用真空预压方法处理后,地基原状土抗剪强度值较处理前提升了262.5%、重塑土的抗剪强度值较处理前提升了225.3%;地基处理后的土体各项力学性能指标均有所提升、土体质量明显提升,处理后的土体适合作为建筑物地基基础。

With the development of engineering technology and the extensive distribution of new constructions,new buildings have to be constructed on soft soil where various ground improvement methos are developed.This paper presents a case history of ground improvement using vacuum preloading method.The improvement effect was measured by the vane shear test and laboratory tests before and after the ground improvement.The following results are obtained:the soft soil before the treatment has poor mechanical properties,poor stability,low strength,fluid plasticity,high compressibility,and large thickness,and is not suitable for a bearing layer;After the ground improvement,the undrained shear strength value of soil increased by 262.5%compared with that before the treatment;and the remolded undrained shear strength value increased by 225.3%.After the ground improvement,various mechanical performance indexes of the soil mass are improved,and the soil is significantly improved,the treated soil is suitable for the building foundation construction.