软土地基处理过程中搅拌桩下沉的机理和判别方法

针对江苏某高速公路软土地基处理过程中的水泥搅拌桩下沉现象,通过现场测量桩周土中的超静孔隙水压力、土压力和剪切强度等,分析搅拌桩下沉机理,提出搅拌桩下沉的判别方法。超静孔隙水压力和土压力的现场测试结果表明,在搅拌桩下沉处,桩周土中的超静孔隙水压力大于土压力,桩周土出现了类似于液化的现象,可以以此作为搅拌桩下沉的判别方法。

Mechanisms and identification methods of sinking of mixing piles during process of soft soil foundation treatment

Sinking of cement mixing piles has occurred in the treatment process of the soft soil foundation of an expressway in Jiangsu Province. Based on field data of the excess pore water pressure, earth pressure, and shear strength of the soil around piles, the mechanisms of the sinking of the mixing piles were analyzed, and methods for identifying the sinking are proposed. The field survey results show that the excess pore water pressure was larger than the earth pressure, and a phenomenon similar to liquefaction occurred in the soil around the piles when sinking occurred. This can be used as the identification criterion of the sinking of mixing piles.