关键词: 水泥土搅拌桩, 桩身质量, 电阻率, 无侧限抗压强度, 搅拌均匀性

Abstract: Through analyzing of the unconfined compressive strength and electrical resistivity of the cement-soil core samples from a test site of T-shaped bidirectional cement-soil deep mixing columns, some conclusions are drawn as follows. The quality of the cement-soil deep mixing column body is closely related to its construction technology. Under a certain kind of construction technology, the cement mixing ratio and cement-soil mixing homogeneity are two important factors effecting the column body quality. The vertical electrical resistivity of a core sample at any given depth is higher than its horizontal electrical resistivity. There exists a good linear relationship between the unconfined compressive strength and electrical resistivity; so the strength of the core samples can be evaluated from their electrical resistivity. The standard deviation of horizontal electrical resistivity can be used to analyze the cement mixing ratio and cement-soil mixing homogeneity. Therefore, the quantitative analysis of the column body through electrical resistivity and related index of cement-soil under the condition of large-scale column construction is an economic, nondestructive, simple and scientific detection method.

Key words: cement-soil deep mixing column, column body quality, electrical resistivity, unconfined compressive strength, mixing homogeneity