水泥土三维搅拌桩加固深厚淤土堤基强度指标变化规律探讨  

Discussion on variation law of strength index of cement-soil three-dimensional mixing pile in deep silt embankment foundation

作　　者：别烨 王碧玉 BIE Ye;WANG Biyu(Yangzhou Sushui Engineering Consulting Co.,Ltd.,Yangzhou 225127,China)

机构地区：[1]扬州苏水工程咨询有限公司,江苏扬州225127

出　　处：《江苏水利》2024年第11期43-47,共5页Jiangsu Water Resources

摘　　要：针对深厚淤土堤基中常规水泥土搅拌桩搅拌不充分、混合不均匀等问题,研发了一种三维搅拌钻头,开展三维水泥土搅拌桩成桩工艺现场试验,通过桩身芯样无侧限抗压强度及直接剪切试验得出桩体强度指标;并与传统搅拌桩强度指标变化进行对比分析,研究其变化规律。结果表明:三维搅拌桩不同深度的无侧限抗压强度、直剪强度等指标优于常规水泥土搅拌。同时,根据对比分析,桩体芯样的内黏聚力随无侧限抗压强度的增加而增加,二者整体呈线性关系。Aiming at the problems of insufficient mixing and uneven mixing of conventional cement-soil mixing piles in deep silt embankment foundation,a three-dimensional mixing drill bit was developed,and the field test of three-dimensional cement-soil mixing pile forming process was carried out.The strength index of pile body was obtained by unconfined compressive strength and direct shear test of pile core sample.Compared with the change of strength index of traditional mixing pile,the change rule is studied.The results show that the unconfined compressive strength and direct shear strength of the three-dimensional mixing pile at different depths are better than those of the conventional cement-soil mixing.At the same time,according to the comparative analysis,the internal cohesion C of the pile core sample increases with the increase of the unconfined compressive strength,and the two have an overall linear relationship.

关 键 词：三维搅拌桩 水泥土搅拌桩 深厚淤土 无侧限抗压强度 直剪强度 

分 类 号：TU473.1[建筑科学—结构工程]