含软土夹层地基高压旋喷桩加固方法研究  

The Research Method of High Pressure Jet Grouting Pile Reinforces Soft Interlayer Soil

作　　者：朱振生[1] 沈扬[1] 汪磊 丁选明[1] 朱敏 朱颖浩 

机构地区：[1]河海大学岩土工程科学研究所,南京210098 [2]中铁时代建筑设计院有限公司,芜湖241001

出　　处：《科学技术与工程》2015年第35期64-69,86,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51420105013)资助

摘　　要：含软土夹层地基,用高压旋喷桩仅加固中间软土夹层,不仅可以提高软土地基承载力,相对于传统的桩基加固方法也降低了造价。结合芜湖高压旋喷桩加固软土夹层工程项目,提出了含软土夹层地基高压旋喷桩加固方法,进行了不同位置、不同掺入比、不同龄期下的水泥土的无侧限抗压强度试验和压缩试验,通过对比分析得到合理的掺入比,并得到试件90 d后的无侧限抗压强度和压缩模量。通过理论计算分析了各层土的应力,计算了各层土的沉降,结果表明含软土夹层地基采用高压旋喷桩加固后地基的强度和沉降量均满足设计要求。High pressure jet grouting pile only reinforces soft interlayer soil of this foundation that contains soft clay interlayer. This not only can improve the bearing capacity of soft soil foundation,but also reduces the cost compared to traditional pile foundation reinforcement method. In combination with the high pressure jet grouting pile reinforcing soft clay interlayer in Wuhu project,with the method of high pressure jet grouting pile reinforces soft interlayer soil were put forward and the unconfined compressive strength test and compression test of cementtreated soil in different positions,different mixing ratio and different ages were made. Through the comparative analysis,reasonable cement mixing ratio and predict unconfined compressive strength and compression modulus of the specimen after 90 days were gotten. The stress of the soil layer through theoretical method was analyzed,and the subsidence of the layers of soil were calculated. The results show that strength and settlement of this foundation of high pressure jet grouting pile reinforces soft interlayer soil meet the design requirements.

关 键 词：高压旋喷桩 承载力 沉降 理论分析 软土夹层 

分 类 号：TU473.11[建筑科学—结构工程]